New Insights into SERS Mechanism of Semiconductor-Metal Heterostructure: A Case Study on Vanadium Pentoxide Nanoparticles Decorated with Gold

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10490065" target="_blank" >RIV/00216208:11320/24:10490065 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=1Ap0e9rh0n" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=1Ap0e9rh0n</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.4c03080" target="_blank" >10.1021/acs.jpcc.4c03080</a>

Result language

angličtina

Original language name

New Insights into SERS Mechanism of Semiconductor-Metal Heterostructure: A Case Study on Vanadium Pentoxide Nanoparticles Decorated with Gold

Original language description

Recently, vanadium oxides and other semiconductor materials have been intensively studied to use them as nonplasmonic substrates for surface-enhanced Raman scattering (SERS) spectroscopy due to their advantages such as greater uniformity, stability, and spectral reproducibility compared to plasmonic ones. The combination of vanadium pentoxide nanoparticles (V(2)O(5) NPs) with nanostructures of noble metals has shown considerable promise for enhancing the SERS signal, while maintaining the aforementioned advantages. We prepared V(2)O(5)/Au NP films by a novel, simple, fully solvent- and linker-free method: the gas-phase synthesis of vanadium NPs followed by their thermal annealing at 550 degrees C to obtain V(2)O(5) NP films, which were subsequently decorated with Au nanoislands. Using methylene blue (MB) solution as a test analyte, we observed a significant enhancement of the SERS signal (up to 65 times) from the V(2)O(5)/Au composite compared to those from pure V(2)O(5) substrates. The SERS enhancement in this case arises from the synergy of electromagnetic and chemical (charge-transfer) enhancement. The deposition of Au on the V(2)O(5) surface increases the charge-transfer contribution. Moreover, the additional enhancement is achieved due to electromagnetic field coupling between V(2)O(5) and Au or between neighboring Au nanostructures. The observation of two maxima of MB SERS signal from the V(2)O(5)/Au heterostructure for various Au deposition times brings new insights into the SERS mechanism of the semiconductor-metal heterostructure. Spectral mapping across the V(2)O(5)/Au substrates shows excellent homogeneity and spectral reproducibility (RSD of the SERS signal less than 10%). This study introduces an important step in designing novel semiconductor-metal SERS-active substrates. Our V(2)O(5)/Au heterostructures represent highly attractive substrates with improved stability and spectral reproducibility as compared to other nonplasmonic and plasmonic ones.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project

<a href="/en/project/GA22-16667S" target="_blank" >GA22-16667S: Synthesis of metal oxide-based nanomaterials for surface-enhanced Raman spectroscopy by plasma-based gas aggregation sources</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

1932-7455

Volume of the periodical

128

Issue of the periodical within the volume

28

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

11732-11740

UT code for WoS article

001265547500001

EID of the result in the Scopus database

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