Hydrothermal Synthesis of Single-Crystalline Perovskite PbTiO3 Nanosheets with Dominant (001) Facets

详细信息    查看全文

• 作者：Shiqi Deng ; Gang Xu ; Huiwen Bai ; Lingling Li ; Shan Jiang ; Ge Shen ; Gaorong Han
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：October 20, 2014
• 年：2014
• 卷：53
• 期：20
• 页码：10937-10943
• 全文大小：460K
• ISSN：1520-510X

文摘

Single-crystalline tetragonal perovskite lead titanate (PbTiO₃) nanosheets with dominant (001) facets have been successfully synthesized by employing layered K₂Ti₆O₁₃ nanofibers as titanium sources. The as-prepared PbTiO₃ nanosheets were characterized by means of X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and selected-area electron diffraction. In order to understand the formation mechanism of the PbTiO₃ nanosheets, a series of time-dependent experiments were performed. Because of the substitution of Pb²⁺ ions for K⁺ ions, the TiO₆ octahedral lamellas exfoliate from the layered K₂Ti₆O₁₃ crystal structure. Then the exfoliated TiO₆ octahedral lamellas as templates transform to lamellar PbTiO₃ species by reacting with the dehydrated Pb²⁺ ions. With hydrothermal treatment prolongation, the lamellar PbTiO₃ species crystallize to single-crystalline PbTiO₃ nanosheets. Moreover, the thickness of the synthesized single-crystalline PbTiO₃ nanosheets can be tailored in the range of 10鈥?0 nm by controlling the hydrothermal treatment time. In addition, the band gap and the optoelectronic properties of the single-crystalline PbTiO₃ nanosheets are investigated by UV鈥搗is absorption and photoluminescence.