Synthesis of Cd-free water-soluble ZnSe1−xTex nanocrystals with high luminescence in the blue region

Li, Chunliang; Nishikawa, Kazuhiro; Ando, Masanori; Enomoto, Hikoe; Murase, Norio

doi:10.1016/j.jcis.2008.02.009

Cited by 37 publications

(44 citation statements)

References 44 publications

(54 reference statements)

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“…While many separation methods for NPs are proposed, from traditional separation science (filtration, chromatography, extraction) to nanoscale specific phenomena (field-flow fractionation, size selective precipitation), the continuous operation methods or techniques for the industrial scale are still sought after and are the main challenge for future research on size-selective separation of NPs. (Vossmeyer T. et al, 1994) ZnS cysteine water ethanol (Bae W. and Mehra R.K., 1998) CdTe 1-TG, TGA, 2-ME water 2-propanol (Gaponik N. et al, 2002) ZnSe x Te 1-x TGA water 2-propanol (Li C. et al, 2008) ZnS:Mn 1-TG water 2-propanol (Komada S. et al, 2012, Segets D. et al, 2013 Si octadecene chloroform methanol (Li X. et al, 2004) Si 1-octene toluene methanol (Liu S.M. et al, 2006) Si allylbenzene toluene methanol (Mastronardi M.L.…”

Section: Discussionmentioning

confidence: 99%

Size-Selective Separation Techniques for Nanoparticles in Liquid

Mori

2015

KONA

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The many characteristics of nanoparticles (NPs) depend on their size and size distribution. When novel functions of NPs are attempted, it is necessary to monodisperse or nearly monodisperse NPs. Many synthesis methods have been proposed from solution-based chemistry to satisfy this demand. Despite such special techniques to prepare NPs, it is often the case that an additional classification procedure is needed to a certain extent to obtain monodispersed NPs, similar to other general precipitation methods used in NP preparation. Additionally, NPs must be purified post-synthesis to remove by-products. Hence, size-selective separation as post-synthesis operation is expected to become increasingly important. In this review, some recent developments of sizeselective separation methods for NPs based on using external fields, filtration, and the stability of the colloid system are highlighted.

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Section: Discussionmentioning

confidence: 99%

Size-Selective Separation Techniques for Nanoparticles in Liquid

Mori

2015

KONA

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“…Other groups have reported other methods for the synthesis of ZnSe. These methods are mostly expensive, time consuming and are not environmentally friendly . The photochemical method is a room temperature method for the synthesis of QDs .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnSe and ZnSe:Cu quantum dots by a room temperature photochemical (UV‐assisted) approach using Na₂SeO₃ as Se source and investigating optical properties

2016

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In this study, ZnSe and ZnSe:Cu quantum dots (QDs) were synthesized using Na SeO as the Se source by a rapid and room temperature photochemical (UV-assisted) approach. Thioglycolic acid (TGA) was employed as the capping agent and UV illumination activated the chemical reactions. Synthesized QDs were successfully characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL) and UV-visible (UV-vis) spectroscopy, Fourier transform-infrared (FT-IR), and energy dispersive X-ray spectroscopy (EDX). XRD analysis demonstrated the cubic zinc blend phase QDs. TEM images indicated that round-shaped particles were formed, most of which had a diameter of about 4 nm. The band gap of the ZnSe QDs was higher than that for ZnSe in bulk. PL spectra indicated an emission with three peaks related to the excitonic, surface trap states and deep level (DL) states. The band gap and QD emission were tunable only by UV illumination time during synthesis. ZnSe:Cu showed green emission due to transition of electrons from the Conduction band (CB) or surface trap states to the T acceptor levels of Cu . The emission was increased by increasing the Cu ion concentration, such that the optimal value of PL intensity was obtained for the nominal mole ratio of Cu:Zn 1.5%.

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“…2). 15,46 Novel approaches to the aqueous synthesis of thiol-capped core/shell NCs (with both core and shell being II-VI semiconductor materials) resulted in strongly emitting CdTe/CdS NCs synthesized in presence of tiopronin and GSH, 16 CdTe/ZnTe NCs with cysteine capping shell optimized for targeted bioimaging, 47 CdTe/CdS/ZnS core-shell-shell NCs designed to possess relatively low cytotoxicity, 48 type II CdTe/CdS NCs stabilized by MPA, 49 and CdSe/Zn x Cd 1Àx S NCs synthesized with the assistance of GSH. 50 Although successful shape control approaches are not yet established for aqueous synthesis of thiol-capped NCs, the following examples show the progress in this direction.…”

Section: Introductionmentioning

confidence: 99%

Thiol-capped CdTe nanocrystals: progress and perspectives of the related research fields

Gaponik

Rogach

2010

Phys. Chem. Chem. Phys.

116

106

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This article analyzes and summarizes recent developments and newly emerging research fields related to thiol-capped CdTe nanocrystals, the most successful example of the colloidal quantum dots directly synthesized in aqueous solution. Progress in the synthesis and design of novel materials and functionalities, sophisticated assemblies of thiol-capped nanocrystals, development and validation of analytical and spectroscopic methods relying on thiol-capped CdTe nanocrystals as a model system, and, finally, applications of thiol-capped semiconductor nanocrystals in various fields ranging from light harvesting and energy transfer to biotechnology are addressed.

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Synthesis of Cd-free water-soluble ZnSe1−xTex nanocrystals with high luminescence in the blue region

Cited by 37 publications

References 44 publications

Size-Selective Separation Techniques for Nanoparticles in Liquid

Size-Selective Separation Techniques for Nanoparticles in Liquid

Synthesis of ZnSe and ZnSe:Cu quantum dots by a room temperature photochemical (UV‐assisted) approach using Na₂SeO₃ as Se source and investigating optical properties

Thiol-capped CdTe nanocrystals: progress and perspectives of the related research fields

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Synthesis of Cd-free water-soluble ZnSe1−xTex nanocrystals with high luminescence in the blue region

Cited by 37 publications

References 44 publications

Size-Selective Separation Techniques for Nanoparticles in Liquid

Size-Selective Separation Techniques for Nanoparticles in Liquid

Synthesis of ZnSe and ZnSe:Cu quantum dots by a room temperature photochemical (UV‐assisted) approach using Na2SeO3 as Se source and investigating optical properties

Thiol-capped CdTe nanocrystals: progress and perspectives of the related research fields

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Synthesis of ZnSe and ZnSe:Cu quantum dots by a room temperature photochemical (UV‐assisted) approach using Na₂SeO₃ as Se source and investigating optical properties