Department of Electrical Engineering, Chungnam National University , Daejeon 34134, Korea.
Department of Chemistry, Korea University , Seoul 02841, Korea.
ACS Nano. 2017 Jun 27;11(6):6131-6138. doi: 10.1021/acsnano.7b02156. Epub 2017 Jun 7.
Triboelectric charging involves frictional contact of two different materials, and their contact electrification usually relies on polarity difference in the triboelectric series. This limits the choices of materials for triboelectric contact pairs, hindering research and development of energy harvest devices utilizing triboelectric effect. A progressive approach to resolve this issue involves modification of chemical structures of materials for effectively engineering their triboelectric properties. Here, we describe a facile method to change triboelectric property of a polymeric surface via atomic-level chemical functionalizations using a series of halogens and amines, which allows a wide spectrum of triboelectric series over single material. Using this method, tunable triboelectric output power density is demonstrated in triboelectric generators. Furthermore, molecular-scale calculation using density functional theory unveils that electrons transferred through electrification are occupying the PET group rather than the surface functional group. The work introduced here would open the ability to tune triboelectric property of materials by chemical modification of surface and facilitate the development of energy harvesting devices and sensors exploiting triboelectric effect.
摩擦起电涉及两种不同材料的摩擦接触，其接触带电通常依赖于摩擦序列中的极性差异。这限制了摩擦接触对材料的选择，阻碍了利用摩擦起电效应的能量收集装置的研究和开发。解决这个问题的一种渐进方法是通过原子级化学官能化来修饰材料的化学结构，从而有效地工程化其摩擦电性能。在这里，我们描述了一种通过一系列卤素和胺，使用原子级化学官能化来改变聚合物表面摩擦电性能的简单方法，该方法允许在单一材料上实现广泛的摩擦电系列。使用这种方法，在摩擦发电机中展示了可调谐的摩擦发电输出功率密度。此外，使用密度泛函理论的分子尺度计算揭示了通过带电转移的电子占据的是 PET 基团而不是表面官能团。这里介绍的工作将通过表面化学修饰来调节材料的摩擦电性能的能力，并促进利用摩擦起电效应的能量收集装置和传感器的发展。
