School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, P. R. China.
Adv Mater. 2019 Sep;31(39):e1902793. doi: 10.1002/adma.201902793. Epub 2019 Aug 15.
A liquid-solid contact triboelectric nanogenerator (TENG) based on poly(tetrafluoroethylene) (PTFE) film, a copper electrode, and a glass substrate for harvesting energy in oil/water multiphases is reported. There are two distinctive signals being generated, one is from the contact electrification and electrostatic induction between the liquid (water/oil) and the PTFE film (V and I ); and the other is from the electrostatic induction in the copper electrode by the oil/water interfacial charges (ΔV and I ), which is generated only when the liquid-solid contact TENG is inserted across the oil/water interface. The two signals show interesting opposite changing trends that the V and I decrease while the oil/water interfacial signals of ΔV and I increase after coating a layer of polydopamine on the surfaces of PTFE and glass via self-polymerization. As an application of the observed phenomena, both the values of I and I have a good linear relationship versus the natural logarithm of the concentration of the dopamine. Based on this, the first self-powered dual-signal detection of dopamine using TENG is demonstrated.
一种基于聚四氟乙烯（PTFE）薄膜、铜电极和玻璃基底的液-固接触摩擦纳米发电机（TENG）被报道用于在油水多相环境中收集能量。该 TENG 会产生两种独特的信号，一种是液体（水/油）与 PTFE 薄膜之间的接触带电和静电感应（V 和 I）产生的信号；另一种是由油水界面电荷在铜电极中产生的静电感应（ΔV 和 I）产生的信号，只有当液体-固体接触 TENG 插入油水界面时才会产生。这两种信号表现出有趣的相反变化趋势，即在 PTFE 和玻璃表面通过自聚合涂覆一层聚多巴胺后，V 和 I 减小，而油/水界面信号ΔV 和 I 增大。作为观察到的现象的应用，I 和 I 的值与多巴胺浓度的自然对数呈良好的线性关系。基于此，首次使用 TENG 实现了对多巴胺的自供电双信号检测。
