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Chemical synthesis and optical, structural, and surface characterization of InP-In2O3 quantum dots.


ABSTRACT: InP-In2O3 colloidal quantum dots (QDs) synthesized by a single-step chemical method without injection of hot precursors (one-pot) were investigated. Specifically, the effect of the tris(trimethylsilyl)phosphine, P(TMS)3, precursor concentration on the QDs properties was studied to effectively control the size and shape of the samples with a minimum size dispersion. The effect of the P(TMS)3 precursor concentration on the optical, structural, chemical surface, and electronic properties of InP-In2O3 QDs is discussed. The absorption spectra of InP-In2O3 colloids, obtained by both UV-Vis spectrophotometry and photoacoustic spectroscopy, showed a red-shift in the high-energy regime as the concentration of the P(TMS)3 increased. In addition, these results were used to determine the band-gap energy of the InP-In2O3 nanoparticles, which changed between 2.0 and 2.9 eV. This was confirmed by Photoluminescence spectroscopy, where a broad-band emission displayed from 2.0 to 2.9 eV is associated with the excitonic transition of the InP and In2O3 QDs. In2O3 and InP QDs with diameters ranging approximately from 8 to 10 nm and 6 to 9 nm were respectively found by HR-TEM. The formation of the InP and In2O3 phases was confirmed by X-ray Photoelectron Spectroscopy.

SUBMITTER: Granada-Ramirez DA 

PROVIDER: S-EPMC7375344 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Chemical synthesis and optical, structural, and surface characterization of InP-In<sub>2</sub>O<sub>3</sub> quantum dots.

Granada-Ramirez D A DA   Arias-Cerón J S JS   Pérez-González M M   Luna-Arias J P JP   Cruz-Orea A A   Rodríguez-Fragoso P P   Herrera-Pérez J L JL   Gómez-Herrera M L ML   Tomás S A SA   Vázquez-Hernández F F   Durán-Ledezma A A AA   Mendoza-Alvarez J G JG  

Applied surface science 20200722


InP-In<sub>2</sub>O<sub>3</sub> colloidal quantum dots (QDs) synthesized by a single-step chemical method without injection of hot precursors (one-pot) were investigated. Specifically, the effect of the tris(trimethylsilyl)phosphine, P(TMS)<sub>3</sub>, precursor concentration on the QDs properties was studied to effectively control the size and shape of the samples with a minimum size dispersion. The effect of the P(TMS)<sub>3</sub> precursor concentration on the optical, structural, chemical s  ...[more]

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