Abstract：
Here we report the liquid-solid interaction in droplet-based triboelectric nanogenerators (TENG) for estimation of human Na+/K+levels. The exploitation of PVDF-HFP encapsulated WS2as active layer in the droplet-based TENG (DTENG) leads to the generation of electrical signal during the impact of water droplet. Comparison over the control devices indicates that surface quality and dielectric nature of the PVDF-HFP/WS2composite largely dictates the performance of the DTENG. The demonstration of excellent sensitivity of the DTENG towards water quality indicates its promising application towards water testing. In addition, the alteration in output signal with slightest variation in ionic concentration (Na+or K+) in water has been witnessed and is interpreted with charge transfer and ion transfer processes during liquid-solid interaction. The study reveals that the ion mobility largely affects the ion adsorption process on the active layer of PVDF-HFP/WS2and thus generates distinct output profiles for diverse ions like Na+and K+. Following that, the DTENG characteristics have been exploited to artificial urine where the varying output signals have been recorded for variation in urinary Na+ion concentration. Therefore, the deployment of PVDF-HFP/WS2in DTENG holds promising application towards the analyse of ionic characteristics of body fluids.
摘要：
在这里，我们报告了基于液滴的摩擦电纳米发电机（TENG）中的液固相互作用，用于估计人类Na/K水平。利用PVDF-HFP封装的WS2作为DTENG中的活性层导致在水滴撞击期间产生电信号。与对照器件的比较表明,PVDF-HFP/WS2复合材料的表面质量和介电性质在很大程度上决定了DTENG的性能。DTENG对水质具有出色的敏感性，表明其在水质测试中的应用前景广阔。此外,已经见证了输出信号的变化，水中离子浓度（Na或K）的变化最小，并通过液-固相互作用期间的电荷转移和离子转移过程来解释。研究表明，离子迁移率在很大程度上影响PVDF-HFP/WS2活性层上的离子吸附过程，从而为Na和K等多种离子产生不同的输出曲线。在此之后,DTENG特性已被用于人工尿液，其中已记录了不同的输出信号以了解尿液中Na离子浓度的变化。因此,在DTENG中部署PVDF-HFP/WS2在分析体液离子特性方面具有广阔的应用前景。
