2024年5月17日，Elsevier 旗下国际著名期刊《Sensors and Actuators B: Chemical》在线发表了云南师范大学能源与环境科学学院​申开远博士的最新研究成果《Engineering Hierarchical Heterostructure Material Based on Multiwalled Carbon Nanotubes/ SnO2 Nanorod-Flowers for High-Efficient Ammonia Detection》。云南师范大学能源与环境科学学院​申开远博士为通讯作者。合作单位为昆明理工大学Yanping Zhao、云南大学赵鹤云教授。

https://www.sciencedirect.com/science/article/abs/pii/S0925400524007238

Abstract

The rational manufacturing of multi-component materials with rich heterostructure is emerging as a possible strategy to develop improved carbon nanotube-based gas sensors. Herein, hierarchical heterostructure of multiwalled carbon nanotubes/SnO2 nanorod-flowers (HMCNS) was synthesized by a facile water-bathing combined hydrothermal approach for highly sensitive ammonia detection. Exploration in the microstructure reveals that hierarchical flowers-like SnO2 consisted of nanorods demonstrates a hollow geometry for wrapping multiwalled carbon nanotubes, featuring a unique three-dimensional (3D) hierarchical architecture. Gas sensor based on SnO2@4.5%CNTs hierarchical heterostructure exhibits highly enhanced ammonia-sensing performances, including ultra-high response of 1650 toward 20 ppm ammonia, good selectivity, 250 ppb level detection, and superior long-term stability. The improvement in ammonia sensing capability could be attributed to the peculiar hierarchical architecture and the creation of Mott-Schottky heterostructure which has been strongly validated by electrochemical research. This work will provide a concise and effective avenue to construct hierarchical composite with Mott-Schottky heterostructure for high-performance ammonia gas sensor.

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