UV/Ozone-Oxidized Large-Scale Graphene Platform with Large Chemical Enhancement in Surface-Enhanced Raman Scattering
SCIE
SCOPUS
- Title
- UV/Ozone-Oxidized Large-Scale Graphene Platform with Large Chemical Enhancement in Surface-Enhanced Raman Scattering
- Authors
- Sung Huh; Jaesung Park; Young Soo Kim; Kim, KS; Byung Hee Hong; Jwa-Min Nam
- Date Issued
- 2011-12
- Publisher
- American Chemical Society
- Abstract
- We fabricated a highly oxidized large-scale graphene platform using chemical vapor deposition (CVD) and UV/ozone-based oxidation methods. This platform offers a large-scale surface-enhanced Raman scattering (SERS) substrate with large chemical enhancement in SERS and reproducible SEAS signals over a centimeter-scale graphene surface. After UV-induced ozone generation, ozone molecules were reacted with graphene to produce oxygen-containing groups on graphene and induced the p-type doping of the graphene. These modifications introduced the structural disorder and defects on the graphene surface and resulted in a large chemical mechanism-based signal enhancement from Raman dye molecules [rhodamine B (RhB), rhodamine 6G (R6G), and crystal violet (CV) in this case] on graphene. Importantly, the enhancement factors were increased from similar to 10(3) before ozone treatment to similar to 10(4), which is the largest chemical enhancement factor ever on graphene, after 5 min ozone treatment due to both high oxidation and p-doping effects on graphene surface. Over a centimeter-scale area of this UV/ozone-oxidized graphene substrate, strong SERS signals were repeatedly and reproducibly detected. In a UV/ozone-based micropattern, UV/ozone-treated areas were highly Raman-active while nontreated areas displayed very weak Raman signals.
- Keywords
- graphene; oxidized graphene; ozone; surface-enhanced Raman scattering; chemical enhancement; CARBON NANOTUBES; OZONE OXIDATION; SPECTROSCOPY; NANOPARTICLES; ADSORPTION; SUBSTRATE; MOLECULES; SPECTRA; SILVER; SERS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17007
- DOI
- 10.1021/NN204156N
- ISSN
- 1936-0851
- Article Type
- Article
- Citation
- ACS NANO, vol. 5, no. 12, page. 9799 - 9806, 2011-12
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