Synthesis of Au–CdS Core–Shell Hetero‐Nanorods with Efficient Exciton–Plasmon Interactions

Abstract

The synthesis of large lattice mismatch metal-semiconductor core-shell hetero-nanostructures remains challenging, and thus the corresponding optical properties are seldom discussed. Here, we report the gold-nanorodseeded growth of Au-CdS core-shell hetero-nanorods by employing Ag 2 S as an interim layer that favors CdS shell formation through a cation-exchange process, and the subsequent CdS growth, which can form complete coreshell structures with controllable shell thickness. Exciton-plasmon interactions observed in the Au-CdS nanorods induce shell thickness-tailored and red-shifted longitudinal surface plasmon resonance and quenched CdS luminescence under ultraviolet light excitation. Furthermore, the Au-CdS nanorods demonstrate an enhanced and plasmon-governed two-photon luminescence under near-infrared pulsed laser excitation. The approach has potential for the preparation of other metal-semiconductor hetero-nanomaterials with complete core-shell structures, and these Au-CdS nanorods may open up intriguing new possibilities at the interface of optics and electronics.

Porous Au–Ag Alloy Particles Inlaid AgCl Membranes As Versatile Plasmonic Catalytic Interfaces with Simultaneous, in Situ SERS Monitoring

“…[6][7][8][9][10][11][12] On the other hand, another powerful spectroscopic technique based mainly on rough surfaces of noble metal nano-structures, the surface-enhanced Raman scattering (SERS) spectroscopy, has also been introduced into plasmonic photocatalytic systems recently, and so far triggered several promising applications like the photocatalytic degradation induced self-cleaning and recyclable SERS platforms, [13][14][15][16] or inversely, the in-situ SERS monitoring of plasmon-enhanced catalytic reactions. [17][18][19][20] SERS spectroscopy, as a quite helpful tool for trace detection of organic contaminants with high sensitivity and rapid response, [21][22][23] exhibits great superiority over traditionally utilized non-surface-selective UV−visible (UV−vis) absorption spectroscopy for monitoring catalytic reactions.…”

Tunable Plasmon Resonance and Fluorescence of Au/ZnS/CdS Core/Shell Nanorods

“…It was known that a quenching of the PL intensities is responsible for a too close distance between the Au cores and the CdS shells. The corresponding PL properties in the Au/CdS core/shell nanorods have been discussed in detail by our group previously [19].…”

“…The interactions between the nanoscalespaced metal and semiconductor components can greatly improve the overall application performance of the heteronanostructures and can even generate new synergetic properties [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. For example, in metal-semiconductor core/shell nanostructures, the coated semiconductor shells can improve the thermal stability and tailor the surface plasmon resonance (SPR) of the metal cores [16].…”

Au nanoparticle-decorated ultrathin CdS nanowires for high-efficiency photodegradation of organic dyes

“…When the loading amount of 20 nm Au is 3.2 wt%, the Au NPs-CdS NWs perform the highest photocatalytic activity, and more Au NPs or less Au NPs will result in the descent of the activity. As is well known that Au NPs can enhance the absorption of light and the separation of photoinduced hole and electron pairs, which can significantly improve the photocatalytic performance [40,41].…”