Article
Chemistry, Multidisciplinary
Ligang Ma, Xiaoqian Ai, Yujie Chen, Pengpeng Liu, Chao Lin, Kehong Lu, Wenjun Jiang, Jiaen Wu, Xiang Song
Summary: In this study, ZnO/NiO nanocomposites were successfully fabricated by constructing pn heterojunction. The nanocomposites exhibited excellent photocatalytic activity at 550 degrees C. The results showed that the heterojunction interface between n-type ZnO and p-type NiO played a crucial role in impeding the recombination of photogenerated electron-hole pairs and improving photocatalytic efficiency.
Article
Chemistry, Physical
Guantong Liu, Hongbiao Liu, Tongtong Yue, Wei Feng
Summary: Novel human hair template templated layered ZnO gas-sensing nanotube materials (CT NiO/ZnO) were synthesized using a biotemplate approach. The materials exhibited a hollow tubular structure composed of hexagonal wurtzite ZnO and cubic NiO. Gas sensitivity tests showed that CT NiO/ZnO had excellent gas sensitivity and selectivity, with a significant response to n-butanol compared to other vapors.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Bhuvaneswari Selvaraj, John Bosco Balaguru Rayappan, K. Jayanth Babu
Summary: Breath biomarker detection holds great potential for non-invasive monitoring of health factors and facilitating referrals, with room temperature non-invasive metal oxide semiconductor-based sensors playing a significant role in ailment detection. This study prepared ZnO/NiO nanocomposites of different ratios via the electrospinning process and investigated their acetone sensing characteristics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Sikai Zhao, Yanbai Shen, Fulai Hao, Changke Kang, Baoyu Cui, Dezhou Wei, Fanli Meng
Summary: CuO-ZnO p-n junctions were constructed by precipitating CuO nanoparticles on the surface of ZnO nanowires, resulting in an enhancement of gas sensing performance, specifically in ethanol sensing. The distinct sensing behaviors of the sensors were discussed in relation to several factors and considerations.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yuanyi Zhang, Xia Xin, Hui Sun, Qianru Liu, Jinniu Zhang, Gang Li, Jianzhi Gao, Hongbing Lu, Chunlan Wang
Summary: The porous ZnO-SnO2-Zn2SnO4 heterojunction nanofibers were prepared using electrospinning and high ramp rate heat treatment, showing significantly enhanced ethanol sensing capabilities under UV light irradiation. The response of ZnO-SnO2-Zn2SnO4 nanofibers to ethanol was much higher than that of pure Zn2SnO4 nanofibers, and remained effective even in high humidity conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Javier Bartolome, Maria Taeno, Ruth Martinez-Casado, David Maestre, Ana Cremades
Summary: Conductometric gas sensors based on metal oxide semiconductors often require high temperature operation, but this study focuses on room temperature operation of p-type NiO ceramic samples in response to ethanol. An anomalous response with fast response and recovery times is observed when the samples are synthesized at different temperatures, and a model is proposed to explain this unexpected resistance decrease upon ethanol exposure. This model could potentially lead to the development of fast sensors operating at room temperature for other MOS systems.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Haili Huang, Zhentao Du, Hung-Chun Wu, Fengmei Gao, Lan Jiang, Huilin Hou, Shanliang Chen, Weijun Li, Feng Hu, Weiyou Yang, Dongdong Zhang, Lin Wang
Summary: In this study, a high-temperature resistant ethanol sensor based on rationally designed heterojunctions is constructed, exhibiting significantly improved performance in sensing ethanol at 465 degrees C. The sensor demonstrates high response, fast detection, and excellent selectivity, suggesting promising applications for stable sensors operating under harsh working conditions.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Analytical
Jinmei Tian, Bin Jiang, Hong Shao, Yuting Wang, Tianqi Wang, Feng Li, Dan Li, Ying Yang, Xiangting Dong
Summary: In this study, one-dimensional tandem heterojunctions of SnO2 @POMs@WO3 nanofibers were prepared using coaxial electrospinning, and the gas sensing performance was significantly improved compared to SnO2 @WO3 nanofibers. The optimized response to 100 ppm ethanol reached 8.8, providing a new strategy for developing high-performance gas sensors through synthesizing one-dimensional tandem heterojunctions and introducing POMs.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Changhyun Jin, Myung Sik Choi, Kyu Hyoung Lee, Sun-Woo Choi
Summary: Gas sensors based on p-type NiO/n-type ZnO composite nanofibers were fabricated in this work, showing selective detection of oxidizing and reducing gas molecules. By adjusting the composition ratio of NiO/ZnO, the composite nanofibers demonstrated different sensing performances for oxidizing and reducing gases, with 0.5NiO-0.5ZnO NFs exhibiting strong response to oxidizing gases and 0.8NiO-0.2ZnO NFs showing good selectivity for reducing gases.
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
Materials Science, Multidisciplinary
Zhi-Da Hu, Xi-Yu Sun, Hang-Fei Li, Ya-Ru Kang, Xian-Qiang Song, Peng Wang, Qiao-Tong Luan, Xue-Dong Wang, Zong-Tao Chi, Wan-Feng Xie
Summary: Metal sulfide nanomaterials, especially cobalt monosulfide nanofibers, were successfully synthesized with uniform shape and good crystallinity, exhibiting excellent ethanol sensing properties, short response and recovery times, and good stability for potential sensor applications.
Article
Chemistry, Physical
Sikai Zhao, Yanbai Shen, Yong Xia, Aifei Pan, Zhou Li, Carlo Carraro, Roya Maboudian
Summary: In this study, NiO/ZnO heterostructured nanowires were synthesized using a two-step liquid phase route, and their gas sensing characteristics were investigated. The sensors showed high sensitivity and stability at the optimum operating temperature of 300 degrees C.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Jun-Dar Hwang, Meng-Chi Lin
Summary: Due to the small valence band discontinuity at NiO/Si interface, the p-NiO/n-Si heterojunction photodiodes have poor UV detection. However, by sandwiching a ZnO layer between p-NiO and n-Si, the UV response is largely enhanced due to the large valence band discontinuity at ZnO/Si interface. The ZnO layer also suppresses the dark current and increases the detectivity of the photodiodes.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Multidisciplinary
Ziqiao Jiang, Ce Wang, Zhenglong Yang
Summary: We report a high-performance gas sensing strategy for the selective detection of Listeria monocytogenes, which is realized using n-CdO/n-SnO2 hetero-nanofibers with controllable compositions. The CdO/SnO2 nanofibers show enhanced 3H-2B sensing properties due to the modulation of n-CdO/n-SnO2 heterojunctions and the doping effect of Cd2+ ions. The variation of Cd/Sn molar ratios significantly affects the sensing performance, and 5 mol% CdO/SnO2 nanofibers exhibit the best response to 5 ppm 3H-2B at 260 degrees C, along with excellent stability and selectivity.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Materials Science, Ceramics
Jun-Dar Hwang, Yan-Jhong Chiou, Wei-En Zeng
Summary: The NAN TCE exhibits higher transmittance but higher sheet resistance compared to the Al electrode in p-Si/n-ZnO HPDs, enhancing the photo response for UV and visible bands. The Ni diffusion in ZnO of NAN TCE suppresses defects and increases carrier mobility, leading to improved performance with significantly lower dark current and higher photo to dark current ratios.
CERAMICS INTERNATIONAL
(2021)
