Breath Figure Micromolding Approach for Regulating the Microstructures of Polymeric Films for Triboelectric Nanogenerators
Breath Figure Micromolding Approach for Regulating the Microstructures of Polymeric Films for Triboelectric Nanogenerators
复制标题
DOI：
10.1021/acsami.6b14729
复制
发表时间：
2017-02-08
影响因子：
9.5
通讯作者：
Tao, Xiaoming
中科院分区：
文献类型：
--
作者：
Gong, Jianliang;Xu, Bingang;Tao, Xiaoming
摩擦电纳米发电机（TENG）是一种创新的能量采集器，最近开发的有机材料的基础上，通过结合使用摩擦电效应和静电感应将机械能转化为电能。聚合物材料及其微观结构在摩擦电荷的产生、积累和保持中起着关键作用，这决定性地决定了TENG的最终电性能。在此，我们报告了一个简单而有效的呼吸图（BF）微成型方法，以快速调节表面微结构的聚合物薄膜的TENG组装。通过简单调节聚合物溶液的浓度，首次采用BF技术制备了具有可调孔径和空间结构的蜂窝状多孔膜。然后，他们被用来作为负模具直接合成的聚二甲基硅氧烷（PDMS）薄膜与不同的微透镜阵列（MLAs）和透镜尺寸，这是进一步组装TENG研究薄膜的微观结构的影响。所有MLA为基础的TENG被发现有一个明显增强的电性能相比，一个平面的PDMS膜为基础的TENG。具体而言，在相同的触发条件下，基于MLA的TENG与基于平坦PDMS膜的TENG相比，具有最佳表面微结构，可以实现高达3倍的电性能改善。基于MLA的TENG进一步成功地用于收集由不同人体运动产生的废机械能，包括手指敲击、拍手和频率范围为0.5至5.5 Hz的步行。
A triboelectric nanogenerator (TENG) is an innovative kind of energy harvester recently developed on the basis of organic materials for converting mechanical energy into electricity through the combined use of the triboelectric effect and electrostatic induction. Polymeric materials and their microstructures play key roles in the generation, accumulation, and retainment of triboelectric charges, which decisively determines the final electric performance of TENGs. Herein we report a simple and efficient breath figure (BF) micromolding approach to rapidly regulate the surface microstructures of polymeric films for the assembly of TENGs. Honeycomb porous films with adjustable pore size and dimensional architectures were first prepared by the BF technique through simply adjusting the concentration of the polymer solution. They were then used as negative molds for straightforward synthesis of polydirnethylsiloxane (PDMS) films with different microlens arrays (MLAs) and lens sizes, which were further assembled for TENGs to investigate the influence of film microstructures. All MLA-based TENGs were found to have an obviously enhanced electric performance in comparison with a flat-PDMS-film-based TENG. Specifically, up to 3 times improvement in the electric performance can be achieved by the MLA-based TENG with optimal surface microstructures over flat-PDMS-film-based TENG under the same triggering conditions. A MLA-based TENG was further successfully used to harvest the waste mechanical energy generated by different human body motions, including finger tapping, hand clapping, and walking with a frequency ranging from 0.5 to 5.5 Hz.