Accession Number:

ADP012244

Title:

Magic Family of Discretely Sized Ultrabright Si Nanoparticles

Descriptive Note:

Corporate Author:

ILLINOIS UNIV AT URBANA

Report Date:

2001-11-01

Pagination or Media Count:

6.0

Abstract:

We describe a procedure for dispersion bulk Si into a family discretely sized ultrasmall ultrabright nanoparticles. We demonstrate that electrochemically etched, hydrogen capped SinHx, clusters with n larger than 20 are obtained within a family of discrete sizes. These sizes are 1.0 Si29, 1.67 Si123, 2.15, 2.9, and 3.7 nm diameter. We characterize the particles via direct electron imaging, excitation and emission optical spectroscopy, chromatography, and colloidal crystallization. The band gaps and emission bands are measured. The smallest four are ultrabright blue, green, yellow, and red luminescent particles. The availability of discrete sizes and distinct emission in the red, green and blue range is useful for biomedical tagging, RUB displays, and flash memories.

Subject Categories:

  • Physical Chemistry
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE