Creation of Nanocrystals Through a Solid-Solid Phase Transition Induced by an STM Tip

Science  01 Nov 1996:
Vol. 274, Issue 5288, pp. 757-760
DOI: 10.1126/science.274.5288.757


A scanning tunneling microscope (STM) was used to fabricate T-phase tantalum diselenide (TaSe2) nanocrystals with sizes ranging from 7 to more than 100 nanometers within the surface layer of 2H-TaSe2 crystals at liquid helium temperature. Atomic-resolution images elucidate the structural changes between T- and H-phase regions and were used to develop an atomic model that describes a pathway for the production of T-phase nanocrystals from the H-phase crystal precursor through a solid-solid phase transition. The size-dependent properties of these nanocrystals may lead to improved understanding of the physics of charge density waves in small structures.

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