In situ SERS study of surface plasmon resonance enhanced photocatalytic reactions using bifunctional Au@CdS core–shell nanocomposites

Abstract

Surface plasmon resonance (SPR) has been utilized in many fields, such as surface-enhanced Raman spectroscopy (SERS) and solar energy conversion. Here we developed an Au@CdS core-shell nanostructure, a bifunctional nanoparticle, used as an efficient catalyst for SPR enhanced photocatalytic degradation, and as a substrate for in situ SERS detection of methylene blue (MB) and p-nitrophenol (pNTP). With integration of an Au nanoparticle into a CdS shell, the degradation process was significantly accelerated under 500 nm long-pass (λ > 500 nm) visible light irradiation, which was caused by the injection of hot electrons. Moreover, a highly uniform, monolayer film of Au@CdS nanoparticles (NPs) has been prepared and used as both a SERS substrate and catalyst. The decomposition of MB molecules and nitrogen coupling reaction of pNTP were observed during the 638 nm laser illumination. We demonstrate that a plasmonic core-semiconductor shell nanocomposite can be a promising material for photocatalysis and in situ SERS study.

Electromagnetic Field in Hybrid Quantum Plasmonic-Photonic Systems

“…Optoelectronics hybrid nano-networks can be studied by combining Quantum Mechanics and Maxwell's equations. This area of research is nowadays very active and typical examples from recent research include studies of metamaterials with unusual optical properties [55][56][57][58], bifunctional nanocomposites probed by SERS [59] and generation of entangled photons [60]. In this short review, we have focused on conceptual advances for FRET, modified spontaneous emission and SERS.…”

SERS detection of heterogeneous reactions at catalytic interfaces using bifunctional metal nanoparticles

“…除了以上介绍的双功能金属纳米结构之外, 也包 括Au/Ag增强基底和金属硫化物 [71,72] /氧化物 [73] /卤化 物 [74] 形成的纳米结构, 如Yang等 [71] 制备的Au-CdS核壳 图 10 (a) CO在SHINERS结构上的氧化过程示意图; (b) PtFe和Fe催化CO氧化的SHINERS谱图; (c) 不同温度下, Pd 催化CO氧化的SHINERS谱图 [28] (网络版彩图)…”

Shell‐Isolated Nanoparticle‐Enhanced Raman and Fluorescence Spectroscopies: Synthesis and Applications

“…As a result, Au nanoparticles are encapsulated in MIL‐101. In addition to the MOF shell, CdS was also used to coat on the Au nanoparticles . To obtain Au@CdS nanoparticles with different shell thicknesses (Figure d), cadmium chloride and sodium citrate were dissolved in DI water, and ammonia was added to adjust the solution pH to 10, followed by the addition of thiourea and incubation at 70 °C for different reaction times.…”

“…Copyright 2014, American Chemical Society. (d) Reproduced with permission . Copyright 2017, the Royal Society of Chemistry.…”