Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites

Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites

The development of energy-efficient, sensitive, and reliable gas sensors for monitoring NO<sub>2</sub> concentrations has garnered considerable attention in recent years. In this manuscript, TiO<sub>2</sub> nanotube arrays/reduced graphene oxide nanocomposites with varying rG...

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Bibliographic Details
Main Authors: Yan Ling, Yunjiang Yu, Canxin Tian, Changwei Zou
Format: Article
Language:English
Published: MDPI AG 2024-11-01
Series:Nanomaterials
Subjects:
TiO<sub>2</sub> nanotubes
reduced graphene oxide
NO<sub>2</sub> gas sensing
nanocomposites
room temperature sensors
Online Access:https://www.mdpi.com/2079-4991/14/22/1844
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Summary:The development of energy-efficient, sensitive, and reliable gas sensors for monitoring NO<sub>2</sub> concentrations has garnered considerable attention in recent years. In this manuscript, TiO<sub>2</sub> nanotube arrays/reduced graphene oxide nanocomposites with varying rGO contents (TiO<sub>2</sub> NTs/rGO) were synthesized via a two-step method for room temperature NO<sub>2</sub> gas detection. From SEM and TEM images, it is evident that the rGO sheets not only partially surround the TiO<sub>2</sub> nanotubes but also establish interconnection bridges between adjacent nanotubes, which is anticipated to enhance electron–hole separation by facilitating electron transfer. The optimized TiO<sub>2</sub> NTs/rGO sensor demonstrated a sensitive response of 19.1 to 1 ppm of NO<sub>2</sub>, a 5.26-fold improvement over the undoped TiO<sub>2</sub> sensor. Additionally, rGO doping significantly enhanced the sensor’s response/recovery times, reducing them from 24 s/42 s to 18 s/33 s with just 1 wt.% rGO. These enhancements are attributed to the increased specific surface area, higher concentration of chemisorbed oxygen species, and the formation of p-n heterojunctions between TiO<sub>2</sub> and rGO within the nanocomposites. This study provides valuable insights for the development of TiO<sub>2</sub>/graphene-based gas sensors for detecting oxidizing gases at room temperature.
ISSN:2079-4991

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