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Silver nanoaggregates on chitosan functionalized graphene oxide for high-performance surface-enhanced Raman
Mingming Wan1, Zhiming Liu, Shaoxin Li
1MOE Key Laboratory of Laser Life Science and SATCM Third Grade Laboratory of Chinese Medicine and Photonics Technology, College of Biophotonics, South China Normal University, Guangzhou 510631, People's Republic of China.
This study introduces graphene oxide/Ag nanoparticles nano-composites (GO/CS/AgNPs) for enhanced surface-enhanced Raman scattering (SERS) detection. These materials show high sensitivity for aromatic molecules and potential in biomedical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Analytical Chemistry
Background:
- Graphene oxide (GO) and silver nanoparticles (AgNPs) are key nanomaterials.
- Chitosan (CS) functionalization enhances material properties.
- Surface-enhanced Raman scattering (SERS) is a sensitive detection technique.
Purpose of the Study:
- To develop a novel graphene oxide/Ag nanoparticles nano-composite (GO/CS/AgNPs).
- To investigate the SERS activity of the synthesized nano-composite for aromatic molecules.
- To explore the potential of GO/CS/AgNPs in biomedical applications.
Main Methods:
- Self-assembly synthesis of GO/CS/AgNPs via non-covalent attachment.
- Utilizing electrostatic interactions for AgNP aggregation on GO/CS.
- Employing SERS to detect aromatic molecules like trypan blue and methylene blue.
- Comparing SERS enhancement with and without GO/CS functionalization.
Main Results:
- GO/CS/AgNPs demonstrated strong SERS activity for aromatic molecules.
- Higher SERS signals were observed for negatively charged trypan blue compared to positively charged methylene blue.
- The nano-composite significantly enhanced the SERS signals of l-phenylalanine.
- AgNP aggregation on GO/CS via electrostatic interaction is beneficial for SERS detection.
Conclusions:
- The developed GO/CS/AgNPs exhibit excellent SERS performance.
- The material shows promise for sensitive detection of various molecules, including those relevant to biomedical fields.
- Electrostatic interactions play a crucial role in the enhanced SERS activity and molecular enrichment.
