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溶胶-凝胶法制备的CaCuTiO陶瓷的选择性NO检测及漫反射红外傅里叶变换光谱测量以阐明气敏机理

Selective NO Detection of CaCuTiO Ceramic Prepared by the Sol-Gel Technique and DRIFT Measurements to Elucidate the Gas Sensing Mechanism.

作者信息

Espinoza-González Rodrigo, Caamaño Josefa, Castillo Ximena, Orlandi Marcelo O, Felix Anderson A, Flores Marcos, Blanco Adriana, Castro-Castillo Carmen, Gracia Francisco

机构信息

LabMAM, Department of Chemical Engineering, Biotechnology and Materials, FCFM, Universidad de Chile, Santiago 8370456, Chile.

Department of Engineering, Physics and Mathematics, Sao Paulo State University (UNESP), Araraquara 14801-385, Brazil.

出版信息

Materials (Basel). 2023 Apr 26;16(9):3390. doi: 10.3390/ma16093390.

DOI:10.3390/ma16093390
PMID:37176271
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10179786/
Abstract

NO is one of the main greenhouse gases, which is mainly generated by the combustion of fossil fuels. In addition to its contribution to global warming, this gas is also directly dangerous to humans. The present work reports the structural and gas sensing properties of the CaCuTiO compound prepared by the sol-gel technique. Rietveld refinement confirmed the formation of the pseudo-cubic CaCuTiO compound, with less than 4 wt% of the secondary phases. The microstructural and elemental composition analysis were carried out using scanning electron microscopy and X-ray energy dispersive spectroscopy, respectively, while the elemental oxidation states of the samples were determined by X-ray photoelectron spectroscopy. The gas sensing response of the samples was performed for different concentrations of NO, H, CO, CH and CH at temperatures between 100 and 300 °C. The materials exhibited selectivity for NO, showing a greater sensor signal at 250 °C, which was correlated with the highest concentration of nitrite and nitrate species on the CCTO surface using DRIFT spectroscopy.

摘要

一氧化氮是主要的温室气体之一，主要由化石燃料燃烧产生。除了对全球变暖有影响外，这种气体对人类也有直接危害。本工作报道了通过溶胶 - 凝胶技术制备的CaCuTiO化合物的结构和气敏特性。Rietveld精修证实了伪立方CaCuTiO化合物的形成，次生相含量低于4 wt%。分别使用扫描电子显微镜和X射线能量色散光谱进行微观结构和元素组成分析，同时通过X射线光电子能谱确定样品的元素氧化态。在100至300°C的温度下，对样品针对不同浓度的NO、H、CO、CH和CH进行气敏响应测试。这些材料对NO具有选择性，在250°C时显示出更大的传感器信号，这与使用漫反射红外傅里叶变换光谱法在CCTO表面检测到的最高浓度的亚硝酸盐和硝酸盐物种相关。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61b6/10179786/5f89832f7fc6/materials-16-03390-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61b6/10179786/5f89832f7fc6/materials-16-03390-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61b6/10179786/f529c481f978/materials-16-03390-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61b6/10179786/bc33d859ac27/materials-16-03390-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61b6/10179786/45aed36f75c0/materials-16-03390-g003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61b6/10179786/4d0917066c05/materials-16-03390-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61b6/10179786/5f89832f7fc6/materials-16-03390-g007.jpg

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