Abstract

Herein we describe a self-assembly synthesis of graphene oxide/Ag nanoparticles nano-composites (GO/CS/AgNPs) by non-covalent attachment of AgNPs to chitosan (CS) functionalized graphene oxide (GO) sheets. The negatively charged AgNPs are prone to form aggregates on GO/CS via electrostatic interaction, which is extremely beneficial to the surface-enhanced Raman scattering (SERS) detection of aromatic molecules. Taking advantage of the enrichment of target molecules on GO, the obtained hybrids exhibit strong SERS activity to aromatic molecules (trypan blue and methylene blue). Furthermore, SERS signals of a negatively charged molecule (trypan blue) are stronger than signals of a positively charged molecule (methylene blue) due to the different adsorption capacity of GO/CS/AgNPs for the two opposite charged molecules through electrostatic interaction. Moreover, GO/CS/AgNPs remarkably enhance the main peaks of l-phenylalanine, in comparison with the silver nanoparticles, showing great potential for biomedical applications.

High-performance 3D flexible SERS substrate based on graphene oxide/silver nanoparticles/pyramid PMMA

Xianwu Xiu, Yu Guo, Chonghui Li, Zhen Li, Dazhen Li, Chuanwei Zang, Shouzhen Jiang, Aihua Liu, Baoyuan Man, and Chao Zhang
Opt. Mater. Express 8(4) 844-857 (2018)

High-performance surface-enhanced Raman scattering substrate prepared by self-assembling of silver nanoparticles into the nanogaps of silver nanoislands

Jiamin Quan, Yong Zhu, Jie Zhang, Junyin Li, and Ning Wang
Appl. Opt. 56(20) 5751-5760 (2017)

Graphene oxide/Ag nanoparticle/WS₂ nanosheet heterostructures for surface-enhanced Raman spectroscopy

Luyao Wang, Mingjin Liu, Biao Chen, Jie Pan, Shuyun Wang, Chao Zhang, Zhen Li, Qianqian Peng, and Xianwu Xiu
Opt. Mater. Express 12(9) 3718-3730 (2022)

Plasmonic coupling of silver nanoparticles covered by hydrogen-terminated graphene for surface-enhanced Raman spectroscopy

Chih-Yi Liu, Keng-Chih Liang, Waileong Chen, Chia-hao Tu, Chuan-Pu Liu, and Yonhua Tzeng
Opt. Express 19(18) 17092-17098 (2011)

ZnO/graphene/Ag composite as recyclable surface-enhanced Raman scattering substrates

Jie Zhang, Xiaolei Zhang, Yimin Ding, and Yong Zhu
Appl. Opt. 55(32) 9105-9112 (2016)