Article
Chemistry, Multidisciplinary
Lun Tan, Xianzhen Liu, Peng Wu, Liwei Cao, Wei Li, Ang Li, Zhao Wang, Haoshuang Gu
Summary: The research and development of high-performance NH3 sensors is important for environment monitoring and disease diagnosis applications. TiO2-modified monolayer MoS2 films with controllable TiO2 loading contents were fabricated and showed enhanced room-temperature NH3 sensing performance. The TiO2/MoS2 system with 95% surface coverage of TiO2 exhibited improved sensor response, low detection limit, wide detection range, good repeatability, and superior selectivity against other gases. The TiO2 modification improved the surface reactivity of the sensing layers and acted as gas-gating layers to modulate the electron depletion layer and the conductivity of the MoS2 films, resulting in improved NH3 sensing performance. This n-n hetero-compositing strategy provides a simple and cost-effective approach for developing high-performance NH3 sensors based on 2D semiconductors.
Article
Chemistry, Physical
Zheng Wei, Jian Tang, Xuanyi Li, Zhen Chi, Yu Wang, Qinqin Wang, Bo Han, Na Li, Biying Huang, Jiawei Li, Hua Yu, Jiahao Yuan, Hailong Chen, Jiatao Sun, Lan Chen, Kehui Wu, Peng Gao, Congli He, Wei Yang, Dongxia Shi, Rong Yang, Guangyu Zhang
Summary: This study achieved uniform oxygen doping of wafer-scale monolayer MoS2 and found a reduction in bandgaps with increased oxygen-doping levels. Devices fabricated based on these doped MoS2 monolayers demonstrated excellent electronic performances, showing promise for their potential large-scale applications in electronics.
Article
Materials Science, Multidisciplinary
Qiao-Lu Lin, Zheng-Fang Qian, Xiang-Yu Dai, Yi-Ling Sun, Ren-Heng Wang
Summary: This study explores the tunability of the electronic structure of monolayer MoS2 under perpendicular pressure modes and shear stress. The band gap increases at low pressures and then decreases with increasing pressure. The variations in the band gap are caused by the combined interaction of increasing and decreasing trends. The band gap under different pressure modes is closely related to structural variations, resulting in anisotropic properties.
Article
Physics, Multidisciplinary
Shengjie Zhang, Yufei Pei, Shiqi Hu, Na Wu, Da-Qiang Chen, Chao Lian, Sheng Meng
Summary: Recent progress in the field of spin dynamics in materials under the influence of light includes ultrafast demagnetization, magnetic switching, and magnetic phase transitions. However, the ultrafast generation of magnetism has not been achieved until now. In this study, researchers discovered a strong light-induced magnetization in non-magnetic monolayer molybdenum disulfide, which can be induced by circularly polarized laser and chiral phonons. This study provides important insights into the ultrafast magnetization and spin-phonon coupling dynamics, which can be applied to light-controlled valleytronics and magnetism.
CHINESE PHYSICS LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Ran Wei, Guili Liu, Xuewen Gao, Jianlin He, Jingwei Zhao, Yuling Chen, Guoying Zhang
Summary: In this study, the electronic and optical properties of Cr-doped monolayer MoS2 under uniaxial tensile strain were investigated using first-principle calculations. It was found that uniaxial tensile strain could significantly alter the electronic and optical properties of Cr-doped monolayer MoS2, with the bandgap of the intrinsic MoS2 system decreasing gradually with increasing strain. However, the bandgap of the Cr-doped MoS2 system remained relatively stable. The analysis of density of states showed that new electronic states and energy levels appeared in both the intrinsic MoS2 and doped systems with increasing tensile strain.
