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Fluorinated graphene films for Ultra-High sensitivity of Surface-Enhanced Raman scattering

Single layer of fluorinated graphene film with ultra-high SERS was designed by fluorination reaction between graphene and active F atoms derived from fluorocarbon using CVD method. [Display omitted] •Sub-centimetered graphene sheet was prepared on Cu foil surface by NH3-plasma assistance.•Fluorinate...

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Bibliographic Details
Published in:Applied surface science 2023-04, Vol.616, p.156496, Article 156496
Main Authors: Que, Longkun, Ai, Jianping, Shao, Taihuan, Han, Ruipeng, Su, Junhua, Guo, Yifan, Liu, Yifan, Li, Jinyang, Jian, Xian, Zhou, Zuowan
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Language:English
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Summary:Single layer of fluorinated graphene film with ultra-high SERS was designed by fluorination reaction between graphene and active F atoms derived from fluorocarbon using CVD method. [Display omitted] •Sub-centimetered graphene sheet was prepared on Cu foil surface by NH3-plasma assistance.•Fluorinated-graphene was designed by a safety fluorination through a CVD process.•Fluorinated-graphene-enhanced Raman scattering exhibited high sensitivity and good stability. It is of great importance to design large-area and high-quality graphene and its derivatives for the application in surface-enhanced Raman scattering (SERS) with high sensitivity and good stability. The efficiently preparation and accurately regulation of these structures remain great challenges. Herein, fluorinated graphene (fGE) for high-performance SERS is developed by a facile fluorination on a sub-centimeter graphene. With precisely controlling the nucleation density of the graphene growth by NH3-plasma assistance, this large-area graphene (GE) was obtained on Cu foil. Then GE reacted with the derived F atoms from fluorocarbon in a tube furnace at 600 °C. SERS results demonstrate that the fGE films exhibit extraordinary Rhodamine 6G (R6G) molecular SERS sensitivity limit as low as 10−9 mol/L (M) by tuning the F/C ratio of the fGE in range of 0.024–0.234. The Raman intensity of probe molecules adsorbed on as-prepared fGE revealed a slight decrease to 98.2 % for R6G on fGE as long as 50 days, demonstrating good stability for fluorinated-graphene-enhanced Raman scattering (FGERS). Furthermore, theoretical calculations also indicate that the energy of a specific laser matches the gap between the lowest unoccupied molecular orbital (LUMO) of as-designed probe molecule (Rhodamine 6G, Methylene Blue) and Fermi level of fGE, which favors SERS chemical enhancement. This large-scale preparation of FGERS substrates with outstanding sensitivity opens a light way for potential SERS substances.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2023.156496