MilliporeSigma

Investigation of the size-property relationship in CuInS2 quantum dots.

Nanoscale (2015-10-16)
T Akdas, J Walter, D Segets, M Distaso, B Winter, B Birajdar, E Spiecker, W Peukert
ABSTRACT

In this work we investigated fundamental properties of CuInS2 quantum dots in dependence of the particle size distribution (PSD). Size-selective precipitation (SSP) with acetone as poor solvent was performed as an adequate post-processing step. Our results provide deep insight into the correlation between particle size and various optical characteristics as bandgap energy, absorption and emission features and the broadness of the emission signal. These structure-property relationships are only achieved due to the unique combination of different analytical techniques. Our study reveals that the removal of 10 wt% of smallest particles from the feed results in an enhancement of the emission signal. This improvement is ascribed to a decreased quenching of the emission in larger particles. Our results reveal the impact of PSDs on the properties and the performance of an ensemble of multicomponent QDs and anticipate the high potential of controlling PSDs by well-developed post-processing.

MATERIALS
Product Number
Brand
Product Description

Supelco
Chloroform, suitable for HPLC, ≥99.8%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Acetone, ≥99%, meets FCC analytical specifications
Sigma-Aldrich
Chloroform, anhydrous, ≥99%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Chloroform, ACS reagent, ≥99.8%, contains amylenes as stabilizer
Sigma-Aldrich
Acetone, suitable for HPLC, ≥99.9%
Sigma-Aldrich
Chloroform, anhydrous, contains amylenes as stabilizer, ≥99%
Sigma-Aldrich
Chloroform, ACS reagent, ≥99.8%, contains 0.5-1.0% ethanol as stabilizer
Sigma-Aldrich
Acetone, natural, ≥97%
Supelco
Chloroform, analytical standard
Supelco
Chloroform, suitable for HPLC, ≥99.8%
Sigma-Aldrich
Chloroform, ≥99%, PCR Reagent, contains amylenes as stabilizer
Supelco
Acetone solution, certified reference material, 2000 μg/mL in methanol: water (9:1)
Sigma-Aldrich
Copper(I) acetate, 97%
Sigma-Aldrich
1-Octadecene, ≥95.0% (GC)
Sigma-Aldrich
1-Octadecene, technical grade, 90%
Sigma-Aldrich
1-Dodecanethiol, ≥98%
Sigma-Aldrich
Toluene, anhydrous, 99.8%
Supelco
Toluene, HPLC grade, 99.8%
Supelco
Acetone solution, contains 20.0 % (v/v) acetonitrile, suitable for HPLC