Microwave Synthesis of Water‐Dispersed CdTe/CdS/ZnS Core‐Shell‐Shell Quantum Dots with Excellent Photostability and Biocompatibility

He, Yao; Lu, Hao‐Ting; Sai, Liman; Su, Yuanyuan; Hu, Mei; Fan, Chunhai; Huang, Wei; Wang, Lianhui

doi:10.1002/adma.200701166

Cited by 263 publications

(144 citation statements)

References 30 publications

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“…This hints at that the shell crystal quality is not sufficient to fully passivate the cores and defect-induced nonradiative channels open up at the same time to prevent QY enhancement. Shell formation has previously been reported also using a microwave-assisted synthesis at relatively high temperatures, giving rise to increased QY [30]. However, this is possible at only high temperatures.…”

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confidence: 92%

High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

et al. 2015

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We report high-efficiency CdTe/CdS core/shell nanocrystals synthesized in water by epitaxially growing CdS shells on aqueous CdTe cores at room temperature, enabled by the controlled release of S species under low-intensity ultraviolet (UV) light illumination. The resulting photo-induced dissociation of S2O32− ions conveniently triggers the formation of critical two-dimensional CdS epitaxy on the CdTe surface at room temperature, as opposed to initiating the growth of individual CdS core-only nanocrystals. This controlled colloidal hetero-epitaxy leads to a substantial increase in the photoluminescence (PL) quantum yield (QY) of the shelled nanocrystals in water (reaching 64%). With a systematic set of studies, the maximum PL QY is found to be almost independent of the illuminating UV intensity, while the shell formation kinetics required for reaching the maximum QY linearly depends on the illuminating UV intensity. A stability study of the QD films in air at various temperatures shows highly improved thermal stability of the shelled QDs (up to 120 °C in ambient air). These results indicate that the proposed aqueous CdTe/CdS core/shell nanocrystals hold great promise for applications requiring efficiency and stability. [Figure not available: see fulltext.] © 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg

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confidence: 92%

High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

et al. 2015

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“…Although highly stable water-soluble QDs can be prepared in this way, the size of QDs is relatively large. Recently, the water-dispersed QDs directly synthesized in the aqueous phase are of great interest and have been widely investigated [2,3]. In order to improve the photoluminescence quantum yield and stability, CdTe/CdS and CdTe/CdS/ ZnS core-shell composite QDs have been successfully prepared in an aqueous phase assisted by microwave irradiation [2], which exhibit excellent photostability and favorable biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the water-dispersed QDs directly synthesized in the aqueous phase are of great interest and have been widely investigated [2,3]. In order to improve the photoluminescence quantum yield and stability, CdTe/CdS and CdTe/CdS/ ZnS core-shell composite QDs have been successfully prepared in an aqueous phase assisted by microwave irradiation [2], which exhibit excellent photostability and favorable biocompatibility. In addition, the broad absorption and narrow emission spectra of the QDs make them excellent donors in fluorescence resonance energy transfer (FRET)-based sensors, because these fluorescence characteristics allow the selection of a wide range of excitation wavelengths to minimize the background due to direct excitation of the acceptor [4,5].…”

Section: Introductionmentioning

confidence: 99%

Study on Fluorescence Characteristic of a Complex Probe οf CdSe Quantum Dots Coupling with Thiazole Orange

et al. 2010

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CdSe quantum dots were synthesized using thioglycolic acid as stabilizer in aqueous solution under N 2 . The UV-vis spectrometry and fluorescence spectra indicate that the bimodal quantum dots were formed and the optical band gaps are about 650 nm and 750 nm, respectively. The quantum dots coated with TO were prepared in room temperature, and the fluorescence characteristic was studied. The result showed that the peak shift of quantum dots fluorescence spectra can mainly be due to the change of the capping layer, resulting in the confinement energy change. This is vital for the investigating on of the forming process and mechanisms of the combination of thiazole orange dye and quantum dots.

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“…QDs possess superior optical properties, such as high photoluminescence quantum yield (PLQY), broad absorption coupled with narrow emission, and strong photostability [76]. Consequently, several kinds of QDs have been fabricated and utilized for applications including biosensing, bioimaging and disease diagnosis [77].…”

Section: Semiconductor Quantum Dotsmentioning

confidence: 99%

Autophagy as new emerging cellular effect of nanomaterials

et al. 2013

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The biosafety issue of nanoscale materials is getting more and more attention with their increasing manufacture and application. In the research of cellular effects and underlying mechanisms related to toxicity of nanomaterials, most emphasis were placed on processes such as apoptosis, metabolic inhibition and oxidative stress. Recent evidence suggests that autophagy is part of the biological effects by nanomaterials and various kinds of nanomaterials are capable of disturbing the autophagic process. This review will highlight the importance of autophagy as an emerging mechanism of nanomaterial toxicity and the implication in the therapy of autophagy-related diseases. We summarize current research status of interaction between nanomaterials and autophagic pathways. It is of note that nanomaterials can either induce or block autophagy, which result in similar phenotype but completely different biological consequence. It is therefore important to perform comprehensive analysis of the whole autophagic flux in the future research. Nanomaterials refer to materials with the size range between 1 and 100 nanometers in one or more dimensions [1]. Due to their superior physicochemical properties, such as ultra small size, increased ratio of surface area to volume, multiple options for modification and relatively good biocompatibilities, application of nanomaterials in research as well as in industry becomes more and more common. It is predicted that the total amount of nanomaterials' production will increase up to 58000 tons by 2020. Particularly, the utilization of nanomaterials in biomedical research as biosensors, drug-carriers, or imaging agents was extensively studied [2][3][4]. Large scaled preparation and application of nanomaterials increase their possibilities to be exposed to human beings or enter the environment [5][6][7]. Therefore the impact of nanomaterials on environment and human health has attracted high attention. Related studies were carried out on the biological effect of various kinds of nanomaterials both in vitro and in vivo [8]. To date, reported physiological changes of a cell or an organism that exposed to nanomaterials include: reactive oxygen species (ROS)-related pathological responses (such as damaged membrane, mitochondrial damage and necrosis), apoptosis, inflammation and altered differentiation patterns, etc [9][10][11][12]. Recently, autophagy as an essential cellular process and a novel biological effect of nanomaterials on eukaryotes, has received much attention. Many nanomaterials were reported to be able to change the basal level of autophagy [13,14]. Autophagy can crosstalk with other cellular process, such as apoptosis and necrosis, and therefore is an important part of the cellular effect of nanomaterials [15,16]. Moreover, nanomaterials-induced autophagy showed potential for the treatment of certain diseases including neurodegenerative diseases and cancer [13,17]. Hence, in this review we summarize the current research on the effect of various kinds of nanomaterials on autophagy. ...

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Microwave Synthesis of Water‐Dispersed CdTe/CdS/ZnS Core‐Shell‐Shell Quantum Dots with Excellent Photostability and Biocompatibility

Cited by 263 publications

References 30 publications

High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

Study on Fluorescence Characteristic of a Complex Probe οf CdSe Quantum Dots Coupling with Thiazole Orange

Autophagy as new emerging cellular effect of nanomaterials

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