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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Viral assembly of oriented quantum dot nanowires
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Viral assembly of oriented quantum dot nanowires

机译：定向量子点纳米线的病毒组装

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The highly organized structure of M13 bacteriophage was used as an evolved biological template for the nucleation and orientation of semiconductor nanowires. To create this organized template, peptides were selected by using a pill phage display library for their ability to nucleate ZnS or CdS nanocrystals. The successful peptides were expressed as pVIII fusion proteins into the crystalline capsid of the virus. The engineered viruses were exposed to semiconductor precursor solutions, and the resultant nanocrystals that were templated along the viruses to form nanowires were extensively characterized by using high-resolution analytical electron microscopy and photoluminescence. ZnS nanocrystals were well crystallized on the viral capsid in a hexagonal wurtzite or a cubic zinc blende structure, depending on the peptide expressed on the viral capsid. Electron diffraction patterns showed single-crystal type behavior from a polynanocrystalline area of the nanowire formed, suggesting that the nanocrystals on the virus were preferentially oriented with their [001] perpendicular to the viral surface. Peptides that specifically directed CdS nanocrystal growth were also engineered into the viral capsid to create wurtzite CdS virus-based nanowires. Lastly, heterostructured nucleation was achieved with a dual-peptide virus engineered to express two distinct peptides within the same viral capsid. This work represents a genetically controlled biological synthesis route to a semiconductor nanoscale heterostructure. [References: 29]
机译：M13噬菌体的高度组织化的结构用作半导体纳米线的成核和取向的进化生物模板。为了创建这种有组织的模板，通过使用噬菌体噬菌体展示库选择肽，以使其具有使ZnS或CdS纳米晶体成核的能力。成功的肽以pVIII融合蛋白的形式表达到病毒的结晶衣壳中。将工程病毒暴露于半导体前体溶液中，并通过使用高分辨率分析电子显微镜和光致发光技术对沿着病毒模板化的纳米晶体形成纳米线进行了广泛表征。取决于在病毒衣壳上表达的肽，ZnS纳米晶体在六角形纤锌矿或立方锌混合结构中的病毒衣壳上可以很好地结晶。电子衍射图样显示了从形成的纳米线的多纳米晶区域起的单晶类型行为，这表明病毒上的纳米晶体优先以其[001]垂直于病毒表面的方向取向。专门指导CdS纳米晶体生长的肽也被工程化到病毒衣壳中，以创建纤锌矿基于CdS病毒的纳米线。最后，异源结构化成核是通过工程化以在同一病毒衣壳内表达两个不同肽的双肽病毒实现的。这项工作代表了到半导体纳米级异质结构的遗传控制生物合成途径。 [参考：29]

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