Issue 4, 2024

Polyacrylonitrile as a versatile matrix for gold nanoparticle-based SERS substrates

Abstract

As an effective and ultrasensitive molecule detection technique, surface-enhanced Raman spectroscopy (SERS) needs efficient and highly responsive substrates to further enhance its sensitivity and utility. In this work, the preparation and characterisation of polyacrylonitrile/gold nanoparticle (PAN/AuNPs) composite porous films have been described for SERS-based detection of methylene blue (MB) dye. The PAN/AuNPs composite films were prepared with a simple dip coating technique, yielding a highly porous structure with uniformly dispersed Au nanoparticles (AuNPs). Scanning electron microscopy (SEM) revealed a linked pore network within the films. In X-ray diffraction (XRD), the characteristic crystal peak of AuNP clusters was observed, proving the presence of AuNPs in the composite. UV-vis absorption spectra also indicated the existence of the AuNPs. The methylene blue (MB) dye has been detected using PAN/AuNPs composite SERS substrates. These substrates showed excellent sensitivity by detecting 50 nM dye concentration and enhancing the Raman peak intensity at 1622 cm−1. The SERS enhancement factor (EF) for MB detection was determined to be around 106, demonstrating the remarkable sensitivity of the PAN/AuNPs composite porous films. The findings demonstrate the enormous potential of PAN/AuNPs composite porous films as reliable SERS substrates, displaying their efficacy in detecting trace levels of analytes in chemical and biological sensing applications.

Graphical abstract: Polyacrylonitrile as a versatile matrix for gold nanoparticle-based SERS substrates

Article information

Article type
Communication
Submitted
13 Dec 2023
Accepted
18 Jan 2024
First published
18 Jan 2024
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2024,6, 1065-1073

Polyacrylonitrile as a versatile matrix for gold nanoparticle-based SERS substrates

S. Sharma, R. Kumar and R. M. Yadav, Nanoscale Adv., 2024, 6, 1065 DOI: 10.1039/D3NA01112G

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