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Abstract
Nanosized surface-enhanced Raman scattering (SERS) substrates fabricated by the controlled growth of metal nanostructures on water-dispersed two-dimensional nanomaterials can open a new avenue for SERS analysis of liquid samples in biological fields. In this work, regular and uniform Ag nanostructures were grown on the surface of graphene oxide (GO) through a microwave-assisted hydrothermal method. Polyamidoamine (PAMAM) dendrimers were assembled on the surface of GO to form GO/PAMAM templates for growing Ag nanostructures, which are primarily comprised of Ag dimers and trimers. The prepared Ag/GO nanocomposites are highly dispersed and stable in aqueous solution and may be used as substrates for enhanced Raman detection of rhodamine 6 G (R6G) in aqueous solution. This special substrate provides high-performance SERS and suppresses R6G fluorescence in aqueous solution and is promising as a nanosized material for the enhanced Raman detection of liquid samples in biological diagnostics.
Acknowledgments
This work was financially supported by the National Key Research and Development Program of China (2017YFA0205302), the National Natural Science Foundation of China (21475064, 61705113), the Program for Changjiang Scholars and Innovative Research Team in University (IRT_15R37), the Key Research and Development Program of Jiangsu (BE2018732), the Natural Science Key Fund for Colleges and Universities in Jiangsu Province (17KJA430011), and the University Science Research Project of Jiangsu Province (NY217007, NY218150).