Beth A Manhat

Portland State University | PSU · Department of Chemistry

Visibly emissive silicon nanoparticles (Si NPs) were obtained via annealing of (HSiO1.5)n polymer, followed by chemical etching. The hydride-terminated Si NPs (H-Si NPs) were surface-functionalized via thermal hydrosilylation with 1-decene and were dispersed in straight chain alcohols varying in carbon chain length (C1-C10). The initial red photolu...

Stable, aqueous, red-to-near infrared emission is critical for the use of silicon nanoparticles (Si NPs) in biological fluorescence assays, but such Si NPs have been difficult to attain. We report a synthesis and surface modification strategy that protects Si NPs and preserves red photo-luminescence (PL) in water for more than 6 mo. The Si NPs were...

To improve the performance of graphene and to extend its potential applications, one of the most effective efforts is to hybridize graphene with one or more metal/metal oxide nanocrystals (NCs). In this paper, we demonstrate the complementary techniques of X-ray diffraction, high resolution electron microscopy (HREM), energy-dispersive X-ray spectr...

We have developed a versatile, one-step melt synthesis of water-soluble, highly emissive silicon nanoparticles using bi-functional, low-melting solids (such as glutaric acid) as reaction media. Characterization through transmission electron microscopy, selected area electron diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy show...

Solid-state reaction in particle compacts comprising organically capped nanoscale Ag particles and Sn was evaluated. The results indicate that all of the Sn initially present formed a liquid phase when combined with sodium dodecyl sulfate (SDS)-capped particles, while smaller fractions were obtained when combined with polyvinylpyrrolidone- and poly...

Differential scanning calorimetry (DSC) was used to evaluate the extent of liquid phase formation in particle compacts (compressed dry powders) comprised of organically capped nano-scale Ag particles and Sn. The Ag nanoparticles employed where synthesized with various organic molecules and procedures to produce particles with a range of capping thi...