Article
Chemistry, Multidisciplinary
Fan Ru, Jing Xia, Xuanze Li, Yifan Wang, Ze Hua, Ruiwen Shao, Xuecong Wang, Chun-Sing Lee, Xiang-Min Meng
Summary: In this study, well-aligned single-crystalline ZnO/ZnS core/shell nanorod arrays were successfully obtained by introducing an Al2O3 buffer layer. A rational growth mechanism of the core/shell heterostructure was proposed based on detailed characterization, showing that Al2O3 can effectively improve the optical properties of the ZnO/ZnS heterostructure.
Article
Chemistry, Physical
Hao-Cheng Chien, Bo-You Wu, Pei-Kai Hsu, Yi-Che Chen, Jenn-Ming Song, Alexandre Gloter, Shih-Yun Chen
Summary: This study demonstrates the tunable luminescence and magnetism of mesoscopic ceria-organic core-shell hollow spheres. By growing an organic layer on the surface of ceria hollow spheres through a hydrothermal reaction, the samples exhibit ferromagnetic and luminescent properties due to the structural changes of the surface organic phase and underlying ceria.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Analytical
Shichao Wang, Xiaohu Wang, Gaoqun Qiao, Xiaoyan Chen, Xinzhen Wang, Hongzhi Cui
Summary: Core-double shell-structured ZnO@In2O3@ZnO microspheres were successfully synthesized by decorating In2O3 and ZnO on the surface of ZnO hollow microspheres, exhibiting excellent gas sensing properties with high response to gases like ethanol, especially at low concentrations. This superior gas sensing performance was attributed to its high specific surface area, abundant surface defects, and radial electronic modulation mechanism.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Xiaoyan Song, Fangzheng Zhao, Zhipeng Wang, Runbin Ge, Jinfeng Xing
Summary: In this study, ZnO@SnO2-Pt core-shell nanofibers with a hollow structure were successfully prepared and exhibited superior gas-sensing performance, achieving higher response speed and sensitivity on the basis of reduced operating temperature. Additionally, the gas-sensing mechanism of the nanofibers was discussed in detail.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Ye Tian, Zhigao Xue, Qingqing Zhao, Jie Guo, Kai Tao, Lei Han
Summary: In this study, hierarchical core-shell hollow Co3S4@NiCo2O4 nanosheet arrays were constructed on reduced graphene oxide/nickel foam (rGO/NF) through a metal-organic framework (MOF)-engaged strategy, which exhibited significantly improved specific capacitance, rate capability, and cycling durability compared with Co3S4/rGO/NF. Moreover, it was successfully applied in an asymmetric supercapacitor (ASC) with excellent energy density, cycling stability, and coulombic efficiency.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Narasimharao Kitchamsetti, Daewon Kim
Summary: Hierarchical ZnO/SnO2@NiCo2O4 core-shell nanorod sheet arrays were synthesized, which exhibited enhanced electrical conductivity and corrosion resistance. The hybrid electrode with core-shell heterostructures demonstrated high specific capacity, cycling stability, and rate capability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Analytical
Mingqi Sun, Mingyuan Wang, Chuanxin Ge, Jingran Huang, Yuanfan Li, Pengjia Yan, Shuangying Lei, Mingsong Wang, Ling Bai, Guanjun Qiao
Summary: The exploration of high-performance NO2 sensors is important for air quality monitoring and human health. This study fabricated Au-doped ZnO@ZIF-7 core-shell nanorod arrays for sensitive and selective NO2 detection. The heterostructured ZnO-Au@ZIF-7 sensor showed excellent performance in terms of sensitivity, selectivity, anti-humidity capacity, and long-term stability. This approach combining noble metals doped semiconductor metal oxides (SMOs) and MOF filtration membranes can be extended to the development of advanced chemiresistive gas sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Physical
Xiaoyu Huang, Yuan Yang, Jialu Zhao, Yin Huang, Xiuhua Wang
Summary: In this study, a dual-core layer hollow structure Co3S4@NiCo2S4 nanocages supercapacitor electrode material was successfully synthesized using an appropriate ion-exchange strategy and subsequent vulcanization treatment of MOFs. The Co3S4@NiCo2S4 electrode exhibited a specific capacitance of 1202 F g-1 at 1 A g-1 and retained 80% of its initial capacity at 10 A g-1. The integrated Co3S4@NiCo2S4//AC asymmetric supercapacitor achieved an energy density of 58 Wh kg-1 at a power density of 750 W kg-1. It also showed a capacitance retention of 81.8% after 10,000 galvanostatic charge-discharge cycles. The individual nanostructure and excellent electrochemical properties of Co3S4@NiCo2S4 nanocages provide a rational strategy for developing high-energy-density supercapacitor electrode materials based on MOFs derivatives.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Peidong Shi, Yu Zhang, Guanglu Zhang, Xiaojuan Zhu, Shaohua Wang, An-Liang Wang
