TY - JOUR
T1 - Probing localized surface plasmons of trisoctahedral gold nanocrystals for surface enhanced raman scattering
AU - Maity, Achyut
AU - Maiti, Arpan
AU - Satpati, Biswarup
AU - Patsha, Avinash
AU - Dhara, Sandip
AU - Chini, Tapas Kumar
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/12
Y1 - 2016/12
N2 - Trisoctahedral (TOH) shaped gold (Au) nano-crystals (NCs) have emerged as a new class of metal nanoparticles (MNPs) due to their superior catalytic and surface enhanced Raman scattering (SERS) activities caused by the presence of high density of atomic steps and dangling bonds on their high-index facets. We examine the radiative localized surface plasmon resonance (LSPR) modes of an isolated single TOH Au NC using cathodoluminescence (CL), with high resolution spatial information on the local density of optical states (LDOS) across the visible spectral range. Further, we show pronounced enhancement in the Raman scattering by performing Raman spectroscopic measurements on Rhodamine 6G (R6G)-covered TOH Au NPs aggregates on a Si substrate. We believe that the hot spots between two adjacent MNP surfaces ("nanogaps") can be significantly stronger than single particle LSPRs. Such "nanogaps" hot spots may have crucial role on the substantial SERS enhancement observed in this report. Consequently, the present study indicates that MNPs aggregates are highly desirable than individual plasmonic nanoparticles for possible applications in SERS based biosensing.
AB - Trisoctahedral (TOH) shaped gold (Au) nano-crystals (NCs) have emerged as a new class of metal nanoparticles (MNPs) due to their superior catalytic and surface enhanced Raman scattering (SERS) activities caused by the presence of high density of atomic steps and dangling bonds on their high-index facets. We examine the radiative localized surface plasmon resonance (LSPR) modes of an isolated single TOH Au NC using cathodoluminescence (CL), with high resolution spatial information on the local density of optical states (LDOS) across the visible spectral range. Further, we show pronounced enhancement in the Raman scattering by performing Raman spectroscopic measurements on Rhodamine 6G (R6G)-covered TOH Au NPs aggregates on a Si substrate. We believe that the hot spots between two adjacent MNP surfaces ("nanogaps") can be significantly stronger than single particle LSPRs. Such "nanogaps" hot spots may have crucial role on the substantial SERS enhancement observed in this report. Consequently, the present study indicates that MNPs aggregates are highly desirable than individual plasmonic nanoparticles for possible applications in SERS based biosensing.
UR - http://www.scopus.com/inward/record.url?scp=85016471984&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.6b09296
DO - 10.1021/acs.jpcc.6b09296
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AN - SCOPUS:85016471984
SN - 1932-7447
VL - 120
SP - 27003
EP - 27012
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 47
ER -