A luminescent nanocrystal stress gauge

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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 ... continued below

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Choi, Charina; Koski, Kristie; Olson, Andrew & Alivisatos, Paul October 25, 2010.

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Description

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.

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  • Journal Name: Proceedings of the National Academy of Sciences USA

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  • Report No.: LBNL-4668E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1023394
  • Archival Resource Key: ark:/67531/metadc833533

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  • October 25, 2010

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • June 16, 2016, 5:03 p.m.

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Choi, Charina; Koski, Kristie; Olson, Andrew & Alivisatos, Paul. A luminescent nanocrystal stress gauge, article, October 25, 2010; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc833533/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.