NO2 Sensing Behavior of Compacted Chemically Treated Multi-Walled Carbon Nanotubes

被引：2

作者：

Lapekin, Nikita, I ^{[1
]}

Golovakhin, Valeriy V. ^{[1
]}

Kim, Ekaterina Yu ^{[1
]}

Bannov, Alexander G. ^{[1
]}

机构：

[1] Novosibirsk State Tech Univ, Dept Chem & Chem Engn, Novosibirsk 630073, Russia

来源：

MICROMACHINES | 2022年 / 13卷 / 09期

关键词：

gas sensors; sensor; carbon nanotubes; response; sensitivity; NO2; functionalization; chemical treatment; multi-walled carbon nanotubes; GAS SENSORS; ELECTROCHEMICAL SENSOR; RAMAN-SPECTROSCOPY; ROOM-TEMPERATURE; FUNCTIONALIZATION; NANOCOMPOSITE; NANOMATERIAL; GRAPHITE; GRAPHENE;

D O I：

10.3390/mi13091495

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

This article is devoted to the investigation of the sensing behavior of chemically treated multi-walled carbon nanotubes (MWNTs) at room temperature. Chemical treatment of MWNTs was carried out with a solution of either sulfuric or chromic acids. The materials obtained were investigated by transmission electron microscopy, scanning electron microscopy, Raman-spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The active layer of chemiresistive gas sensors was obtained by cold pressing (compaction) at 11 MPa of powders of bare and treated multi-walled carbon nanotubes. The sensing properties of pellets were investigated using a custom dynamic type of station at room temperature (25 +/- 2 degrees C). Detection of NO2 was performed in synthetic air (79 vol% N-2, 21 vol% O-2). It was found that the chemical treatment significantly affects the sensing properties of multi-walled carbon nanotubes, which is indicated by increasing the response of the sensors toward 100-500 ppm NO2 and lower concentrations.

引用

页数：15

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