4.7 Article

Ag nanocubes monolayer-modified PDMS as flexible SERS substrates for pesticides sensing

Journal

MICROCHIMICA ACTA
Volume 189, Issue 6, Pages -

Publisher

SPRINGER WIEN
DOI: 10.1007/s00604-022-05328-z

Keywords

Ag Nanocubes; Interface self-assemble; Flexible SERS substrates; Thiram

Funding

  1. National Natural Science Foundation of China [51672074, 11774082, 11975093]
  2. Natural Science Foundation of Hubei Province, China [2019CFA006]
  3. Program for Science and Technology Innovation Team in Colleges of Hubei Province [T201901]

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The Ag NCs/PDMS substrate fabricated by self-assembly method showed high SERS activity and was successfully used for quantitative detection of thiram. It also demonstrated excellent detection ability for thiram residues on apple samples.
A new approach is presented to fabricate flexible surface-enhanced Raman scattering (SERS) substrate of Ag nanocubes monolayer-modified polydimethylsiloxane (Ag NCs/PDMS) through a powerful three-phase interface self-assemble method. The morphologies and crystal structures were characterized by scanning electron microscopy and X-ray diffraction. The self-assembled Ag NCs/PDMS substrate exhibited high SERS activity and good signal homogeneity, which was successfully used for quantitative detection of thiram; the detection limit reached 10 ng/mL, and the linear range is 10-1000 ng/mL. Furthermore, the flexible SERS substrates were successfully employed to detect thiram residues on factual apple samples, and trace amount (1 ng/cm(2)) of thiram residues was detected on apple peels. The excellent SERS detection ability of self-assembled Ag NCs/PDMS substrate indicated that it will play an important role in pesticide detection in the future. Graphical abstract

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