Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 6, Pages 3278-3284Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am300634n
Keywords
reduced graphene oxide; beta-lactoglobulin; composite; pH-sensitive solubility; Au nanoparticles; SERS
Funding
- National Natural Science Foundation of China [50972080, 91127017]
- National Basic Research Program [2009CB930101]
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A globular protein, beta-lactoglobulin (BLG), was used to decorate reduced graphene oxide sheets (RGO) and the obtained BLG-RGO composite can be dispersed in aqueous solution with pH-sensitive solubility. The morphology of the BLG-RGO composite was studied by transmission electron microscopy (TEM) and atomic force microscopy (AFM). The results indicate that BLG-RGO is effectively exfoliated with an average thickness of 2.5 nm. UV-vis spectra were performed to examine the reduction degree and determine the optimum concentration of beta-lactoglobulin and appropriate pH value. Furthermore, Raman spectra demonstrate that beta-Lactoglobulin promotes the chemical reduction process of graphene oxide and benefits to repair the crystal defects. Due to the adsorption of beta-Lactoglobulin on the surface of graphene sheets, the BLG-RGO composite was further used as template for Au nanoparticles assembly. These Au nanoparticles assembled on the BLG-RGO composite were shown to yield a large SERS enhancement for Rhodamine 6G.
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