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通过-TiO@SnO纳米复合材料实现亚ppm级甲醛检测。

Sub-ppm Formaldehyde Detection by - TiO@SnO Nanocomposites.

作者信息

Nasriddinov Abulkosim, Rumyantseva Marina, Marikutsa Artem, Gaskov Alexander, Lee Jae-Hyoung, Kim Jae-Hun, Kim Jin-Young, Kim Sang Sub, Kim Hyoun Woo

机构信息

Chemistry Department, Moscow State University, Moscow 119991 Russia.

Faculty of Materials Science, Moscow State University, Moscow 119991 Russia.

出版信息

Sensors (Basel). 2019 Jul 19;19(14):3182. doi: 10.3390/s19143182.

DOI:10.3390/s19143182
PMID:31331010
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6679342/
Abstract

Formaldehyde (HCHO) is an important indicator of indoor air quality and one of the markers for detecting lung cancer. Both medical and air quality applications require the detection of formaldehyde in the sub-ppm range. Nanocomposites SnO/TiO are promising candidates for HCHO detection, both in dark conditions and under UV illumination. Nanocomposites TiO@SnO were synthesized by ALD method using nanocrystalline SnO powder as a substrate for TiO layer growth. The microstructure and composition of the samples were characterized by ICP-MS, TEM, XRD and Raman spectroscopy methods. The active surface sites were investigated using FTIR and TPR-H methods. The mechanism of formaldehyde oxidation on the surface of semiconductor oxides was studied by in situ DRIFTS method. The sensor properties of nanocrystalline SnO and TiO@SnO nanocomposites toward formaldehyde (0.06-0.6 ppm) were studied by in situ electrical conductivity measurements in dark conditions and under periodic UV illumination at 50-300 °C. Nanocomposites TiO@SnO exhibit a higher sensor signal than SnO and a decrease in the optimal measurement temperature by 50 °C. This result is explained based on the model considering the formation of - heterocontact at the SnO/TiO interface. UV illumination leads to a decrease in sensor response compared with that obtained in dark conditions because of the photodesorption of oxygen involved in the oxidation of formaldehyde.

摘要

甲醛（HCHO）是室内空气质量的重要指标，也是检测肺癌的标志物之一。医学和空气质量应用都需要检测亚ppm范围内的甲醛。纳米复合材料SnO/TiO无论是在黑暗条件下还是在紫外光照下，都是用于甲醛检测的有前景的候选材料。以纳米晶SnO粉末为TiO层生长的基底，通过原子层沉积（ALD）法合成了纳米复合材料TiO@SnO。采用电感耦合等离子体质谱（ICP-MS）、透射电子显微镜（TEM）、X射线衍射（XRD）和拉曼光谱法对样品的微观结构和组成进行了表征。利用傅里叶变换红外光谱（FTIR）和程序升温还原-氢气（TPR-H）法研究了活性表面位点。通过原位漫反射红外傅里叶变换光谱（DRIFTS）法研究了半导体氧化物表面甲醛氧化的机理。通过在黑暗条件下以及在50-300℃的周期性紫外光照下进行原位电导率测量，研究了纳米晶SnO和TiO@SnO纳米复合材料对甲醛（0.06-0.6 ppm）的传感器性能。纳米复合材料TiO@SnO表现出比SnO更高的传感器信号，并且最佳测量温度降低了50℃。基于考虑在SnO/TiO界面形成异质结的模型对该结果进行了解释。与黑暗条件下获得的结果相比，紫外光照导致传感器响应降低，这是由于参与甲醛氧化的氧的光解吸所致。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9b13/6679342/2f5b7c0e0c06/sensors-19-03182-g014.jpg
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