Mechanisms of local stress sensing in multifunctional polymer films using fluorescent tetrapod nanocrystals
Abstract
Nanoscale stress-sensing can be used across fields ranging from detection of incipient cracks in structural mechanics to monitoring forces in biological tissues. We demonstrate how tetrapod quantum dots (tQDs) embedded in block-copolymers act as sensors of tensile/compressive stress. Remarkably, tQDs can detect their own composite dispersion and mechanical properties, with a switch in optomechanical response when tQDs are in direct contact. Using experimental characterizations, atomistic simulations and finite-element analyses, we show that under tensile stress, densely-packed tQDs exhibit a photoluminescence peak shifted to higher energies (“blue-shift”) due to volumetric compressive stress in their core; loosely-packed tQDs exhibit a peak shifted to lower energies (“red-shift”) from tensile stress in the core. The stress-shifts result from the tQD's unique branched morphology in which the CdS arms act as antennas that amplify the stress in the CdSe core. Our nanocomposites exhibit excellent cyclability and scalability with no degraded properties of the host polymer. Colloidal tQDs allow sensing in many materials to potentially enable auto-responsive, smart structural nanocomposites that self-predict impending fracture.
- Inventors:
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1576254
- Patent Number(s):
- 10429256
- Application Number:
- 15/607,158
- Assignee:
- The Regents of the University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C08 - ORGANIC MACROMOLECULAR COMPOUNDS C08J - WORKING-UP
C - CHEMISTRY C08 - ORGANIC MACROMOLECULAR COMPOUNDS C08K - Use of inorganic or non-macromolecular organic substances as compounding ingredients
- DOE Contract Number:
- AC02-05CH11231
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2017 May 26
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY
Citation Formats
Raja, Shilpa N., Zherebetskyy, Danylo, Wu, Siva, Ercius, Peter, Olson, Andrew C. K., Alvisatos, Paul, Ritchie, Robert O., and Govindjee, Sanjay. Mechanisms of local stress sensing in multifunctional polymer films using fluorescent tetrapod nanocrystals. United States: N. p., 2019.
Web.
Raja, Shilpa N., Zherebetskyy, Danylo, Wu, Siva, Ercius, Peter, Olson, Andrew C. K., Alvisatos, Paul, Ritchie, Robert O., & Govindjee, Sanjay. Mechanisms of local stress sensing in multifunctional polymer films using fluorescent tetrapod nanocrystals. United States.
Raja, Shilpa N., Zherebetskyy, Danylo, Wu, Siva, Ercius, Peter, Olson, Andrew C. K., Alvisatos, Paul, Ritchie, Robert O., and Govindjee, Sanjay. Tue .
"Mechanisms of local stress sensing in multifunctional polymer films using fluorescent tetrapod nanocrystals". United States. https://www.osti.gov/servlets/purl/1576254.
@article{osti_1576254,
title = {Mechanisms of local stress sensing in multifunctional polymer films using fluorescent tetrapod nanocrystals},
author = {Raja, Shilpa N. and Zherebetskyy, Danylo and Wu, Siva and Ercius, Peter and Olson, Andrew C. K. and Alvisatos, Paul and Ritchie, Robert O. and Govindjee, Sanjay},
abstractNote = {Nanoscale stress-sensing can be used across fields ranging from detection of incipient cracks in structural mechanics to monitoring forces in biological tissues. We demonstrate how tetrapod quantum dots (tQDs) embedded in block-copolymers act as sensors of tensile/compressive stress. Remarkably, tQDs can detect their own composite dispersion and mechanical properties, with a switch in optomechanical response when tQDs are in direct contact. Using experimental characterizations, atomistic simulations and finite-element analyses, we show that under tensile stress, densely-packed tQDs exhibit a photoluminescence peak shifted to higher energies (“blue-shift”) due to volumetric compressive stress in their core; loosely-packed tQDs exhibit a peak shifted to lower energies (“red-shift”) from tensile stress in the core. The stress-shifts result from the tQD's unique branched morphology in which the CdS arms act as antennas that amplify the stress in the CdSe core. Our nanocomposites exhibit excellent cyclability and scalability with no degraded properties of the host polymer. Colloidal tQDs allow sensing in many materials to potentially enable auto-responsive, smart structural nanocomposites that self-predict impending fracture.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {10}
}
Works referenced in this record:
Systems and Methods of Detecting Force and Stress Using Tetrapod Nanocrystal
patent-application, August 2012
- Choi, Charina L.; Koski, Kristie J.; Sivasankar, Sanjeevi
- US Patent Application 13/357845; 20120211670