Kundu Subrata, Lee Hyungoo, Liang Hong
Materials Science & Mechanical Engineering, Texas A & M University, College Station, Texas 77843-3123, USA.
Inorg Chem. 2009 Jan 5;48(1):121-7. doi: 10.1021/ic801791u.
A very fast, electroless, microwave method is described to synthesize electrically conductive CdS nanowires on DNA just within 60 s. The electrical characterization indicates that the CdS wires are continuous, have very low contact resistance, and exhibit Ohmic behavior. Highly selective deposition on DNA is obtained by specific complexation between the Cd(II) ion and DNA, followed by decomposition of thioacetamide to S(2-) to form CdS. The nanowires are found to have a diameter of 140-170 nm and a length of approximately 8-12 microm. The one-step process developed here does not perturb the overall conformation of the DNA chain. The nanowires we fabricated can be used as building blocks for functional nanodevices, tiny computers, sensors, and optoelectronics.
本文描述了一种非常快速的无电镀微波方法，可在60秒内就在DNA上合成导电硫化镉纳米线。电学特性表明，硫化镉纳米线是连续的，具有非常低的接触电阻，并表现出欧姆行为。通过镉（II）离子与DNA之间的特异性络合，随后硫代乙酰胺分解为S（2-）以形成硫化镉，从而实现了在DNA上的高度选择性沉积。发现纳米线的直径为140-170纳米，长度约为8-12微米。这里开发的一步法不会干扰DNA链的整体构象。我们制造的纳米线可用作功能性纳米器件、微型计算机、传感器和光电子学的构建块。
