Novel Construction of Morphology-Tunable C–N/SnO2/ZnO/Au Microspheres with Ultrasensitivity and High Selectivity for Triethylamine under Various Temperature Detections

材料科学 煅烧 结晶度 选择性 三乙胺 静电纺丝 化学工程 形态学(生物学) 相(物质) 微观结构 微球 纳米技术 复合材料 催化作用 聚合物 有机化学 工程类 生物 化学 遗传学
作者
Hui Li,Shushu Chu,Qian Ma,Yuan Fang,Junpeng Wang,Quande Che,Gang Wang,Ping Yang
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:11 (8): 8601-8611 被引量:48
标识
DOI:10.1021/acsami.8b22357
摘要

Morphology-tunable C-N/SnO2-based hierarchical microspheres with good gas sensitivity for triethylamine (TEA) have been fabricated via facile electrospinning and a subsequent calcination process. The reaction temperature and modifying calcining technology played a dominant role for the morphological evolution from precursor fibers to microspherical shapes and the formation of C-N-decorated SnO2 phase composition. C-N/SnO2/ZnO composites with tunable crystallinity, microstructure, and gas-sensing performance were strictly dependent on the added amount of Zn element. Fascinatingly, the constructed C-N/SnO2/ZnO/Au composites can not only precisely regulate the crystal size, dispersion status, loading position, and content of Au nanoparticles but also display excellent gas-sensing properties with ultrasensitivity and high selectivity under various temperature detections. The response of C-N/SnO2/ZnO/Au composites can reach up to approximately 1970, calculated to be 121.6 and 23.6 times for 50 ppm TEA molecules at optimal conditions compared with C-N/SnO2 and C-N/SnO2/ZnO microspheres, respectively, actually representing the highest response value at high temperatures reported to date. The superior long-aging stability of sensing behaviors and phase structures can be also observed after 1 month. More importantly, novel C-N/SnO2/ZnO/Au sensors were employed for availably detecting low-concentration volatiles released from the storage procedure of fishes at 80 °C, indicating the practical application in chemical detectors and biosensors at low temperature. The novel gas-sensing mechanisms derived primarily from the combination of phase compositions, morphologies, and unique surface/interface transfer processes of C-N/SnO2/ZnO/Au composites are presented and investigated in detail, which will contribute to the design and development of other semiconductor-based composite sensors.
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