Direct Synthesis of Inverse Hexagonally Ordered Diblock Copolymer/Polyoxometalate Nanocomposite Films

详细信息    查看全文

• 作者：Thomas Lunkenbein ; Marleen Kamperman ; Zihui Li ; Carina Bojer ; Markus Drechsler ; Stephan F枚rster ; Ulrich Wiesner ; Axel H. E. M眉ller ; Josef Breu
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：August 1, 2012
• 年：2012
• 卷：134
• 期：30
• 页码：12685-12692
• 全文大小：509K
• 年卷期：v.134,no.30(August 1, 2012)
• ISSN：1520-5126

文摘

Nanostructured inverse hexagonal polyoxometalate composite films were cast directly from solution using poly(butadiene-block-2-(dimethylamino)ethyl methacrylate) (PB-b-PDMAEMA) diblock copolymers as structure directing agents for phosphomolybdic acid (H₃[PMo₁₂O₄₀], H₃PMo). H₃PMo units are selectively incorporated into the PDMAEMA domains due to electrostatic interactions between protonated PDMAEMA and PMo^{3鈥?/sup> anions. Long solvophilic PB chains stabilized the PDMAEMA/H₃PMo aggregates in solution and reliably prevented macrophase separation. The choice of solvent is crucial. It appears that all three components, both blocks of the diblock copolymer as well as H₃PMo, have to be soluble in the same solvent which turned out to be tetrahydrofuran, THF. Evaporation induced self-assembly resulted in highly ordered inverse hexagonal nanocomposite films as observed from transmission electron microscopy and small-angle X-ray scattering. This one-pot synthesis may represent a generally applicable strategy for integrating polyoxometalates into functional architectures and devices.}