Journal
CHEMICAL PHYSICS LETTERS
Volume 715, Issue -, Pages 91-99Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2018.11.024
Keywords
Au NPs; Interface; Self-assembly; Interparticle distance; Localized Surface Plasmon
Funding
- National Research Foundation of Korea (NRF) - Korea government [NRF-2015R1D1A1A01060222, NRF-2018R1A2B6007742]
- Korea Basic Science Institute (KBSI) [G38120]
- Korea Research Institute of Standards and Science (KRISS) [16011046]
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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.
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