Article
Chemistry, Physical
Junliang Zhang, Shuyi Ma, Bingji Wang, Shitu Pei
Summary: The SnO2-CuO composite nanoparticles fabricated as an ethanol gas sensor exhibit excellent sensitivity and selectivity to ethanol, with short response recovery time and good linear relationship between response value and ethanol concentration, mainly due to the special heterostructure and synergistic effect between tin oxide and copper oxide.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
J. M. Liu, S. Y. Ma, W. W. Liu, C. Y. Xu, J. S. Wei, H. T. Jiang, M. M. Liu, N. N. Ma
Summary: As the understanding of metal oxide semiconductors deepens, their excellent sensing ability has been demonstrated. Gas sensors based on metal oxide semiconductors have become a hot topic, and enhancing sensitivity and reducing test limits are important tasks. This study synthesized one-dimensional YFeO3 nanorods by electrospinning technology and found that they exhibited excellent gas sensing performance, particularly towards ethanol. The study provides a technical reference for the preparation of high-performance ethanol sensors and enriches the materials category in the field of gas sensors.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Analytical
Dae-Hwan Kwon, Eui-Hyun Jin, Dae-Hwang Yoo, Jong-Wook Roh, Dongjun Suh, Walter Commerell, Jeung-Soo Huh
Summary: The sensing characteristics of toluene gas were monitored by fabricating ZnO nanorod structures, and the response of the sensors was improved by heat treatment.
Article
Chemistry, Analytical
E. Spagnoli, S. Krik, B. Fabbri, M. Valt, M. Ardit, A. Gaiardo, L. Vanzetti, M. Della Ciana, V Cristino, G. Vola, S. Caramori, C. Malagu, V Guidi
Summary: Tungsten oxide nanoflake powders were synthesized using solvothermal technique for ethanol sensing, showing good response to ethanol compared to other alcohols due to an interplay between the catalytic properties of the sensing film and gas diffusivity in a porous medium.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Shiyu Zhou, Wenjun Yan, Min Ling, Chengdu Liang
Summary: A facile solution reduction method was used to modulate the oxygen vacancies of ZnO nanosheets, resulting in enhanced hydrogen sensing properties with significantly reduced operating temperature (150 degrees C), higher response (around 38.2 for 200 ppm), lower limit of detection (55 ppb), and quick recovery speed (only 6 s). The increased molecule adsorption and narrower band gap generated by controlled oxygen vacancies contribute to the superior sensing properties. The oxygen vacancy engineering strategy of pure metal oxide semiconductor-based materials shows great potential for creating low-temperature high-response sensors.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Review
Chemistry, Inorganic & Nuclear
Chengming Lou, Guanglu Lei, Xianghong Liu, Jiayue Xie, Zishuo Li, Wei Zheng, Neeraj Goel, Mahesh Kumar, Jun Zhang
Summary: Formaldehyde sensors are crucial for indoor air quality monitoring and gas leakage detection in industrial areas. The development of high-performance formaldehyde sensors has been greatly facilitated by the research progress in metal oxide semiconductors (MOS) nanomaterials. This review summarizes the recent advances in formaldehyde sensors utilizing MOS nanostructures, emphasizing the structure-property relationships of various MOS types and discussing optimization strategies for sensor performances. The perspectives and challenges in the future development of formaldehyde sensors are also discussed.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Materials Science, Ceramics
Se-Hee Shin, Jae-Chul Ro, Su-Jeong Suh
Summary: Zinc oxide is widely used in gas sensors and photocatalysts due to its unique band structure and surface properties. In this study, we successfully synthesized organic-additive-free ZnO using hydrothermal synthesis method without surfactants. By controlling the concentrations ratio, we were able to control the morphology of the ZnO. Various characterization techniques were employed to understand the growth mechanism and surface properties of the ZnO. The flower-shaped ZnO material exhibited the best performance as a gas sensor.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Qi Zhang, Qian Ma, Xueying Wang, Yi Wang, Dongheng Zhao
