Article
Engineering, Manufacturing
Yachao Wang, M. Minhaj, Xinnan Wang, Jing Shi
Summary: This research explores the deformation behaviors of monocrystalline and polycrystalline silicon materials in nanoindentation using atomistic simulation approach. The study validates the molecular dynamics simulation model for nanoindentation, reveals intriguing phenomena like phase transformation and grain size effects, and observes an inverse Hall-Petch effect in the nanoindentation process of silicon.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Multidisciplinary
Quanfeng Han, Xin Yi
Summary: As the average grain size decreases, the reduction in intragranular dislocation storage ability is revealed as the underlying mechanism of the breakdown of Hall-Petch behavior in nanocrystalline (NC) metals. The prediction of the critical grain size for the HP-inverse HP transition of NC metals agrees well with experimental results, showing remarkable ductility enhancement in the inverse HP region dominated by harmonized deformation of grain boundaries and grain interior. Additionally, the increase in grain boundary strength leads to enhancement in yield strength and delay in occurrence of the inverse HP behavior in NC metals.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Nanoscience & Nanotechnology
K. A. Darling, B. C. Hornbuckle, C. J. Marvel, V. H. Hammond, K. Solanki
Summary: The paper provides a critical assessment of the role of grain size in limiting strength gains in stable nanocrystalline metals. Using copper-tantalum binary alloys, the study explores the breakdown of classical Hall-Petch behavior and its underlying mechanisms. The results show that Cu-Ta alloys exceed traditional strength limits predicted by the Hall-Petch relationship for NC Cu.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Frederic Sansoz, Xing Ke
Summary: The breakdown of grain-size strengthening to softening mechanisms in nanocrystalline alloys, particularly with regards to grain-boundary solute segregation, has been investigated through large-scale simulations. Three concentration-dependent regimes of plasticity were identified, including classical segregation strengthening, shear band-induced softening, and a previously unknown plateau of maximum strengths for intermediate solute contents. The findings highlight the complex roles of solute segregation and interfacial plasticity mechanisms in nanocrystalline alloys.
Article
Materials Science, Coatings & Films
H. S. Maharana, K. Mondal
Summary: This study successfully developed pure Ni and Ni-MoS2 bulk nano-crystalline electrodeposited coatings and analyzed their mechanical and wear behavior. The crystallite size of Ni in Ni-MoS2 coatings varied with different loading levels of MoS2, showing an inverse Hall-Petch relation in hardness values. The wear resistance of Ni-MoS2 coatings was significantly improved compared to pure Ni electrodeposit, possibly due to the higher hardness caused by dispersion hardening. The wear behavior of the Ni-MoS2 coatings was correlated with crystal orientation, coating morphology and hardness to establish a possible abrasive wear mechanism.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Mao Deng, Zhangyi Huang, Wanying Guo, Yang Shi, Junjing Duan, Jianqi Qi, Haomin Wang
Summary: Short-range order is a new strengthening effect that significantly affects the mechanical properties of high-entropy materials. Simulation results show that this effect suppresses grain size softening and leads to the disappearance of inverse Hall-Petch behavior in nano-crystalline high-entropy materials. In this study, the inverse Hall-Petch behavior is confirmed in translucent nanocrystalline high-entropy ceramic (HEC) with an average grain size below 10 nm, fabricated using a high-pressure low-temperature sintering technique. Moreover, the nanocrystalline HEC also exhibits improved fracture toughness compared to coarse-crystalline HEC.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Dinh-Quan Doan, Anh-Son Tran, Ngoc-Chien Vu
Summary: The nanoindentation response of FeCoCrNiCu high-entropy alloy was studied through molecular dynamics simulation. Various grain sizes and twin lamellae thicknesses were found to significantly affect the mechanical characteristics and plastic deformation. The study revealed an inverse Hall-Petch effect in the relationship between material strength, grain size, and twin lamellae thickness. The presence of grain boundaries and twin boundaries affected atom movement and resulted in asymmetrical dispersion of atomic displacement vectors during deformation. The results also showed that pile-up height increased with grain size and decreased with twin lamellae spacing. Microstructural evolution indicated that grain rotation and grain boundary movement were dominant mechanisms in deformation with grain size reduction. Dislocation nucleation at the intersections of twin and grain boundaries also significantly affected plastic deformation, with dislocation density increasing with grain size and twin lamellae thickness.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Karuppasamy Pandian Marimuthu, Giyeol Han, Hyungyil Lee
Summary: The study investigates the effect of modulation ratio on the mechanical characteristics of multilayer Zr-based TFMG, demonstrating that appropriate selection of layer pattern and modulation ratio can improve mechanical performance. The proposed FE model can be utilized for achieving maximum mechanical performance of TFMG coated products.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Zhengchen Dong, Jiajun Zhu, Yinping Hu, Wu Ren, Licai Fu, Wulin Yang, Deyi Li, Lingping Zhou
Summary: In this study, Cu-76 at.% Ag multilayers without a diffusion barrier component were prepared by magnetron sputtering co-deposition. The hardness of the co-deposited multilayers was found to be higher than that of mixed monolayers with similar average grain size due to hindering dislocation movement. When the compositional modulation period was reduced, the hardness increased. The study proposes a novel multilayer material system and elucidates the strengthening mechanism of hardness.
