Journal ArticleDOI
NO2 sensing properties of one-pot-synthesized ZnO nanowires with Pd functionalization
Xiangxiang Chen,Yanbai Shen,Pengfei Zhou,Sikai Zhao,Xiangxi Zhong,Tingting Li,Cong Han,Dezhou Wei,Dan Meng +8 more
TLDR
In this article, a low-temperature and high-performance NO2 sensor based on Pd-functionalized ZnO nanowires (Pd-ZNWs) prepared by a facile one-pot hydrothermal method was reported.Abstract:
The application of NO2 sensor based on metal oxide semiconductor is limited due to high operating temperature and poor selectivity. In this work, a low-temperature and high-performance NO2 sensor based on Pd-functionalized ZnO nanowires (Pd-ZNWs) prepared by a facile one-pot hydrothermal method was reported. The Pd was formed and self-assembled onto the surface of ZnO nanowires (ZNWs) during this one-pot hydrothermal process. Microstructure characterization of Pd-ZNWs indicated that the obtained ZNWs with diameter of 100–250 nm and length of 2–10 μm had a single crystal hexagonal structure, and Pd/PdO nanoparticles of approximately 2–5 nm in diameter were distributed on their surface. Gas sensing measurement showed that Pd-ZNWs exhibited higher response, lower optimal operating temperature, and faster response/recovery speeds towards NO2 than those of pure ZNWs. The maximum responses of 1 mol%, 2 mol%, and 5 mol% Pd-ZNWs towards 1 ppm NO2 were 13.5, 9.4, and 9.4, respectively, which were obtained at a low operating temperature of 100 °C and 30% RH. Pd-ZNWs also showed a significant improvement in sensing selectivity towards NO2. At a high RH condition of 60%, the sensors based on pure and Pd-ZNWs still exhibited noticeable responses, fast response/recovery speeds, and good long-term stability to NO2 gas. The sensing mechanism of Pd-ZNWs towards NO2 was discussed by the combination of electronic and chemical sensitization.read more
Citations
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Enhanced sensing performance of ZnO nanostructures-based gas sensors: A review
TL;DR: In this paper, several techniques related to the synthesis of ZnO nanostructures and their efficient performance in sensing are reviewed, such as functionalization of noble metal nanoparticles, doping of metals, inclusion of carbonaceous nanomaterials, using nanocomposites of different MO x, UV activation, and post-treatment method of high-energy irradiation on ZnOs, with their possible sensing mechanisms.
Journal ArticleDOI
Design of Au@WO3 core−shell structured nanospheres for ppb-level NO2 sensing
TL;DR: In this paper, a novel structure of Au@WO3 core-shell nanospheres (CSNSs) was designed and successfully prepared for NO2 detection, and the results demonstrated that Au nanoparticles with 25-50nm in diameter were successfully encapsulated by WO3 shells with the thickness of 30-50 nm.
Journal ArticleDOI
Complex-surfactant-assisted hydrothermal synthesis of one-dimensional ZnO nanorods for high-performance ethanol gas sensor
Sikai Zhao,Yanbai Shen,Xiuxiu Yan,Pengfei Zhou,Yaoyu Yin,Rui Lu,Cong Han,Baoyu Cui,Dezhou Wei +8 more
TL;DR: One-dimensional (1D) ZnO nanorods were synthesized by a facile and effective hydrothermal method using the mixture of sodium dodecyl sulfate (SDS) and polyethylene glycol 400 (PEG400) with a molar ratio of 1:1 as the complex surfactant as mentioned in this paper.
Journal ArticleDOI
ZnO Nanostructures in Active Antibacterial Food Packaging: Preparation Methods, Antimicrobial Mechanisms, Safety Issues, Future Prospects, and Challenges
In Soo Kim,Karthika Viswanathan,Gopinath Kasi,Sarinthip Thanakkasaranee,Kambiz Sadeghi,Jongchul Seo +5 more
TL;DR: In this article, a nano-size materials for packing food substances with appropriate properties result in better packaging performance than conventional materials with similar properties, such as polyethylene and polypropylene.
Journal ArticleDOI
Highly sensitive and selective H2S gas sensors based on flower-like WO3/CuO composites operating at low/room temperature
TL;DR: In this article, a gas sensor was developed from a semiconductor composite structure composed of flower-like WO3 microspheres whose surface was modified with CuO nanoparticles, which exhibited high response, excellent selectivity and fast response to ppm-level H2S at low operating temperature of 80 °C.
References
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