MIL-125(Ti)-derived rutile phase TiO2 achieves highly sensitive detection and mechanism study of n-amylamine

文献类型： 外文期刊

第一作者： Guo, Chuanyu

作者： Guo, Chuanyu;Yang, Baoquan;Xin, Yuying;Meng, Huiyuan;Cheng, Xiaoli;Xiao, Xudong;Xu, Yingming;Yang, Baoquan;Meng, Huiyuan

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关键词： MIL-125; Gas sensor; n-Amylamine detection; Mechanism study

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 505 卷

页码：

收录情况： SCI

摘要： TiO2 gas sensors are commonly used for detecting Volatile Organic Compounds (VOCs) among various gas sensing materials. However, most current research focuses on the anatase phase of TiO2, with limited research on gas sensing using the rutile phase of TiO2, which has better chemical and thermal stability and different crystal structures. The selectivity and performance of TiO2 gas sensors have been a challenge to be improved. Currently, new synthesis methods are explored to prepare TiO2 with regular morphology and large surface area, which is a promising approach. In this work, MIL-125(Ti) was synthesized by the solvothermal method, followed by the synthesis of rutile phase TiO2 after calcination at 650 degrees C. The n-amylamine (n-Amy) gas was successfully detected for the first time. At 150 degrees C, the sensor showed a good response (Ra/Rg = 88) and a short response time (6 s) to 100 ppm n-Amy. In addition, the sensor showed good stability and moisture resistance. This excellent sensing performance mainly depends on the porous structure retained after MIL-125(Ti) calcination, the large specific surface area and the excellent adsorption capacity of n-Amy by rutile phase TiO2. Importantly, dynamic testing, in-situ Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and gas chromatography-mass spectrometry (GC-MS) to study the detailed sensitivity mechanism of the sensor to n-Amy gas for the first time.

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