Department of Personal Protective Equipment, Central Institute for Labour Protection-National Research Institute, 90-133 Lodz, Poland.
Faculty of Materials, Civil and Environmental Engineering, University of Bielsko-Biala, 43-309 Bielsko-Biala, Poland.
Sensors (Basel). 2021 Apr 22;21(9):2948. doi: 10.3390/s21092948.
The paper presents various dispersive systems developed for sensing toxic substance-ammonia. Polycarbonate dissolved in methylene chloride was used as a polymer matrix, which was enriched with: multi-walled carbon nanotubes (MWCNs), reduced graphene oxide (rGO) and conductive polymer (polyaniline-PANi). Dispersive systems were applied to the prefabricated substrates with comb electrodes by two methods: spraying and drop-casting, forming an active chemosensitive to ammonia vapours films. The spraying method involved applying the dispersion to the substrate by an aerograph for a specific time, whereas drop-casting involves depositing of the produced dispersive systems using a precision automatic pipette. The electrical responses of the obtained films were examined for nominal concentrations of ammonia vapours. Different types of dispersions with various composition were tested, the relationships between individual compounds and ammonia were analysed and the most promising dispersions were selected. Sensor containing rGO deposited by drop-casting revealed the highest change in the resistance (14.21%).
本文提出了各种用于感测有毒物质-氨的分散体系。聚碳酸酯溶解在二氯甲烷中用作聚合物基质，其中富集了：多壁碳纳米管（MWCNTs）、还原氧化石墨烯（rGO）和导电聚合物（聚苯胺-PANi）。分散体系通过两种方法应用于带有梳状电极的预制基底：喷涂和滴铸，形成对氨蒸气敏感的活性化学薄膜。喷涂方法涉及通过喷枪在特定时间内将分散体施加到基底上，而滴铸则涉及使用精密自动移液器沉积所产生的分散体系。对氨蒸气的名义浓度测试了所获得的薄膜的电响应。测试了具有不同组成的不同类型的分散体，分析了各个化合物与氨之间的关系，并选择了最有前途的分散体。通过滴铸沉积 rGO 的传感器显示出最高的电阻变化（14.21%）。
