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Proc Natl Acad Sci U S A. 2010 Dec 14;107(50):21306-10. doi: 10.1073/pnas.1016022107. Epub 2010 Nov 22.

Luminescent nanocrystal stress gauge.

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1
Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

Abstract

Microscale mechanical forces can determine important outcomes ranging from the site of material fracture to stem cell fate. However, local stresses in a vast majority of systems cannot be measured due to the limitations of current techniques. In this work, we present the design and implementation of the CdSe-CdS core-shell tetrapod nanocrystal, a local stress sensor with bright luminescence readout. We calibrate the tetrapod luminescence response to stress and use the luminescence signal to report the spatial distribution of local stresses in single polyester fibers under uniaxial strain. The bright stress-dependent emission of the tetrapod, its nanoscale size, and its colloidal nature provide a unique tool that may be incorporated into a variety of micromechanical systems including materials and biological samples to quantify local stresses with high spatial resolution.

PMID:
21098301
PMCID:
PMC3003050
DOI:
10.1073/pnas.1016022107
[Indexed for MEDLINE]
Free PMC Article
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