Surface-Enhanced Raman Scattering Based on Controllable-Layer Graphene Shells Directly Synthesized on Cu Nanoparticles for Molecular Detection.
Graphene shells with a controllable number of layers were directly synthesized on Cu nanoparticles (CuNPs) by chemical vapor deposition (CVD) to fabricate a graphene-encapsulated CuNPs (G/CuNPs) hybrid system for surface-enhanced Raman scattering (SERS). The enhanced Raman spectra of adenosine and rhodamine 6G (R6G) showed that the G/CuNPs hybrid system can strongly suppress background fluorescence and increase signal-to-noise ratio. In four different types of SERS systems, the G/CuNPs hybrid system exhibits more efficient SERS than a transferred graphene/CuNPs hybrid system and pure CuNPs and graphene substrates. The minimum detectable concentrations of adenosine and R6G by the G/CuNPs hybrid system can be as low as 10(-8) and 10(-10)  M, respectively. The excellent linear relationship between Raman intensity and analyte concentration can be used for molecular detection. The graphene shell can also effectively prevent surface oxidation of Cu nanoparticles after exposure to ambient air and thus endow the hybrid system with a long lifetime. This work provides a basis for the fabrication of novel SERS substrates.
School of Physics and Electronics, Shandong Normal University, 250014 Jinan (P. R. China).
Hengwei
H
Qiu
School of Physics and Electronics, Shandong Normal University, 250014 Jinan (P. R. China).
Yanyan
Y
Huo
School of Physics and Electronics, Shandong Normal University, 250014 Jinan (P. R. China).
Zhen
Z
Li
School of Physics and Electronics, Shandong Normal University, 250014 Jinan (P. R. China).
Chao
C
Zhang
School of Physics and Electronics, Shandong Normal University, 250014 Jinan (P. R. China).
Peixi
P
Chen
School of Physics and Electronics, Shandong Normal University, 250014 Jinan (P. R. China). jiang_sz@126.com.
Shouzhen
S
Jiang
College of Physics and Electronic Information, Shandong Provincial Key Laboratory of Functional, Macromolecular Biophysics, Institute of Biophysics, Dezhou University, 253023 Dezhou (P. R. China).
Shicai
S
Xu
School of Physics and Electronics, Shandong Normal University, 250014 Jinan (P. R. China).
Yong
Y
Ma
School of Physics and Electronics, Shandong Normal University, 250014 Jinan (P. R. China).
Shuyun
S
Wang
Department of Radiation Oncology, Key Laboratory of Radiation Oncology of Shandong Province, Shandong Cancer Hospital and Institute, 250117 Jinan (P. R. China).
Hongsheng
H
Li
D003300:Copper / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D053768:Metal Nanoparticles; D018625:Microscopy, Atomic Force; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
D006108:Graphite; D003300:Copper
Raman spectroscopy; chemical vapor deposition; copper; graphene; nanoparticles