JOURNAL OF MOLECULAR MODELING
(2023)
Article
Chemistry, Multidisciplinary
Huili Li, Ling Fu, Chaozheng He, Jinrong Huo, Houyong Yang, Tingyue Xie, Guozheng Zhao, Guohui Dong
Summary: The adsorption behavior of H2CO on original and Zn-doped monolayer MoS2 was studied using density functional theory. The results showed weak adsorption on original monolayer MoS2 and the formation of a new surface catalyst with high selectivity on Zn-doped monolayer MoS2. Adsorption on Zn-doped monolayer MoS2 exhibited different energy levels and effects on electronic structure based on the orientation of the H2CO molecule.
FRONTIERS IN CHEMISTRY
(2021)
Article
Biochemical Research Methods
Tengfei Wang, Xiaolei Li, Lu Li, Dong Li
Summary: This study investigated the adsorption behaviors of five small gas molecules (NO, NO2, CO, CO2 and H2O) on noble metal (Ag, Au and Pt) - decorated black arsenic phosphorous (alpha-AsP) using first-principles calculation. The results showed that noble metal decoration significantly enhanced the adsorption ability of alpha-AsP, with Pt-decorated AsP exhibiting the highest adsorption energy for CO and NO. Ag-decorated AsP was found to be a potential sensor material for NO and CO gases.
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
(2022)
Article
Chemistry, Multidisciplinary
Connor J. McClellan, Eilam Yalon, Kirby K. H. Smithe, Saurabh Suryavanshi, Eric Pop
Summary: This study demonstrates a method of low-temperature substoichiometric AlOx doping for monolayer MoS2, achieving high carrier densities and low sheet resistance in transistors. The doped MoS2 devices approach several low-power transistor metrics required by the international technology roadmap, making them promising for future semiconductor applications.
Article
Chemistry, Physical
Qichao Li, Di Chen, Yamin Liu, Jianmin Miao, Chunlei Zhang, Xianping Chen, Daxiang Cui
Summary: In this study, Ru-doped AlN monolayers were investigated for the detection and elimination of SF6 decomposition gases. Two doping strategies, Ru adatom and Ru substitution, were studied and named Ru-AlN-A and Ru-AlN-S, respectively. It was found that Ru-AlN-A can selectively sense and scavenge SO2, SOF2, and SO2F2, while Ru-AlN-S is sensitive to SO2 and SOF2 due to strong adsorption energies.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Shulin Yang, Xueting Wang, Gu Lei, Huoxi Xu, Zhao Wang, Juan Xiong, Haoshuang Gu
Summary: The study demonstrates that the MoS2 monolayer decorated with Ti atoms has the potential to effectively store hydrogen molecules, with the ability to adsorb hydrogen molecules efficiently and achieve high-density storage, making it a promising candidate for an excellent hydrogen gas sensor.
SURFACES AND INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
I Castillo, T. Sohier, M. Paillet, D. Cakiroglu, C. Consejo, C. Wen, F. Wasem Klein, M-Q Zhao, A. Ouerghi, S. Contreras, A. T. Charlie Johnson, M. J. Verstraete, B. Jouault, S. Nanot
Summary: We performed transport measurements in monolayer MoS2 devices close to the bottom of the conduction band edge. The measured effective mobility is one of the highest among CVD-grown MoS2 monolayer devices. The electronic transport in the insulating regime is dominated by thermally activated transport at high temperature and Efros-Schklovkii variable range hopping at lower temperatures.
Article
Chemistry, Analytical
Tri Khoa Nguyen, Sangmin Jeong, Jong-Sang Youn, Seungbae Ahn, Ki-Hun Nam, Cheol-Min Park, Ki-Joon Jeon
Summary: This study investigates the performance of MoS2-based gas sensors at different temperatures, revealing that the sensor has better response and detection limit at higher temperatures. However, it is also found that there are line damages on the sensor at 200 degrees Celsius, affecting its recovery ability.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Physical
Weiping Deng, Zongjun Tian, Deqiao Xie, Lida Shen, Yang Yang
Summary: This study improves the surface defect of MoS2 nanomaterial by doping sulfur atoms, leading to enhanced conductivity and gas adsorption performance, especially in terms of selectivity towards Ru2O4.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Li Yang, Jinjie Liu, Yanwen Lin, Ke Xu, Xuezheng Cao, Zhisen Zhang, Jianyang Wu
Summary: Dislocations in the form of pentagon-heptagon pairs in grain boundaries have a significant impact on the mechanical properties of MoS2 crystals, depending on the tilt angle and dislocation arrangement. This study provides insights into the mechanical design of synthetic transition metal dichalcogenide crystals through dislocation engineering.
