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

Wang, Y.-L.; Liang, Shan; Li, M.; Wang, J.-H.; Peng, Xiaoniu; Yang, Zhong-Jian; Zhou, Li; Yu, Xueli; Wang, Q.-Q.

doi:10.1007/s11468-015-9880-y

Cited by 4 publications

(1 citation statement)

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“…For applications such as photovoltaic cells, photonic devices and photocatalysis, plasmonic materials (Au/Ag) are coupled with an optically active semiconductor/dielectric material to improve the device efficiency [6]. Such metal nanoparticle-semiconductor/dielectric nanohybrids or superstructures are well studied both theoretically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

Surface plasmon resonance induced enhancement of photoluminescence and Raman line intensity in SnS quantum dot-Sn nanoparticle hybrid structure

Warrier

Gandhimathi

2018

Methods Appl. Fluoresc.

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In this article, we report on enhancement in photoluminescence and Raman line intensity of SnS quantum dots embedded in a mesh of Sn nanostructures. SnS nanoparticles synthesized by homogenous precipitation method show strong quantum confinement with a band gap of ∼2.7 eV (blue shift of ∼1 eV compared to bulk SnS particles). The optical band gap of SnS quantum dots is controlled by varying the pH (∼0 to 2.25), ageing time (24 to 144 h) and molarity (0 to 2 M) of the precursors. These SnS nanoparticles are embedded in a mesh of Sn nanostructures which are synthesized from tin chloride by using sodium borohydride as reducing agent. The Sn nanostructures have a morphology dependent, tunable surface plasmon resonance (SPR), ranging from UV (∼295 nm) to visible region (∼400 nm) of the electromagnetic spectrum. In the SnS-Sn nanohybrids, the excitons are strongly coupled with plasmons leading to a shift in the excitonic binding energy (∼400 meV). The pure SnS quantum dots have a very weak photoluminescence peak at ∼560 nm and Raman shift of low intensity at 853.08 cm, 1078.17 cm, 1255.60 cm, 1466.91 cm. The coupling of SnS nanoparticles with Sn nanoparticles results in strong exciton-plasmon interactions leading to enhanced photoluminescence and Raman line intensity. The nanohybrids formed using Sn nanosheets whose SPR matches with absorption onset of the SnS nanoparticles shows an enhancement of ∼10 times higher than pure SnS nanoparticles. Thus, Sn nanosheet with surface plasmon resonance in visible region (400 nm) like Au and Ag is a promising material for surface enhanced Raman spectroscopy, plasmon assisted fluorescence imaging and for enhancing the emission intensity of semiconductors with weak emission intensity.

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Section: Introductionmentioning

confidence: 99%