Summary: In this study, a series of CeO2/WO2.9 composites with tunable structure and thickness were fabricated by innovating the addition of H2WO4 during the hydrothermal process. The optimal Ce/W-0.25 sensors showed a higher response value of 23.68 to 100 ppm n-butanol at room temperature compared to pure CeO2 (1.26) at 200 degrees C. The unique surface double oxygen defect engineering between CeO2 and WO2.9 played a significant role in gas sensing, the formation of the CeO2-WO2.9 heterojunction, and the effective surface/interface transport mechanism. The electron transfer between WO2.9 and CeO2 facilitated the interconversion between Ce3+ and Ce4+ driven by oxygen defects on the surface of CeO2. This work provides new insights and a facile fabrication pathway for developing novel n-butanol gas sensors with excellent sensing performance at room temperature.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Junliang Zhang, Shuyi Ma, Bingji Wang, Shitu Pei
Summary: The composite SnO2/CuO nanotubes were prepared by uniaxial electrospinning, which showed excellent selectivity for ethanol. The response value of ethanol had a good linear relationship with concentration, indicating potential for gas sensing applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Analytical
Leonardo Furst, Manuel Feliciano, Laercio Frare, Getulio Igrejas
Summary: This study presents a low-cost platform for measuring methane within a low concentration range, which was evaluated in different environments. The system proved capable of reliably measuring low methane concentrations, showing itself to be a good alternative as a screening monitoring system.
Article
Chemistry, Multidisciplinary
Xingtai Chen, Tao Liu, Zhaoru Li, Xi-Tao Yin
Summary: Gas sensors, especially metal oxide semiconductors, have been widely used in various fields, and modification methods such as special structures, doping, and precious metal loading can improve their gas-sensitive performance. This review summarizes the progress in the modification of metal oxides, including their response, selectivity, and operating temperature, and focuses on the gas-sensitive mechanisms. The bottlenecks and future development prospects of current metal oxide semiconductor n-Butanol gas sensors are also discussed.
MATERIALS TODAY CHEMISTRY
(2023)
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.
Review
Chemistry, Multidisciplinary
Xuanyu Yang, Yu Deng, Haitao Yang, Yaozu Liao, Xiaowei Cheng, Yidong Zou, Limin Wu, Yonghui Deng
Summary: With the emergence of the Internet of Things, chemiresistive gas sensors have been extensively applied in various fields such as industrial production, food safety, medical diagnosis, and environment detection. The performance of gas sensors has been improved through the tailoring of sensitive materials' structure, functions, defects, and electrical conductivity. Among these sensitive materials, mesoporous semiconductor metal oxides, with tunable pore size, high specific surface area, abundant metal-oxygen bonds, and rapid mass transfer behavior, have been considered as the most promising. This article provides an overview of the synthesis strategies for mesoporous metal oxides, summarizes the classical functionalization techniques of sensitive materials, discusses the structure-function relationship at the molecular-atomic level, and proposes challenges and future perspectives for the development of intelligent gas sensors.
Article
Chemistry, Multidisciplinary
Matshidiso P. Ramike, Patrick G. Ndungu, Messai A. Mamo
Summary: This study synthesized four different ZnO nanostructures with unique morphologies and electronic properties, which were then incorporated with carbon nanoparticles and cellulose acetate to create nanocomposites for solid-state sensors capable of detecting various vapors. The sensors' responses were influenced by the morphology of ZnO nanostructures, the mass ratio in the composites, and the type of analyte. Ethanol showed the best response among the analytes tested due to its enhanced electron-donating ability.
Article
Chemistry, Analytical
P. M. Desimone, F. Schipani, R. Procaccini, D. A. Mirabella, C. M. Aldao
Summary: The electrical conductance of gas sensors based on metal-oxide semi-conductors follows a power-law response with gas pressure. By observing the exponent γ for different gases, researchers can determine the possible species present at the surface and the reactions that can occur.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)