Article
Crystallography
Shivam Dangwal, Kaveh Edalati, Ruslan Z. Z. Valiev, Terence G. G. Langdon
Summary: Strengthening and softening mechanisms in ultrafine-grained materials have been debated for many years. This study examines the Hall-Petch relationship in ultrafine-grained magnesium, aluminum, copper, and iron. The results show that while the materials follow the Hall-Petch relationship initially, an up-break occurs for grain sizes below 500-1000 nm. This is due to enhanced dislocation contribution. However, a down-break occurs for grain sizes smaller than 70-150 nm due to diminished dislocation contribution and increased thermally-activated phenomena. The study also finds that strategies other than grain refinement, such as microstructural stabilization by segregation or precipitation, are necessary to achieve extra strengthening.
Article
Metallurgy & Metallurgical Engineering
Hiroyuki Yasuda, Ken Cho, Yohei Murozumi, Masanobu Nomoto, Hiroki Toda, Wataru Suzuki
Summary: Hall-Petch slopes of Fe-based alloys were measured by nanoindentation tests, and the pop-in phenomenon associated with slip transfer across grain boundaries was observed. The Hall-Petch slope depended on the alloying element and its segregation at grain boundaries, as well as the type of grain boundary and the combination of activated slip systems in neighboring grains.
TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN
(2022)
Article
Chemistry, Multidisciplinary
Lina Chen, Yang Chen, Kaiyuan Zhou, Haotian Li, Yong Pu, Yongbing Xu, Youwei Du, Ronghua Liu
Summary: Spin-torque nano-oscillators show promise for various nanodevices due to their tunability, fabrication ease, and durability. Experimental parameters such as excitation current, magnetic field strength and orientation, and temperature can selectively excite specific frequency bullet modes. Fluctuations in magnetic properties allow for experimental control of spin-torque driven magnetization dynamics, promoting the application of nonlinear magnetization oscillators in magnon-based devices and neuromorphic computing.
Article
Chemistry, Multidisciplinary
Florence Baras, Olivier Politano, Yuwei Li, Vladyslav Turlo, Sergey Zharkov
Summary: Using molecular dynamics simulations, nanometric multilayers composed of immiscible silver (Ag) and nickel (Ni) metals were studied. The results showed that at high temperatures, there was enhanced mobility and partial dissolution of Ni within the amorphous Ag at the interface. The study also examined the grooving phenomenon at grain boundaries in polycrystalline layers.
