Ultrathin Films of TiO2 Nanoparticles at Interfaces

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• 作者：Keerti Choudhary ; V. Manjuladevi ; R. K. Gupta ; P. Bhattacharyya ; A. Hazra ; S. Kumar
• 刊名：Langmuir
• 出版年：2015
• 出版时间：February 3, 2015
• 年：2015
• 卷：31
• 期：4
• 页码：1385-1392
• 全文大小：578K
• ISSN：1520-5827

文摘

The properties of a material change remarkably as a result of the scaling dimensions. The Langmuir鈥揃lodgett (LB) film deposition technique is known to offer precise control over the film thickness and the interparticle separation. To form a well-ordered LB film, it is essential to form a stable Langmuir film at the air鈥搘ater interface. Here, we report our studies on ultrathin films of TiO₂ nanoparticles at air鈥搘ater and air鈥搒olid interfaces. The Langmuir film of TiO₂ nanoparticles at the air鈥搘ater interface was found to be very stable, and it exhibits loose-packing and close-packing phases. The LB films were transferred onto solid substrates for characterization and application. The surface morphology of the LB film was obtained by a field emission scanning electron microscope. The optical and electronic properties of the LB films of TiO₂ nanoparticles were studied using UV鈥搗is spectroscopy and current鈥搗oltage measurements, respectively. The LB film of TiO₂ nanoparticles was employed for ethanol gas sensing, and the sensing performance was compared to that of bulk material. Because of the enormous gain in the surface to volume ratio and the increase in crystalline defect density in the ultrathin LB film of TiO₂ nanoparticles, the LB film is found to be a potential functional layer for ethanol sensing as compared to the bulk material.