Journal Article

FZJ-2016-03638

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The effects of post-processing on the surface and the optical properties of copper indium sulfide quantum dots

Akdas, T. ; Distaso, M. ; Kuhri, S.FZJ* ; Winter, B. ; Birajdar, B. ; Spiecker, E. ; Guldi, D. M. ; Peukert, W. (Corresponding author)

2015
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jcis.2015.01.014

Abstract: In the current contribution we report on investigations regarding the surface of CuInS2 quantum dots andon different strategies to control the amount of surface ligands in a post-processing step. In particular, thereactivity 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 thereaction mixture and to detach excess organics from the surface of the nanocrystals is reported. Ournew method, which is based on the utilization of acids, is compared with standard purification proceduresby means of thermogravimetric analysis (TGA) with particular focus on its efficiency to removeorganics. 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. Furtheranalysis of the product by inductively coupled plasma optical emission spectroscopy (ICP-OES) is performedto 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 wellas recombination processes. Finally, the new method is optimized for the purification of CuInS2–ZnSnanocrystals, which show enhanced optical properties

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IEK-3)

Research Program(s):

1. 135 - Fuel Cells (POF3-135) (POF3-135)

Appears in the scientific report 2016

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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