Kang Kyungnam, Park Jaeho, Kim Byeongsu, Na Kwangmin, Cho Incheol, Rho Junsuk, Yang Daejong, Lee Jung-Yong, Park Inkyu
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
ACS Appl Mater Interfaces. 2020 Sep 2;12(35):39024-39032. doi: 10.1021/acsami.0c08128. Epub 2020 Aug 20.
We report a new type of self-powered gas sensors based on the combination of a colorimetric film with hierarchical micro/nanostructures and organic photovoltaic cells. The transmittance of the colorimetric film with micro/nanostructures coated with ,,','-tetramethyl--phenylenediamine (TMPD) changes by reacting with NO gas, and it is measured as a current output of the photovoltaic cell. For this purpose, materials for the organic photovoltaic cells were carefully chosen to match the working wavelength of the TMPD. Micropost arrays and nanowires increase the surface area for the gas reaction and thus improve the transmittance changes by NO gas (6.7% change for the plain film vs 27.7% change for the film with hierarchical micro/nanostructures to 20 ppm of NO). Accordingly, the colorimetric device with the hierarchical structures showed a response of Δ/ = 0.27-20 ppm of NO, which is a 71% improvement compared to that of the plain sensing film. Furthermore, it showed a high selectivity against other gases such as HS and CO with almost negligible responses. Since the current output change of the photovoltaic cell is utilized as a sensor signal, no extra electrical power is required for the operation of gas sensors. We also integrated the sensor device with an electrical module and demonstrated a self-powered gas alarm system.
我们报道了一种基于比色膜与分级微/纳米结构以及有机光伏电池相结合的新型自供电气体传感器。涂有 ,,','-四甲基-对苯二胺（TMPD）的具有微/纳米结构的比色膜的透过率通过与NO气体反应而发生变化，并作为光伏电池的电流输出进行测量。为此，精心选择有机光伏电池的材料以匹配TMPD的工作波长。微柱阵列和纳米线增加了气体反应的表面积，从而改善了NO气体引起的透过率变化（对于普通薄膜，变化为6.7%，而对于具有分级微/纳米结构的薄膜，在20 ppm的NO浓度下变化为27.7%）。因此，具有分级结构的比色装置对20 ppm的NO显示出Δ/ = 0.27的响应，与普通传感薄膜相比提高了71%。此外，它对其他气体如HS和CO具有高选择性，响应几乎可以忽略不计。由于光伏电池的电流输出变化被用作传感器信号，气体传感器的运行不需要额外的电力。我们还将传感器装置与电气模块集成，并展示了一种自供电气体报警系统。
