Diamine-linked array of metal (Au, Ag) nanoparticles on glass substrates for reliable surface-enhanced Raman scattering (SERS) measurements
- Authors
- Bu, Yanru; Park, Sang Joon; Lee, Sang-Wha
- Issue Date
- May-2014
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Au; Ag; Diamines; Chain length; SERS
- Citation
- CURRENT APPLIED PHYSICS, v.14, no.5, pp.784 - 789
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 14
- Number
- 5
- Start Page
- 784
- End Page
- 789
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/12672
- DOI
- 10.1016/j.cap.2014.03.008
- ISSN
- 1567-1739
- Abstract
- Metal (Au, Ag) nanoparticles (M NPs) (ca. 30-40 nm) prepared by citrate reduction method were arrayed on amine-terminated glass substrates using diamine linkers with different chain lengths. 1,4-diaminobutane (C-4 diamine) produced the uniform and densely-packed array of M NPs on glass substrates at appropriate concentration ranges, whereas diamine linkers with longer chain lengths (C-8 and C-12 diamines) produced more heterogeneous and aggregated array of M NPs. When compared to Ag NPs, Au NPs demonstrated more controllable and higher packing density due to their mono-dispersed size and higher affinity to diamine linkers. Uniformly arrayed M NPs (Au, Ag) on glass substrates exhibited high enhancement factors in SERS measurements of o-chlorothiophenol probes. Au NPs arrayed substrates exhibited an approximate power-law linearity of Raman intensity with probe concentrations (from 10(-7) M to 10(-4) M), demonstrating more reliable SERS substrates than Ag arrayed substrates with higher SERS activity. (C) 2014 Elsevier B.V. All rights reserved.
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