Nanocomposites of metallic copper in a silica-based glass have been prepared by the hot compaction of ion-exchanged and reduced glass powders. The diameter of copper particles ranges from 5.7 to 9.2 nm. The specimens exhibit a semiconducting behaviour in the temperature range 80 - 333 K with an unusually low activation energy of the order of 3.0 meV. This result appears to be consistent with a quantum size effect.
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Maity et al. (1996) studied this question.
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