润湿
湿度
材料科学
纳米管
纳米技术
相对湿度
单层
超短脉冲
光电子学
复合材料
碳纳米管
光学
激光器
热力学
物理
作者
Zhenkun He,Keke Li,Ronghui Kou,Wenwen Zhang,Jiulong Zhao,Zhida Gao,Yan‐Yan Song
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2024-02-09
卷期号:9 (2): 1014-1022
被引量:1
标识
DOI:10.1021/acssensors.3c02684
摘要
In all their applications, gas sensors should satisfy several requirements, including low cost, reduced energy consumption, fast response/recovery, high sensitivity, and reliability in a broad humidity range. Unfortunately, the fast response/recovery and sensing reliability under high humidity conditions are often still missing, especially those working at room temperature. In this study, a humidity-resistant gas sensor with an ultrafast response/recovery rate was designed by integrating a defect-rich semiconducting sensing interface and a self-assembled monolayer (SAM) with controllable wettability. As a proof-of-concept application, ammonia (NH3), one of the atmospheric and indoor pollutants, was selected as the target gas. The decoration of interconnected defective CeO2 nanowires on spaced TiO2 nanotube arrays (NTAs) provided superior NH3 sensing performances. Moreover, we showed that manipulating the functional end group of SAMs is an efficient and simple method to adjust the wettability, by which 86% sensitivity retention with an ultrafast response (within 5 s) and a low limit of detection (45 ppb) were achieved even at 75% relative humidity and room temperature. This work provides a new route toward the comprehensive design and application of metal oxide semiconductors for trace gas monitoring under harsh conditions, such as those of agricultural, environmental, and industrial fields.
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