期刊
MICRON
卷 43, 期 11, 页码 1078-1084出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.micron.2012.01.010
关键词
STEM; Brownian Motion; Liquid; Nanoparticles
类别
资金
- Division of Scientific User Facilities, U.S. Department of Energy
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory
- Vanderbilt University Medical Center
Immobilized gold nanoparticles were imaged in a liquid containing water and 50% glycerol with scanning transmission electron microscopy (STEM). The specimen was enclosed in a liquid compartment formed by two silicon microchips with electron transparent windows. A series of images was recorded at video frequency with a spatial resolution of 1.5 nm. The nanoparticles detached from their support after imaging them for several seconds at a magnification of 250,000. Their movement was found to be much different than the movement of nanoparticles moving freely in liquid as described by Brownian Motion. The direction of motion was not random-the nanoparticles moved either in a preferred direction, or radially outwards from the center of the image. The displacement of the gold nanoparticles over time was three orders of magnitude smaller than expected on the basis of Brownian Motion. This finding implies that nanoscale objects of flexible structure or freely floating, including nanoparticles and biological objects, can be imaged with nanoscale resolution, as long as they are in close proximity to a solid support structure. (c) 2012 Elsevier Ltd. All rights reserved.
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