Plasmonic Enhancement of Photoenergy Conversion in the Visible Light Region Using PbS Quantum Dots Coupled with Au Nanoparticles

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• 作者：Xiaowei Li ; Kentaro Suzuki ; Takahiro Toda ; Satoshi Yasuda ; Kei Murakoshi
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：September 24, 2015
• 年：2015
• 卷：119
• 期：38
• 页码：22092-22101
• 全文大小：649K
• ISSN：1932-7455

文摘

Characteristic plasmon-induced enhancement of photocurrent has been observed by coupling PbS quantized particles (PbS QDs) with Au nanoparticles. A controlled size of ultrasmall PbS QDs modified with distinct ligands of 3-mercaptopropionic acid (MPA) or oleic acid was used to construct plasmon-active electrodes for three-electrode electrochemical measurements. The enhanced photoelectrochemical response of PbS QDs excited by localized surface plasmon resonance was observed at a relatively wide wavelength region. MPA capped the smaller PbS QD results in the enhancements of photocurrent at shorter wavelength light illumination below 500 nm where the plasmonic enhancement generally competes with multiexciton generation. The size-dependent resonance of PbS QDs with Au nanoparticles was discussed considering the energy of localized surface plasmon of the coupled system.