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- W2087171344 abstract "Weblike aggregates of coalesced Si nanocrystals are produced by a laser vaporization−controlled condensation technique. SEM micrographs show particles with ∼10 nm diameter but the Raman shift suggests the presence of particles as small as ∼4 nm. FTIR of the freshly prepared particles shows weak peaks due to the stretching, bending, and rocking vibrations of the Si−O−Si bonds, indicating the presence of a surface oxidized layer, SiOx (x < 2). Further oxidation of the Si core appears to be very slow and inefficient under ambient temperature, but annealing at higher temperatures facilitates the oxidation. The particles show luminescence properties that are similar to those of porous Si and Si nanoparticles produced by other techniques. The nanoparticles do not luminesce unless, by exposure to air, they acquire the SiOx passivated coating. They show a short-lived blue emission characteristic of the SiO2 coating and a biexponential longer-lived red emission. The short lifetime component of the red emission, ab..." @default.
- W2087171344 created "2016-06-24" @default.
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- W2087171344 date "1997-03-01" @default.
- W2087171344 modified "2023-09-25" @default.
- W2087171344 title "Surface Oxidation and Luminescence Properties of Weblike Agglomeration of Silicon Nanocrystals Produced by a Laser Vaporization−Controlled Condensation Technique" @default.
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- W2087171344 doi "https://doi.org/10.1021/jp963192m" @default.
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