A facile single injection Hydrothermal method for the synthesis of thiol capped CdTe Quantum dots as light harvesters

Abstract

a b s t r a c tA facile, Single Injection Hydrothermal (SIH) method has been developed to synthesize high quality 3-Mercaptopropionic Acid (MPA) stabilized aqueous CdTe QDs, entirely in ambient environment. The synthesis protocol eliminates the use of inert atmosphere for reducing elemental Tellurium powder to Te precursor avoiding the oxidation of Te powder. The XRD result revealed that the synthesized QDs are in cubic zincblende type crystalline structure, without signature of Te oxidation. FTIR spectra have confirmed the attachment of short chained organic compound MPA to the surface of QDs by covalent bond. The Quantum confinement effect was clearly evident by shift in Longitudinal Optic (LO) peak of Raman spectra and absorption peak wavelength with respect to bulk CdTe materials. The optical direct band gap energy of CdTe QDs is between 3.63 eV to 1.96 eV and QDs size below 6 nm, confirm the QDs are well under strong Quantum confinement regime. Also, photoluminescence spectra depict a stable and high luminescence emission from green to dark red color. All these results corroborate that the synthesis of CdTe QDs procedure is very advantageous and present a simple, economical and easily up scalable method for large scale production.

Concentration-dependent optical properties of TGA stabilized CdTe Quantum dots synthesized via the single injection hydrothermal method in the ambient environment

“…TGA-capped CdTe QDs were synthesized in two different concentration of TGA to Cd ratio, using SIH method in the complete ambient atmosphere. The detailed synthesis procedure is given in our previews work MPA-capped CdTe QDs [3] and a brief synthesis protocol is described in this paper. The synthesis process consists of three parts.…”

“…Here oxidation of Te in ambient is prevented by insult generated H 2 gas, which intern reduces the oxygen inside the conical flask. Further, NaHTe formation can be seen from the change in color from dark black solution to clear solution with the liberation of H 2 gas Equation (3) [3]. Then from a clear solution to dark pink color, at this stage 2 ml (of 10 ml) NaHTe is injected to Cd precursor.…”

Quantum dot photolithography using a quantum dot photoresist composed of an organic–inorganic hybrid coating layer

“…S3. 22 It was found that the SC1230 film uniform than the SC1320 film despite the higher wt% of QDs. Aggregation was observed in SC1320 due to the low weight ratio of colloidal silica, although the QDs were mixed in a low weight ratio.…”

I-V Characteristics of Cadmium Telluride Quantum Dots Diode Fabricated by Drop Casting Method

“…However for the completeness of the information about the material, method of synthesis and properties like structure, size and conductivity are mentioned in the present article. To begin with CdTe QDs are synthesized by single injection hydrothermal (SIH) method described by Jai et.al [11]. SIH synthesis technique is a less expensive technique which can be done in a normal chemistry laboratory.…”