Institute of Microelectronics, Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, People's Republic of China. Agricultural Information Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Agricultural Information Service Technology of Ministry of Agriculture, Beijing 100081, People's Republic of China.
Nanotechnology. 2017 Aug 11;28(32):325501. doi: 10.1088/1361-6528/aa79e6. Epub 2017 Jun 15.
Gas sensors based on reduced graphene oxide (rGO) films and rGO/MoS hybrid films were fabricated on polyethylene naphthalate substrates by a simple self-assembly method, which yielded flexible devices for detection of formaldehyde (HCHO) at room temperature. The sensing test results indicated that the rGO and rGO/MoS sensors were highly sensitive and fully recoverable to a ppm-level of HCHO. The bending and fatigue test results revealed that the sensors were also mechanically robust, durable and effective for long-term use. The rGO/MoS sensors showed higher sensitivities than rGO sensors, which was attributed to the enhanced HCHO adsorption and electron transfer mediated by MoS. Furthermore, two kinds of MoS nanosheets were prepared by either hydrothermal synthesis or chemical exfoliation and were compared for their detection of HCHO, which revealed that the hydrothermally produced MoS nanosheets with rich defects led to enhanced sensitivity of the rGO/MoS sensors. Moreover, these fabricated flexible sensors can be applied for the HCHO detection in food packaging.
基于还原氧化石墨烯（rGO）薄膜和 rGO/MoS 杂化薄膜的气体传感器通过简单的自组装方法在聚萘二甲酸乙二醇酯基底上制备，得到了用于室温下检测甲醛（HCHO）的柔性器件。传感测试结果表明，rGO 和 rGO/MoS 传感器对 ppm 级别的 HCHO 具有高灵敏度和完全可恢复性。弯曲和疲劳测试结果表明，这些传感器还具有机械坚固性、耐用性和长期使用的有效性。rGO/MoS 传感器比 rGO 传感器具有更高的灵敏度，这归因于 MoS 增强的 HCHO 吸附和电子转移。此外，通过水热合成或化学剥离制备了两种 MoS 纳米片，并对其进行了 HCHO 检测比较，结果表明富含缺陷的水热法制备的 MoS 纳米片导致 rGO/MoS 传感器的灵敏度增强。此外，这些制备的柔性传感器可应用于食品包装中的 HCHO 检测。