Article
Physics, Applied
Yaodong Wang, Jianjun Li
Summary: Experiments have shown that introducing interlayers of several nanometers, such as amorphous and crystalline interlayers, among constituent layers in nanolayered metallic composites can significantly enhance their mechanical performance. The optimal interlayer thickness for Cu/Ni layered composites with Ag interlayers is found to be 2.1 nm for tension and 4.2 nm for compression, leading to the alleviation of stress concentration by stimulating abundant interfacial dislocations. These findings suggest that the introduction of additional interlayers is a new route to design stronger nanolayered metallic composites.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Haixue Chen, Xinyue Wang, Zejun Zeng, Guoqi Zhang, Jing Zhang, Pan Liu
Summary: This research explores a silver-coated copper (Cu@Ag) paste with sufficient mechanical properties and high-temperature reliability as an alternative to silver sintering at a lower cost. Different solvent systems and particle morphologies were investigated, and their sintering performance and microstructural evolution were compared and analyzed. The influence of key sintering process parameters on Cu@Ag joints was analyzed, and high-temperature aging and thermal cycling tests were conducted to evaluate the reliability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Shu Wang, Zhican Zhou, Fengyou Yang, Shengyao Chen, Qiaoxuan Zhang, Wenqi Xiong, Yusong Qu, Zhongchang Wang, Cong Wang, Qian Liu
Summary: By studying the band structures and electron transport properties of MoS2 atomristor, researchers have obtained a comprehensive memristive mechanism and successfully realized MoS2 all-atomristor logic gates. This discovery will open up many new opportunities for next-generation logic computing and data processing.
Article
Energy & Fuels
Hongjun Gao, Yinbo Zhao, Shuaijia He, Junyong Liu
Summary: This paper proposes a novel multi-energy retail package mechanism for demand response management in a community integrated energy system. The mechanism aims to promote peak shaving of electricity and gas loads and valley filling of electricity load in the system. A bi-level optimization model is built to optimize packages with different response requirements and discounts, and the effectiveness of the mechanism is verified through example analysis.
Article
Chemistry, Analytical
Xiaosen Cui, Zhaorui Lu, Zhongchang Wang, Wen Zeng, Qu Zhou
Summary: Fiber-like p-CuO/n-ZnO heterojunction gas sensing materials were prepared to detect the decomposition byproducts of SF6: H2S and SO2. The sensors showed excellent performance in detecting H2S and SO2 with higher and faster response-recovery time. The sulfuration-desulfuration reaction between H2S and the sensing materials might contribute to the enhanced sensor performances. Furthermore, the sensors exhibited high response to low exposure of H2S and SO2 gas.
Article
Materials Science, Multidisciplinary
Yong Chen, Hongmei Zhu, Pengbo Zhang, Zhongchang Wang, Meng Wang, Gang Sha, He Lin, Jingyuan Ma, Zhenyuan Zhang, Yong Song, Pengfei Zheng, Lihua Zhou, Sheng Li, Hao Liu, Longzhang Shen, Changjun Qiu
Summary: The effective strategy to enhance impurity tolerance in structural steel is to increase solidification rate. By using laser additive manufacturing, we successfully engineered C, N and O with high contents as interstitial atoms coordinated with Cr in the form of short-range ordered assembly, resulting in the development of an impurity-tolerant supersaturated austenitic stainless steel with high strength, good ductility, enhanced corrosion resistance, and acceptable thermal stability.
