Spike Growth on Patterned Gold Nanoparticle Scaffolds

This work reports a scaffold-templated, bottom-up synthesis of 3D anisotropic nanofeatures on periodic arrays of gold nanoparticles (AuNPs). Our method relies on substrate-bound AuNPs as large seeds with hemispherical shapes and smooth surfaces after the thermal annealing of as-fabricated particles....

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Bibliographic Details
Published inNano letters Vol. 23; no. 23; pp. 11260 - 11265
Main Authors Jia, Jin, Metzkow, Nadia, Park, Sang-Min, Wu, Yuhao Leo, Sample, Alexander D., Diloknawarit, Bundit, Jung, Insub, Odom, Teri W.
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 13.12.2023
Subjects
nanoparticle growth
spiky gold nanoparticle array
seed-mediated growth
nanofabrication
surface-enhanced Raman spectroscopy
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Summary:This work reports a scaffold-templated, bottom-up synthesis of 3D anisotropic nanofeatures on periodic arrays of gold nanoparticles (AuNPs). Our method relies on substrate-bound AuNPs as large seeds with hemispherical shapes and smooth surfaces after the thermal annealing of as-fabricated particles. Spiky features were grown by immersing the patterned AuNPs into a growth solution consisting of a gold salt and Good’s buffer; the number and length of spikes could be tuned by changing the solution pH and buffer concentration. Intermediate structures that informed the growth mechanism were characterized as a function of time by correlating the optical properties and spike features. Large-area (cm2) spiky AuNP arrays exhibited surface-enhanced Raman spectroscopy enhancement that was associated with increased numbers of high-aspect-ratio spikes formed on the AuNP seeds.
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content type line 23
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.3c03778