Daripa Soumili, Khawas Koomkoom, Behere Ravi Prakash, Verma Rampal, Kuila Biplab Kumar
Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India.
ACS Omega. 2021 Mar 10;6(11):7257-7265. doi: 10.1021/acsomega.0c03717. eCollection 2021 Mar 23.
This Research Article demonstrates a very simple approach of a moisture-induced power-generating phenomenon using water-soluble rod-coil conjugated block copolymer (poly(3-hexythiophene)--poly(4-styrenesulfonic acid) (P3HT--PSSA)-modified reduced graphene oxide. The block copolymer-modified reduced graphene oxide (BCP-RGO) was prepared by noncovalent surface functionalization cum in situ reduction of graphene oxide. A simple device made from BCP-RGO can generate voltage upon exposure to water vapor or under different humidity conditions. The open-circuit voltage generated from the diode-like device varies with respect to the relative humidity, and the device can act as a self-powered humidity sensor. The as-prepared BCP-RGO is able to produce a maximum power density of 1.15 μW/cm (short-circuit current density = 6.40 μA/cm) at a relative humidity of 94%. Meanwhile, the BCP-RGO device produces a very high power density of 0.7 mW/cm (at a short-circuit current density of 1.06 mA/cm) after 91% water absorption. We believe that the material presented here will be very useful for a self-biased humidity sensor and moisture-induced energy harvesting. The diode-like response of the BCP-RGO device with humidity or after water absorption will make the material applicable for self-biased humidity-controlled electronic switching.
这篇研究文章展示了一种利用水溶性棒-线圈共轭嵌段共聚物（聚（3-己基噻吩）-聚（4-苯乙烯磺酸）（P3HT-PSSA））修饰的还原氧化石墨烯实现湿气诱导发电现象的非常简单的方法。通过氧化石墨烯的非共价表面功能化及原位还原制备了嵌段共聚物修饰的还原氧化石墨烯（BCP-RGO）。由BCP-RGO制成的简单器件在暴露于水蒸气或不同湿度条件下时能够产生电压。类似二极管的器件产生的开路电压随相对湿度而变化，并且该器件可以用作自供电湿度传感器。所制备的BCP-RGO在相对湿度为94%时能够产生1.15 μW/cm²的最大功率密度（短路电流密度 = 6.40 μA/cm²）。同时，BCP-RGO器件在吸水91%后产生非常高的功率密度0.7 mW/cm²（短路电流密度为1.06 mA/cm²）。我们相信这里展示的材料对于自偏置湿度传感器和湿气诱导的能量收集将非常有用。BCP-RGO器件在湿度变化或吸水后的类似二极管的响应将使该材料适用于自偏置湿度控制的电子开关。
