TY - JOUR
T1 - Low-Variance Surface-Enhanced Raman Spectroscopy Using Confined Gold Nanoparticles over Silicon Nanocones
AU - Jonker, Dirk
AU - Srivastava, Ketki
AU - Lafuente, Marta
AU - Susarrey-Arce, Arturo
AU - van der Stam, Ward
AU - van den Berg, Albert
AU - Odijk, Mathieu
AU - Gardeniers, Han J.G.E.
N1 - Funding Information:
D.J. and K.S. would like to acknowledge the help of B.T.H. Borgelink and M. Dikkers with the DR GLAD deposition, M. Goodwin for fabricating the FIB cross section and collection of SEM–EDX data, and J. Bomer for assisting with the annealing processes. All authors acknowledge the financial support by the Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation programme. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 801359.
Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.
PY - 2023/6/9
Y1 - 2023/6/9
N2 - Surface-enhanced Raman spectroscopy (SERS) substrates are of utmost interest in the analyte detection of biological and chemical diagnostics. This is primarily due to the ability of SERS to sensitively measure analytes present in localized hot spots of the SERS nanostructures. In this work, we present the formation of 67 ± 6 nm diameter gold nanoparticles supported by vertically aligned shell-insulated silicon nanocones for ultralow variance SERS. The nanoparticles are obtained through discrete rotation glancing angle deposition of gold in an e-beam evaporating system. The morphology is assessed through focused ion beam tomography, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. The optical properties are discussed and evaluated through reflectance measurements and finite-difference time-domain simulations. Lastly, the SERS activity is measured by benzenethiol functionalization and subsequent Raman spectroscopy in the surface scanning mode. We report a homogeneous analytical enhancement factor of 2.2 ± 0.1 × 107 (99% confidence interval for N = 400 grid spots) and made a comparison to other lithographically derived assemblies used in SERS. The strikingly low variance (4%) of our substrates facilitates its use for many potential SERS applications.
AB - Surface-enhanced Raman spectroscopy (SERS) substrates are of utmost interest in the analyte detection of biological and chemical diagnostics. This is primarily due to the ability of SERS to sensitively measure analytes present in localized hot spots of the SERS nanostructures. In this work, we present the formation of 67 ± 6 nm diameter gold nanoparticles supported by vertically aligned shell-insulated silicon nanocones for ultralow variance SERS. The nanoparticles are obtained through discrete rotation glancing angle deposition of gold in an e-beam evaporating system. The morphology is assessed through focused ion beam tomography, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. The optical properties are discussed and evaluated through reflectance measurements and finite-difference time-domain simulations. Lastly, the SERS activity is measured by benzenethiol functionalization and subsequent Raman spectroscopy in the surface scanning mode. We report a homogeneous analytical enhancement factor of 2.2 ± 0.1 × 107 (99% confidence interval for N = 400 grid spots) and made a comparison to other lithographically derived assemblies used in SERS. The strikingly low variance (4%) of our substrates facilitates its use for many potential SERS applications.
KW - gold nanoparticles
KW - homogeneity
KW - plasmonics
KW - silicon nanocones
KW - surface-enhanced Raman spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85162927251&partnerID=8YFLogxK
U2 - 10.1021/acsanm.3c01249
DO - 10.1021/acsanm.3c01249
M3 - Article
AN - SCOPUS:85162927251
SN - 2574-0970
VL - 6
SP - 9657
EP - 9669
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
IS - 11
ER -