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arXiv 0908.0875cond-mat.mtrl-scicond-mat.mes-hall
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氮化硼纳米网:纳米冰的模板

Boron Nitride Nanomesh: A template for Nano-ice

Haifeng Ma, Thomas Brugger, Simon Berner, Yun Ding, Marcella Iannuzzi, Jurg Hutter, Jurg Osterwalder, Thomas Greber

摘要:

利用变温扫描隧道显微镜和dI/dz势垒高度谱研究了水在h-BN/Rh(111)纳米网上的结构。在其解吸温度以下,两种不同的水相在纳米网的3.2 nm晶胞内自组装。在2 nm的孔洞中,发现了约40个分子的有序纳米冰晶相,冰晶排列成双层蜂窝晶格,下层的氢原子指向基底。1 nm线上的相是低密度气相,其特征在于STM图像中的对比度调制和条纹噪声。隧道势垒测量推断质子在纳米冰簇中的位置。

英文摘要:

Using variable temperature scanning tunneling microscopy and dI/dz barrier height spectroscopy, the structure of water on h-BN/Rh(111) nanomesh has been investigated. Below its desorption temperature, two distinct phases of water self-assemble within the 3.2 nm unit cell of the nanomesh. In the 2 nm holes, an ordered phase of nano-ice crystals with about 40 molecules is found. The ice crystals arrange in a bilayer honeycomb lattice, where the hydrogen atoms of the lower layer point to the substrate. The phase on the 1 nm wires, is a low density gas phase, which is characterized by contrast modulations and streaky noise in the STM images. Tunneling barrier measurements infer the proton positions in the nano-ice clusters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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