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- W2479134675 abstract "Metal (Cu, Ag, Cd, etc) and semiconductor (e.g., CdSe) nano-disks having diameters of {approx}100-200{angstrom} and heights of 20-40{angstrom} are synthesized in the STM by the reduction of metal ions at graphite and Si(111) surfaces. These structures are produced by confining the electrochemical reduction -- which generates either the semiconductor or metal as an insoluble product -- between the STM tip and sample surface. The spatial selectivity of the synthesis reaction derives from a unique two-step mechanism in which a reactive site (i.e., a defect) is produced at the point of tunneling on the sample surface within 5 {mu}sec of the application of a bias pulse. Nucleation of the semiconductor or metal phase is then observed to occur on the high coordination sites of the defect and the subsequent growth of this structure is diffusion limited. Nano-disks of group II-VI and group I-VII semiconductors are accessible using either of two synthetic approaches." @default.
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- W2479134675 date "1993-12-31" @default.
- W2479134675 modified "2023-09-27" @default.
- W2479134675 title "Electrochemical synthesis of metal and semiconductor nano-disks using the STM" @default.
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