Combining Top-Down and Bottom-Up Routes for Fabrication of Mesoporous Titania Films Containing Ceria Nanoparticles for Free Radical Scavenging
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- 作者：Alessandra Pinna ; Barbara Lasio ; Massimo Piccinini ; Benedetta Marmiroli ; Heinz Amenitsch ; Paolo Falcaro ; Yasuaki Tokudome ; Luca Malfatti ; Plinio Innocenzi
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2013
- 出版时间：April 24, 2013
- 年：2013
- 卷：5
- 期：8
- 页码：3168-3175
- 全文大小：478K
- 年卷期：v.5,no.8(April 24, 2013)
- ISSN：1944-8252
文摘
Nanocomposite thin films formed by mesoporous titania layers loaded with ceria nanoparticles have been obtained by combining bottom-up self-assembly synthesis of a titania matrix with top-down hard X-ray lithography of nanocrystalline cerium oxide. At first the titania mesopores have been impregnated with the ceria precursor solution and then exposed to hard X-rays, which triggered the formation of crystalline cerium oxides within the pores inducing the in situ growth of nanoparticles with average size of 4 nm. It has been observed that the type of coordinating agent in the solution plays a primary role in the formation of nanoparticles. Different patterns have been also produced through deep X-ray lithography by spatially controlling the nanoparticle growth on the micrometer scale. The radical scavenging role of the nanocomposite films has been tested using as a benchmark the UV photodegradation of rhodamine 6G. After impregnation with a rhodamine 6G solution, samples with and without ceria have shown a remarkably different response upon exposure to UV light. The dye photodegradation on the surface of nanocomposite films appears strongly slowed down because of the antioxidation effect of ceria nanoparticles.