Summary: This study successfully prepared a highly efficient catalyst for the hydrogen evolution reaction, demonstrating superior activity and long-term stability. The unique hierarchical core-shell structure allows for effective electron transport and abundant active sites.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Nanoscience & Nanotechnology
Yufei Cheng, Ming Gong, Tete Xu, Enzhou Liu, Jun Fan, Hui Miao, Xiaoyun Hu
Summary: In this study, a core-shell heterostructure nanorod was successfully fabricated, allowing for efficient photocurrent generation and enhanced stability and H2 production rate under neutral conditions. This provides new insights into the design of antimony chalcogenide heterostructure photoelectrodes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Dan Kuang, Jin Cheng, Xuyang Li, Yan Li, Meng Li, Fangjunpeng Xu, Jianshe Xue, Zhinong Yu
Summary: ZnO/ZnMgO core/shell nanorod arrays, fabricated using hydrothermal and radio frequency magnetron sputtering methods, exhibit significant ohmic contact and high photo-to-dark current ratio, with fast rise and decay times under 254 nm and 365 nm illumination. The core/shell nanostructure facilitates the rapid separation of photogenerated electron-hole pairs and suppresses recombination of carriers, making it a promising candidate for future ultraviolet detection applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Juan Wang, Mingwang Pan, Jinfeng Yuan, Gang Liu, Lei Zhu
Summary: A one pot nanoengineering strategy inspired by the automatic transport behavior of water in plants was successfully developed to fabricate spheres-on-sphere (SOS) microspheres with hollow cavities and hierarchical structure. By removing the polystyrene (PS) phase in SOS particles, particles with multiscale hollow structure (SOS-MH) were obtained, reducing the thermal conductivity of composite fibrous membranes and improving moisture resistance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Inorganic & Nuclear
Changhai Liu, Yue Zhang, Ge Yin, Tiantian Shi, Yue Zhang, Zhidong Chen
Summary: In this study, hierarchical structures were constructed by encapsulating porous BiVO4 nanorod arrays with FeOOH and ZnFe layered double hydroxide (ZnFe LDH), aiming to achieve excellent transfer and separation of photogenerated electron-hole pairs. The as-prepared ternary photoanode, BVO/FeOOH/ZnFe LDH, exhibited enhanced visible light absorption, increased carrier density, lower charge transfer resistance, boosted charge injection, bulk separation efficiency, and enhanced PEC performance compared to bare BiVO4. This work provides insights for enhancing the visible light response and boosting PEC performance in BiVO4 heterostructural photoanodes.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
G. Swati, Manoj Morampudi
Summary: A novel methodology and mechanism for synthesizing ZnO/ZnS core-shell nanostructures using a hydrothermal-supported co-precipitation method is presented. The study investigates the structural, morphological, compositional, and optical properties of the ZnO/ZnS core-shell, highlighting the enhanced properties of the ZnO/ZnS structure for optoelectronic applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Jichao Zang, Charu Goel, Muhammad Rosdi Abu Hassan, Wonkeun Chang, Seongwoo Yoo
Summary: The unique characteristics of hollow core fibers make them attractive for designing inline fiber optic devices. We report a novel approach that uses a resonant band of single-ring antiresonant fiber to realize a high-performance hollow-core fiber polarizer. The device offers low transmission loss and a high polarization extinction ratio. These results encourage further development of other hollow-core fiber components.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Geological
Hengshuo Liu, Harianto Rahardjo, Hejun Du, Abdul Halim Hamdany
Summary: In this study, the mechanism of water pressure decay in osmotic tensiometers (OTs) was explored using crosslinked poly(acrylamide-co-acrylic acid) potassium salt (PAM-co-PAAK) as the polymer material. The results showed that the pressure decay of OT was mainly caused by the stress relaxation of the polymer hydrogels, and the standard linear solid (SLS) rheological model was suitable for fitting the decay data. The research also demonstrated that the pressure decay was not due to polymer leakage, as there was no increase in polymer concentration during the decay period.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Xiangwei Qu, Jingrui Ma, Pai Liu, Kai Wang, Xiao Wei Sun
Summary: This work investigates the voltage sweep behavior of quantum dot light-emitting diodes (QLEDs). It is found that red QLEDs with ZnMgO electron transport layer (ETL) experience a drop in efficiency under consecutive voltage sweeps, while devices with ZnO ETL show an increase in efficiency. The analysis reveals that the efficiency drop in ZnMgO devices is related to hole leakage mediated by trap states on ZnMgO nanoparticles. Furthermore, the hole leakage also causes rapid lifetime degradation of ZnMgO devices.
