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Noble Metallic Pyramidal Substrate for Surface-Enhanced Raman Scattering Detection of Plasmid DNA Based on Template Stripping Method

Authors :
Wenjie Wu
Rui Li
Maodu Chen
Jiankang Li
Weishen Zhan
Zhenguo Jing
Lu Pang
Source :
Micromachines, Vol 12, Iss 8, p 923 (2021)
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

In this paper, a new method for manufacturing flexible and repeatable sensors made of silicon solar cells is reported. The method involves depositing the noble metal film directly onto the Si template and stripping out the substrate with a pyramid morphology by using an adhesive polymer. In order to evaluate the enhancement ability of the substrate, Rhodamine 6G (R6G) were used as surface-enhanced Raman scattering (SERS) probe molecules, and the results showed a high sensitivity and stability. The limit of detection was down to 10−12 M for R6G. The finite-difference time domain (FDTD) was used to reflect the distribution of the electromagnetic field, and the electric field was greatly enhanced on the surface of the inverted pyramidal substrate, especially in pits. The mechanism of Raman enhancement of two types of pyramidal SERS substrate, before and after stripping of the noble metal film, is discussed. By detecting low concentrations of plasmid DNA, the identification of seven characteristic peaks was successfully realized using a noble metallic pyramidal substrate.

Details

Language :
English
ISSN :
2072666X
Volume :
12
Issue :
8
Database :
Directory of Open Access Journals
Journal :
Micromachines
Publication Type :
Academic Journal
Accession number :
edsdoj.4d676372df4d475a9fb5c5e546c5ad81
Document Type :
article
Full Text :
https://doi.org/10.3390/mi12080923