One-step synthesis of TiO2/CdS nanocomposites by using microwave irradiation of a TiO2 + Cd2+-mercaptopropionic acid aqueous solution

Autor: D. S. Yoo, Sang Yeup Park, Changhwan Lim, Seong Y. Oh, Il Gon Kim, Sung Yong Ha, Sungmo Nam, Hee Jin Kim
Rok vydání: 2014
Předmět:
Zdroj: Journal of the Korean Physical Society. 64:436-442
ISSN: 1976-8524
0374-4884
Popis: A novel and simple microwave-assisted hydrothermal method for synthesizing high-quality TiO2/CdS nanocomposites was developed using TiO2 (P-90), CdCl2, and mercaptopropionic acid (MPA). The optical properties and the physical characteristics of the synthesized TiO2/CdS nanocrystals (NCs) depended on the conditions of microwave irradiation. Samples prepared with the same concentration of precursor were treated at different temperatures from 150 °C to 250 °C by using the microwave power. Consequently, the crystal structure of TiO2/CdS transformed from cubic to hexagonal. Transmission electron microscopy and energy-dispersive X-ray spectroscopy techniques confirmed that the fabricated TiO2/CdS were composed of heterogeneously bonded nanostructures. Analysis of the optical properties showed that the UV absorption spectra had a strong red-shift when the microwave heating temperature increased, which caused an increase in the size of the CdS NCs. The mean radius of the CdS NCs combined with TiO2 tended to increase from 3.7 nm to 13.1 nm. Photoluminescence (PL) measurements were used to investigate the PL peak of the fabricated TiO2/CdS under microwave irradiation at 250 °C, and they revealed a 24 nm Stoke’s shift from the absorption peak.
Databáze: OpenAIRE
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