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A single light spot GC detector employing localized surface plasmon resonance of porous Au@SiO2 nanoparticle multilayer

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Abstract

This paper describes the synthesis of a nano-porous multilayered film consisting of Au@SiO2 nanoparticles. This film was used to miniaturize the size of a localized surface plasmon resonance (LSPR)-based capillary gas chromatograph (GC) detector. A layer-by-layer (LbL) approach with proper surface reaction sequences was used to create a multilayer structure that consisted of as many as five layers of Au@SiO2 nanoparticles. The center wavelength of LSPR was shifted from 520 to 634 nm due to the approximation of additional layers of nanoparticles. The vapor response time for this Au@SiO2 multilayer LSPR sensor was identical to that of an Au nanoparticle monolayer, which confirmed that this multilayer structure has a high level of gas permeability. The multilayer was synthesized inside a glass capillary for use as a GC detector. Due to the enhancement of absorbance, the gas chromatographic signal was obtained via a single spotlight that penetrated one side of the glass capillary and was then reflected by a silver mirror coated on the opposite side. The detection limits were ≤20 ng for cyclohexanone and m-xylene.

Graphical abstract: A single light spot GC detector employing localized surface plasmon resonance of porous Au@SiO2 nanoparticle multilayer

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Publication details

The article was received on 08 Oct 2018, accepted on 29 Nov 2018 and first published on 30 Nov 2018


Article type: Paper
DOI: 10.1039/C8AN01921E
Citation: Analyst, 2019, Advance Article
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    A single light spot GC detector employing localized surface plasmon resonance of porous Au@SiO2 nanoparticle multilayer

    P. Lin, G. Le, Wei-I. Chiu, R. Jian and C. Lu, Analyst, 2019, Advance Article , DOI: 10.1039/C8AN01921E

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