Facet- and Gas-Dependent Reshaping of Au Nanoplates by Plasma Treatment
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AbstractThe reshaping of metal nanocrystals on substrates is usually realized by pulsed laser irradiation or ion-beam milling with complex procedures. In this work, we demonstrate a simple method for reshaping immobilized Au nanoplates through plasma treatment. Au nanoplates can be reshaped gradually with nearly periodic right pyramid arrays formed on the surface of the nanoplates. The gaseous environment in the plasma-treatment system plays a significant role in the reshaping process with only nitrogen-containing environments leading to reshaping. The reshaping phenomenon is facet-dependent, with right pyramids formed only on the exposed {111} facets of the Au nanoplates. The morphological change of the Au nanoplates induced by the plasma treatment leads to large plasmon peak redshifts. The reshaped Au nanoplates possess slightly higher refractive index sensitivities and largely increased surface-enhanced Raman scattering intensities compared to the flat, untreated nanoplates. Our results offer insights for studying the interaction mechanism between plasma and the different facets of noble metal nanocrystals and an approach for reshaping light-interacting noble metal nanocrystals.
All Author(s) ListAi RQ, Boukouvala C, Lewis G, Wang H, Zhang H, Lai YH, Huang H, Ringe E, Shao L, Wang JF
Journal nameACS Nano
Volume Number15
Issue Number6
Pages9860 - 9870
LanguagesEnglish-United Kingdom
Keywordsgold nanocrystals, gold nanoplates, plasma treatment, plasmon resonance, reshaping surface-enhanced Raman scattering
Web of Science Subject CategoriesChemistry, Multidisciplinary;Chemistry, Physical;Nanoscience & Nanotechnology;Materials Science, Multidisciplinary;Chemistry;Science & Technology - Other Topics;Materials Science

Last updated on 2022-14-01 at 00:21