Optical Properties of Dopamine Molecules with Silver Nanoparticles as Surface-Enhanced Raman Scattering (SERS) Substrates at Different pH Conditions
- Authors
- Bu, Yanru; Lee, Sang-Wha
- Issue Date
- Sep-2013
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- pH; Ag Nanoparticles; Dopamine; SERS; Cross-Linking
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.13, no.9, pp.5992 - 5996
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 13
- Number
- 9
- Start Page
- 5992
- End Page
- 5996
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/14315
- DOI
- 10.1166/jnn.2013.7644
- ISSN
- 1533-4880
- Abstract
- Silver nanoparticles (Ag NPs) prepared by the citrate reduction method were examined as surface-enhanced Raman scattering (SERS) substrates in the detection of dopamine (DA) molecules at different hydrogen ion concentrations. The aggregation of Ag NPs was influenced by the cross-linking effect of DA molecules as the function of pH of colloidal solution. Somewhat clustering of Ag NPs in a limited pH range (pH 7-9) exhibited the strong red-shift of absorption peak and maximal SERS activity to DA molecules, highlighting the importance of strong electrostatic adsorption and cross-linking effect that allowed DA molecules to reside in the junctions (hot spots) between aggregated Ag NPs. Furthermore, Ag NPs with DA molecules at strongly basic condition (>pH 9) exhibited the relatively high SERS activity as compared to negligible SERS activity at acidic condition (<= pH 5), indicating the important role of oxidized surface of silver NPs which can interact with hydroxyl groups of DA molecules.
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