Three-dimensional gold clusters deposited in UHV on clean natural graphite are imaged at the atomic level using scanning tunnelling microscopy (STM). After STM observation, the samples are characterized by transmission electron microscopy (TEM). The smallest observed gold clusters (1.0 to 1.5 nm) are close-packed, two atomic layers high, and stable over a period of time of at least 5 minutes.
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Humbert et al. (1989) studied this question.
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