Preparation of silica encapsulated CdSe quantum dots in aqueous solution with the improved optical properties

Zhou, Xingping; Kobayashi, Yoshio; Romanyuk, V. R.; Ochuchi, Noriaki; Takeda, Motohiro; Tsunekawa, Shin; Kasuya, A.

doi:10.1016/j.apsusc.2004.08.022

Cited by 47 publications

(24 citation statements)

References 27 publications

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“…The interest in core shell nanoparticles consisting of a nanometric magnetic core coated with an insulating matrix such as silica has grown considerably in recent years [1][2][3]. Many synthetic approaches have been employed to prepare core shell nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Preparation of core shell particles consisting of cobalt ferrite and silica by sol–gel process

Zhang

Dong

Sui

et al. 2006

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Preparation of core shell particles consisting of cobalt ferrite and silica by sol–gel process

Zhang

Dong

Sui

et al. 2006

Journal of Alloys and Compounds

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“…They reported that, via increasing the temperature, the particle size decreased and the intensity of ZnO peaks increased too. We can detect this fact in the pattern of ZnO-Co(OH) 2 nano-composites [44] . The SEM images of the samples are shown in Fig.…”

Section: Synthesis Before Calcinationmentioning

confidence: 97%

Coupled Semiconductor Metal Oxide Nanocomposites: Types, Synthesis Conditions and Properties

Vaezi¹

2011

Advances in Composite Materials for Medicine and Nanotechnology

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“…[25][26][27][28][29][30][31] That means, for the current case, the aggregation formation model of the (25 C) pK 1 = 1.99 pK 1 = 1.89 pK 1 = 3.46 pK 1 = 3.04 pK 1 = 3.13 pK 2 = 2.67 pK 2 = 2.49 pK 2 = 5.05 pK 2 = 4.37 pK 2 = 4.76 pK 3 = 6.16 pK 3 = 9.73 pK 3 = 6.40 pK 4 = 10.26 NaYF 4 nanoparticles in relatively concentrated systems are reconfirmed from the other side, since chelators with high complexing constants did not lead to large particles. This is in good agreement with Shun's work.…”

Section: Fundamental Properties Of the Chelators And Their Influencesmentioning

confidence: 99%

Formation and Luminescence of Sodium Rare Earth Fluoride Nanocrystals in the Presence of Chelators

Zhou¹,

Wang²,

Li³

et al. 2010

j nanosci nanotechnol

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The single crystal structure of sodium yttrium fluoride (NaYF4) nanoparticles formed mainly by aggregation in aqueous phase was first confirmed by high resolution transmission electron microscope (HRTEM). Then, effects of reactant concentrations and pH on the formation of NaYF4 nanocrystals were investigated and described in the presence of sodium citrate (Na-citrate). The results showed that the non-aggregation formation of NaYF4 was dominant under a low concentration range of reactants, and the aggregation formation was dominant under a high concentration range of reactants. For comparison, NaYF4 nanocrystals were also synthesized by co-precipitation in the presence of various other chelators, not only amino-carboxyl (H2N-C) types involving (Na-EDTA) and sodium nitrilotriacetate (Na-NTA) but also hydroxyl-carboxyl (HO-C) types including sodium citrate (Na-citrate), sodium malate (Na-malate), and potassium sodium tartrate (K, Na-tartate). All the chelators showed a similar influence on the particle formation. However, the size of the final product was different corresponding to the different chelators. An upconversion fluorescent material, cubic NaYF4 nanocrystal co-doped with ytterbium and erbium with diameter about 10 nm was successfully achieved at room temperature. Under 980 nm laser excitation, the red emissions at 652 and 679 nm were much stronger than green emissions at 520 and 541 nm. Additionally, effects of concentrations of the different chelators on the fluorescent properties of the formed NaYF4:Yb, Er nanocrystals were also investigated. Different chelators affected the fluorescent properties differently, according to their respective physical and chemical properties.

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Preparation of silica encapsulated CdSe quantum dots in aqueous solution with the improved optical properties

Cited by 47 publications

References 27 publications

Preparation of core shell particles consisting of cobalt ferrite and silica by sol–gel process

Preparation of core shell particles consisting of cobalt ferrite and silica by sol–gel process

Coupled Semiconductor Metal Oxide Nanocomposites: Types, Synthesis Conditions and Properties

Formation and Luminescence of Sodium Rare Earth Fluoride Nanocrystals in the Presence of Chelators

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