Journal
ACS NANO
Volume 7, Issue 9, Pages 7844-7852Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn402771j
Keywords
in situ transmission electron microscopy; nanoparticles; sublimation; kinetics; silver
Categories
Funding
- National Science Foundation [DMR 1006894]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006894] Funding Source: National Science Foundation
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In situ heating experiments were performed in a transmission electron microscope (TEM) to monitor the thermal stability of silver nanoparticles. The sublimation kinetics from isothermal experiments on individual nanoparticles was used to assess the actual temperatures of the nanoparticles by considering the localized heating from the electron beam. For isolated nanoparticles, beam heating under normal TEM operating conditions was found to increase the temperature by tens of degrees. For nominally isothermal experiments, the observed sublimation temperatures generally decreased with decreasing particle size, in agreement with the predictions from the Kelvin equation. However, sublimation of smaller nanoparticles was often observed to occur in discrete steps, which led to faceting of the nanoparticles. This discrete behavior differs from that predicted by conventional theory as well as from experimental observations in larger nanoparticles where sublimation was continuous. A hypothesis that explains the mechanism for this size-dependent behavior is proposed.
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