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Your search keyword '"Li, Zhi-Yuan"' showing total 17 results
Start Over Author "Li, Zhi-Yuan" Journal nano letters
17 results on '"Li, Zhi-Yuan"'

16. Metal nanoparticles with gain toward single-molecule detection by surface-enhanced Raman scattering.

Author

Li ZY and Xia Y

Subjects
Absorption, Biosensing Techniques methods, Gold chemistry, Humans, Light, Materials Testing, Nanotechnology instrumentation, Neoplasms diagnosis, Quantum Dots, Scattering, Radiation, Spectroscopy, Near-Infrared methods, Surface Plasmon Resonance methods, Surface Properties, Metal Nanoparticles chemistry, Nanotechnology methods, Spectrum Analysis, Raman methods, Surface Plasmon Resonance instrumentation
Abstract

Single-molecule detection via surface-enhanced Raman scattering (SERS) has raised great interest over the past decade. The usual approach toward this goal is to harness the strong surface plasmon resonance of light with complex metallic nanostructures, such as particle aggregates, two-particle gaps, sharp tips, or particles with sharp apexes. Here we propose another route toward the goal by introducing gain medium into single metal nanoparticles with simple geometry. Our calculations show that cubic gold nanobox particles that contain a gain material within the core can create an extremely high enhancement factor of local field intensity larger than 10(8) and a SERS enhancement factor on the order of 10(16)-10(17).

Published
2010
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17. Optical properties of Pd-Ag and Pt-Ag nanoboxes synthesized via galvanic replacement reactions.

Author

Chen J, Wiley B, McLellan J, Xiong Y, Li ZY, and Xia Y

Abstract

Silver nanocubes dispersed in water were transformed into Pd-Ag or Pt-Ag nanoboxes by adding either Na(2)PdCl(4) or Na(2)PtCl(4). By controlling the amount of noble metal salt added, and therefore the molar ratio of Na(2)PdCl(4) or Na(2)PtCl(4) to Ag, we could tune the surface plasmon resonance peak of the nanostructures across the entire visible spectrum, from 440 to 730 nm. Replacement of Ag with Pd resulted in the formation of a nanobox composed of a Pd-Ag alloy single crystal, but the nanobox formed after replacement of Ag with Pt was instead composed of distinct Pt nanoparticles. DDA calculations suggest that both nanoboxes absorb light strongly, with Q(abs)/Q(sca) approximately 5. After galvanic replacement, Pd-Ag and Pt-Ag nanostructures remain SERS active, suggesting their use as a SERS probe for studying the dependence of interfacial chemistry on composition.

Published
2005
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