Layer-by-Layer Polypeptide Macromolecular Assemblies-Mediated Synthesis of Mesoporous Silica and Gold Nanoparticle/Mesoporous Silica Tubular Nanostructures

作者：Jan Jeng Shiung^*; Chuang Tzu Han; Chen Po Jui; Teng Hsisheng

来源：Langmuir, 2011, 27(6): 2834-2843.

DOI：10.1021/la103923c

A simple and versatile approach is proposed to use the LbL-assembled polypeptide macromolecular assemblies as mediating agents and templates for directed growth of gold nanoparticles and biomimetic silica mineralization, allowing the synthesis of polypeptide/silica and polypeptide/gold nanoparticle/silica composite materials, as well as mesoporous silica (meso-SiO2) and gold nanoparticle/mesoporous silica (Au NP/meso-SiO2). The formation of tubular nanostructures was demonstrated by silicification and growth of gold nanoparticles within macromolecular assemblies formed by poly(L-lysine) (PLL) and poly(L-glutamic acid) (PLGA) using polycarbonate membranes as templates. The experimental data revealed that the silicified macromolecular assemblies adopted mainly sheet/turn conformation. The as-prepared mesoporous silica materials possessed well-defined tubular structures with pore size and porosity depending on the size of sheet/turn aggregates, which is a function of the molecular weight of polypeptides. The directed growth of Au NP and subsequent silica mineralization in the macromolecular assembly resulted in Au NP/meso-SiO2 tubes with uniform nanoparticle size and the as-prepared materials exhibited promising catalytic activity toward the reduction of p-nitrophenol. This approach provides a facile and general method to synthesize organic inorganic composite materials, oxide and metal oxide nanomaterials with different compositions and structures.

• 出版日期2011-3-15