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近年来,由于具有双螺旋补偿结构,DNA分子作为智能模版被广泛应用于设计棒状或管状类的纳米结构。本文报道了应用DNA双螺旋模版将CdS纳米粒子自组装为CdS纳米线。制备的CdS纳米线由几根纳米线紧密缠绕在一起,也呈螺旋形结构,该结构在无机材料中是很少见的。该结构形成的主要原因归功于CdS纳米粒子和DNA分子间的强烈静电互作用,由于含自由基的CdS纳米粒子带负电荷,而氨基的DNA核酸根带正电荷。研究结果表明应用DNA模版制备纳米线是一种简便、高效的技术和方法。同时,DNA模版法也为从底上制备纳米级的材料和物体提供了广阔的空间。
In recent years, due to the double-helix compensation structure, DNA molecules are widely used as smart templates to design rod-like or tubular nanostructures. This paper reports the self-assembly of CdS nanoparticles into CdS nanowires using DNA double helix template. The prepared CdS nanowires are closely intertwined by several nanowires and also have a spiral structure, which is rare in inorganic materials. The main reason for the formation of this structure is attributed to the strong electrostatic interaction between the CdS nanoparticles and the DNA molecules due to the negative charge of the CdS nanoparticles containing free radicals and the amino groups of the DNA nucleic acids of the amino groups being positively charged. The results show that the use of DNA template preparation of nanowires is a simple and efficient technology and methods. At the same time, the DNA template method also offers ample room to prepare nanoscale materials and objects from the bottom.