Work Function Lowering of Graphite by Sequential Surface Modifications: Nitrogen and Hydrogen Plasma Treatment
Work Function Lowering of Graphite by Sequential Surface Modifications: Nitrogen and Hydrogen Plasma Treatment
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DOI：
10.1021/acsomega.9b02208
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发表时间：
2019-09
期刊：
影响因子：
4.1
通讯作者：
Keishi Akada;Seiji Obata;K. Saiki
中科院分区：
文献类型：
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作者：
Keishi Akada;Seiji Obata;K. Saiki
石墨相关材料在各种器件和催化剂中发挥着重要作用。控制这类材料的性能对于拓宽其潜在的应用领域、提高其在场发射器件、燃料电池催化剂等方面的性能具有重要意义。特别地，功函数强烈地影响性能，因此迫切需要开发广泛调谐功函数的方法。在这里，我们实现了广泛的控制石墨的功函数的氮和氢等离子体处理。氢等离子体处理的时间和预先掺杂的氮原子的量可以控制石墨的功函数从2.9到5.0 eV。表面偶极层的形成和氮衍生的电子捐赠有助于这种功函数的降低，这有利于在各个领域中的应用。
Graphite-related materials play an important role in various kinds of devices and catalysts. Controlling the properties of such materials is of great significance to widen the potential applications and improve the performance of such applications as field emission devices and catalyst for fuel cells. In particular, the work function strongly affects the performance, and thus development of methods to tune the work function widely is urgently required. Here, we achieved wide-range control of the work function of graphite by nitrogen and hydrogen plasma treatments. The time of hydrogen plasma treatment and the amount of nitrogen atoms doped beforehand could control the work function of graphite from 2.9 to 5.0 eV. The formation of a surface dipole layer and the nitrogen-derived electron donation contributed to such lowering of the work function, which is advantageous for applications in various fields.