One-step synthesis of Au-coated porous silicon as a surface enhanced Raman scattering substrate for biomolecule detection

•Gold coated porous silicon was synthesized by an electrochemical etching of silicon.•The porosity and surface morphology are studied by SEM, Raman and PL analysis.•Optical sensing capability of Au-pSi and bare pSi were validated using Raman.•Au-pSi shown higher sensitivity for R6G dye and BSA biomo...

Full description

Saved in:
Bibliographic Details
Published in:Materials letters 2017-10, Vol.204, p.115-119
Main Authors: Kalimuthu, Vijayarangamuthu, Rath, Shyama
Format: Article
Language:English
Subjects:
Bovine serum albumin
Electrochemical etching
Etching
Gold
Materials science
Photoluminescence
Porous silicon
Raman
Raman spectra
Rhodamine 6G
Sensitivity analysis
Sensor
SERS
Serum albumin
Silicon
Silicon substrates
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Gold coated porous silicon was synthesized by an electrochemical etching of silicon.•The porosity and surface morphology are studied by SEM, Raman and PL analysis.•Optical sensing capability of Au-pSi and bare pSi were validated using Raman.•Au-pSi shown higher sensitivity for R6G dye and BSA biomolecule as compared to pSi.•Raman signal enhancement in Au-pSi was related to electromagnetic SERS mechanism. Porous silicon (pSi) coated with gold (Au) was synthesized by a one-step electrochemical etching process without any post treatment. The porous nature was confirmed by scanning electron microscopy (SEM) as well as Raman and photoluminescence spectroscopy. The surface enhanced Raman spectroscopic (SERS) sensing performance of Au-coated pSi (Au-pSi) was compared with uncoated pSi by using rhodamine 6G dye as the analyte. The bio-sensing performance of Au-pSi was evaluated using bovine serum albumin (BSA) protein as the analyte. The Au-pSi shown better sensitivity for R6G and BSA as compared to pSi.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2017.06.030