Article
Physics, Applied
Mengye Duan, Tao Fu, Yang Pan, Xuyang Liu, Xianghe Peng
Summary: The effects of stacking faults (SFs) on the mechanical properties of high-entropy alloys (HEAs) cannot be ignored. In this study, we investigated the SF strengthening of CoCrFeMnNi and clarified its potential mechanism. It was found that CoCrFeMnNi with more SFs exhibited higher strength and hardness, demonstrating significant SF strengthening. Atomistic simulations showed that the strengths of CoCrFeMnNi samples containing SFs or twin boundaries were higher than that of single crystal ones. Overall, our results highlighted the importance of SFs in influencing the mechanical properties of FCC HEAs, and the provided atomistic insights into the strengthening mechanism of HEAs could be beneficial for improving their mechanical properties.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Xiang Chen, Wei Jiang, Sheng Lu, Shuang Zhao, Ying Ma, Hanjie Hu, Tao Fu, Xianghe Peng
Summary: This study investigates the influence of superelastic material parameters on the uniaxial and nanoindentation behavior of a NiTi SMA. The elastic modulus and phase transformation strain are found to significantly influence the indentation process, while the superelastic modulus and Poisson's ratio have a negligible effect. An orthogonal design method is used to analyze the variation and influence of superelastic material parameters on indentation behavior. The results demonstrate that the elastic modulus and phase transformation strain have a significant impact on the maximum indentation force and indentation loss work.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Jingpeng Hou, Keliang Qiu, Fengshi Li, Zhenyu Yang, Yonghai Yue, Yongjun Tian, Zhongchang Wang, Lin Guo
Summary: Twin boundary (TB) is a special and fundamental internal interface that alters the mechanical and physical properties of materials. The deformation mechanism of TB and its effect on material strength and plasticity are still under debate. This study discovered that the pseudoelastic strain of a TB can recover with decomposition and escape of pile-up dislocations, which opens up new possibilities for optimizing material properties by manipulating twin boundaries at the nanoscale.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Hongzhi Huang, Haitao Li, Xianghe Peng
Summary: In this paper, the rheological properties and shear performance of magnetorheological (MR) gels were studied. A modified viscoelastic resistance model was proposed to describe the interaction between the matrix and particles. A numerical simulation approach was developed to study the evolution of chain-like microstructures and the shear properties of MR gels. The effect of magnetic field intensity on the shear strength of MR gels is consistent with the magnetization characteristics of particles.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tian Zheng, Pengfei Hu, Zhongchang Wang, Tianqi Guo
Summary: A 2D amorphous strategy for sodium ion batteries (SIBs) is proposed using amorphous iron selenide sulfide nanosheets (a-FeSeS NSs) as an anode material, demonstrating remarkable rate capability and long-life cycle performance. This study provides a new approach for structural engineering of other electrode materials.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Binbin Jia, Lidong Li, Chuang Xue, Jianxin Kang, Li-min Liu, Tianqi Guo, Zhongchang Wang, Qizheng Huang, Shaojun Guo
Summary: This study reports a sacrificial protection strategy to stabilize crystalline CuO by embedding active amorphous SnO2, which greatly enhances the electrocatalytic sensitivity, activity, and stability for CO2RR to formate. The hybrid catalyst exhibits superior selectivity and current density, outperforming industrial benchmarks.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiang Chen, Lei Liu, Rongjian Gao, Sheng Lu, Tao Fu
Summary: In this study, the shock behavior of CoCrFeMnNi high entropy alloys (HEAs) was investigated at the microscopic level using molecular dynamics method. Different structures of HEAs were simulated and their microstructure evolution and changes in physical parameters were analyzed to reveal the response laws and propagation characteristics of shock waves in various heterogeneous regions of HEAs.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Chuanying Li, Tao Fu, Xule Li, Hao Hu, Xianghe Peng
Summary: Simple shear and pure shear are two common methods for investigating the mechanical responses of materials using first-principles calculations. However, the stress-strain responses and deformation modes obtained are different. By studying HfC and TaC, a semiconstrained method that combines the advantages of the two methods is proposed to better describe their mechanical responses. Moreover, the Mohr-Coulomb relation is extended to unify the shear stresses obtained in different ways, explaining the enhancement of yield shear strength caused by pressure in terms of the friction between atomic layers.
Article
Chemistry, Multidisciplinary
Yuting Guo, Haiyi Sun, Meng An, Takuya Mabuchi, Yinbo Zhao, Gaoyang Li
Summary: This study combines molecular dynamics simulation, multi-attribute point cloud dataset, and deep learning network to map anisotropic wetting surfaces to the static and dynamic behaviors of water molecules and predict water transport behavior. A nanoparticle tracking optimization strategy is proposed to improve the prediction of chaotic water molecule flow. The results demonstrate the superior performance of the deep learning framework in terms of accuracy, computational cost, and visualization, and its potential for modeling different molecular transport behavior. This research is expected to promote the development of real-time water flow prediction at interfaces and contribute to surface structure optimization and design in nanofluidic devices.
