Xu Bingqian, Tao Nongjian J
Department of Electrical Engineering and The Center for Solid State Electronics Research, Arizona State University, Tempe, AZ 85287, USA.
Science. 2003 Aug 29;301(5637):1221-3. doi: 10.1126/science.1087481.
The conductance of a single molecule connected to two gold electrodes was determined by repeatedly forming thousands of gold-molecule-gold junctions. Conductance histograms revealed well-defined peaks at integer multiples of a fundamental conductance value, which was used to identify the conductance of a single molecule. The resistances near zero bias were 10.5 +/- 0.5, 51 +/- 5, 630 +/- 50, and 1.3 +/- 0.1 megohms for hexanedithiol, octanedithiol, decanedithiol, and 4,4' bipyridine, respectively. The tunneling decay constant (betaN) for N-alkanedithiols was 1.0 +/- 0.1 per carbon atom and was weakly dependent on the applied bias. The resistance and betaN values are consistent with first-principles calculations.
通过反复形成数千个金-分子-金结来测定连接到两个金电极的单个分子的电导。电导直方图显示在一个基本电导值的整数倍处有明确的峰值，该基本电导值用于确定单个分子的电导。对于己二硫醇、辛二硫醇、癸二硫醇和4,4'-联吡啶，零偏压附近的电阻分别为10.5±0.5、51±5、630±50和1.3±0.1兆欧。N-链烷二硫醇的隧穿衰减常数（βN）为每个碳原子1.0±0.1，且对施加的偏压弱依赖。电阻和βN值与第一性原理计算结果一致。
