Highly luminescence CdTe/ZnSe core–shell QDs; synthesis by a simple low temperature approach

Farahmandzadeh, Farzad; Molaei, M.; Karimipour, Masoud; Shamsi, Alireza

doi:10.1007/s10854-020-03784-y

Cited by 14 publications

(6 citation statements)

References 37 publications

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“…The XRD pattern of the CdTe/ZnSe core/shell QDs has two main peaks at 24.98 and 33.55 that correspond to (111) and (200) plane of cubic phase of CdTe/ZnSe. [12] The XRD pattern of the CdTe/ZnSe core/shell QDs after gamma irradiation also indicate the same peaks, indicating crystalline stability of CdTe/ZnSe core/shell QDs after gamma irradiation. In the XRD pattern after gamma irradiation a slight shift to higher angles has occurred which can be attributed to more growth of the ZnSe shell after 20 kGy gamma irradiation and therefore decreasing the lattice parameter or growth of ultrathin ZnS shell top of ZnSe [27] due to thiol molecules.…”

Section: Structural Propertiesmentioning

confidence: 76%

“…[24] A photochemical method was applied to grow a ZnSe shell around CdTe QDs. [12] This synthesis approach has been selected because, this is a simple, low temperature and fast approach and in addition to that, CdTe/ZnSe synthesized QDs are high luminescence QDs which is an important factor. Furthermore, the procedure does not require equipment leading to be appropriate for mass production to commercial applications.…”

Section: Synthesis Of Cdte/znse Core/shell Qdsmentioning

confidence: 99%

“…Also, in another work, they synthesized CdTe/ ZnSe QDs by ultrafast microwave method with quantum yield about 56%. [12,13] Li et al synthesized CdTe/ZnSe core/shell QDs with a refluxing method and reported an increase of biocompatibility and stability of CdTe/ZnSe in comparison of CdTe QDs. [14] Moulick et al synthesized CdTe/ZnSe core/shell structure with a microwave method and used them for DNA detection [15] and Fu et al synthesized CdTe/ZnSe by a hot injection approach with 44% quantum efficiency.…”

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confidence: 99%

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Effect of concentration and shell thickness on the optical behavior of aqueous CdTe/ZnSe core/shell quantum dots (QDs) exposed to ionizing radiation

et al. 2022

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In this work CdTe/ZnSe core/shell quantum dots (QDs) were synthesized via a simple, rapid and room temperature photochemical approach. Optical properties of aqueous prepared CdTe/ZnSe QDs were studied systematically under gamma irradiation with dose range of 0 Gy to 20 kGy. The obtained results showed a regular red shift behavior versus gamma irradiation dose, in photoluminescence peak and absorption edge of the CdTe/ZnSe QDs. Structural properties of CdTe/ZnSe QDs before and after gamma irradiation were characterized by means of X-ray diffraction (XRD), Raman and Fourier-transform infrared (FT-IR) analyses. The obtained results showed that the crystalline structure of CdTe/ZnSe core/shell QDs did not change after gamma irradiation. Concentration and shell thickness as two important factors on the sensitivity of CdTe/ZnSe QDs in front of gamma irradiation have been investigated. Based on this study, CdTe/ZnSe QDs are suggested as good candidates for gamma dosimeter.

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Section: Structural Propertiesmentioning

confidence: 76%

Section: Synthesis Of Cdte/znse Core/shell Qdsmentioning

confidence: 99%

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confidence: 99%

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Effect of concentration and shell thickness on the optical behavior of aqueous CdTe/ZnSe core/shell quantum dots (QDs) exposed to ionizing radiation

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“…[ 9,10 ] The growth of inorganic shell and the formation of core–shell structure is the best solution to address both issues; [ 11,12 ] therefore, introducing new and simple approaches for the synthesis of core–shell high luminescence QDs is an interesting research topic. [ 13,14 ]…”

Section: Introductionmentioning

confidence: 99%

CdTe/CdS Core–Shell Quantum Dots: Synthesis and Applications as a Heavy Metal Ion's Fluorescence Sensor and Photocatalyst for Photodegradation of Organic Dyes

pourtakallo

Molaei

Khanzadeh

2023

Physica Status Solidi (a)

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Herein, a simple method for the growth of the CdS shell around CdTe QDs and the formation of the CdTe/CdS core–shell structure is proposed. The synthesized QDs are characterized using Raman, Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL), and UV–vis analyses. XRD patterns confirm the formation of a core–shell‐type structure and particle sizes, lattice strain (ε), and displacement density (δ) are calculated using Williamson–Hall (W–H) and Williamson–Smallman (W–S) approaches. Obtained results show that the CdTe/CdS QDs are spherical with an average crystal size about 5.41 nm. In this work, derivation of absorption spectrum fitting (DASF) is used for the determination of the optical bandgap of the prepared QDs. Prepared CdTe/CdS QDs are applied for the detection of the heavy metal ions and photodegradation of the different organic dyes in aqueous media. The prepared QDs show good performance for the detection of mercury ions (Hg2+) in water with superior selectivity and for photodegradation of the methylene orange (MO) under UV light. The comparison of the obtained results for CdTe/CdS with bare CdTe QDs shows that the core–shell CdTe/CdS QDs have higher sensitivity and enhanced photocatalyst properties compared to the CdTe QDs.

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“…To the first issue, CdTe QDs are usually passivated with an inorganic shell to increase the stability toward environmental oxidation and a durable capping layer which is normally composed of thiolate or bidentate ligands. The inorganic shell could be a thin CdS layer that is grown by post-illumination deposition or thermal decomposition [11][12][13][14] or be CdS/ZnS multiple layers [15,16]. To the second issue, CBE can be varied either by tuning the QDs size thanking to the quantum confinement effect or employing a capping ligand having different hybridization with the frontier orbital of QDs [17,18].…”

Section: Introduction *mentioning

confidence: 99%

Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion

Nhàn¹,

Duc²,

Dũng³

et al. 2022

NST

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Water-soluble CdTe quantum dots (QDs) have been utilized as photoluminescence probes for the detection of metal ions such as Pb2+, Hg2+, Cd2+, etc. We initially developed highly photoluminescence (PL) Zn-doped CdTe for toxic ions detection. A study on the changes of optical properties of Zn-doped CdTe and CdTe QDs when exposed to Pb2+ suggested that Pb2+ could act as a surface passivating agent to reduce Te2- dangling bonds while Zn2+ dopant stabilizes the QDs surface against ambient oxidation. The results demonstrated herein provide useful understandings of the interactions between water-soluble QDs and metal ions. These results suggest further applications of QDs in sensing metal ions.

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Highly luminescence CdTe/ZnSe core–shell QDs; synthesis by a simple low temperature approach

Cited by 14 publications

References 37 publications

Effect of concentration and shell thickness on the optical behavior of aqueous CdTe/ZnSe core/shell quantum dots (QDs) exposed to ionizing radiation

Effect of concentration and shell thickness on the optical behavior of aqueous CdTe/ZnSe core/shell quantum dots (QDs) exposed to ionizing radiation

CdTe/CdS Core–Shell Quantum Dots: Synthesis and Applications as a Heavy Metal Ion's Fluorescence Sensor and Photocatalyst for Photodegradation of Organic Dyes

Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion

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