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Charge-Selective Surface-Enhanced Raman Scattering Using Silver and Gold Nanoparticles Deposited on Silicon-Carbon Core-Shell Nanowires

Authors
Baik, Sun YoungCho, Yong JaeLim, Young RokIm, Hyung SoonJang, Dong MyungMyung, YoonPark, JeungheeKang, Hong Seok
Issue Date
Mar-2012
Publisher
AMER CHEMICAL SOC
Keywords
surface-enhanced Raman scattering; charge selectivity; N-doped graphitic layers; silicon nanowires; silver nanoparticles; first principles calculations; electron transfer
Citation
ACS NANO, v.6, no.3, pp.2459 - 2470
Indexed
SCIE
SCOPUS
Journal Title
ACS NANO
Volume
6
Number
3
Start Page
2459
End Page
2470
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/105348
DOI
10.1021/nn204797b
ISSN
1936-0851
Abstract
The deposition of silver (Ag) or gold (Au) nanoparticles (NPs) on vertically aligned silicon-carbon (Si-C) core-shell nanowires (NWs) produces sensitive substrates for surface-enhanced Raman spectroscopy (SERS). The undoped and 30% nitrogen (N)-doped graphitic layers of the C shell (avg thickness of 20 nm) induce a higher sensitivity toward negatively (-) and positively (+) charged dye molecules, respectively, showing remarkable charge selectivity. The Ag NPs exhibit higher charge selectivity than the Au NPs, The Ag NPs deposited on p- and n-type Si NWs also exhibit (-) and (+) charge selectivity, respectively, which is higher than that of the Au NPs. The X-ray photoelectron spectroscopy analysis indicates that the N-doped graphitic layers donate more electrons to the metal NPs than the undoped ones. More distinct electron transfer occurs to the Ag NPs than to the Au NPs. First principles calculations of the graphene-metal adducts suggest that the large electron transfer capacity of the N-doped graphitic layers is due to the formation of a N -> Ag coordinate bond involving the lone pair electrons of the N atoms. We propose that the more (-) charged NPs on the N-doped graphitic layers prefer the adsorption of (+) charged dyes, enhancing the SERS intensity. The charge selectivity of the Si NW substrates can also be rationalized by the greater electron transfer from the n-type Si to the metal NPs.
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