The Functionalized Single-Walled Carbon Nanotubes Gas Sensor With Pd Nanoparticles for Hydrogen Detection in the High-Voltage Transformers.

Sirui Tang,Yanqiong Li,Yu Wang,Weigen Chen,Zihao Song,He Zhang

doi:10.3389/fchem.2020.00174

Abstract

Single-walled carbon nanotubes (SWCNTs) have been widely discussed and applied as novel gas sensing nanomaterials. Hydrogen is one of the remarkable fault characteristic gases in high-voltage oil-paper insulated transformers. In this paper, 3.07 wt% Pd nanoparticles (NPs) were used to decorate SWCNTs. The unloaded, the carboxylated, and the Pd-doped SWCNTs were fabricated into three planar gas sensors, and their gas sensing properties to hydrogen were studied. Gas sensing mechanism was analyzed. Results show that the optimal operating temperature of a Pd-doped SWCNTs-based gas sensor is 125°C lower than that of the unloaded SWCNTs-based gas sensor, and it shows the highest gas sensing response value. This is attributed to the decreasing work function of Pd, which reduces the hole carries in the nanotubes.

Highlights

Novel gas sensing materials were discovered and have been studied over the past five decades
Single-walled carbon nanotubes (SWCNTs) were oxidized under the action of concentrated sulfuric acid and concentrated nitric acid
Because carbon atoms are not stable six-membered rings in SWCNTs and are in a metastable state, SWCNTs will break in places where the nanotube curvature is large

Summary

INTRODUCTION

Novel gas sensing materials were discovered and have been studied over the past five decades. Fault in the oil-immersed transformer (International Standard IEC 60599: 2015, 2015) Gas sensing nanomaterials such as SnO2, ZnO, WO3, and MoS2, as well as their functionalized derivatives, have been applied in studies on characteristic gases detecting of high-voltage transformers (Tang et al, 2017; Zhou et al, 2018; Wang et al, 2019; Wei et al, 2019). Zhang et al found that CNTs are well-performed gas sensing materials for gas detection of high-voltage electrical equipment (Zhang et al, 2017) It was reported in the study Kong et al (2001) that nanotubes show a poor sensing response to some gas molecules. This study can provide a novel solution to the issue of characteristic gases detection in high-voltage oil-paper insulated transformers

MATERIALS AND METHODS

RESULTS AND DISCUSSIONS

CONCLUSION

DATA AVAILABILITY STATEMENT