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

Haoming Bao1, Hongwen Zhang, Hao Fu

  • 1Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China. hwzhang@issp.ac.cn wpcai@issp.ac.cn.

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|February 20, 2020
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A new method called ultrathin layer solid transformation-enabled (ULSTE)-SERS enables sensitive detection of harmful small gaseous molecules (h-SGMs). This technique transforms target gases into detectable materials using surface-enhanced Raman spectroscopy (SERS).

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Detecting trace harmful small gaseous molecules (h-SGMs) is crucial but challenging due to their low Raman cross section (RCS) and weak metal affinity.
  • Surface-enhanced Raman spectroscopy (SERS) is a promising technique, but its application for h-SGMs is limited by inherent molecular properties.

Purpose of the Study:

  • To introduce a novel SERS strategy, ultrathin layer solid transformation-enabled (ULSTE)-SERS, for the ultrasensitive detection of trace h-SGMs.
  • To demonstrate the effectiveness of ULSTE-SERS using hydrogen sulfide (H₂S) as a target analyte.
  • To explore the universality and practical applicability of the proposed method for various h-SGMs.

Main Methods:

  • Development of an ultrathin layer solid sensing material coated on a plasmonic metal SERS substrate.
  • Utilizing an in situ chemical reaction between the target h-SGM and the sensing layer to produce a new solid matter with a large RCS.
  • Detection of the transformed solid matter using SERS for quantitative analysis.

Main Results:

  • Successfully detected trace H₂S gas using an ultrathin CuO layer on Au nanoparticles, achieving detection limits down to parts per billion (ppb) or even parts per trillion (ppt) levels within 10 minutes.
  • Demonstrated the universality of the ULSTE-SERS strategy for detecting other h-SGMs like SO₂, CS₂, CH₃SH, and HCl by employing appropriate sensing materials.
  • Confirmed the suitability of ULSTE-SERS for unstable molecules and portable applications due to the stable solid sensing layer.

Conclusions:

  • The ULSTE-SERS strategy offers a highly efficient and sensitive approach for detecting trace h-SGMs.
  • This method overcomes the limitations of traditional SERS for molecules with small RCS and weak metal affinity.
  • The developed technique shows significant potential for practical applications in environmental monitoring and safety detection.