期刊
NANO ENERGY
卷 42, 期 -, 页码 232-240出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.10.055
关键词
Shell-isolated nanoparticles; Surface-enhanced spectroscopy; Plasmon-enhanced fluorescence; Quantum dots; Photoelectrochemical hydrogen evolution
类别
资金
- NSFC [21522508, 21521004, 21427813]
- Fundamental Research Funds for the Central Universities [20720150039]
- 111 Project [B16029, B17027]
- NFFTBS [J1310024]
- Thousand Youth Talents Plan of China
Optically tunable quantum dots (QDs) have drawn significant attention for optoelectronic applications such as light-emitting diodes, photovoltaics, and photodetectors. However, when QDs are assembled as films, the quantum yield decreases significantly, known as the self-quenching effect. In this study, we develop a general method for suppressing this self-quenching effect and enhancing energy conversion efficiency using shell-isolated nanoparticles (SHINs), which efficiently promote spontaneous emission of diverse QD films to picosecond timescale. We discover that Ag SHINs with controllable thickness shells exhibit different enhancement factors due to the competition between radiative and non-radiative decay, and localized surface plasmon resonance (LSPR) in nanocavities enhances the fluorescence of QD monolayer films up to nearly 1000 times by SHINs with 6 nm shell. In addition, acting as nanoantennas and amplifying the local photon density, SHINs also effectively enhance excitons excitation and improve the H-2 evolution performance of QD-PEC to nearly 12 mu mol/h in neutral solution without hot electrons effect.
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