纳米棒
离子键合
铜
材料科学
银纳米粒子
纳米颗粒
DNA
化学工程
纳米技术
化学
离子
冶金
生物化学
工程类
有机化学
作者
Héctor A. Becerril,Randall M. Stoltenberg,Christopher F. Monson,Adam T. Woolley
摘要
A straightforward procedure is presented for the fabrication of single-stranded DNA-templated silver nanorods and double-stranded DNA-templated copper nanorods with a low background of nonspecific metallic deposition. Alkali metal cations with high affinity for SiO2 are used to passivate the silicon surface, creating a physical and an electrostatic barrier against nonspecific silver or copper cation adsorption and subsequent metal deposition. For silver nanorods synthesized from single-stranded DNA, this ionic masking strategy leads to a 51% reduction in the number of nonspecifically deposited nanoparticles and an even greater decrease in their dimensions. For DNA-templated copper nanorods this surface blocking approach decreases the number of nonspecifically deposited nanoparticles by 74%. The demonstration of the use of single-stranded DNA as a template for nanorod fabrication is an important step toward the creation of nanoscale circuits by combining DNA metallization with direct surface hybridization of oligonucleotide-coupled, electronically active nanostructures at predetermined positions on single-stranded DNA.
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