Nanohybrids of Gold Nanoparticles/Graphene for Surface-Enhanced Raman Spectroscopy Detection

• Main Authors: Wei-wu Hsu, 徐威武
• Other Authors: Ming-chien Yang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/38203216525316815235

碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 102 === In this research, graphene nanosheets was functionalized with cationic poly(diallyldimethyl ammonium chloride) (PDDA). Simultaneously, the citrate-capped gold nanoparticles (AuNPs) were synthesized through the traditional citrate thermal reduction method. Then the resulting AuNPs were adsorbed to Graphene-PDDA through electrostatic interaction. These nanohybrids of Au/Graphene-PDDA exhibited good dispersion and optical transparency, which increased the surface-area between the substrate and microorganisms, thus enhancing surface-enhanced Raman scattering (SERS) sensitivity. Au/Graphene-PDDA substrate can be widely used in SERS detection of small molecules (adenine) and microorganisms (S. aureus). Finally, the morphology and particle spacing of Au/Graphene-PDDA can be controlled by varying the ratio of the proportion between AuNPs and graphene-PDDA, thereby optimizing the SERS enhancement effect. Thus these nanohybrids can be used for biosensing.