长石
二甲基二硫化物
气味
电子鼻
检出限
相对湿度
化学
氧化物
材料科学
纳米技术
硫黄
有机化学
物理
色谱法
热力学
作者
Ruofan Zhang,Zanhong Deng,Meng Li,Kun Cao,Junqing Chang,Dandan Rong,Shimao Wang,Shengyun Huang,Gang Meng
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2024-03-08
卷期号:9 (3): 1410-1418
标识
DOI:10.1021/acssensors.3c02481
摘要
Dimethyl disulfide (DMDS) is a common odor pollutant with an extremely low olfactory threshold. Highly sensitive and selective detection of DMDS in ambient humid air background, by metal oxide semiconductor (MOS) sensors, is highly desirable to address the increased public concern for health risk. However, it has still been a critical challenge up to now. Herein, p-type delafossite CuGaO2 has been proposed as a promising DMDS sensing material owing to its striking hydrophobicity (revealed by water contact angle measurement) and excellent partial catalytic oxidation properties (indicated by mass spectroscopy). The present CuGaO2 sensor shows a selective DMDS response, with satisfied humidity resistance performance and long-term stability at a relatively low operation temperature of 140 °C. An ultrahigh response of 100 to 10 ppm DMDS and a low limit of detection of 3.3 ppb could be achieved via a pulsed temperature modulation strategy. A smart sensing system based on a CuGaO2 sensor has been developed, which could precisely monitor DMDS vapor in ambient humid air, even with the presence of multiple interfering gases, demonstrating the practical application capability of MOS sensors for environmental odor monitoring.
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