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yalefield

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老汉一枚

[交流] 停停停,站站站,电荷分布不用算! 已有8人参与

IBM公司使用特殊的原子力显微镜——开尔文探针力显微镜,在低温环境和超高真空内,直接为单个萘酞菁有机分子内的电荷分布进行了成像。

http://www.nature.com/nnano/jour ... /nnano.2012.20.html

Imaging the charge distribution within a single molecule
Fabian Mohn, Leo Gross, Nikolaj Moll & Gerhard Meyer
Nature Nanotechnology (2012) doi:10.1038/nnano.2012.20

Scanning tunnelling microscopy and atomic force microscopy can be used to study the electronic and structural properties of surfaces, as well as molecules and nanostructures adsorbed on surfaces, with atomic precision, but they cannot directly probe the distribution of charge in these systems. However, another form of scanning probe microscopy, Kelvin probe force microscopy, can be used to measure the local contact potential difference between the scanning probe tip and the surface, a quantity that is closely related to the charge distribution on the surface. Here, we use a combination of scanning tunnelling microscopy, atomic force microscopy and Kelvin probe force microscopy to examine naphthalocyanine molecules (which have been used as molecular switches) on a thin insulating layer of NaCl on Cu(111). We show that Kelvin probe force microscopy can map the local contact potential difference of this system with submolecular resolution, and we use density functional theory calculations to verify that these maps reflect the intramolecular distribution of charge. This approach could help to provide fundamental insights into single-molecule switching and bond formation, processes that are usually accompanied by the redistribution of charge within or between molecules.

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crystal0714

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小木虫(金币+0.5):给个红包,谢谢回帖
做得好漂亮吖   越来越强大了
6楼2012-03-02 09:35:24
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三闲斋主

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优秀版主优秀版主

技术如此先进
2楼2012-03-01 10:08:46
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beipiao616

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小木虫(金币+0.5):给个红包,谢谢回帖
不知道什么时候国内才能有,早着呢
荆棘鸟
3楼2012-03-01 10:10:39
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天棚元帅

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额。。。强大。。。
A man gets what he earns when he earns it.
4楼2012-03-01 11:03:54
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