NDLI: Effect of visible and UV irradiation on the aggregation stability of CdTe quantum dots

Content Provider	Springer Nature Link
Author	Tsipotan, Aleksei S. Gerasimova, Marina A. Aleksandrovsky, Aleksandr S. Zharkov, Sergey M. Slabko, Vitaliy V.
Copyright Year	2016
Abstract	The possibility of controlling the aggregation stability of CdTe quantum dots (QDs) stabilized by thioglycolic acid (TGA) is important for implementation of quasi-resonant laser-induced self-assembly. This study examines the influence of irradiation by the UV as well as by the visible light on the photostimulated aggregation of QDs. Different photochemical mechanisms are identified, depending on whether light wavelength falls into an interband transition or the first exciton transition. Irradiation by visible light does not lead to changes in the absorption spectra but decreases luminescence intensity through the detachment of TGA and the formation of dangling bonds, leading to the creation of radiativeless relaxation centers. UV irradiation (in the 300–370 nm range), at an intensity of 0.4 W/cm$^{2}$, initially (during the first 75 min) leads to the degradation of the stabilizer and QDs’ surface. After 75 min of combined UV and visible light irradiation, a gradual increase in spontaneous aggregation takes place, testifying excessive decrease in stabilizing potential barrier height. Hence, the laser-induced self-assembly of CdTe QDs is recommended to be performed over a time period of between 80 and 100 min after the beginning of low-intensity UV irradiation under conditions equivalent to those applied in this study.
Starting Page	1
Ending Page	8
Page Count	8
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	18
Issue Number	11
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-11-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanotechnology Quantum dots Photostimulated aggregation Photostability Colloids Laser-induced self-assembly Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Lasers, Photonics, Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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