Article
Engineering, Multidisciplinary
Kai Tang, Mohammad Amin Masoumi, Hamid Rajabi, Seyed Alireza Rozati, Omid Ali Akbari, Farnaz Montazerifar, Davood Toghraie, Mohammad Khalili
Summary: This paper presents a numerical simulation study of graphene nanoplatelet (GNP) - sodium dodecylbenzene sulfonate (SDBS) - water nanofluid. The study indicates that higher Reynolds numbers lead to increased convective heat transfer coefficients, decreased temperature gradients, and increased influence of cooling fluid temperature in the warm areas near the solid wall. Furthermore, higher Reynolds numbers also result in larger development lengths and decreased outlet section temperatures.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Hao Ma, Boshu He, Liangbin Su, Di He
Summary: This study investigates the laminar nanofluid flow and convective heat transfer at the entry region of microtubes under constant wall temperature and constant heat flux boundary conditions. The results show that the entrance effect dominates pressure drop and thermal performance of the nanofluids near the entrance of the channel, while the influences of particle concentration and particle size gradually become evident as the axial distance increases.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Mahdi Tabatabaei Malazi, Kenan Kaya, Ahmet Selim Dalkilic
Summary: This paper investigates the hydraulic and thermal performances of a three-dimensional rectangular microchannel with circular pin-fins. Laminar flow with Reynolds values between 50 and 150 was considered, and a total of 20 cases were studied. The results show that the increase in Reynolds number and decrease in fin spacing lead to an increase in Nusselt number and a decrease in average outlet temperature. The pressure drop is influenced by Reynolds number and the number of fins. Comparing microchannels with different fin spacing, the one with l/d = 2 demonstrates higher average outlet temperature, pressure drop, and Nusselt number for Re = 150.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mehdi Salari, Mohammad Reza Assari, Ashkan Ghafouri, Nader Pourmahmoud
Summary: The heat transfer characteristics of MgO-EG nanofluid flowing in a double tube heat exchanger with a partial porous material were experimentally investigated. The results showed that using nanofluid and porous media significantly improved heat transfer. The use of partial porous media is recommended to enhance the thermal performance of heat exchangers in industrial applications.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Amir Heidarshenas, Zoha Azizi, S. M. Peyghambarzadeh, S. Sayyahi
Summary: Recent research focuses on the preparation and application of nanofluids with specific requirements, such as durability, stable suspension of particles, and negligible agglomeration. A novel nanofluid containing ionic liquid-alumina nanohybrids was studied for its thermal performance and stability in miniature heat transfer devices. The hybrid nanofluid showed improved thermal performance compared to alumina nanofluid, especially at smaller particle sizes, making it a promising option for small scale heat transfer applications.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Seyedmahmood Kia, Shoaib Khanmohammadi, Ali Jahangiri
Summary: In this study, the heat transfer and pressure drop properties of Al2O3 and SiO2/Base oil nanofluid flow in a helical tube were investigated numerically and experimentally. The impact of various parameters, including flow Reynolds number, fluid temperature, nanoparticles, and weight concentrations, on the heat transfer factor and pressure drop was analyzed. The results showed that nanofluid enhanced the heat transfer factor and pressure drop compared to the base fluid. The Al2O3 nanofluid exhibited higher heat transfer coefficient than the SiO2 nanofluid. The maximum heat transfer rate was achieved with 0.5% mass concentrations of Al2O3 and SiO2 nanofluids. The helical tube geometry improved heat transfer by 19.5%, and reducing helical pitch and pitch circle diameter further enhanced the heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Ravikiran Balaga, Ramji Koona, Subrahmanyam Tunuguntla
Summary: The impact of various variables on thermal conductivity and rheological behavior, such as nanoparticle weight concentration and temperature, as well as the cumulative effects of wire coil insert and twisted tape on heat transfer coefficient and friction factor characteristics, is explored. The findings show that higher content of nanoparticles increases heat transfer as well as pressure drop.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Krishanu Kumar, Pankaj Kumar
Summary: A three-dimensional numerical simulation was conducted to study fluid flow and heat transfer characteristics in a rectangular microchannel heat sink with arc grooves. Results show that adding grooves can enhance heat transfer in the microchannel but may increase the Poiseuille number; groove depth affects the performance of the microchannel at low Reynolds numbers, but has no significant effect on performance enhancement at high Reynolds numbers; groove configuration also plays a major role in enhancing the performance of the microchannel.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Xianfei Liu, Hui Zhang, Fang Wang, Caixia Zhu, Zhiqiang Li, Doudou Zhao, Hao Jiang, Yuhang Liu, Zirui Zhang
Summary: The study proposes an innovative wavy microchannel heat sink with fan-shaped ribs, and validates its advantage in improving thermal performance by considering thermo-physical properties. New insights into flow and heat transfer mechanisms are obtained. The study also finds that the geometric parameters of the ribs significantly affect the thermal performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Yongfeng Ju, Tiezhu Zhu, Ramin Mashayekhi, Hayder Mohammed, Afrasyab Khan, Pouyan Talebizadehsardari, Wahiba Yaici
Summary: Increasing the number of semi-twisted tapes in a heat exchanger pipe leads to enhancement in heat transfer and friction factor, which is significant for heat exchange using nanofluids.