Article
Chemistry, Inorganic & Nuclear
Lei Wu, Ruixin Zhang, Qun Jing, Hongyu Huang, Xianmeng He, Zhongchang Wang, Zhaohui Chen
Summary: A new UV NLO orthophosphate β-Li2RbBi(PO4)2 with a polar structure and high second harmonic generation response has been successfully synthesized. First-principles calculations reveal that the synergistic effect of P-O and Bi-O groups significantly contributes to the optical properties of this compound.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Xiang Chen, Wei Jiang, Sheng Lu, Baomei Qiu, Tao Fu
Summary: This study investigates the plastic deformation mechanism of NiTi SMA using a polycrystalline nanoindentation model. The results show that the {110}<111> slip system contributes the most to plastic deformation, while the {010}<100> slip mode contributes the least.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we theoretically investigate the pump-probe response and the four-wave mixing spectrum in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle. Using a density matrix methodology, we calculate the absorption/gain, dispersion, and four-wave mixing spectra, and analyze their spectral characteristics. We also apply the metastate theory and the dressed-state picture to predict the positions of the spectral resonances.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
L. S. Lima
Summary: This study investigates quantum correlation and entanglement in the non-Hermitian Hubbard model. By analyzing quantum entanglement measures such as entanglement negativity and entropy, the effect of non-Hermitian imaginary hopping on the system is explored. It is found that in the large... limit, the non-Hermiticity reverses the behavior of the ground state energy and low-lying excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Nam-Chol Ri, Chung-Sim Kim, Sang-Ryol Ri, Su-Il Ri
Summary: By decreasing the lattice thermal conductivity of GNR through chemical derivation and strain, enhancing the thermoelectric properties of the electron part can be an important method to approach PGEC. This paper proposes synthesized hybrid systems formed by chemical derivation in the middle parts of b-AGNRs, and investigates the band structures and thermoelectric properties of the electron part under different strains. The results show that the band gaps of the systems significantly increase under different strains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Le T. T. Phuong, Tran Cong Phong
Summary: This study investigates the effects of gas molecules adsorbed on /312-borophene on its electronic heat capacity and thermal Schottky anomaly. The results show that the adsorbed gas molecules have different impacts on the electronic heat capacity, leading to the generation of various new energy levels.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Tianyan Jiang, Jie Fang, Wentao Zhang, Maoqiang Bi, Xi Chen, Junsheng Chen
Summary: This paper investigates the adsorption and sensing properties of transition metal-doped WSSe gas-sensitive devices towards H2, CO, and CO2 gases related to thermal runaway in Li-ion batteries using density functional theory. The results show that Ti, Mn, and Mo dopants preferentially bind to the S-surface of the WSSe monolayer, and all three monolayers exhibit significantly improved sensing characteristics, with chemisorption towards CO. Band structure analysis suggests that the Ti-WSSe monolayer has the potential to be used as a resistive CO detection sensor. Recovery time calculations indicate the reuse capabilities of the gas-sensitive devices. Mn-WSSe monolayer shows potential for H2 detection, while Mo-WSSe monolayer is more suitable for CO2 detection. This work lays the foundation for potential gas-sensitive applications of WSSe monolayer in thermal runaway scenarios, advancing research in gas sensing domains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Olga A. Alekseeva, Aleksandr A. Naberezhnov, Ekaterina Yu. Koroleva, Aleksandr Fokin
Summary: This study investigates the temperature dependence of crystal structure and dielectric response in a nanocomposite material containing porous glasses and embedded sodium nitrate. The results reveal a crossover point in the temperature dependence of the order parameter of the structural transition in sodium nitrate nanoparticles, as well as a decrease in activation energy of sodium ions hopping conductivity during heating.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Lijun Cheng, Fang Cheng
Summary: This paper investigates the effects of electric and magnetic fields on the Goos-Hanchen (GH) shift in a semi-Dirac system. The results show that the magnitude and direction of the GH shift depend on various factors such as incidence angle, electric barrier height and width, and magnetic field. It is observed that there is a saltus step in GH shifts at the critical magnetic field, which decreases with increased potential barrier thickness. Additionally, the GH shift can be significantly enhanced by applying an electric field in the III region. These findings are important for the development of semi-Dirac based electronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Alexander K. Fedotov, Uladzislaw E. Gumiennik, Julia A. Fedotova, Janusz Przewoznik, Czeslaw Kapusta
