Department of Chemical Engineering, National Cheng Kung University, No. 1 University Rd., Tainan 70101, Taiwan, ROC.
J Colloid Interface Sci. 2011 Jun 15;358(2):409-15. doi: 10.1016/j.jcis.2011.03.010. Epub 2011 Mar 11.
We report the bioassisted synthesis of gold nanoparticle/silica (Au NP/silica) tubes using layer-by-layer (LBL) assembled poly(L-lysine)/poly(L-tyrosine) (PLL/PLT) multilayer films deposited on the polycarbonate (PC) membrane pores as both mediating agents and templates. The novelty of this approach is the in situ synthesis of Au NP/silica tubes using PLL/PLT multilayer films for sequential growth of Au NPs and silicas. The experimental data revealed that the buildup of the LBL multilayer films was mainly driven by the formation of hydrogen bond and the polypeptide macromolecular assemblies adopted mainly β-sheet conformation. The as-prepared Au NP/silica tubes possessed promising catalytic activity toward the reduction of p-nitrophenol. The synthesis conditions such as the concentration of gold precursor and polypeptide molecular weight were found to influence the gold weight ratio and particle size in the tubes and the catalytic properties of the Au NP/silica tubes. This approach provides a facile, robust, and green method to obtain nonaggregated metal nanoparticles immobilized in porous oxide network at ambient conditions. Using the synergy between biomimetic or bioassisted synthesis of nanostructured materials and LbL assembly technique, a variety of structures such as films, tubes, and capsules comprising of multiple compositions can be obtained.
我们报告了一种使用层层（LBL）组装的聚 L-赖氨酸/聚 L-酪氨酸（PLL/PLT）多层膜在聚碳酸酯（PC）膜孔上作为介导剂和模板辅助合成金纳米粒子/二氧化硅（Au NP/silica）管的生物辅助合成方法。这种方法的新颖之处在于使用 PLL/PLT 多层膜原位合成 Au NP/silica 管，用于 Au NPs 和硅的顺序生长。实验数据表明，LBL 多层膜的构建主要是由氢键的形成和多肽大分子组装主要采用β-折叠构象驱动的。所制备的 Au NP/silica 管对 p-硝基苯酚的还原具有良好的催化活性。发现合成条件，如金前驱体和多肽分子量的浓度，会影响管中 Au 的重量比和粒径以及 Au NP/silica 管的催化性能。这种方法在环境条件下提供了一种简便、稳健、绿色的方法，可获得固定在多孔氧化物网络中的非聚集金属纳米粒子。通过将仿生或生物辅助合成纳米结构材料与 LbL 组装技术相结合，可以获得多种结构，如包含多种成分的薄膜、管和胶囊。
