Honeycomb-like Ag Nanocavity Array for SERS Observations Using Plasmon-Mediated Chemical Reactions

Yongjun Zhang; Zhen Xu; Jiahong Wen; Xiaoyu Zhao; Renxian Gao; Yaxin Wang

doi:10.3390/mi14101811

Honeycomb-like Ag Nanocavity Array for SERS Observations Using Plasmon-Mediated Chemical Reactions

Micromachines (Basel). 2023 Sep 22;14(10):1811. doi: 10.3390/mi14101811.

Authors

Yongjun Zhang¹, Zhen Xu¹, Jiahong Wen², Xiaoyu Zhao^{1

3}, Renxian Gao⁴, Yaxin Wang^{1

3}

Affiliations

¹ School of Material and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
² The College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China.
³ Zhejiang Laboratory, Hangzhou 311100, China.
⁴ Department of Physics, Xiamen University, Xiamen 361005, China.

Abstract

Organized two-dimensional polystyrene bead arrays perform ion etching, and protruding nanostructures are created on polystyrene beads due to the shadow effects from the ring beads, leading to nucleus selection and growth in Au nanostructure deposition. Ag nanostructures are prepared via plasmon-mediated chemical reactions (PMCRs), leading to the Ag nanocavity geometry of the honeycomb pattern when the etching time and Ag growth time are tuned. Due to the strong electromagnetic coupling, the Ag honeycomb-shaped nanocavity array works as the SERS substrate with high sensitivity and good repeatability, which is used to detect thiram pesticide residues with a concentration down to 10^-9 M.

Keywords: Ag growth; LSPR; PMCRs; SERS.

Grants and funding

This research was funded by the National Natural Science Foundation of China (Nos. 51901060, 12004090); the National Natural Science Foundation of Zhejiang Province (Nos. LY21E010004, LQ21A040009); the Fundamental Research Funds for the Provincial Universities of Zhejiang (Nos. GK239909299001-007, GK209907299001-025); the Key Research Project of Zhejiang Lab (Nos. 2022MH0AC01, 2022MG0AB02).