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Au Nanoparticles@Si Nanowire Oligomer Arrays for SERS: Dimers Are Best.

ABSTRACT: We report the synthesis of vertically aligned silicon nanowire (VA-SiNW) oligomer arrays coated with Au nanoparticle (NP) monolayers via a combination of colloidal lithography, metal-assisted chemical etching, and directed NP assembly. Arrays of SiNW monomers (i.e., isolated NWs), dimers, and tetramers are synthesized, decorated with AuNPs, and tested for their performance in surface-enhanced Raman spectroscopy. The ∼20 nm AuNPs easily enter within the ca. 40 nm gaps of the SiNW oligomers, thus reaching the hot spot region. At 785 nm excitation, the AuNPs@SiNW dimer arrays provide the highest Raman signal, in agreement with electromagnetic simulations showing a high electric field enhancement at the Au/Si interface within the dimer gap region.

SUBMITTER: Bartschmid T

PROVIDER: S-EPMC11310913 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature

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Au Nanoparticles@Si Nanowire Oligomer Arrays for SERS: Dimers Are Best.

Bartschmid Theresa T Menath Johannes J Roemling Lukas L Vogel Nicolas N Atalay Furkan F Farhadi Amin A Bourret Gilles R GR

ACS applied materials & interfaces 20240726 31

We report the synthesis of vertically aligned silicon nanowire (VA-SiNW) oligomer arrays coated with Au nanoparticle (NP) monolayers via a combination of colloidal lithography, metal-assisted chemical etching, and directed NP assembly. Arrays of SiNW monomers (i.e., isolated NWs), dimers, and tetramers are synthesized, decorated with AuNPs, and tested for their performance in surface-enhanced Raman spectroscopy. The ∼20 nm AuNPs easily enter within the ca. 40 nm gaps of the SiNW oligomers, thus ...[more]

PMID: 39057191

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