Morphological control and plasmonic tuning of nanoporous gold disks by surface modifications

Jianbo Zeng, Fusheng Zhao, Ming Li, Chien-Hung Li, T. Randall Lee, Wei-Chuan Shih

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

We report a surface modification protocol to control nanoporous gold (NPG) disk morphology and tune its plasmonic resonance. Enlarged pore size up to ∼20 nm within 60 s dealloying time has been achieved by adsorbing halides onto alloy surfaces in-between two dealloying steps. In addition, plasmonic resonance has been significantly red-shifted by up to ∼258 nm by the surface modification. Furthermore, with the enlarged pore size, small gold nanoparticles have been effectively loaded into the pores to enhance the performance of surface-enhanced Raman scattering (SERS) due to hot spot formation between the original nanoporous network and loaded nanoparticles.
Original languageEnglish
Pages (from-to)247-252
Number of pages6
JournalJournal of Materials Chemistry C
Volume3
Issue number2
DOIs
Publication statusPublished - 14 Jan 2015
Externally publishedYes

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