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Blue-emitting small silica particles incorporating ZnSe-based nanocrystals prepared by reverse micelle method.

Ando M, Li C, Yang P, Murase N - J. Biomed. Biotechnol. (2007)

Bottom Line: It was crucially important for this solution to include Zn(2+) ions and surfactant molecules (thioglycolic acid) to preserve the spectral properties of the final silica particles.This is because these substances in the solution prevent the surface of nanocrystals from deterioration by dissolution during processing.The resultant silica particles have an emission efficiency of 16% with maintaining the photoluminescent spectral width and peak wavelength of the initial colloidal solution.

View Article: PubMed Central - PubMed

Affiliation: Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Kansai Center, Ikeda 563-8577, Osaka, Japan.

ABSTRACT
ZnSe-based nanocrystals (ca. 4-5 nm in diameter) emitting in blue region (ca. 445 nm) were incorporated in spherical small silica particles (20-40 nm in diameter) by a reverse micelle method. During the preparation, alkaline solution was used to deposit the hydrolyzed alkoxide on the surface of nanocrystals. It was crucially important for this solution to include Zn(2+) ions and surfactant molecules (thioglycolic acid) to preserve the spectral properties of the final silica particles. This is because these substances in the solution prevent the surface of nanocrystals from deterioration by dissolution during processing. The resultant silica particles have an emission efficiency of 16% with maintaining the photoluminescent spectral width and peak wavelength of the initial colloidal solution.

No MeSH data available.


Preparation procedure of silica particles incorporating ZnSe-based NCs.
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fig1: Preparation procedure of silica particles incorporating ZnSe-based NCs.

Mentions: Silicaparticles incorporating ZnSe-based NCs were prepared by the procedure depictedin Scheme 1. Instead of using Solution 1 (diluted aqueous ammonia (6.25%))described in a previous report for preparing silica particles incorporating CdTe NCs [23], we usedSolution 2 (Zn perchlorate, TGA, and NaOH solution ([Zn2+] = 0.261 mol/L, molar ratio of [Zn2+] : [TGA] = 1 : 2.43, pH~11)) for nucleation ofsilica component to the surface of the particles in Step 1-1 and Step 3. Asdescribed below, the Solution 2 was quite effective to retain the emissionefficiency of the NCs.


Blue-emitting small silica particles incorporating ZnSe-based nanocrystals prepared by reverse micelle method.

Ando M, Li C, Yang P, Murase N - J. Biomed. Biotechnol. (2007)

Preparation procedure of silica particles incorporating ZnSe-based NCs.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2266811&req=5

fig1: Preparation procedure of silica particles incorporating ZnSe-based NCs.
Mentions: Silicaparticles incorporating ZnSe-based NCs were prepared by the procedure depictedin Scheme 1. Instead of using Solution 1 (diluted aqueous ammonia (6.25%))described in a previous report for preparing silica particles incorporating CdTe NCs [23], we usedSolution 2 (Zn perchlorate, TGA, and NaOH solution ([Zn2+] = 0.261 mol/L, molar ratio of [Zn2+] : [TGA] = 1 : 2.43, pH~11)) for nucleation ofsilica component to the surface of the particles in Step 1-1 and Step 3. Asdescribed below, the Solution 2 was quite effective to retain the emissionefficiency of the NCs.

Bottom Line: It was crucially important for this solution to include Zn(2+) ions and surfactant molecules (thioglycolic acid) to preserve the spectral properties of the final silica particles.This is because these substances in the solution prevent the surface of nanocrystals from deterioration by dissolution during processing.The resultant silica particles have an emission efficiency of 16% with maintaining the photoluminescent spectral width and peak wavelength of the initial colloidal solution.

View Article: PubMed Central - PubMed

Affiliation: Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Kansai Center, Ikeda 563-8577, Osaka, Japan.

ABSTRACT
ZnSe-based nanocrystals (ca. 4-5 nm in diameter) emitting in blue region (ca. 445 nm) were incorporated in spherical small silica particles (20-40 nm in diameter) by a reverse micelle method. During the preparation, alkaline solution was used to deposit the hydrolyzed alkoxide on the surface of nanocrystals. It was crucially important for this solution to include Zn(2+) ions and surfactant molecules (thioglycolic acid) to preserve the spectral properties of the final silica particles. This is because these substances in the solution prevent the surface of nanocrystals from deterioration by dissolution during processing. The resultant silica particles have an emission efficiency of 16% with maintaining the photoluminescent spectral width and peak wavelength of the initial colloidal solution.

No MeSH data available.