Article
Thermodynamics
Mohamed Hekal, Wael M. El-Maghlany, Yehia A. Eldrainy, Mohammed El-Adawy
Summary: Nowadays, fabric air duct (FAD) systems are the most cost-effective and aesthetically appealing way to evenly distribute heated or cooled air to large open interior spaces. This research aims to develop a proper procedure to calculate the friction factor and Nusselt number of the air flow inside fabric air ducts and to create a validated CFD air distribution model to predict airflow pattern and heat transfer parameters. Experimental assessment of different configurations of fabric air ducts was conducted and empirical correlations were obtained for designing well-balanced FAD systems.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Alireza Dibaji, Seyed Amin Bagherzadeh, Arash Karimipour
Summary: The paper simulated nanofluid forced convection in a microchannel and found that increasing rib height and slip coefficient at high Reynolds numbers and nanofluid volume fractions improved heat transfer rate. The ribs also affected flow physics, with slip velocity decreasing as nanofluid volume fraction and rib height increased. The study used forced heat transfer of water-copper nanofluid in a two-dimensional microchannel and investigated the effects of various parameters on the Nusselt number and other factors. After studying the relationships between different variables, a non-parametric function was estimated using artificial neural networks, and a set of optimal decision parameters was established using Genetic Algorithm.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
Mohammadreza Niknejadi, Masoud Afrand, Arash Karimipour, Amin Shahsavar, Amir Homayoon Meghdadi Isfahani
Summary: This experimental investigation focuses on analyzing the laminar forced convection of water-based nanofluid (NF) containing Fe3O4 nanoparticles inside a twisted tube. The study examines the impacts of NF concentration, Reynolds number, and twist pitch on the average Nusselt number, friction factor, and overall hydrothermal performance indicator. The results show that the overall hydrothermal performance of NF in the twisted tube is superior to that of water in the plain tube, with the best performance occurring at NF concentration of 2% and twist pitch of 10 mm.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Mechanical
Seyed Morteza Javadpour, Mostafa Dehghani
Summary: This study investigated the heat transfer and fluid flow parameters of Ag-water nanofluid through a ribbed rectangular channel in the presence of a magnetic field. The effects of Reynolds numbers, Hartmann numbers, and nanofluid volume fractions on Nusselt numbers, entropy generation, and velocity profiles were analyzed. The results showed a critical Reynolds number for minimum entropy generation and enhanced thermal performance with increasing Reynolds number.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Thermodynamics
Mingzheng Ye, Jianqiang Du, Jin Wang, Lei Chen, Petar Sabev Varbanov, Jiri Jaromir Klemes
Summary: In this paper, a combined structure of fan-shaped cavities and oval pin fins is designed for a rectangular microchannel heat sink. The effects of different structural parameters on the performance are investigated. The results show that the microchannel exhibits improved hydrothermal performance under the optimal parameter combination.
