Screening and enrichment of metal nanoparticles with novel optical properties

Article Abstract:

The potential application of nanometer-scale colloidal particles in optoelectronic devices and single-molecule detection initiated scientific interest on their size and shapes. A study was conducted on a population of novel nanoparticles in heterogeneous silver colloids. Surface-enhanced Raman scattering (SERS) analysis was performed. The findings illustrate that nanoparticle enhancement in the colloidal samples was correlated with particle size. Moreover, the optical enhancement can achieve a maximum of 10%-15% using size-selective fractionation techniques.

Methods, Fractionation, Fractional distillation

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Ultrafast electronic relaxation dynamics in PbI2 semiconductor colloid nanoparticles: a femtosecond transient absorption study

Article Abstract:

Femtosecond transient absorption spectroscopy was used in studying ultrafast electronic relaxation in PbI2 colloidal nanoparticles. The method prescribed by Sandroff et al was utilized in synthesizing the nanoparticles at room temperature using various solvents but without surfactants. Results indicate that the absorption spectra for nanoparticles in acetonitrile and alcohol solvents have two major peaks at 360 and 292 nm. Nanoparticles are observed to have been formed in polyvinyl alcohol solvents due to the presence of a sharp excitonic peak at 414 nm.

Measurement, Semiconductors, Relaxation phenomena, Relaxation (Physics)

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Raman and electrochemical probes of the dissolution kinetics of tungsten in hydrogen peroxide

Article Abstract:

A study was conducted to analyze the interaction of tungsten and hydrogen peroxide using Raman spectroscopy and electrochemical measurements. The 514.5 mm line from a Coherent Innova 100 argon ion laser was utilized to carry out Raman spectroscopy. The tungsten plate was then partially immersed in a H2O2 solution to perform electrochemical measurements. Results indicated that peroxide increased the solubility of the tungsten trioxide.

Hydrogen peroxide, Electrochemistry, Tungsten

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