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Pressed Bi nanocrystals synthesized by a simple colloidal method exhibited very high electrical conductivity of 104–105 S m−1 and extremely low thermal conductivity of 0.35 W m−1 K−1. The synthetic method can be used for the inexpensive preparation of highly efficient thermoelectric materials by engineering the size of nanocrystals (see picture; scale bar 50 nm; ZT=figure of merit).
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