In Situ Transmission Electron Microscopy of Cadmium Selenide Nanorod Sublimation.
In situ electron microscopy is used to observe the morphological evolution of cadmium selenide nanorods as they sublime under vacuum at a series of elevated temperatures. Mass loss occurs anisotropically along the nanorod's long axis. At temperatures close to the sublimation threshold, the phase change occurs from both tips of the nanorods and proceeds unevenly with periods of rapid mass loss punctuated by periods of relative stability. At higher temperatures, the nanorods sublime at a faster, more uniform rate, but mass loss occurs from only a single end of the rod. We propose a mechanism that accounts for the observed sublimation behavior based on the terrace-ledge-kink (TLK) model and how the nanorod surface chemical environment influences the kinetic barrier of sublimation.
∥Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.|#Kavli Energy Nanosciences Institute, University of California, Berkeley and Lawrence Berkeley National Lab, Berkeley, California 94720, United States.
Daniel J
DJ
Hellebusch
#Kavli Energy Nanosciences Institute, University of California, Berkeley and Lawrence Berkeley National Lab, Berkeley, California 94720, United States.
Karthish
K
Manthiram
∥Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.|#Kavli Energy Nanosciences Institute, University of California, Berkeley and Lawrence Berkeley National Lab, Berkeley, California 94720, United States.
Brandon J
BJ
Beberwyck
∥Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.|#Kavli Energy Nanosciences Institute, University of California, Berkeley and Lawrence Berkeley National Lab, Berkeley, California 94720, United States.
A Paul
AP
Alivisatos
cadmium selenide; in situ TEM; nanorod; phase transition dynamics; sublimation