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HighTemperature Stability of Passivated Silver ...(高温稳定的钝化银)
4342 J. Phys. Chem. B 1999, 103,
High-Temperature Stability of Passivated Silver Nanocrystal Superlattices
S. A. Harfenist
School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430
Z. L. Wang*
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
Recei ed: January 4, 1999; In Final Form: February 25, 1999
Ordered arrays of 4.5 nm diameter silver nanocrystals passivated with dodecanethiol show remarkable thermal
stability at temperatures up to 975 K. Defects in the ordered-assembly were the first areas to show signs of
melting while much of the structure remained intact. The mechanism for their stability is attributed to the
unusually strong inter-nanocrystal bond formed by the interpenetration of thiol chains between neighboring
nanocrystals within the nanocrystal superlattice. Individually dispersed nanocrystals show stability up to 800
K while some persist until 975 K.
The potential application of nanoscale materials in fields the aforementioned nanocrystals and their superlattices and show
ranging from biology to electronics has spurred remarkable that not only do individual passivated silver nanocrystals
interest and investigation into the preparation and characteriza- supported on an amorphous carbon film remain stable at
tion of identical, isolated, nanometer-scale entities composed temperatures near 800 K, but also that the silver nanocrystal
of materials such as metals,1,2 semiconductors,3 magnetic supercrystals (Ag NCSs) show structural stability near 975 K.
materials,4 and a wide variety of othe
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