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Erfan Mohammadnejad Ardeshiri, Davood Toghraie
Summary: The viscosity of MWCNT (20%)-ZnO(80%)/SAE50 hybrid nanofluid (HNF) is investigated using statistical approach (RSM) and compared with other models. The study is conducted under laboratory conditions with varying temperature, volume fraction, and shear rate. The aim of this research is to identify the best model function and determine the optimal lubrication mode in cold and hot environments. The Quartic model shows the highest significance and predictive power among all the models analyzed.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Hemmat Esfe, Saeed Esfandeh, Fatemeh Amoozadkhalili, Davood Toghraie
Summary: This study utilizes artificial neural network (ANN) to forecast the viscosity of nanofluids. The multilayer perceptron (MLP) ANN algorithm is used, with temperature, volume fraction of nanoparticles, and shear rate as inputs, and viscosity as output. The optimal sample is selected from various ANN samples, resulting in an accurate predictive model.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Hemmat Esfe, S. Ali Eftekhari, As'ad Alizadeh, Saman Aminian, Maboud Hekmatifar, Davood Toghraie
Summary: Due to poor thermal conductivity, fluid limitation exists in various industries, leading to the improvement of base fluid properties as a new method. Nanofluids are produced by adding metal nanoparticles and multi-walled carbon nanotubes (MWCNT) in nanofluid research. Mathematical models, especially artificial neural networks (ANNs), are used to investigate the effect of various parameters on nanofluid properties and have replaced traditional statistical methods.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Nuclear Science & Technology
Mohammad Hemmat Esfe, Davood Toghraie, Erfan Mohammadnejad Ardeshiri
Summary: In this report, the rheological behavior of MWCNT (50%)-MgO (50%)/SAE40 hybrid nanofluid (HNF) is investigated experimentally/statistically/numerically. The HNF is found to exhibit pseudo-plastic non-Newtonian behavior, and mathematical models are developed to estimate laboratory data and simulate flow in a branch pipe. The results provide valuable insights into understanding and predicting the rheological behavior of this specific nanofluid.
ANNALS OF NUCLEAR ENERGY
(2023)
Article
Environmental Sciences
Hongying Lv, Wenxin Zhang, Maryam Hosseini, Majid Riahi Samani, Davood Toghraie
Summary: In this study, the removal of hexavalent chromium from aqueous environments was investigated using polyaniline composites with natural waste materials. The polyaniline/walnut shell charcoal/PEG composite showed the highest chromium removal efficiency of 79.22%. It also had a larger specific surface area, leading to an increase in its removal efficiency. The optimum pH and contact time for this composite were found to be 2 and 30 minutes, respectively. The maximum calculated adsorption capacity was 500 mg/g.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Materials Science, Multidisciplinary
Xun Cheng, Shichuan Chang, Bujuan Zhang, Xianqin Luo, Hui Rao, Roozbeh Sabetvand, Davood Toghraie
Summary: Early detection of cancer is crucial, and this study investigates the atomic behaviors of cancer cells to better understand and diagnose them. By conducting molecular dynamics simulations, the stability of cancer cells at different initial pressures is predicted. The results suggest that increasing the initial pressure can enhance the recovery velocity of cancer cells.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Soheyl Alidust, Majid Motallebi, Davood Toghraie
Summary: The viscosity of 10W40-based hybrid nanofluid was modeled using response surface methodology (RSM). Four transfer functions were evaluated, and the square root transfer function showed the best performance.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Seyed Naser Hosseini Tamrabad, Hossein Hatami, Soheyl Alidoust, Davood Toghraie
Summary: The present study predicts the dynamic viscosity of SiO2 (60%) -MWCNT (40%) hybrid nanofluid in SAE40 oil as base fluid by comparing various RSM models. The Quartic model was selected as the optimal model due to its acceptable accuracy in predicting the viscosity values of the nanofluid. The findings provide insights into the rheological behavior of the hybrid nanofluid and SAE40 engine oil in cold environmental conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
M. R. Morovvati, B. Mollaei-Dariani, A. Lalehpour, D. Toghraie
