Journal
SMALL
Volume 13, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201701715
Keywords
Ag nanoplate; multistep growth; near infrared; plasmon resonance
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Funding
- Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) Junior Faculty Award
- ICTAS Diversity and Inclusion Seed Grant
- Department of Chemistry startup package
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Herein, a poly(vinylpyrrolidone) (PVP)-free method is described for synthesizing Ag nanoplates that have localized surface plasmon resonance in the near-infrared (NIR) range. Citrate-capped Ag spherical nanoparticles are first grown into small Ag nanoplates that resonate in the range of 500-800 nm. The small Ag nanoplates are used as seeds to further grow into large Ag nanoplates with a lateral dimension of 100-600 nm and a plasmon resonance wavelength of 800-1660 nm and above. The number of growth steps can be increased as desired. Without introducing additional citrate into the solutions of small Ag nanoplate seeds, large Ag nanoplates can be synthesized within minutes. The entire synthesis is completely PVP free, which promotes the nanoparticle growth along the lateral direction to form large Ag nanoplates. The multistep growth and the minimum usage of citrate are essential for the fast growth of high-aspect-ratio Ag nanoplates resonating in the NIR range.
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