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Ultrathin layer solid transformation-enabled surface enhanced Raman spectroscopy for trace harmful small gaseous molecules

Abstract

Detection of trace harmful small gaseous molecules (or h-SGMs), based on surface enhanced Raman spectroscopy (SERS), has been expected but in challenge due to the extremely small Raman cross section (RCSs) and weak metal affinity of the h-SGMs. Here, a new strategy, ultrathin layer solid transformation-enabled (ULSTE)-SERS, is proposed. It uses the chemical reaction between the target h-SGM and an ultrathin layer of solid sensing matter coated on a plasmonic metal SERS substrate. This reaction in situ produces a new solid matter with large RCS, which ensures the detection of trace h-SGMs via SERS. The validity of this strategy has been demonstrated by detecting trace H2S gas with ultrathin CuO layer-wrapped Au nanoparticles (NP). Furthermore, this strategy allows fast and ultrasensitive detection. The detection limit can be down to ppb (even ppt) levels with a 10 min preprocessing. Importantly, this strategy has good universality for various other h-SGMs, such as SO2, CS2, CH3SH, and HCl, etc., via using appropriate sensing matters. Additionally, the ULSTE-SERS is also very suitable for vulnerable molecules and fast portable detection due to the stable solid layer. This work provides highly efficient SERS-based detection of trace h-SGMs, which is easily applied in practical.

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Supplementary files

Article information


Submitted
20 Dec 2019
Accepted
04 Feb 2020
First published
05 Feb 2020

Nanoscale Horiz., 2020, Accepted Manuscript
Article type
Communication

Ultrathin layer solid transformation-enabled surface enhanced Raman spectroscopy for trace harmful small gaseous molecules

H. Bao, H. Zhang, H. Fu, L. Zhou, P. Zhang, Y. Li and W. Cai, Nanoscale Horiz., 2020, Accepted Manuscript , DOI: 10.1039/C9NH00799G

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