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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrical Transport in 'Few-Layer Graphene' Film Prepared by the Hot-Spray Technique: The Effect of Thermal Treatment
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Electrical Transport in 'Few-Layer Graphene' Film Prepared by the Hot-Spray Technique: The Effect of Thermal Treatment

机译：热喷涂技术制备的“很少层石墨烯”薄膜中的电传输：热处理的影响

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摘要

We investigate charge transport of a randomly stacked fevir-layer graphene (FLG) film supported on quartz plate, as-prepared and after annealing treatment. The film is prepared by a simple, cheap and rapid hot spray technique from a FLG suspension, while FLG was obtained in our previous report by high yield mechanical exfoliation of pencil lead. According to Hall Effect measurements, the annealing process has strong impact on the conductivity of the FLG film, despite its low oxygen/defect content as confirmed by X-ray photoelectron spectroscopy (XPS), Raman, and photoluminescense spectroscopy. The nonohmic behavior along with a sheet resistance (R_□) decreases from a few tens to a few kilo-ohms is observed for the FLG film, whereas after thermal treatment, a constant R_□ of 0.7 kΩ is recorded. The improvement of conductivity in the FLG film is attributed mainly to desorption of toluene from the FLG surface according to the TPD-MS analysis and not only to the oxygen decrease as generally reported.
机译：我们研究了在制备后以及经过退火处理后，在石英板上支撑的无规堆积的费维尔层石墨烯（FLG）薄膜的电荷传输。该薄膜是通过简单，廉价和快速的热喷涂技术由FLG悬浮液制备的，而FLG是在我们先前的报告中通过铅笔芯的高产量机械剥离获得的。根据霍尔效应的测量，退火工艺对FLG膜的电导率有很大影响，尽管X /射线光电子能谱（XPS），拉曼光谱和光致发光光谱法证实了氧/缺陷含量低。对于FLG膜，观察到非欧姆行为以及薄层电阻（R_□）从几十欧姆降低到几千欧姆，而在热处理之后，记录的恒定R_□为0.7kΩ。根据TPD-MS分析，FLG膜中电导率的提高主要归因于甲苯从FLG表面脱附，而不仅是如通常报道的那样，氧的减少。

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