Tuning the interparticle distances in self-assembled gold nanoparticle films with their plasmonic responses
- Authors
- Kim, I.-H.; Kim, J.H.; Choi, J.-Y.; Shin, C.H.; Kim, J.-H.; Bae, G.-T.; Shin, K.S.
- Issue Date
- Jan-2019
- Publisher
- Elsevier B.V.
- Keywords
- Au NPs; Interface; Interparticle distance; Localized Surface Plasmon; Self-assembly
- Citation
- Chemical Physics Letters, v.715, pp.91 - 99
- Journal Title
- Chemical Physics Letters
- Volume
- 715
- Start Page
- 91
- End Page
- 99
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/30843
- DOI
- 10.1016/j.cplett.2018.11.024
- ISSN
- 0009-2614
- Abstract
- This study presents the fabrication and characterization of imine-functionalized Au nanoparticle (Au NP) film using Poly (ethyleneimine) (PEI) as a reducing and surface stabilizing reagent. The PEI-capped Au NPs can be self-assembled at the water-hexane interface by adding alcohol containing alkanethiol. Furthermore, large-area film made from PEI and alkanethiol-capped Au NPs is produced on a glass substrate with varying interparticle distances that can be controlled by the alkyl chain lengths, ranging from C2 (ethanethiol), C4 (1-butnaethiol), C6 (1-hexanethiol), C8 (1-octanethiol), to C10 (1-decanethiol) at the water-hexane interface. These 2D films show strong collective localized surface plasmon resonance (LSPR) extinction bands that are tunable via near-field coupling of adjacent Au NPs. Pronounced chain-length-dependent red shifts of the SPR bands have been observed for the PEI-capped Au films. The obtained PEI-capped Au films exhibit distinct interparticle-distance-dependent SERS characteristics. ? 2018 Elsevier B.V.
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Collections - College of Natural Sciences > Department of Chemistry > 1. Journal Articles
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