Journal
ACS NANO
Volume 7, Issue 5, Pages 4554-4560Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn401256w
Keywords
TiO2; catechin; nanosensor; chemical modification; triboelectric effect; charge transfer
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Funding
- Airforce, MURI, U.S. Department of Energy, Office of Basic Energy Sciences [DE-FG02-07ER46394]
- NSF, Taiwan [NSC 101-2917-I-564-029]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KJCX2-YW-M13]
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Mechanical 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 mu M) 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.
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