Selective synthesis of CdTe and high luminescence CdTe/CdS quantum dots: The effect of ligands

Liu, Yingfan; Yu, Junsheng

doi:10.1016/j.jcis.2009.01.008

Cited by 132 publications

(83 citation statements)

References 46 publications

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“…The spectrum of TGH-capped CdSe QDs also had absorption bands around 1500 and 900 cm -1 , ascribed to O-H bending and C-O stretching. 50,51 The FT-IR assignments agreed with data recorded for similar systems such as watersoluble CdTe, which means that CdSe and CdTe QDs interact with thiol surface ligands in aqueous medium in much the same way.…”

Section: Cdse Qdssupporting

confidence: 75%

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

et al. 2016

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In this work a colloidal approach to synthesize water-soluble CdSe quantum dots (QDs) bearing a surface ligand, such as thioglycolic acid (TGA), 3-mercaptopropionic acid (MPA), glutathione (GSH), or thioglycerol (TGH) was applied. The synthesized material was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), UV-visible spectroscopy (UV-Vis), and fluorescence spectroscopy (PL). Additionally, a comparative study of the optical properties of different CdSe QDs was performed, demonstrating how the surface ligand affected crystal growth. The particles sizes were calculated from a polynomial function that correlates the particle size with the maximum fluorescence position. Curve resolution methods (EFA and MCR-ALS) were employed to decompose a series of fluorescence spectra to investigate the CdSe QDs size distribution and determine the number of fraction with different particle size. The results for the MPA-capped CdSe sample showed only two main fraction with different particle sizes with maximum emission at 642 and 686 nm. The calculated diameters from these maximum emission were, respectively, 2.74 and 3.05 nm.

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Section: Cdse Qdssupporting

confidence: 75%

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

et al. 2016

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“…In addition, the same QDs also find application in biomedical labeling, imaging, sensing and diagnostics by utilizing their fluorescence properties [5,6]. Among various semiconductor QDs known till date, Cadmium telluride (CdTe) QDs is one of most significant semiconductor nanocrystals which are largely used in solar photovoltaic cell, opto-electronic devices and in vivo biomedical detection fluorescent tags in biology [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…This can be further classified as aqueous and non-aqueous solvent synthesis routes. Aqueous route is advantages than non-aqueous (organometallic) as it can be performed in low temperature, less toxic and bio-compatible [5,6,[9][10][11][12][13]. The aqueous CdTe synthesis mainly comprises two steps, first preparation of Te precursor and followed by growth of CdTe QDs.…”

Section: Introductionmentioning

confidence: 99%

“…The aqueous CdTe synthesis mainly comprises two steps, first preparation of Te precursor and followed by growth of CdTe QDs. Te Precursor is prepared by reducing elemental Te in N 2 /inert atmosphere to prevent oxidation of Te [5,6], which increases the cost of reaction. To prevent this, researchers are trying to synthesis CdTe QDs using precursors like Al 2 Te 3 [13,14], Te (as electrode) [9,10], Na 2 TeO 3 [11,12], etc.…”

Section: Introductionmentioning

confidence: 99%

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

Kumar

Mahesh

2016

Journal of Luminescence

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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.

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“…C-CPA contains a side-chain fluorophore which makes the polymer displaying certain photoluminescence property and the photoluminescence intensity related on the contents of 2-(dimethylamino) ethyl methacrylate (DM) in the main chain of C-CPA. TGA-capped CdTe QDs is a water-soluble semiconductor nanocrystal with good photoluminescence property and the particle size and florescence emission peak position of CdTe QDs can be adjusted by controlling the synthesis reaction time of the CdTe QDs 20 . On the other side, C-CPA carries positive charges when quaternized and TGA-capped CdTe QDs carries negative charges on its surface.…”

Section: Introductionmentioning

confidence: 99%

Study on the Fluorescence Characteristics of CdTe and Charged Coumarin-Contained Polymer Blending System

Wang¹,

Li²,

Chen³

et al. 2013

Asian J. Chem.

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In this paper, a series of positively charged coumarin-contained polymer (C-CPA) were synthesized and a negatively charged CdTe quantum dots (CdTe QDs) protected by thioglycolic acid (TGA) was prepared. C-CPA and CdTe QDs were blended in mixed solution to build a blending system. The photoluminescent properties of both C-CPA and CdTe QDs were studied and the influence of the solvent on the size of CdTe QDs was studied as well. By controlling the proportions of the two mixtures, some regularly phenomena were found. As the proportion of CdTe QDs rising in the mixture, the fluorescence intensity of C-CPA declined; as the proportion of C-CPA rising, the fluorescence intensity of CdTe QDs rose significantly. These phenomena followed the fluorescence resonance energy transfer theory (FRET). The electrostatic force between the two mixtures caused the interaction between them. The study confirmed that an energy donor-acceptor pair was formed in this blending system.

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Selective synthesis of CdTe and high luminescence CdTe/CdS quantum dots: The effect of ligands

Cited by 132 publications

References 46 publications

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

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

Study on the Fluorescence Characteristics of CdTe and Charged Coumarin-Contained Polymer Blending System

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