Synthesis of CdTe, CdSe and CdTe/CdSe core/shell QDs from wet chemical colloidal method

Bhand, Ganesh R.; Chaure, Nandu B.

doi:10.1016/j.mssp.2017.06.033

Cited by 37 publications

(17 citation statements)

References 42 publications

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“…XPS data for the Cd, Te and Se regions (Figures 3c-3e), reveal close resemblance to the multicomponent quantum dot systems, containing heterojunctions including both CdSe and CdTe domains. [61][62][63] Hence, Cd3d 5/2 feature at 405.1 eV in Figure 3c is consistent with the Cd species interacting with Te and/or Se species [61][62][63] and lack of significant amounts of CdO x species. The Te3d 5/2 feature located at 572.5 eV in Figure 3d can be assigned to Te species that are interacting with Se and/or Cd.…”

Section: Surface Structural Analysis Via Xpssupporting

confidence: 72%

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Core‐crown Quantum Nanoplatelets with Favorable Type‐II Heterojunctions Boost Charge Separation and Photocatalytic NO Oxidation on TiO₂

et al. 2020

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Functionalization of TiO2 (P25) with oleic acid‐capped CdSe(core)/CdSeTe(crown) quantum‐well nanoplatelets (NPL) yielded remarkable activity and selectivity toward nitrate formation in photocatalytic NOx oxidation and storage (PHONOS) under both ultraviolet (UV‐A) and visible (VIS) light irradiation. In the NPL/P25 photocatalytic system, photocatalytic active sites responsible for the NO(g) photo‐oxidation and NO2 formation reside mostly on titania, while the main function of the NPL is associated with the photocatalytic conversion of the generated NO2 into the adsorbed NO3− species, significantly boosting selectivity toward NOx storage. Photocatalytic improvement in NOx oxidation and storage upon NPL functionalization of titania can also be associated with enhanced electron‐hole separation due to a favorable Type‐II heterojunction formation and photo‐induced electron transfer from the CdSeTe crown to the CdSe core of the quantum well system, where the trapped electrons in the CdSe core can later be transferred to titania. Re‐usability of NPL/P25 system was also demonstrated upon prolonged use of the photocatalyst, where NPL/P25 catalyst surpassed P25 benchmark in all tests.

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Section: Surface Structural Analysis Via Xpssupporting

confidence: 72%

“…The Te3d 5/2 feature located at 572.5 eV in Figure 3d can be assigned to Te species that are interacting with Se and/or Cd. [60][61][62][63][64] Likewise, the broad and complex Se3d signal in Figure 3e shows a Se3d 5/2 B. E. of ca. 53.9 eV in accordance with the existence of CdSe and CdSeTe species.…”

Section: Surface Structural Analysis Via Xpsmentioning

confidence: 93%

Core‐crown Quantum Nanoplatelets with Favorable Type‐II Heterojunctions Boost Charge Separation and Photocatalytic NO Oxidation on TiO₂

et al. 2020

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“…Se-Te, Se-Se, Se-S and Se-N have weak bond energy and can be used to prepare self-healing materials [ 10 ], shape memory materials [ 11 ], etc. Selenium-containing polymers are also used as adsorbents for metal elements [ 12 , 13 ] or to synthesize quantum dots (CdSe) [ 14 ] based on the interaction between metal and selenium. In addition, selenium-containing compounds are also widely used in synthesizing catalysts [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Selenium-Containing Polystyrene Microspheres and Using as Catalyst for Oxidation of Acrolein

2021

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Selenium-containing polystyrene (DSe-PS) microspheres were synthesized by soap-free emulsion polymerization using 1,2-bis(2,3,5,6-tetrafluoro-4-vinylphenyl)diselane (FVPDSe) and divinylbenzene (DVB) as crosslinking agents. The particle size of the obtained DSe-PS was characterized by a scanning electron microscope and dynamic light scattering. The results showed that the diameter of the obtained DSe-PS microspheres could be adjusted by changing the ratio of the monomer and crosslinker/water. The diselenide moiety in the obtained DSe-PS microspheres could be oxidized to seleninic acid by H2O2 which can catalyze the oxidation of acrolein. The oxidized DSe-PS microspheres exhibited higher catalytic activity and selectivity to methyl acrylate in a model oxidation of acrolein.

