Strain Monitoring via Self-Assembled Quantum Dots

Abstract:

Quantum dots (QDs) exhibit unique response of photoluminescence (PL) in response to mechanical deformation, which makes it possible to use QDs-epoxy resin composite in strain monitoring. In this work, gradient concentric rings consisting of QDs are prepared via the evaporation of chloroform droplets on pre-cast QDs/PMMA films, in which rigid spheres are used to pin the chloroform droplets and control the motion of the contact line of the chloroform droplets. Both the distance of adjacent rings (wavelength) and PL intensity are dependent on the size of rings and the thickness of the precast QDs/PMMA films. Using the gradient concentric rings consisting of QDs on the surface of a tensile bar of 304stainless steel, it is found that the distance of adjacent ring varies with tensile strain. This result demonstrates potential applications of self-assembled structures made of QDs in non-contact detection of mechanical deformation.

• Periodical: Applied Mechanics and Materials (Volume 853)
• Pages: 493-497
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.853.493
• Online since: September 2016
• Authors: Shao Fu Zhang, Shao Feng Yin, Wei Ling Luan*, Fu Qian Yang
• Keywords: Photoluminescence Intensity, Quantum Dots, Self-Assembly, Strain Gauge, Wavelength

References

[1] Z.M. Zhao, S.F. Yin, W.L. Luan, et al., Metal structural integrity monitoring via optical response of quantum dots-epoxy resin, J. Energy Procedia, 75 (2015) 2061–(2067).

DOI: 10.1016/j.egypro.2015.07.291

[2] R.D. Deegan, O. Bakunin, T. F Dupont, Capillary flow as the cause of ring stains from dried liquids, J. Nature. 389 (1997) 827-829.

DOI: 10.1038/39827

[3] P. Yunker, Suppression of the coffee-ring effect by shape-dependent capillary interactions, C. APS Meeting Abstracts. (2012) 308-311.

[4] R.D. Deegan. Pattern formation in drying drops, J. Physical Review E Statistical Physics Plasmas Fluids & Related Interdisciplinary Topics, 61 (2000) 475-85.

[5] W. Bi, X. Wu, E.K.L. Yeow, Unconventional multiple ring structure formation from evaporation-induced self-assembly of polymers, J. Langmuir, 28 (2012) 11056-11063.

DOI: 10.1021/la300697w

[6] X. Jun, et al., Evaporation-induced self-assembly of nanoparticles from a sphere-on-flat geometry, J. Angewandte Chemie International Edition, 119 (2007) 1892–1895.

DOI: 10.1002/ange.200604540

[7] W. Sun, F. Q Yang, Evaporation-induced formation of self-organized gradient concentric rings on sub-micron pre-cast PMMA films, J. Soft Matter, 10 (2014) 4451-4457.

DOI: 10.1039/c4sm00245h

[8] W. Sun, F. Q Yang, Evaporation-induced formation of self-organized gradient concentric rings on sub-micron pre-cast PMMA films, J. Soft Matter, 10 (2014) 4451-4457.

DOI: 10.1039/c4sm00245h

[9] Z. Wan, H.W. Yang, W.L. Luan, et al., Facile synthesis of monodisperse CdS nanocrystals via microreaction, J. Nanoscale Research Letters, 5 (2010) 130-137.

DOI: 10.1007/s11671-009-9454-z

[10] H.W. Yang, W.L. Luan, S.T. Tu, Z.M. Wang. High-temperature synthesis CdSe nanocrystals in a serpentine microchannel: wide size tunability achieved under a short residence time, J. Crystal Growth & Design, 9 (2009) 1569-1575.

DOI: 10.1021/cg800425f