کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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608589 | 880604 | 2011 | 7 صفحه PDF | دانلود رایگان |
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.
The bioassisted synthesis of catalytic gold nanoparticle/silica (Au NP/silica) tubes using layer-by-layer assembled poly(l-lysine)/poly(l-tyrosine) (PLL/PLT) multilayer films was demonstrated.Figure optionsDownload high-quality image (47 K)Download as PowerPoint slideHighlights
► Polypeptide-mediated synthesis of catalytic gold nanoparticle/silica tubes.
► PLL/PLT multilayer films for sequential growth of Au NPs and silicas.
► A novel approach to obtain metal NPs immobilized in oxides at ambient conditions.
► Synergy between bioassisted synthesis of nanomaterials and LbL assembly technique.
Journal: Journal of Colloid and Interface Science - Volume 358, Issue 2, 15 June 2011, Pages 409–415