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“…Since Bawendi's first research in 2003 [10], for the first time, type-II CdTe/CdSe core/shell QDs were successfully prepared by using the colloidal chemical method. Afterwards, a series of type-II core/shell QDs such as CdS/ZnSe [3,6], CdTe/CdSe [11], CdTe/ZnSe [12], ZnTe/ZnSe [13], and ZnTe/CdSe [14] has been fabricated in recent years. For the above QDs, the type-II CdTe/CdSe core/shell QDs were fabricated more than other QDs, because it can be separated completely electrons and holes between the core and shell layers.…”

Section: Introductionmentioning

confidence: 99%

“…A problem associated with a practical use of CdSe/CdTe QDs is known that the CdTe shell is easily oxidized, which results in reduced chemical stability. Oxidation also reduces quantum yeild (QY) and may require incorporation of additional protection layers that isolate the Te-based material from the environment for improved PL QY [7,11].…”

Section: Introductionmentioning

confidence: 99%

Phonon Characterization, Structural and Optical Properties of Type-II CdSe/CdTe core/shell and Type-II/type-I CdSe/CdTe/ZnS core/shell/shell Quantum Dots

Hiền

2020

MaP

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The CdSe, type-II CdSe/CdTe core/shell and type-II/type-I CdSe/CdTe/ZnS core/shell/shell quantum dots (QDs) were successfully synthesized in a noncoordinating solvent. The phonon characterizations, optical properties and structures of the synthesized QDs were characterized by Raman scattering (RS) spectra, photoluminescence (PL) spectroscopy, PL-decay lifetime, absorption spectroscopy (Abs), and X-ray diffraction (XRD). The growth of QDs was monitored by using RS, which demonstrated the formation of correct of the core/shell and core/shell/shell structures. Observation results from XRD reveal that all QDs crystallize in the cubic phase with zinc-blende structure. The typical characteristics of spatially indirect recombination for type-II QDs were observed through Abs and PL spectroscopy. The ZnS shell significantly enhanced the PL quantum yeild (QY), the optical durability, the chemical stability and separating CdSe/CdTe QDs from the surroundings. The effect of excitation power on the PL properties of the CdSe core, CdSe/CdTe and CdSe/CdTe/ZnS QDs has been investigated.

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Synthesis of CdTe, CdSe and CdTe/CdSe core/shell QDs from wet chemical colloidal method

Cited by 37 publications

References 42 publications

Core‐crown Quantum Nanoplatelets with Favorable Type‐II Heterojunctions Boost Charge Separation and Photocatalytic NO Oxidation on TiO₂

Core‐crown Quantum Nanoplatelets with Favorable Type‐II Heterojunctions Boost Charge Separation and Photocatalytic NO Oxidation on TiO₂

Synthesis of Selenium-Containing Polystyrene Microspheres and Using as Catalyst for Oxidation of Acrolein

Phonon Characterization, Structural and Optical Properties of Type-II CdSe/CdTe core/shell and Type-II/type-I CdSe/CdTe/ZnS core/shell/shell Quantum Dots

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Synthesis of CdTe, CdSe and CdTe/CdSe core/shell QDs from wet chemical colloidal method

Cited by 37 publications

References 42 publications

Core‐crown Quantum Nanoplatelets with Favorable Type‐II Heterojunctions Boost Charge Separation and Photocatalytic NO Oxidation on TiO2

Core‐crown Quantum Nanoplatelets with Favorable Type‐II Heterojunctions Boost Charge Separation and Photocatalytic NO Oxidation on TiO2

Synthesis of Selenium-Containing Polystyrene Microspheres and Using as Catalyst for Oxidation of Acrolein

Phonon Characterization, Structural and Optical Properties of Type-II CdSe/CdTe core/shell and Type-II/type-I CdSe/CdTe/ZnS core/shell/shell Quantum Dots

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Core‐crown Quantum Nanoplatelets with Favorable Type‐II Heterojunctions Boost Charge Separation and Photocatalytic NO Oxidation on TiO₂

Core‐crown Quantum Nanoplatelets with Favorable Type‐II Heterojunctions Boost Charge Separation and Photocatalytic NO Oxidation on TiO₂