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Phage-directed synthesis of copper sulfide: Structural and optical characterization

机译:噬菌体指导的硫化铜合成:结构和光学表征

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The growth of crystalline copper sulfide using a viral template was investigated using sequential incubation in CuCl_2 and Na_2S precursors. Non-specific electrostatic attraction between a genetically-modified M13 bacteriophage and copper cations in the CuCl _2 precursor caused phage agglomeration and bundle formation. Following the addition of Na_2S, polydisperse nanocrystals 2-7 nm in size were found along the length of the viral scaffold. The structure of the copper sulfide material was identified as cubic anti-fluorite type Cu _(1.8)S, space group. Strong interband absorption was observed within the ultraviolet to visible range with an onset near 800 nm. Furthermore, free carrier absorption, associated with the localized surface plasmon resonance of the copper sulfide nanocrystals, was seen in the near infrared with absorbance maxima at 1060 nm and 3000 nm, respectively.
机译:通过在CuCl_2和Na_2S前体中进行顺序孵育,研究了使用病毒模板生长结晶硫化铜的方法。基因修饰的M13噬菌体与CuCl _2前体中的铜阳离子之间的非特异性静电吸引导致噬菌体聚集和束形成。在添加Na_2S之后,沿着病毒支架的长度发现了尺寸为2-7nm的多分散纳米晶体。硫化铜材料的结构被确定为立方抗萤石型Cu _(1.8)S,空间群。在紫外到可见光范围内观察到强烈的带间吸收,起始波长接近800 nm。此外,在近红外中观察到与硫化铜纳米晶体的局部表面等离子体共振相关的自由载流子吸收,其最大吸收分别在1060nm和3000nm。

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