Mesoporous TiO2 Core鈥揝hell Spheres Composed of Nanocrystals with Exposed High-Energy Facets: Facile Synthesis and Formation Mechanism

详细信息    查看全文

• 作者：Baoshun Liu ; Kazuya Nakata ; Munetoshi Sakai ; Hidenori Saito ; Tsuyoshi Ochiai ; Taketoshi Murakami ; Katsuhiko Takagi ; Akira Fujishima
• 刊名：Langmuir
• 出版年：2011
• 出版时间：July 5, 2011
• 年：2011
• 卷：27
• 期：13
• 页码：8500-8508
• 全文大小：1358K
• 年卷期：v.27,no.13(July 5, 2011)
• ISSN：1520-5827

文摘

A facile new method that combines electrospray and hydrothermal treatment is used to prepare mesoporous core鈥搒hell TiO₂ spheres with high specific surface areas and high pore volumes. Interestingly, the resulting TiO₂ spheres are composed of anatase TiO₂ nanocrystals with exposed step-like {001} and smooth {010} facets. The percentage of exposed {001} facets can be adjusted by changing the experimental parameters used in the electrospray and hydrothermal treatment processes, such as the contents of poly(N-vinyl-2-pyrrolidone) and acetic acid. The combination of high specific surface area (>100 m² g^鈥?), high pore volume (>0.30 cm³ g^鈥?), useful pore size (10鈥?5 nm), spherical core鈥搒hell structure, and exposed high energy facets makes these TiO₂ spheres an important candidate for use in many photoelectrochemical applications. The formation mechanism of the mesoporous TiO₂ spheres is also studied. The great advantage of this method is that interesting and complicated mesoporous superstructures can be prepared using electrospray technology.