The United States Department of Energy believe that they have figure out a way to use nano technology to build  electric circuits and chemical sensors by controlling a fabrication technique for drawing chemical patters as small as twenty nanometers.This has allowed researchers to use an atomic force microscope tip as a pen to deposit ink molecules through molecular diffusion onto the surface.  The ability to work with such precision enable researchers to use the tool like a soldering iron which means that more nano size devices can be created.

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