Competitive adsorption of residual polyvinylpyrrolidone and detection molecular on flower liked silver nanoparticles

Ziyang Shang; Liang Li; De Zhang; Cai-E Wang; Zhexiang Tang; Mingqiang Zou; Huaping Gong; Zhi Yu; Shangzhong Jin; Pei Liang

doi:10.1016/j.saa.2021.119717

Competitive adsorption of residual polyvinylpyrrolidone and detection molecular on flower liked silver nanoparticles

Spectrochim Acta A Mol Biomol Spectrosc. 2021 Jul 5:255:119717. doi: 10.1016/j.saa.2021.119717. Epub 2021 Mar 23.

Authors

Ziyang Shang¹, Liang Li¹, De Zhang², Cai-E Wang³, Zhexiang Tang¹, Mingqiang Zou⁴, Huaping Gong¹, Zhi Yu⁵, Shangzhong Jin¹, Pei Liang⁶

Affiliations

¹ College of Optical and Electronic Technology, China Jiliang University, 310018 Hangzhou, China.
² College of Optical and Electronic Technology, China Jiliang University, 310018 Hangzhou, China; Key Laboratory of Urban Agriculture in Central China, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, 430070 Wuhan, China.
³ Department of Pharmacy, the First Affiliated Hospital, and College of Clinical Medicine of Henan University of Science and Technology, Luoyang 471003, China.
⁴ Chinese Academy of Inspection and Quarantine (CAIQ), No.A 3, Gaobeidian Road, Chaoyang District, Beijing 100123, China; China Inspection Laboratory Technologies Co. Ltd (CILT), No.A 3, Gaobeidian Road, Chaoyang District, Beijing 100123, China.
⁵ Key Laboratory of Urban Agriculture in Central China, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, 430070 Wuhan, China.
⁶ College of Optical and Electronic Technology, China Jiliang University, 310018 Hangzhou, China. Electronic address: plianghust@gmail.com.

PMID: 33794423
DOI: 10.1016/j.saa.2021.119717

Abstract

The silver nanoparticles have been frequently used in SERS detection, for their unique optical properties and sensitive surface Raman enhancement properties. However, as the preparation of silver nanoparticles will use polyvinylpyrrolidone (PVP) to achieve the effect of reducing agent and surfactant, the surface of the prepared silver nanoparticles will be wrapped by PVP, forming an insulating layer and an ill-defined AgNPs interface, which limits the plasmonic coupling between the laminates of AgNPs. This paper reported a simple method to remove PVP for high performance and reusable SERS substrate, and the residue of PVP was studied after clean centrifugal by ethanol or water. When the number of cleaning times reached 10, there was basically no residual of PVP. The cleaned AgNPs interface effectively enhanced the plasma resonance of the local surface (LSPR) and greatly improved the SERS activity of the substrate. Moreover, probe molecules (R6G) are introduced to study the influence of single molecule PVP on subsequent detection. Through the competitive relationship between the two, it can be concluded that residual PVP has basically no influence on detection of the molecular which absorbed stronger than PVP, and the remaining PVP can be ignored.

Keywords: Competitive adsorption; Residual PVP; SERS; Silver nanoparticles.