Chatterjee, SSChatterjeeSaha, SSSahaBarman, SRSRBarmanKhan, IIKhanPao, YPYPPaoLEE, S.S.LEEChoi, DDChoiZONG-HONG LIN2023-03-022023-03-0220202211-2855https://scholars.lib.ntu.edu.tw/handle/123456789/628887Triboelectric nanogenerators (TENGs) and triboelectric nanosensors (TENSs) are the prime backbones for the realization of environmental mechanical energy harvesting and self-powered sensing applications. However, the low efficiency of concurrent solid-solid contact electrification creates a major bottleneck for the growth of highly promising technologies. To address this problem, herein, we report a strategic protocol to design a TENS by solid-liquid contact electrification for chemical sensing purposes as well as an efficient approach for the chemical enhancement of solid-liquid TENGs. In particular, TiO2 nanosheet arrays and various solvents (including water, ethanol and acetone) are employed as solid triboelectric materials and contact liquids, respectively, for the demonstration of solid-liquid contact electrification for mechanical energy harvesting and catechin detection. As a self-powered sensor, the TiO2 nanosheet array-based TENS provides superior advantages such as long-term stability, frequency-independent output and humidity-insensitive properties compared to previously reported solid-solid TENSs. The chemically enhanced sensing mechanism of the TiO2 nanosheet array-based TENS for catechin detection is further confirmed with the decrease in the work function and can provide a wide linear window (100 nM–100 μM) and a low detection limit (30 nM). All the results support that solid-liquid TENSs pave a new path toward efficient self-powered sensors for environmental and healthcare monitoring.Contact electrification; Chemical enhancement; Triboelectric nanogenerator; TiO2; Self-powered sensor; Catechin; TEA CATECHINS; ENERGY; NANOGENERATORS; ARRAYS; WATER; NANOPARTICLES; PRESSURE; SENSOR; MODEL; FOILjournal article10.1016/j.nanoen.2020.1050932-s2.0-85088530767WOS:000581738300017https://api.elsevier.com/content/abstract/scopus_id/85088530767