Molecular molds

Mayne, A. J.; Soukiassian, L.; Commaux, N.; Comtet, G.; Dujardin, G.
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5379
Academic Journal
A problem in nanometer-scale applications that combine silicon technology with organic molecules, is the selective adsorption of organic molecules on the silicon surface. Reducing the active device size down to a single molecule requires a very precise geometry of the molecule–surface connection. Here, we report the room temperature adsorption of biphenyl or Trima molecules in artificially created individual molecular molds on a passivated silicon surface. These molecular molds are areas of clean silicon atoms with well defined geometries, fabricated by sequential removal of single hydrogen atoms from the hydrogenated silicon surface using the scanning tunneling microscope (STM) tip. The mold geometry can be controlled to adsorb the molecules at a selected place and in a desired orientation. The potential selection of molecules according to physical size or chemical properties is a step towards combined molecular and semiconductor chip technology.


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