基于甘油交联PEDOT:PSS-MoS2纳米复合材料的室温超灵敏二氧化氮气体传感器

IF 4.7 2区 化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Priyanka Dutta, Anuj Sharma, Videsh Kumar and Govind Gupta*, 
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引用次数: 0

摘要

二氧化氮(NO2)是一种毒性极大的环境污染物,对人类具有致命性,对环境极为危险。二氧化氮是一种高度挥发的气体,会发生光化学反应,导致酸雨或产生臭氧。暴露于极低浓度的二氧化氮会严重影响人体健康,主要是损害肺组织。因此,制造响应/恢复时间极短的高灵敏度和便携式室温NO2气体检测传感器对于环境监测和人类安全至关重要。为了解决上述挑战,我们利用二维MoS2纳米片,基于甘油交联PEDOT:PSS/MoS2纳米复合材料,制造了一种非常敏感和高选择性的NO2气体传感器。通过增加衬底的粗糙度和导电聚合物薄膜的附着力,促进了气体传感器在衬底上的沉积。粗糙度的增加有利于更好的气体吸附,这反过来又增加了传感器的气体传感能力。采用不同浓度的二硫化钼纳米片制备了三种不同的纳米复合材料,并优化了对二氧化氮气体响应最大的传感器。该传感器材料在NO2气体存在下表现出n型半导体行为,在100ppb NO2气体存在下响应迅速,恢复时间分别为10.2 s和5.5 s。所制备的气体传感器即使在室温下也能对极低浓度的NO2气体做出优异的响应。该传感器对50 ppm NO2的响应为500.3%,对100 ppb NO2气体的响应为22.1%,检测限为40.02 ppb。高选择性传感器对其他氧化性/还原性气体的响应为零或非常低。此外,室温气体传感是一个额外的优势,因为它减少了设备的功耗。聚合物纳米膜的大表面积有助于增强n型富电子半导体与接受电子的氧化气体之间的电荷转移现象,从而获得优异的气敏性能。该研究提出了潜在的半导体纳米结构传感器材料,具有实时检测二氧化氮的前景,以保护人类和环境安全。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ultrasensitive NO2 Gas Sensor at Room Temperature Based on a Glycerol-Cross-Linked PEDOT:PSS-MoS2 Nanocomposite

Ultrasensitive NO2 Gas Sensor at Room Temperature Based on a Glycerol-Cross-Linked PEDOT:PSS-MoS2 Nanocomposite

Nitrogen dioxide (NO2) is a tremendously toxic environmental pollutant that can be lethal to humans and extremely dangerous to the environment. NO2, being a highly volatile gas, undergoes photochemical reactions that can cause acid rain or generate ozone. Exposure to extremely low concentrations of NO2 can severely impact human health, primarily damaging lung tissues. Thus, fabricating highly sensitive and portable sensors for room-temperature detection of NO2 gas with a very low response/recovery time is extremely important for environmental monitoring and human safety. To address the above challenges, we have fabricated an extremely sensitive and highly selective NO2 gas sensor based on a glycerol-cross-linked PEDOT:PSS/MoS2 nanocomposite using two-dimensional MoS2 nanosheets. The deposition of the gas sensor over the substrate was facilitated by increasing the roughness of the substrate and the adhesion of the conducting polymeric films. Increased roughness facilitated better gas adsorption, which in turn increased the gas sensing capacity of the sensor. Three different nanocomposites were prepared using different concentrations of MoS2 nanosheets, and the sensor with the greatest responsivity to NO2 gas was optimized. The sensor material showed an N-type semiconducting behavior in the presence of NO2 gas with swift response and recovery times of 10.2 and 5.5 s in the presence of 100 ppb NO2 gas. The fabricated gas sensor gave a superior response to extremely low concentrations of NO2 gas even at room temperature. The sensor showed a response of 500.3% to 50 ppm of NO2 and 22.1% to 100 ppb of NO2 gas, and the detection limit was 40.02 ppb. The highly selective sensor shows a zero or very low response toward other oxidizing/reducing gases. Moreover, room-temperature gas sensing is an additional advantage because it reduces the power consumption of the device. The large surface area of the polymeric nanofilms is proposed to help enhance the charge transfer phenomenon between the N-type electron-rich semiconductor and the electron-accepting oxidizing gas, resulting in their excellent gas-sensing performance. This study proposes potential semiconducting nanostructured sensor materials with prospects for real-time NO2 detection for human protection and environmental safety.

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来源期刊
CiteScore
7.20
自引率
6.00%
发文量
810
期刊介绍: ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.
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