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研究9,9′-二亚呫吨分子在Ru(0001)上的吸附行为,在室温下通过扫描隧道电子显微镜观察石墨烯的自下而上制备过程.在亚单层体系中, 9,9′-二亚呫吨分子随机吸附在Ru(0001)上,简单分析了其空间结构;并以9,9′-二亚呫吨分子为前体,在Ru(0001)衬底上自下而上制备石墨烯,在超高真空中对Ru(0001)衬底进行长时间退火后,首次发现其具有3种不同旋转角(6.3°, 13.9°和16.1°)的摩尔超结构,迄今为止未见报道,并通过构建模型分析这3种摩尔超结构的形成机制.本实验为丰富Ru(0001)上摩尔超结构多样性作出了贡献,同时也对以石墨烯/Ru(0001)为基的科学研究打下基础. 相似文献
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Thin and thick films of iron phthalocyanine (FePc) molecules are deposited on a Ag (110) surface. The nature of the FePc growth and the interaction with the substrate have been studied by X-ray photoelectron spectroscopy (XPS). All of the core level spectra exhibit rigid shifts towards lower binding energies following the deposition of the organic films, each by a different magnitude. A greater change and a larger shift in the Fe2p level as compared to Cls core level reveals that the adsorbate interacts with the substrate mainly via the Fe atom, located at the center of the molecule. An increase/decrease in the intensity of C1 s/Ag3d level is found to be exponentially linked to the overlayer molecular coverage. Finally, the so- called growth/decay curve indicates that FePc thin films initially develop following the FM growth mode and then transform to SK mode, resulting in 3D island aggregation. 相似文献
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在超高真空系统中制备了C60的Yb填隙化合物薄膜.用x射线光电子能谱研究了Yb和C60结合过程中C1s,Yb4f和Yb4d的变化.利用Yb4f和C1s的谱峰强度确定出相纯样品的化学组分接近Yb2.75C60,这一结果与晶体x射线衍射结果一致.Yb4f和Yb4d的峰形与峰位表明化合物中Yb的价态为Yb2+.相纯样品(Yb2.75C60)的C1s峰位相对于纯C60向低结合能方向移动约0.5eV.C1s结合能减小说明有Yb6s电子转移到C60的最低未充填分子轨道能带上.结合能变化大小及峰宽的具体数值为进一步在薄膜样品上研究Yb2.75C60提供了表征样品的手段. 相似文献
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通过分析碱金属铯和一氧化碳在Ru(0001)表面上吸附体系的高分辨电子能量损失谱、低能电子衍射和热脱附谱,阐述了碱金属在过渡金属表面上的助催化作用.同时,实验结果表明碱金属Cs和CO在钌表面上的相互作用既包含有近程行为,又包含有长程作用.这种长程相互作用只能是间接的、通过衬底的相互作用. 相似文献