Semiconductor nanoparticles in contact: quenching of the photoluminescence from silicon nanocrystals by WO3 nanoparticles suspended in solution

Article Abstract:

The potential industrial applications of silicon-based (Si) nanostructured materials have inspired scientific investigations into the synthesis and properties of Si nanocrystals. X-ray diffraction, Fourier transform infrared and Raman spectroscopic studies were performed. Quenching of the red emission or photoluminescence in Si nanocrystals was observed following the addition of WO3 nanoparticles to the Si nanoparticles. The electron transfer from the Si-conduction-band (CB) to the CB of the WO3 nanoparticles explains the quenching mechanism.

Particles, Particulate matter, Tungsten compounds, Silicon crystals

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Decay dynamics and quenching of photoluminescence from silicon nanocrystals by aromatic nitro compounds

Article Abstract:

The decay dynamics and the quenching of the photoluminescence (PL) from Si nanocrystals are examined. Results reveal that the quenching mechanism occurs via an electron transfer from the conduction band (CB) edge of the Si nanocrystals to the vacant orbitals of the quenchers, which are consistent with a quantum-confinement model, where recombination of electrons and holes occurs in a surface state.

Cyclic Crude and Intermediate Manufacturing, Nitrated Aromatics, Nitroaromatic compounds, Chemical properties

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Vapor phase growth and assembly of metallic, intermetallic, carbon, and silicon nanoparticle filaments

Article Abstract:

A new class of nanoparticles and tree-like aggregates is assembled by the influence of an electric filed during the synthesis of metallic, intermetallic, carbon, and silicon nanoparticles from the vapor phase. Enormous electrostatic aggregation due to dipole forces is observed between the nanoparticles to form chain filaments, and between the chain filaments to form tree-like fibers.

Electric properties, Carbon, Electrostatics, Chemistry, Physical and theoretical, Physical chemistry

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