ZONG-HONG LINXie, YannanYannanXieYang, YaYaYangWang, SihongSihongWangZhu, GuangGuangZhuWang, Zhong LinZhong LinWang2023-03-202023-03-202013-05-281936-0851https://scholars.lib.ntu.edu.tw/handle/123456789/629408Mechanical energy harvesting based on triboelectric effect has been proven to be a simple, cost-effective, and robust method for electricity generation. In this study, we developed a rationally designed triboelectric nanogenerator (TENG) by utilizing the contact electrification between a polytetrafluoroethylene (PTFE) thin film and a layer of TiO2 nanomaterial (nanowire and nanosheet) array. The as-developed TENG was systematically studied and demonstrated as a self-powered nanosensor toward catechin detection. The high sensitivity (detection limit of 5 μM) and selectivity are achieved through a strong interaction between Ti atoms of TiO2 nanomaterial and enediol group of catechin. The output voltage and current density were increased by a factor of 5.0 and 2.9, respectively, when adsorbed with catechin of a saturated concentration, because of the charge transfer from catechin to TiO2. This study demonstrates the possibility of improving the electrical output of TENG through chemical modification.enTiO2; catechin; nanosensor; chemical modification; triboelectric effect; charge transfer; CONTACT ELECTRIFICATION; TITANIUM-DIOXIDEjournal article10.1021/nn401256w235970182-s2.0-84878279584WOS:000319856300096https://api.elsevier.com/content/abstract/scopus_id/84878279584