Demonstration of Surface-Enhanced Raman Scattering by Tunable, Plasmonic Gallium Nanoparticles

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• 作者：Pae C Wu ; Christopher G. Khoury ; Tong-Ho Kim ; Yang Yang ; Maria Losurdo ; Giuseppe V. Bianco ; Tuan Vo-Dinh ; April S. Brown ; Henry O. Everitt
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：September 2, 2009
• 年：2009
• 卷：131
• 期：34
• 页码：12032-12033
• 全文大小：140K
• 年卷期：v.131,no.34(September 2, 2009)
• ISSN：1520-5126

文摘

Size-controlled gallium nanoparticles deposited on sapphire were explored as alternative substrates to enhance Raman spectral signatures. Gallium’s resilience following oxidation is inherently advantageous in comparison with silver for practical ex vacuo nonsolution applications. Ga nanoparticles were grown using a simple molecular beam epitaxy-based fabrication protocol, and monitoring their corresponding surface plasmon resonance energy through in situ spectroscopic ellipsometry allowed the nanoparticles to be easily controlled for size. The Raman spectra obtained from cresyl fast violet (CFV) deposited on substrates with differing mean nanoparticle sizes represent the first demonstration of enhanced Raman signals from reproducibly tunable self-assembled Ga nanoparticles. Nonoptimized aggregate enhancement factors of 80 were observed from the substrate with the smallest Ga nanoparticles for CFV dye solutions down to a dilution of 10 ppm.