Summary: This study aims to grow carbon nanotubes on aluminum substrates using TCVD to allow for cladding of aluminum sheets. FEM was used to evaluate damage progression and fracture initiation in AL-CNT composites. RVE models were studied to determine the most effective carbon nanotube weight percentage as a contender to reinforce the aluminum matrix. Experimental results showed that AL-5 wt.% CNT had the best physical properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Jiangbo Tang, A. Ahmadi, As'ad Alizadeh, Reza Abedinzadeh, Azher M. Abed, Ghassan Fadhil Smaisim, Salema K. Hadrawi, Navid Nasajpour-Esfahani, Davood Toghraie
Summary: Metal matrix composites with nano-particle reinforcement have unique mechanical and thermal properties, making them suitable for various structural and thermal applications. In this study, molecular dynamics simulation was used to model and investigate the effects of reinforcing nano-particles on the hardness of aluminium-based composites. The results showed an increase in hardness with the addition of nanoparticles, and the analysis of the radial distribution function confirmed the proper balance of the simulated atomic systems. These findings have practical implications for the use of aluminium-based composites in industrial, engineering, and medical fields.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Thermodynamics
Mohammad Esmaiel Sayadzadeh, Majid Riahi Samani, Davood Toghraie, Sobhan Emami, Seyed Ali Eftekhari
Summary: This study evaluates the emission characteristics of pollutants in conventional and MILD combustion and performs chemical and physical exergy analyses. The results show that the overall exergy efficiency improves and NOx emissions decrease significantly in MILD combustion compared to conventional combustion. Chemical exergy is higher than physical exergy initially and then decreases due to chemical reactions, while physical exergy increases with temperature. The total exergy stabilizes at a certain distance from the burner.
Article
Chemistry, Physical
Wei Zhu, Farahnaz Saberi, S. Mohammad Sajadi, Navid Nasajpour-Esfahani, Maboud Hekmatifar, As'ad Alizadeh, D. Toghraie, Roozbeh Sabetvand
Summary: This study investigated the effect of graphene nanosheets (GNS) on the hydraulic fracturing process using molecular dynamics simulation. The results showed that adding GNS to the mixture can optimize the hydraulic fracturing process and reduce operating costs.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Xiaowei Chen, A. Ghorbani, Long Quan, D. Toghraie
Summary: Sports injuries are a common problem for athletes, ranging from minor sprains to severe fractures and concussions. Microfluidic devices have shown promise in sports medicine by analyzing small samples of sweat, blood, or urine to provide real-time data on an athlete's physiological status. This information can optimize training, prevent injuries, and also contribute to the development of diagnostic and therapeutic methods for cancer and other diseases.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Kavoos Razmjooee, Azin Rashidy Ahmady, Naghmeh Arabzadeh, Sara Ahmadi, Saeed Saber-Samandari, Davood Toghraie
Summary: In this study, a novel triple-network Gelatin/Polyacrylamide/Carboxymethyl chitosan hydrogel was synthesized using an innovative aqueous-based method. The hydrogel consisted of physically crosslinked gelatin as the first network, and covalently crosslinked Polyacrylamide and Carboxymethyl chitosan as the second and third networks, respectively. The physical and mechanical properties of the hydrogels could be tuned by adjusting the concentration of the crosslinking agent. The synthesized hydrogels exhibited desirable characteristics such as tailor-made porosity, good mechanical strength, high swelling ratio, and high thermal stability. Cell viability assays showed that the hydrogels were non-toxic and supported adequate cell viability. Therefore, these hydrogels show great promise for various medical applications such as tissue engineering scaffolds, delivery systems, and wound dressings.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yuan Zhou, E. Abdali, Ahmadreza Shamshiri, Mohammed Al-Bahrani, Naiser Sadoon, S. Ali Eftekhari, Furqan S. Hashim, Navid Nasajpour-Esfahani, Abdullah Jalel Khazel, Laith Yassen Qassem, Davood Toghraie
Summary: This study investigates the mechanical characteristics of graphene nanosheets using the molecular dynamics method. The simulations show that the fracture lengths of nanosheets with zig-zag and armchair structures are different, and increasing temperature and pressure lead to longer crack lengths. The type of nanosheet structure affects the mechanical properties, with nanosheets with armchair edges exhibiting better performance. Furthermore, the presence of boron, nitrogen, or a combination of these impurities improves the mechanical properties and resistance to crack growth in graphene nanosheets.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(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)
