• Chemical vapour deposited graphene: substrate pre-treatment, growth and demonstration as a simple graphene-based SERS substrate

• # Fulltext

https://www.ias.ac.in/article/fulltext/boms/043/0133

• # Keywords

CVD; graphene; polishing; surface-enhanced Raman spectroscopy.

• # Abstract

In chemical vapour deposition (CVD) of graphene, surface roughness and purity of the copper substrate are very crucial for obtaining uniform films. Even though electrochemical polishing is an effective technique for obtaininghomogeneous graphene films, most of the experiments adopt complex experimental parameters like electrolyte heating, stirring and use of additives for better results. These are not applicable to thin copper foils used in CVD of graphene. In the present study, a simple electrochemical procedure is developed for deposition of high-quality graphene films with good coverage. The depositions of graphene films on bare and polished copper foils for the same growth conditions are analysed using various microscopic techniques. The uniformly grown graphene on copper is then directly employed as a surface-enhanced Raman scattering (SERS) substrate along with plasmonic silver nanoparticles. A simple SERS substrate having a reasonable detection limit of 10$^{−10}$ M for R6G is achieved with uniform SERS signals over a large area. Thehomogeneity of SERS substrate can be attributed to the uniformity of the deposited graphene film. A simple and efficient SERS substrate using conventional methods is achieved through the incorporation of chemical vapour deposited graphene. The study covers the growth of CVD graphene film starting from substrate pre-treatment, various analyses of the film andfinally the application in SERS.

• # Author Affiliations

S NALINI1 2 S THOMAS1 3 M K JAYARAJ4 5 6 K R KUMAR1 5 6

1. Department of Instrumentation, Cochin University of Science and Technology, Cochin 682022, India
2. Department of Physics, Sree Narayana College, Alappuzha 688582, India
3. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, India
4. Department of Physics, Cochin University of Science and Technology, Cochin 682022, India
5. Centre of Excellence in Advanced Materials, Cochin University of Science and Technology, Cochin 682022, India
6. Inter University Centre for Nanomaterials and Devices, Cochin University of Science and Technology, Cochin 682022, India

• # Bulletin of Materials Science

Volume 44, 2021
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020