Chuang Tzu-Han, Lin Shih-Tien, Wen Ten-Chin, Jan Jeng-Shiung
Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
J Nanosci Nanotechnol. 2011 Jun;11(6):5247-57. doi: 10.1166/jnn.2011.4174.
Layer-by-layer (LbL) deposition of poly(L-lysine) (PLL) dissolved in different solutions and a water-soluble titania precursor, titanium(IV) bis(ammonium lactate) dihydroxide (TiBALDH) to form multilayer films on the wall of polycarbonate (PC) membrane pores was performed to prepare nanostructured titania-PLL composite and pure anatase and rutile titania tubes. A battery of analytical techniques was utilized to characterize and compare the structures, crystal phases, and photocatalytic properties of the titania tubes. In different solutions conditions, PLL which adopts secondary conformations (i.e., alpha-helix and random coil) and has varying interactions with different counterions (i.e., chloride and phosphate ions) can influence PLL/TiBALDH deposition and, in turn, results in the titania materials with different nanostructures and phtocatalytic properties. The influence of LbL assembly condition, deposition cycle, and polypeptide molecular weight on photocatalytic properties of resultant anatase titania tubes were further explored and these materials are promising photocatalyst with the advantage of easily handling and recycling. This reported approach may provide a facile and general way to prepare organic-inorganic composite and other inorganic materials with different compositions, structures, and properties for various applications.
将溶解于不同溶液中的聚-L-赖氨酸（PLL）与一种水溶性二氧化钛前驱体——二氢氧化双（乳酸铵）钛（IV）（TiBALDH）进行逐层（LbL）沉积，以在聚碳酸酯（PC）膜孔壁上形成多层膜，从而制备纳米结构的二氧化钛-PLL复合材料以及纯锐钛矿型和金红石型二氧化钛管。使用了一系列分析技术来表征和比较二氧化钛管的结构、晶相和光催化性能。在不同的溶液条件下，呈现二级构象（即α-螺旋和无规卷曲）且与不同抗衡离子（即氯离子和磷酸根离子）具有不同相互作用的PLL会影响PLL/TiBALDH的沉积，进而导致具有不同纳米结构和光催化性能的二氧化钛材料。进一步探究了LbL组装条件、沉积循环次数和多肽分子量对所得锐钛矿型二氧化钛管光催化性能的影响，这些材料是很有前景的光催化剂，具有易于处理和回收的优点。所报道的这种方法可能为制备具有不同组成、结构和性能的有机-无机复合材料及其他无机材料以用于各种应用提供一种简便通用的方法。
