Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
Department of Mechanical Engineering, National Taipei University of Technology, Taipei 106, Taiwan.
Sensors (Basel). 2021 Sep 12;21(18):6121. doi: 10.3390/s21186121.
Toxic and nontoxic volatile organic compound (VOC) gases are emitted into the atmosphere from certain solids and liquids as a consequence of wastage and some common daily activities. Inhalation of toxic VOCs has an adverse effect on human health, so it is necessary to monitor their concentration in the atmosphere. In this work, we report on the fabrication of inorganic nanotube (INT)-tungsten disulfide, paper-based graphene-PEDOT:PSS sheet and WS nanotube-modified conductive paper-based chemiresistors for VOC gas sensing. The WS nanotubes were fabricated by a two-step reaction, that is oxide reduction and sulfurization, carried out at 900 °C. The synthesized nanotubes were characterized by FE-SEM, EDS, XRD, Raman spectroscopy, and TEM. The synthesized nanotubes were 206-267 nm in diameter. The FE-SEM results show the length of the nanotubes to be 4.5-8 µm. The graphene-PEDOT:PSS hybrid conductive paper sheet was fabricated by a continuous coating process. Then, WS nanotubes were drop-cast onto conductive paper for fabrication of the chemiresistors. The feasibility and sensitivity of the WS nanotube-modified paper-based chemiresistor were tested in four VOC gases at different concentrations at room temperature (RT). Experimental results show the proposed sensor to be more sensitive to butanol gas when the concentration ranges from 50 to 1000 ppm. The limit of detection (LOD) of this chemiresistor for butanol gas was 44.92 ppm. The WS nanotube-modified paper-based chemiresistor exhibits good potential as a VOC sensor with the advantages of flexibility, easy fabrication, and low fabrication cost.
有毒和无毒挥发性有机化合物 (VOC) 气体是某些固体和液体在浪费和一些常见日常活动的情况下排放到大气中的。吸入有毒 VOC 会对人体健康产生不利影响，因此有必要监测其在大气中的浓度。在这项工作中，我们报告了无机纳米管 (INT)-二硫化钨、基于纸张的石墨烯-PEDOT:PSS 片和 WS 纳米管修饰的导电纸基化学电阻器的制备，用于 VOC 气体传感。WS 纳米管通过两步反应在 900°C 下进行氧化还原和硫化来制备。通过 FE-SEM、EDS、XRD、拉曼光谱和 TEM 对合成的纳米管进行了表征。合成的纳米管直径为 206-267nm。FE-SEM 结果表明纳米管的长度为 4.5-8μm。石墨烯-PEDOT:PSS 混合导电纸片通过连续涂层工艺制备。然后，将 WS 纳米管滴铸到导电纸上，用于制备化学电阻器。在室温下（RT），用四种不同浓度的 VOC 气体测试了 WS 纳米管修饰的纸基化学电阻器的可行性和灵敏度。实验结果表明，该传感器对浓度范围在 50-1000ppm 之间的丁醇气体更敏感。该化学电阻器对丁醇气体的检测限 (LOD) 为 44.92ppm。WS 纳米管修饰的纸基化学电阻器具有柔韧性好、易于制造和制造成本低等优点，作为 VOC 传感器具有很大的潜力。
