A two-dimensional structure graphene STM tips fabricated by microwave plasma enhanced chemical vapor deposition
A two-dimensional structure graphene STM tips fabricated by microwave plasma enhanced chemical vapor deposition
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DOI：
10.1016/j.carbon.2017.06.014
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发表时间：
2017-09
期刊：
影响因子：
10.9
通讯作者：
Shuai Tang;Yu Zhang;Yan Tian;Shunyu Jin;Peng Zhao;Fei Liu;R. Zhan;S. Deng;Jun Chen;N. Xu
中科院分区：
文献类型：
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作者：
Shuai Tang;Yu Zhang;Yan Tian;Shunyu Jin;Peng Zhao;Fei Liu;R. Zhan;S. Deng;Jun Chen;N. Xu
原子边缘、优异的导电性、稳定的化学和机械性能使石墨烯成为扫描隧道显微镜（STM）尖端的良好候选者。这里，采用一步生长方法来制造石墨烯 STM 尖端。采用微波等离子体增强化学气相沉积方法，无需任何催化剂，直接在锋利的钨尖上垂直生长石墨烯。高分辨率TEM图像表明，在生长过程中，钨表面形成了惰性W2C层，可以保护钨尖端的氧化，并使石墨烯STM尖端的电导率达到氧化钨尖端的4000倍。原位TEM场蒸发实验表明，石墨烯在24.7 V/nm的高电场下具有良好的稳定性。使用石墨烯 STM 尖端，获得了高取向热解石墨和二硫化钨的原子分辨率图像。我们的实验结果表明，石墨烯 STM 尖端可以在至少一周内获得原子分辨率图像。这是一种快速且经济地制造用于高分辨率成像的 STM 针尖的有前途的方法。
The atomic edge, excellent conductivity, stable chemical and mechanical properties make graphene a good candidate for the scanning tunneling microscopy (STM) tip. Here, a one-step growth method is used to fabricate graphene STM tips. The graphene was directly grown on a sharp tungsten tip vertically by using microwave plasma enhanced chemical vapor deposition method without any catalyst. The high resolution TEM image demonstrated that inert W2C layer was formed at the surface of tungsten during growth which can protect the oxidation of tungsten tip and promote the electric conductivity of graphene STM tip of 4000 times than the oxidative tungsten tip. The in situ TEM field evaporation experiments revealed that the graphene has a good stability under high electric field of 24.7 V/nm. Using the graphene STM tip, atomic resolution images of highly oriented pyrolytic graphite and tungsten disulfide were obtained. Our experiment results demonstrated the graphene STM tip was available to get atomic resolution image for at least one week. It is a promising approach to fabricate STM tips for high resolution imaging in a fast and economical way.