Summary: The study conducted an improved analysis of carrier transport in single-layer graphene and hybrid structures, showing the coexistence of negative and positive contributions in magnetoresistive effect. Various models were used to analyze the dependences on temperature and magnetic field, providing insights into the behavior of electrical resistance in the structures.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xuhui Peng, Tao Chen, Ruotong Chen, Shizheng Chen, Qing Zhao, Xiaoping Huang
Summary: In this study, a novel method was proposed to design and fabricate optoelectronic devices with highly precise controlled photorefractive liquid crystal structures. By utilizing quantum dots and electric tuning, a regular periodic grating was formed in a quantum dot-doped liquid crystal volume illuminated by a laser standing evanescent wave field. The obtained optical diffraction pattern showed equally spaced light spots and high diffraction efficiency, indicating a significant change in the refractive index of the nanostructured device.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Kai-Hua Yang, Xiao-Hui Liang, Huai-Yu Wang, Yi-Fan Wu, Qian-Qian Yang
Summary: In this work, a theoretical model is proposed to achieve the controllability of quantum interference and decoherence. The effects of intralead Coulomb interaction, interdot tunneling, and electron-phonon interactions on differential conductance are investigated. The results show the appearance of destructive interference, Fano interference, and negative differential conductance in strong dot-lead tunneling regions, while a characteristic pattern of positive and negative differential conductances appears in the weak dot-lead tunneling regime.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xueying Wang, Qian Ma, Qi Zhang, Yi Wang, Lingyu Li, Dongheng Zhao, Zhiqiang Liu
Summary: Porous double-channel alpha-Fe2O3/SnO2 heterostructures with tunable surface/interface transport mechanism were successfully fabricated by electrospinning and calcination. These heterostructures exhibited a large specific surface area, providing more active sites and enhanced adsorption capacity. The optimal composite materials showed the highest response value and the fastest response/recovery times to DMF, along with good cycling performance, long-term stability, and high gas selectivity.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Donglin Guo, Zhengmeng Xu, Chunhong Li, Kejian Li, Bin Shao, Xianfu Luo, Jianchun Sun, Yilong Ma
Summary: Using full electron-phonon interactions and the Boltzmann transport equation, this study investigates the phonon scattering channel and electrical properties of graphene under anharmonic phonon renormalization (APRN). The results show that the APRN reduces the phonon frequency and three-phonon phase space with increasing temperature, affecting the acoustic branch more than the optical branch. The thermal conductivity of graphene decreases after considering three- and four-phonon scattering, and the primary scattering channels are identified. Furthermore, the APRN increases the strength of electron-phonon coupling and leads to an increase in n-type electric resistance at room temperature.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Hongping Zhao, Man Zhao, Dayong Jiang
Summary: The study proposes a broadband photodetector with high response, high sensitivity, and controllable band by integrating quantum dots and highly conductive materials. The PD composed of ZnO film/PbS quantum dots heterostructure shows excellent photoresponse performance in the UV-Vis-NIR range, with the peak responsivity increased by 550%, accompanied by significant red shift, faster response, and recovery speed. By using RF magnetron sputtering to prepare ultra-thin ZnO film, the impact of PbS quantum dots on the photoelectric properties of ZnO film is comprehensively and systematically discussed.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Ye Xuan Meng, Liwei Jiang, Yisong Zheng
Summary: Manipulating magnetism by electrical means is an effective method for realizing ultra-low power spintronic-integrated circuits. In this study, it is demonstrated that the two-dimensional semiconductor material InO monolayer can be tuned to a half-metallic state by applying a gate voltage, providing theoretical guidance for adjusting two-dimensional magnetic semiconductors.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Anusha Kachu, Aalu Boda
Summary: In this research, we investigated the impact of confinement nature on a neutral hydrogenic donor impurity in a quantum dot. The study demonstrated intriguing behavior in response to changes in potential shape, quantum dot parameters, and spin-orbit coupling strengths. The findings provide valuable insights into the fundamental physics of quantum dots and impurities and can aid in the design and optimization of QD-based technologies.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
