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Chiral AuCuAu Heterogeneous Nanorods with Tailored Optical Activity

机译:具有定制光学活性的手性AuCuAu异质纳米棒

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Here, a facile wet-chemistry route for the selective growth of crystalline copper (Cu) along the sides of gold nanorods (Au NRs) in the presence of a hexadecylamine (HDA) is reported. The resulting heterostructures feature part etching of copper by galvanic replacement reaction and form crystalline AuCu alloy metal on one side of the Au NRs. By virtue of the dipeptide (cysteine-phenylalanine, Cys-Phe) ligand used during synthesis, the AuCuAu heteronanorods (HNRs) exhibit strong circular dichroism (CD) in the wavelength range of 400-1000 nm. The plasmonic chirality can be tailored by increasing the length of the Au NRs, the scale of Cu nanocrystals on the Au NRs, and the amount of gold chloride for postgrowth, resulting in an anisotropy factor (g factor) as high as 0.57 x 10(-2). The strong CD signals are attributed to the local electromagnetic field. Under circular polarized light (CPL) illumination, the chiral plasmonic AuCuAu nanostructure exhibits high efficiency for light polarization dependent reactive oxygen species (O-1(2)) that is 22.31 times that of Au NRs. The results of this study demonstrate that the chiral enantiomer provides a chirality dependent avenue for highly efficient phototherapy.
机译:在这里,报道了在十六烷基胺(HDA)存在下沿着金纳米棒(Au NRs)的侧面选择性生长结晶铜(Cu)的简便湿化学路线。所得的异质结构的特征在于通过电置换反应对铜进行部分蚀刻,并在Au NRs的一侧形成结晶AuCu合金金属。由于在合成过程中使用了二肽(半胱氨酸-苯丙氨酸,Cys-Phe)配体,AuCuAu异氰酸酯(HNR)在400-1000 nm的波长范围内表现出很强的圆二色性(CD)。可以通过增加Au NRs的长度,Au NRs上的Cu纳米晶体的大小和后生长的氯化金的量来定制等离子手性,导致各向异性因子(g因子)高达0.57 x 10( -2)。较强的CD信号归因于局部电磁场。在圆偏振光(CPL)照射下,手性等离子体AuCuAu纳米结构对依赖光偏振的活性氧(O-1(2))表现出高效率,是Au NRs的22.31倍。这项研究的结果表明,手性对映异构体为高效光疗提供了一种手性依赖性途径。

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