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

Chao, Yimin, 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: 28 Oct 2019 15:36
URI: https://ueaeprints.uea.ac.uk/id/eprint/35350
DOI: 10.1088/1742-6596/286/1/012039

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