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一种基于负载铂纳米粒子的WO/TiO纳米晶体的高性能室温氨气传感器。

A high-performance room-temperature NH gas sensor based on WO/TiO nanocrystals decorated with Pt NPs.

作者信息

Wu Zhixuan, Chen Zhengai, Deng Zhixiang, Dai Ning, Sun Yan, Ge Meiying

机构信息

School of Physical Science and Technology, ShanghaiTech University Shanghai 201210 China

State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences Shanghai 200083 China

出版信息

RSC Adv. 2024 Apr 16;14(17):12225-12234. doi: 10.1039/d4ra00881b. eCollection 2024 Apr 10.

DOI:10.1039/d4ra00881b
PMID:38628481
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11019483/
Abstract

In this work, a high-performance room-temperature ammonia (NH) gas sensor based on Pt-modified WO-TiO nanocrystals was synthesized a two-step hydrothermal method. The structural properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The 10 at% Pt@WO-TiO nanocrystals present the highest NH sensing performance at room temperature. Compared with the nanocrystals without Pt modification, the sensitivity of the Pt@WO-TiO sensor is tenfold higher, with the lowest concentration threshold reaching the 75 ppb level. The response is approximately 92.28 to 50 ppm, and response and recovery times are 23 s and 8 s, respectively. The improved sensing was attributed to a synergetic mechanism involving the space charge layer effect and Pt metal sensitization, enhancing the electron transfer efficiency, oxygen vacancy and specific surface area. This study is expected to guide the development of high-performance room-temperature ammonia sensors for clinical breath testing.

摘要

在这项工作中，采用两步水热法合成了一种基于铂修饰的WO-TiO纳米晶体的高性能室温氨气（NH）气体传感器。通过扫描电子显微镜、透射电子显微镜、X射线衍射和X射线光电子能谱对其结构性能进行了表征。10原子百分比的Pt@WO-TiO纳米晶体在室温下表现出最高的NH传感性能。与未进行铂修饰的纳米晶体相比，Pt@WO-TiO传感器的灵敏度高出十倍，最低浓度阈值达到75 ppb水平。对50 ppm的响应约为92.28，响应时间和恢复时间分别为23秒和8秒。传感性能的改善归因于一种协同机制，该机制涉及空间电荷层效应和铂金属敏化，提高了电子转移效率、氧空位和比表面积。这项研究有望指导用于临床呼气测试的高性能室温氨气传感器的开发。

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Nanotechnology. 2023 Mar 1;34(20). doi: 10.1088/1361-6528/acbbd2.
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Advances in functional guest materials for resistive gas sensors.用于电阻式气体传感器的功能性客体材料的进展
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