CHEMISTRY OF MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Liang-Yan Guo, Sheng-Yuan Xia, Yunfeng Long, Zhirong Peng, Yaxiong Tan, Tianyan Jiang, Zhengyong Huang
Summary: This study investigated the gas-sensing response characteristics of P-BN monolayers to SF6 decomposition gases and demonstrated their good selectivity and high sensitivity to SO2 F2 and SOF2 gas molecules.
IEEE SENSORS JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Ping Zhang, Xiujie Yue, Yeran Gao, Zhenyong Lin, Shunxiang Wang, Songting Zhang
Summary: This paper investigates the strengthening mechanism of highspeed cutting and solid particle-entrained waterjet peening (HSC-WJP) composite reinforcement on 7075-T6 aluminum alloy. The research results show that composite reinforcement can improve surface quality, reduce surface pits and roughness, and decrease the size of precipitation-free zone (PFZ) at grain boundaries.
Article
Materials Science, Multidisciplinary
Sangyoon Lee, Hwi Yoon, Sanghun Lee, Seung-min Chung, Hyungjun Kim
Summary: The wettability of metal oxides, particularly HfO2 thin films deposited via atomic layer deposition, and its correlation with surface free energy have been studied. It was found that surface oxygen species significantly affect the intrinsic hydrophilicity of HfO2 thin films, and the crystalline orientations also evolve with film thickness.
Article
Materials Science, Multidisciplinary
Changdong Yin, Yiwen Wu, Zhou Xu, Dongdong Ye, Jun Yao, Jianjun Chen, Qiang Liu, Xin Ge, Meiling Ding
Summary: This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Article
Materials Science, Multidisciplinary
Huan Luo, Wei-yi Wang, Xin Yu, Xian-jun Lei, Lang Liu, Guo-zheng Zha, Wen-long Jiang, Bin Yang, Bao-qiang Xu
Summary: Separating selenium and tellurium is a general challenge in material and non-ferrous metallurgical industries. This paper proposes a novel method that achieved efficient separation of selenium and tellurium using gas-liquid equilibrium phase diagram and valence regulation-vacuum gasification technique.
Article
Materials Science, Multidisciplinary
Fan Zhang, Rong Xin Wang, Aiqin Tian, Fangzhi Li, Jianping Liu, Hui Yang
Summary: Deposition of Pd/Pt/Au three-layer films on p-GaN under high and ultra-high vacuum conditions was studied to investigate the electrical contact properties. Linear I-V curves were observed in samples deposited under ultra-high vacuum conditions, while nonlinear I-V characteristics were obtained in samples deposited under high vacuum conditions. The study also found that the samples deposited under high vacuum conditions had higher amounts of oxygen and Pd oxide. The oxide layer had an additional influence on the electrical characteristics of the Pd/Pt/Au/p-GaN contact.
Article
Materials Science, Multidisciplinary
Hongli Liu, Chengzhe Liu, Ying Sui, Zhongxian Liu, Tiangang Zhang, Zhiqiang Zhang, Shuang Sun, Jianwei Jia
Summary: This study utilized polysiloxane and hafnium carbide to produce Si-N-C-O-Hf hybridized ceramic fibers, and obtained ceramic fibers with hemispherical particles on the surface through electrostatic spinning and pyrolysis. The ceramic fibers exhibited excellent thermal stability, oxidation resistance, and high temperature insulation.
