期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 2, 页码 453-459出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp109586f
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资金
- National Science Foundation [DMR-0619310]
- United States Department of Agriculture [2009-34479-19833]
- University of Idaho Biological Applications of Nanotechnology (BANTech) Center
- NIFA [2009-34479-19833, 582147] Funding Source: Federal RePORTER
Silica nanosprings with large surface-to-volume ratios were coated with noble metal nanoparticles (NPs) using chemical vapor deposition or chemisorption of presynthesized or in situ synthesized nanoparticles. Chemisorption of presynthesized silver NPs onto amine-functionalized silica NS results in particularly interesting materials with small interparticle spacings and high surface-enhanced Raman scattering activity. SERS enhancement factors approaching similar to 10(10) were observed with thiophenol. In an alternative approach, silica NS coated with core-shell nanostructures, formed by deposition of catalytically reduced silver on AuNP-coated NS, exhibit a highly uniform SERS response with enhancement factors of similar to 10(8). The advantages of these materials include (i) commercial availability of silica nanosprings, AuNPs/AgNPs, and silver enhancer solutions, (ii) simplicity and reproducibility of functionalization and deposition steps, and (iii) high SERS activity of these substrates rendering them of considerable interest for a variety of sensor applications.
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