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首页> 外文期刊>Japanese Journal of Applied Physics. Part 2, Letters & Express Letters >Graphitic cage transformation by electron-beam-induced catalysis with alkali-halide nanocrystals
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Graphitic cage transformation by electron-beam-induced catalysis with alkali-halide nanocrystals

机译：电子束诱导的碱金属卤化物纳米晶体的石墨笼转变

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摘要

We found that alkali-halide nanocrystals, such as KCl and NaCl, have strong catalytic capability to form graphitic carbon cages from amorphous carbon shells under electron beam irradiation. In addition to the electron beam irradiation strongly inducing the decomposition of alkali-halide nanocrystals, graphene fragments were formed and linked together to form the final product of thin graphitic carbon cages after the evaporation of alkali-halide nanocrystals. The required electron dose was approximately 1 to 20C/cm(2) at 120 keV at room temperature, which was about two orders of magnitude smaller than that required for conventional beam-induced graphitization. The "knock-on" effect of primary electrons strongly induced the decomposition of the alkali-halide crystal inside the amorphous carbon shell. However, the strong ionic cohesion quickly reformed the crystal into thin layers inside the amorphous shell. The bond excitation induced by the electron beam irradiation seemed to enhance strongly the graphitization at the interface between the outer amorphous carbon shell and the inner alkali-halide crystal. (C) 2016 The Japan Society of Applied Physics
机译：我们发现碱金属卤化物纳米晶体，例如KCl和NaCl，在电子束辐照下具有很强的催化能力，可以由无定形碳壳形成石墨碳笼。除了电子束照射强烈诱导卤化碱纳米晶体的分解外，还形成了石墨烯碎片，并将其链接在一起，从而在蒸发卤化碱纳米晶体之后形成了薄石墨碳笼的最终产物。室温下120 keV时所需的电子剂量约为1至20C / cm（2），比常规的束流诱导石墨化所需的电子剂量小约两个数量级。一次电子的“敲敲”效应强烈地导致了非晶碳壳内部碱金属卤化物晶体的分解。但是，强大的离子内聚力很快将晶体重整为非晶态壳内部的薄层。电子束辐照引起的键激发似乎极大地增强了外部无定形碳壳与内部碱金属卤化物晶体之间的界面处的石墨化。 （C）2016年日本应用物理学会

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    Fujita Jun-ichi; Tachi Masashi; Ito Naoto; Murakami Katsuhisa; Takeguchi Masaki;

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    Univ Tsukuba, Inst Appl Phys, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058573, Japan|Univ Tsukuba, Tsukuba Res Ctr Interdisciplinary Mat Sci, Tsukuba, Ibaraki 3058573, Japan;

    Univ Tsukuba, Inst Appl Phys, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058573, Japan|Univ Tsukuba, Tsukuba Res Ctr Interdisciplinary Mat Sci, Tsukuba, Ibaraki 3058573, Japan;

    Univ Tsukuba, Inst Appl Phys, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058573, Japan|Univ Tsukuba, Tsukuba Res Ctr Interdisciplinary Mat Sci, Tsukuba, Ibaraki 3058573, Japan;

    Univ Tsukuba, Inst Appl Phys, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058573, Japan|Univ Tsukuba, Tsukuba Res Ctr Interdisciplinary Mat Sci, Tsukuba, Ibaraki 3058573, Japan;

    Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan;

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