Article
Materials Science, Multidisciplinary
Stuti Srivastava, Amit Kumar Gangwar, Ashwani Kumar, Govind Gupta, Preetam Singh
Summary: We investigated the H2S gas sensing performance of nanocrystalline NiO thin films sputtered on an alumina substrate by RF magnetron sputtering. The films exhibited a granular morphology and hydrophobic nature (-123.5 degrees contact angle). Oxygen or nickel vacancies/defects were observed based on the PL spectrum and confirmed by XPS measurements. The NiO thin films showed high sensitivity, selectivity, and stability towards H2S gas, with a detection limit of 135 ppb and a maximum sensor response (Rg/Ra) of -28.8 for 200 ppm H2S gas at 400 degrees C.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Environmental Sciences
Sunil Babu Eadi, Hyun-Jin Shin, P. Senthil Kumar, Ki-Woo Song, R. Yuvakkumar, Hi-Deok Lee
Summary: Gas sensors fabricated using F-doped IGZO thin films exhibited high sensitivity and selectivity to NO2 gas, with stable performance observed over a 2-week period.
Article
Chemistry, Analytical
Chuanxin Ge, Chuanchuan Jin, Mingsong Wang, Ling Bai, Shahid Hussain, Guanjun Qiao, Eui Jung Kim, Guiwu Liu
Summary: In this study, the on-chip preparation of SnO2 nanoarrays with porous netlike structure was achieved using in-situ grown NiO nanoarrays as the template. The as-prepared SnO2 nanoarrays exhibited excellent selectivity, stability, and linear response to H2S. The nanoarrays showed higher and faster H2S response compared to the dense film counterpart due to their porous net-like microstructure. A portable sensor device based on SnO2 nanoarrays was fabricated for accurate H2S detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Materials Science, Multidisciplinary
K. G. Girija, Ramana Kumar, A. K. Debnath
Summary: Material and synthesis compatibilities are crucial for integrated sensor systems. Zinc oxide (ZnO) is a promising material for gas-sensing applications due to its properties and compatibility with silicon fabrication technology. This study presents enhanced H2S response in nitrogen-doped ZnO (NZO) thin films achieved through controlled Ar:N-2 ratio. The films exhibited vertically oriented nanograins with high crystallinity, and the maximum response was achieved at an operating temperature of 300 degrees C with an Ar:N-2 ratio of 2:1.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Timofei Goncharov, Abulkosim Nasriddinov, Anastasia Zubenko, Sergey Tokarev, Tatyana Shatalova, Nikolay Khmelevsky, Olga Fedorova, Marina Rumyantseva
Summary: This paper presents a comparative analysis of H2S sensor properties of nanocrystalline SnO2 modified with different Ag materials, showing that composite materials based on Ag(I) organometallic complexes can enhance the selective detection of H2S. The results suggest that the structure of the modifier and the chemical state of silver are the key factors influencing sensor properties and selectivity toward H2S.
Article
Chemistry, Analytical
Kseniya Prikhodko, Abulkosim Nasriddinov, Svetlana Vladimirova, Marina Rumyantseva, Alexander Gaskov
Summary: In this study, p-type oxide semiconductors Co3O4 and complex oxides NixCo3-xO4 (x = 0.04, 0.07, 0.1) were investigated for sub-ppm H2S sensing in dry and humid air. The sensor signal decreased with increasing Ni content due to a decrease in chemisorbed surface oxygen species, while it increased with rising relative humidity, indicating better surface regeneration and reactivity of surface hydroxyl groups.
Article
Chemistry, Physical
Umesh T. Nakate, Priyanuj Bhuyan, Y. T. Yu, Sungjune Park
Summary: High-quality p-type semiconducting Co3O4 nanoparticles/nanorods with mixed morphology were synthesized for high-performance H2S sensor application. The crystal structure, morphology, and elemental composition of Co3O4 were analyzed, and the gas sensing properties, stability, and sensing mechanism of the sensor were investigated.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Electrical & Electronic
Jianbo Sun, Haixue Zhang, Xin Liu, Jinchun Tu
Summary: In this study, porous CdSnO3 nanocubes were synthesized using a water bath reaction and calcination. The gas sensing studies showed that CdSnO3 exhibited high response to H2S at 220 degrees C, and the synthesis strategy (pH value) also influenced its gas selectivity.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Analytical
Aihua Yu, Zhou Li, Jianxin Yi
Summary: This study presents a strategy for synthesizing Pt-functionalized ZnO nanorod arrays for detecting ppb-level H2S gas, showing high sensitivity and selectivity. The enhanced sensing performance can be attributed to the catalytic and electronic promotion effects of Pt and the unique morphology of nanorods.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
R. R. Powar, V. G. Parale, V. D. Phadtare, S. B. Wategaonkar, R. K. Mane, J. L. Gunjkar, D. R. Patil, P. B. Piste, H-H Park, D. N. Zambare
Summary: This study investigated the properties and gas sensing performance of Zn-substituted cobalt ferrite thick films. The results showed that flake-like ZCF sensors exhibited high response and selectivity to ethanol gas, indicating potential applications at room temperature.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Wenjian Zhang, Xukun Wang, Ziye Fan, Juan Li, Guo Liu, Xueliang Lv, Bingsheng Li, Jinyuan Zhou, Erqing Xie, Zhenxing Zhang
Summary: A CuO nanotube/In2S3 nanosheet p/n heterostructure gas sensor was designed with a high response to H2S gas. The sensor showed a switching effect of the response based on H2S concentration, with a surface-type adsorption-desorption process dominating at low concentrations and a superior response at high concentrations. This improvement in response was attributed to the transformed junction from CuO/In2S3 heterojunction to CuS/In2S3 Schottky junction.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Junqiang Bao, Ziyi Zhang, Yangong Zheng
Summary: Two-dimensional MoO3 nanoflakes were successfully synthesized and used in a high-performance gas sensor at high temperature. The sensor exhibited high resistance to humidity and employed a novel sensing mechanism based on the transition between sulfidation and oxidation.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Environmental
Qingqing Zhou, Lin Xu, Zitong Kan, Long Yang, Zhiyong Chang, Biao Dong, Xue Bai, Geyu Lu, Hongwei Song
Summary: The study developed sensors by combining a 3D inverse opal ZnO substrate with a ZIF-8 outer filter membrane, resulting in high response and selectivity towards H2S, with the optimal sensor exhibiting great performance against interference gases.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Analytical
Stefan Dietrich, Mihails Kusnezoff, Uwe Petasch, Alexander Michaelis
Summary: The study found that indium tin oxide surfaces are covered with water-related and carbonaceous adsorbates, with carbon monoxide exacerbating this situation. Therefore, when using indium tin oxide for gas sensing applications, the operating temperature should be carefully selected to ensure sensitivity to target gases.
Article
Nanoscience & Nanotechnology
Angelika Kaiser, Erick Torres Ceja, Yujia Liu, Florian Huber, Raphael Mueller, Ulrich Herr, Klaus Thonke
Summary: This study presents a H2S selective gas sensor design using ChemFET with ZnO NWs as the open gate. The sensor shows enhanced performance in detecting H2S after functionalizing with Au nanoparticle films, enabling detection of very low concentrations of H2S at room temperature.
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.