Article
Materials Science, Multidisciplinary
M. Abaker, Nazar Elamin Ahmed, A. Saad, H. F. Khalil, E. M. M. Ibrahim, A. M. Adam
Summary: This paper systematically studied the internal structure and thermoelectric properties of In1-xGaxSb alloys prepared by melting synthesis at 1123 K. The results showed that doping with Ga in the In sites led to a significant increase in the Seebeck coefficient and power factor, while reducing the thermal conductivity. The maximum dimensionless figure of merit was observed at 403 K.
Article
Materials Science, Multidisciplinary
Fucheng Yu, Jinlong Ren, Jielin Zhang, Haiyang Chen, Xin Tian, Chenchen Feng, Cuixia Li, Jianbin Zhang, Xianxi Tang, Xiaogang Hou
Summary: An environmentally friendly ZnO@BiVO4 composite photocatalyst was prepared using in-situ self-assembly and solvothermal methods, demonstrating good photocatalytic performance. The mass ratio of BiVO4 and NCZ was found to influence the photocatalytic performance of the composite.
Article
Materials Science, Multidisciplinary
Yaoming Shao, Pingping Zheng, Tianhao Dong, Lianghuan Wei, Haifei Wu, Jianxiao Si
Summary: In this paper, Mg3Bi2 films were prepared on glass substrate using magnetron sputtering, and the phase composition and thermoelectric properties of the films were investigated with different atomic ratios. The films displayed a metastable cubic phase and high conductivity when the atomic ratio exceeded stoichiometry.
Article
Materials Science, Multidisciplinary
I. V. Uimanov, D. L. Shmelev, S. A. Barengolts
Summary: A two-dimensional axisymmetric model has been developed to study the prebreakdown processes in a cathode microprotrusion under an external electric field. The simulation results show that electrohydrodynamic instability leads to the formation of a nanometer-sized conical protrusion on the microprotrusion tip, significantly accelerating the heating process.
Article
Materials Science, Multidisciplinary
Weilun Zhang, Di Yang, Feng Gong, Yongjun Chen, Tian Chen, Zhiwen Xie, Sirui Yang
Summary: A novel Pt doping method was designed to improve the thermal stability of CrWN coating. The doping of Pt atoms effectively blocks the coherent growth of the grains and creates a significant mixing effect, resulting in a smooth surface with uniform element distribution.
Article
Materials Science, Multidisciplinary
Xiaoye Wang, Xiaoguang Yang, Wenna Du, Tao Yang
Summary: In this study, the effects of multiple growth parameters on self-catalyzed growth of InAs/GaSb axial heterostructured nanowires on Si substrate by MOCVD were investigated. It was found that the growth temperature and switching time have significant influences on the nanowire growth.
Article
Materials Science, Multidisciplinary
Weizhong Cui, Yan Zhao, Can Cui, Xing Liu, Beili Pang, Jianguang Feng, Hongzhou Dong, Liyan Yu, Lifeng Dong
Summary: This study introduces Co2+ cations into Cs2AgBiBr6 film to improve its quality, grain size, and conductivity, resulting in enhanced solar cell efficiency.
Article
Materials Science, Multidisciplinary
Jian Wang, Ke Yang, Xianming Cheng, Yalin Lu, Ganghui Wu, Yang Zhang, Yun Kan
Summary: The corrosion behavior and microstructural evolution of Sc microalloyed Al-3.2Cu-1.5Li alloys were investigated in detail. The microstructural results showed higher levels of dislocations density in the Sc microalloyed sample, which resulted in significantly refined grains and T1 precipitates. Microalloying with Sc changed the corrosion mode of the alloy and localized corrosion was found to occur preferentially at the subgrain within unrecrystallized grains with high grain stored energy.
Article
Materials Science, Multidisciplinary
Weifeng Liu, Na Liu, Kaiqiang Song, Meiqin Zeng, Zhongchen Lu
Summary: Monoclinic WO3 prepared through plasma milling exhibits higher photocatalytic activity due to its higher surface area, increased oxygen vacancies, and defects.