Evaporation and decomposition of acrylic acid grafted luminescent silicon quantum dots in ultrahigh vacuum

Chao, Yimin ORCID: https://orcid.org/0000-0002-8488-2690, Wang, Qi, Coxon, Paul and Walton, Alex (2011) Evaporation and decomposition of acrylic acid grafted luminescent silicon quantum dots in ultrahigh vacuum. Journal of Physics: Conference Series, 286 (1). ISSN 1742-6588

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Abstract

A thin film of silicon quantum dots (Si-QDs) is a potential thermoelectric material with a high figure of merit. Evaporation and deposition in ultrahigh vacuum is a novel method to produce such a thin film of high quality. Acrylic acid grafted luminescent Si-QDs have been synthesized by a simplified method. Their surface electronic core levels were investigated by X-ray photoelectron spectroscopy (XPS) at various temperatures. At room temperature, three components at 100.4, 102, and 104.4 eV were identified, corresponding to Si core, Si-C, and silicon oxide on surface, respectively. The appearance of Si-C component showed that acrylic acid has been successfully grafted onto Si-QDs surface. At 200° C, intact evaporation took place and the ratios of silicon to carbon in core levels remained constant as the annealing time increased. Decomposition occured at 340°C, where the ratios of Si2p to C1s began to change. The XPS results are in agreement with thermogravimetric analysis (TGA) measurements which showed a sharp weight loss of 80% at 200° C, which is the intact evaporation temperature. Another slow weight loss of 14% took place between 300°C and 500°C, which is a footprint of surface Si-C decomposition.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Users 2731 not found.
Date Deposited: 02 Nov 2011 13:42
Last Modified: 25 Sep 2022 00:54
URI: https://ueaeprints.uea.ac.uk/id/eprint/35350
DOI: 10.1088/1742-6596/286/1/012039

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