Article
Nanoscience & Nanotechnology
Xijian Duan, Jingrui Ma, Wenda Zhang, Pai Liu, Haochen Liu, Junjie Hao, Kai Wang, Lars Samuelson, Xiao Wei Sun
Summary: HF processing was used to eliminate the InPOx defect in red InP quantum dots and improve the fluorescence efficiency. The record-breaking red InP quantum dots were synthesized with the assistance of tri(dimethylamino)phosphine [(DMA)3P], achieving a maximum photoluminescence quantum yield of 97.7%. The external quantum efficiency and brightness of the quantum dot light-emitting diode device were also improved accordingly.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Hui Zhang, Xiaohu Mi, Bowen Kang, Yunkai Wu, Tingting Zhang, Pai Liu, Xiaowei Sun, Zhenglong Zhang, Ning Liu, Hongxing Xu
Summary: Colloidal nanocrystals play a significant role in optoelectronic devices and their properties can be improved through ligand modification, which can enhance charge transport and emission characteristics in LEDs.
Article
Biochemistry & Molecular Biology
Yunwu Yu, Chunyang Xie, Yan Wu, Peng Liu, Ye Wan, Xiaowei Sun, Lihua Wang, Yinan Zhang
Summary: A novel composite membrane was developed by casting chitosan and polyvinyl alcohol on a glass fiber microporous membrane. The addition of chitosan improved the CO2 permeance and selectivity due to the favorable CO2 affinity of the polymer coating. Chemical structure analysis showed no change after heat treatment, while SEM images revealed a dense surface of the composite membranes. The CO2 permeance and selectivity were further enhanced after wetting and heat treatment.
Article
Nanoscience & Nanotechnology
Lixuan Chen, Jinyang Zhao, Zhiqing Shi, Miao Zhou, Shengdong Zhang, Xiao Wei Sun, Xin Zhang
Summary: Semiconductor quantum rods (QRs) emit polarized light and have great potential for energy-efficient and color-enhancing modern display devices. We present the stretching of an aligned QR polarized film to improve brightness and optical efficiency in quantum-dot based displays. The study of QR material, stretching ratio, and alignment degree guides the fabrication of highly polarized QR film. A large-area film with an alignment degree of 0.635 achieved more than 1.6-fold enhancement in brightness and transmittance compared to traditional structures, making it a viable option for various energy-saving display devices.
Article
Nanoscience & Nanotechnology
Hongmei Zhu, Qingqian Wang, Kun Sun, Wei Chen, Jun Tang, Junjie Hao, Zhaojin Wang, Jiayun Sun, Wallace C. H. Choy, Peter Muller-Buschbaum, Xiao Wei Sun, Dan Wu, Kai Wang
Summary: The chirality of 2D chiral perovskite films has been significantly enhanced by a solvent modulation strategy, leading to the formation of CPL-active materials. By creating chiral perovskite/quantum dot composites, an increase in the CPL intensity was observed, attributed to the generation and transportation of spin-polarized charge carriers as well as the enlarged lattice distortion of the chiral perovskite films achieved through solvent modulation. This approach provides an effective way to construct CPL-active materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Mathematics, Applied
Weidong Li, How Wei Benjamin Teo, Kaijuan Chen, Jun Zeng, Kun Zhou, Hejun Du
Summary: A finite difference-based 3D phase-field model is developed to investigate spherulite growth during the isothermal crystallization of polyamide (PA) 12. The model accurately simulates the morphologies and quantitative characteristics of crystals, validating against experiments. The simulation demonstrates that crystallization temperature affects crystal size and growth rate, and multiple crystals impinge and fill the domain during crystallization, highlighting the capability of the model.
