Tetrapod nanocrystals as fluorescent stress probes of electrospun nanocomposites

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Shilpa N. Raja
  • Andrew C. K. Olson
  • Kari Thorkelsson
  • Andrew J. Luong
  • Lillian Hsueh
  • Guoqing Chang
  • Bernd Gludovatz
  • Liwei Lin
  • Ting Xu
  • A. Paul Alivisatos

Detail(s)

Original languageEnglish
Pages (from-to)3915-3922
Journal / PublicationNano Letters
Volume13
Issue number8
Online published5 Jul 2013
Publication statusPublished - 14 Aug 2013
Externally publishedYes

Abstract

A nanoscale, visible-light, self-sensing stress probe would be highly desirable in a variety of biological, imaging, and materials engineering applications, especially a device that does not alter the mechanical properties of the material it seeks to probe. Here we present the CdSe-CdS tetrapod quantum dot, incorporated into polymer matrices via electrospinning, as an in situ luminescent stress probe for the mechanical properties of polymer fibers. The mechanooptical sensing performance is enhanced with increasing nanocrystal concentration while causing minimal change in the mechanical properties even up to 20 wt % incorporation. The tetrapod nanoprobe is elastic and recoverable and undergoes no permanent change in sensing ability even upon many cycles of loading to failure. Direct comparisons to side-by-side traditional mechanical tests further validate the tetrapod as a luminescent stress probe. The tetrapod fluorescence stress-strain curve shape matches well with uniaxial stress-strain curves measured mechanically at all filler concentrations reported.

Research Area(s)

  • electrospinning, mechanical, Nanocomposite, nanocrystal, polymer, sensor

Citation Format(s)

Tetrapod nanocrystals as fluorescent stress probes of electrospun nanocomposites. / Raja, Shilpa N.; Olson, Andrew C. K.; Thorkelsson, Kari; Luong, Andrew J.; Hsueh, Lillian; Chang, Guoqing; Gludovatz, Bernd; Lin, Liwei; Xu, Ting; Ritchie, Robert O.; Alivisatos, A. Paul.

In: Nano Letters, Vol. 13, No. 8, 14.08.2013, p. 3915-3922.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review