Akdas T, Distaso M, Kuhri S, Winter B, Birajdar B, Spiecker E, Guldi DM, Peukert W (2015)
Publication Type: Journal article, Original article
Publication year: 2015
Publisher: Elsevier
Book Volume: 445
Pages Range: 337--347
Volume: 445
DOI: 10.1016/j.jcis.2015.01.014
In the current contribution we report on investigations regarding the surface of CuInS2 quantum dots and on different strategies to control the amount of surface ligands in a post-processing step. In particular, the reactivity of the organic components, that is, 1-dodecanthiol and 1-octadecene as ligand and solvent, respectively, during nanocrystal formation was studied. A new method to remove residuals from the reaction mixture and to detach excess organics from the surface of the nanocrystals is reported. Our new method, which is based on the utilization of acids, is compared with standard purification procedures by means of thermogravimetric analysis (TGA) with particular focus on its efficiency to remove organics. As a complement, the surface chemistry is analyzed by nuclear magnetic resonance spectroscopy (NMR) to shed light on the nature of the organic components still present after purification. Further analysis of the product by inductively coupled plasma optical emission spectroscopy (ICP-OES) is performed to verify the influence of the new purification method on surface composition and properties. Moreover, steady state and time resolved spectroscopies give insights into excitonic behavior as well as recombination processes. Finally, the new method is optimized for the purification of CuInS2-ZnS nanocrystals, which show enhanced optical properties.
APA:
Akdas, T., Distaso, M., Kuhri, S., Winter, B., Birajdar, B., Spiecker, E.,... Peukert, W. (2015). The effects of post-processing on the surface and the optical properties of copper indium sulfide quantum dots. Advances in Colloid and Interface Science, 445, 337--347. https://dx.doi.org/10.1016/j.jcis.2015.01.014
MLA:
Akdas, Tugce, et al. "The effects of post-processing on the surface and the optical properties of copper indium sulfide quantum dots." Advances in Colloid and Interface Science 445 (2015): 337--347.
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