APPLIED MATHEMATICS AND COMPUTATION
(2023)
Article
Physics, Applied
Xiangwei Qu, Guohong Xiang, Jingrui Ma, Pai Liu, Aung Ko Ko Kyaw, Kai Wang, Xiao Wei Sun
Summary: In this work, we find that blue quantum dot light-emitting diodes (QLEDs) exhibit electron over-injection compared to hole injection using impedance spectroscopy and capacitance-voltage characteristics analysis. We also observe the spatial distribution of the exciton recombination zone in blue QLEDs using a red quantum dot as a fluorescent sensor. Our findings provide a practical method for identifying excess carrier in blue QLEDs and have implications for other types of QLEDs.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Multidisciplinary
Weidong Li, Marreddy Ambati, Nhon Nguyen-Thanh, Hejun Du, Kun Zhou
Summary: In this study, a fourth-order phase-field modeling of ductile fracture in elastic-plastic materials is conducted using an adaptive isogeometric-meshfree approach. The developed model includes the elastic contribution and the dissipated contribution due to fracture and plasticity in the total energy functional. The coupling between plasticity and fracture is achieved through a degradation function applied to the elastic energy. The model is capable of accurately regularizing sharp cracks while relaxing the mesh size requirements.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Physics, Applied
Gang-Gang Xu, Xiao-Wei Sun, Xiao-Dong Wen, Xi-Xuan Liu, Ting Song, Zi-Jiang Liu
Summary: This study uses a pair of triangular prisms to construct hexagonal-lattice phononic crystal plates that mimic the dual-band elastic valley Hall effect. Based on spatial inversion symmetry conditions, the relationship between the resonance frequencies of the resonators and the valley degeneracies, topological nontrivial bandgaps, and energy band inversion characteristics of multiple resonance modes is investigated. Edge passbands with distinct topology phases exist in each of the two nontrivial bandgaps of the ribbon configuration. This work provides a reference for valley edge protection in subwavelength continuous elastic plate media and for the manipulation of elastic waves at multiple frequencies.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Ning Li, Jun-Hong Tian, Ting Song, Lie-Juan Li, Zi-Jiang Liu, Xiao-Wei Sun
Summary: The effects of In, Sn, and Sb alloying in PbH4 on the superconductivity at high pressure were investigated using first-principles calculations. The alloying structures exhibited thermodynamical, mechanical, and dynamic stability, as indicated by the calculated formation enthalpy, elastic constants, and phonon dispersion. The superconductivity of Pb2MH12 (M = In, Sn, and Sb) was improved by the addition of M. The superconducting transition temperature increased from 62 K for PbH4 to 70, 69, and 66 K for Pb2MH12 (M = In, Sn, and Sb), respectively. Electronic structure and electron-phonon coupling calculations showed an increase in the contribution of H atoms to the density of states at the Fermi energy and enhancement of the strength of electron-phonon coupling. The results suggest that alloying lighter elements with lower electronegativity is an effective method to improve superconducting properties.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Physics, Condensed Matter
Yuri D. Glinka, Tingchao He, Xiao Wei Sun
Summary: Separate relaxation dynamics of long-lived holes in Bi2Se3 film were observed at room temperature using transient absorption spectroscopy. The ultraslow dynamics and long rise time are attributed to the resonance conditions for multiphoton photoemission and the intervalley scattering in the film. The dynamics of massive Dirac fermions predominantly determines the relaxation of photoexcited carriers.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Xin-Wei Wang, Xiao-Wei Sun, Ting Song, Jun -Hong Tian, Zi-Jiang Liu
Summary: A comprehensive investigation of the melting curve and P-T phase diagram of CaO, a candidate mineral in the Earth's lower mantle, is conducted through atomistic simulations using newly developed interatomic potentials. The efficiency and reliability of the new potentials under high temperature and pressure are verified. The study also explores the structure, diffusion, and other physical properties of CaO.
Article
Engineering, Mechanical
Zhi Hui Koh, Kaijuan Chen, Hejun Du, Jun Zeng, Kun Zhou
Summary: Multi-Jet-Fusion (MJF) is a promising powder-based additive manufacturing technique for high-volume manufacturing. This study investigated the physical and mechanical properties of MJF-printed polyamide 12 (MJF PA12) specimens under different storage conditions and build orientations. The findings revealed that moisture absorption led to a decrease in glass transition temperature in specimens stored under ambient conditions, indicating aging. The change in mechanical properties was more significant for ambient-stored specimens, and build orientation had no significant impact on moisture absorption and mechanical properties. An artificial neural network was also used to predict the mechanical properties of MJF PA12 specimens under the influence of physical aging, humidity, and build orientations, which could assist in structure and risk assessment before printing.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
