论文标题
原子分辨率成像和测量石墨，金和硅状态的局部密度，使用扫描隧道显微镜
Atomic Resolution Imaging and Measurement of the Local Density of States of Graphite, Gold and Silicon using Scanning Tunnelling Microscopy
论文作者
论文摘要
使用STM仪器进行了一系列实验，该实验涉及通过测量隧穿电流的测量来分析样品表面。在本实验中，STM用于（1）通过获取其表面的原子分辨率图像来确定高度定向的热解石墨（HOPG）的晶格常数，（2）测量使用STS模式的金（AU）和Hopg样品的工作函数，并使用STS模式和（3）比较（3）比较（3）比较（3）比较（3）比较（3）比较（3）比较（Ldos）（Ldos）（ldos）（Ldos sip）（ldos sip）（ldos）（ldos sip）（ldos sip）（ldos sip）（ldos sip）（ldos sip）（ldos sip）（ldos sip）（ldos sip）（ldos sip）（ldos sip）（ldos sip）。 V.金和石墨的晶格常数的实验值分别确定为0.27 +/- 0.2 nm，0.7 +/- 0.1 eV和0.5 +/- 0.5 +/- 0.1 eV。晶格常数略微偏离文献值为0.246 nm，而工作功能显着偏离了黄金的文献值5.40 eV，而石墨的4.62 eV。发现黄金的LDO是最高的，其次是石墨，然后是硅。这些发现将被讨论。
A series of experiments were conducted using the STM instrument, which involves a conducting tip probe to analyse sample surfaces by measurements of a tunnelling current. In this experiment, STM was used to (1) determine the lattice constant of Highly Oriented Pyrolytic Graphite (HOPG) by acquiring atomic resolution images of its surface, (2) measure the work functions of gold (Au) and HOPG samples using the STS mode and, (3) compare the variation of the Local Density of States (LDOS) of gold, graphite and Silicon (Si) samples with respect to bias voltage V. Experimental values of the lattice constant of HOPG and work functions for gold and graphite were determined as 0.27 +/- 0.2 nm, 0.7 +/- 0.1 eV and 0.5 +/- 0.1 eV respectively. The lattice constant deviated slightly from the literature value of 0.246 nm, whereas the work functions deviated significantly from the literature values of 5.40 eV for gold and 4.62 eV for graphite. The LDOS for gold was found to be the highest, followed by graphite, then silicon. These findings will be discussed.
