Shim, Jaeho Kim, Jung Kyu Lee, Kyu Seung Lee, Chang-Lyoul Ma, Ming Choi, Won Kook Hwang, Jun Yeon Yang, Hee Yeon Angadi, Basavaraj Park, Jong Hyeok Yu, Kyoungsik Son, Dong Ick 2024-01-20T04:01:26Z 2024-01-20T04:01:26Z 2021-09-04 2016-07 2211-2855 https://pubs.kist.re.kr/handle/201004/123923 This work reports on the in-situ chemical synthesis and their properties of multilayer graphene (MLG) shells, made by unzipping single walled carbon nanotubes (SWCNTs), on the surface of Zinc oxide (ZnO) core nanoparticles (NPs). The stable oxygen bridge bonds between the ZnO core and the oxygen-related functional groups on the MLG shells facilitate the efficient photoinduced charge separation. This charge separation mechanism is confirmed experimentally using time-correlated single photon counting (TCSPC) measurements. The calculated average carrier lifetimes of the ZnO@MLG NPs are approximately 102 times faster than those for the bare ZnO NPs. The efficient electron transfer between the ZnO core and the MLG shell resulted in the significant improvement of the photocatalytic activity and the photoelectrochemical response. Simultaneously, the photocorrosion of ZnO was prevented by having the oxygen bridge bonds between the ZnO and MLG which suppressed the photo-generated holes oxidizing the surface oxygen atoms on ZnO, and in turn the holes are consumed by photocatalytic reaction. The 4.3 times enhanced photocurrent density at 0.2 V vs. Ag/AgCl (pH 6.9) and around 10 times higher rate constant value of photodegradation of rhodamine B were achieved by ZnO@MLG NPs in comparison with those of bare ZnO NPs. (C) 2016 Elsevier Ltd. All rights reserved. English ELSEVIER SCIENCE BV QUANTUM DOTS PHOTOCATALYTIC DEGRADATION VISIBLE-LIGHT PHOTOELECTROCHEMICAL RESPONSES OXIDE TIO2 DYE PHOTOLUMINESCENCE NANOCOMPOSITES STABILITY A facile chemical synthesis of ZnO@multilayer graphene nanoparticles with fast charge separation and enhanced performance for application in solar energy conversion Article 10.1016/j.nanoen.2016.04.031 1 NANO ENERGY, v.25, pp.9 - 17 NANO ENERGY 25 9 17 scie scopus 000378020200002 2-s2.0-84989277358 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article QUANTUM DOTS PHOTOCATALYTIC DEGRADATION VISIBLE-LIGHT PHOTOELECTROCHEMICAL RESPONSES OXIDE TIO2 DYE PHOTOLUMINESCENCE NANOCOMPOSITES STABILITY ZnO@multilayer graphene core@shell nanoparticles Charge separation Photoelectrochemistry Solar energy conversion Chemical synthesis