Stable colloidal dispersion of luminescing silicon nanoparticles for inkjet printing

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In this study, we synthesized Si-NPs with mean diameter about 4.2 nm in a microwave plasma reactor. In order to disperse these Si-NPs in organic solvent, the surface of freshly etched Si-NPs was modified with alkyl groups using thermally induced alkylation. The Si-NPs show PL emission in the visible with high PL intensity due to quantum confinement effects. Freshly etched and functionalized Si-NPs show bright red luminescence under UV illumination. The functionalized Si-NPs form stable and optically transparent dispersion in a variety of organic solvents due to presence of alkyl groups on their surface. The stable dispersions of functionalized Si-NPs in organic solvents were used to form functional Si-NPs films by inkjet-printing. The optical properties of printed layer were studied by photoluminescence spectroscopy indicating quenching effects and multi-phonon absorption.

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Journal: TechConnect Briefs
Volume: 2, Nanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational
Published: June 21, 2010
Pages: 538 - 541
Industry sectors: Advanced Materials & Manufacturing | Sensors, MEMS, Electronics
Topics: Inkjet Design, Materials & Fabrication
ISBN: 978-1-4398-3402-2