金属Au纳米膜的电子输运及非线性效应

使用Matlab软件对N方势垒在偏压下电流随电压的变化关系进行了模拟计算,计算结果表明N方势垒的伏安特性（I-V）曲线上显现出非线性效应和震荡效应。利用溅射方法将Au颗粒沉积在经过电化学腐蚀处理的硅基片上,得到具有纳米结构的Au膜。采用SEM对基片表面上的金膜进行观察,发现了纳米颗粒的聚集体,样品的I-V曲线测试结果表明：常温下,测得电流在0至1.5×10^-6A范围内,样品电阻率呈非线性电阻效应和振荡效应;N方势垒模型的模拟计算结果与实验测量结果很好的吻合。

Electron transport in nanostructured gold films and nonlinear electrical conductivity characteristics

Scattering of free particles by a one dimensional multi-barrier has been investigated, and the relationship between the current and voltage of the multi-barrier was calculated using Matlab software. The calculation results indicate that the volt-ampere curve possessed oscillation phenomena and nonlinear characteristics. We also discuss the influence of different structures of N-barrier systems on the volt-ampere graph. A silicon substrate was prepared using an etched silicon wafer. The etchant was a mixed solution of HF and ethanol. Films of different thickness were produced on silicon substrates by sputter deposition. The sample surface morphology was observed by field emission scanning electron microscopy (SEM). The results showed that the films were composed of discontinuous metal particles. The I-V characteristics curves were nonlinear and started to oscillate at a certain voltage. Excellent agreement between experimental data and model calculations was found.