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Pt decorated MoS2 nanoflakes for ultrasensitive resistive humidity sensor

机译：PT装饰MOS2纳米薄膜用于超细电阻湿度传感器

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摘要

In this work, we report the fabrication of a low power, humidity sensor where platinum nanoparticles (NPs) decorated few-layered molybdenum disulphide (MoS2) nanoflakes have been used as the sensing layer. A mixed solvent was used to exfoliate the nanoflakes from the bulk powder. Then the Pt/MoS2 composites were prepared by reducing Pt NPs from chloroplatinic acid hexahydrate using a novel reduction technique using sulphide salt. The successful reduction and composite preparation were confirmed using various material characterization tools like scanning electron microscopy, atomic force microscopy, transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, Raman spectroscopy and UV-visible spectroscopy. The humidity sensors were prepared by drop-coating the Pt-decorated MoS2 on gold interdigitated electrodes and then exposed to various levels of relative humidity (RH). Composites with different weight ratios of Pt were tested and the best response was shown by the Pt/MoS2 (0.25: 1) sample with a record high response of similar to 4000 times at 85% RH. The response and recovery times were similar to 92 s and similar to 154 s respectively with repeatable behaviour. The sensor performance was found to be stable when tested over a few months. The underlying sensing mechanisms along with detailed characterization of the various composites have been discussed.
机译：在这项工作中，我们报告了低功率，湿度传感器的制造，其中铂纳米颗粒（NPS）装饰着少量层状钼二硫化物（MOS2）纳米薄片已被用作传感层。使用混合溶剂从散装粉末去除纳米薄片。然后使用硫代盐的新增还原技术将Pt / MOS2复合材料从氯铂己酸氯化酸六水合物中还原Pt NPS制备。使用各种材料表征工具，如扫描电子显微镜，原子力显微镜，透射电子显微镜，X射线衍射，X射线光电子能谱，拉曼光谱和UV可见光光谱，确认成功减少和复合制剂。通过将PT装饰的MOS2涂布在金叉指的电极上，然后暴露于各种相对湿度（RH）来制备湿度传感器。测试具有不同重量比的Pt的复合材料，Pt / MOS2（0.25：1）样品显示了最佳响应，其具有高响应的高响应，在85％RH下类似于4000次。响应和恢复时间与92秒和类似于154秒，分别具有可重复行为。在几个月内测试时，发现传感器性能稳定。已经讨论了底层传感机制以及各种复合材料的详细表征。

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