메뉴 건너뛰기




Volumn 16, Issue 23-24, 2004, Pages 2092-2097

Incorporation of luminescent nanocrystals into monodisperse core-shell silica microspheres

Author keywords

[No Author keywords available]

Indexed keywords

ETHANOL; MORPHOLOGY; NUCLEATION; OPTICAL MICROSCOPY; SCANNING ELECTRON MICROSCOPY; SILICA; SYNTHESIS (CHEMICAL); TRANSMISSION ELECTRON MICROSCOPY; VISUALIZATION; WAVELENGTH DISPERSIVE SPECTROSCOPY;

EID: 11344278587     PISSN: 09359648     EISSN: None     Source Type: Journal    
DOI: 10.1002/adma.200400237     Document Type: Article
Times cited : (227)

References (33)
  • 17
    • 11344275123 scopus 로고    scopus 로고
    • note
    • The diameters of a large number of spheres (typically - 200 spheres) were obtained from scanned TEM images processed using ImageJ and tabulated. The size distribution, defined as the standard deviation divided by the mean sphere diameter, was subsequently evaluated as such for all samples reported.
  • 18
    • 11344279470 scopus 로고    scopus 로고
    • Version 1.30, July 2003. Wayne Rasband. National Institutes of Health
    • Version 1.30, July 2003. Wayne Rasband. National Institutes of Health.
  • 19
    • 0003484845 scopus 로고
    • Academic, Boston, MA
    • The shell thickness cannot be obtained by simply taking the difference in mean diameters between the coated and bare spheres because shrinking of the cores can occur as a result of condensation of unreacted Si-OH groups when the spheres are re-dispersed in a basic solution for coating. See C. J. Brinker, G. W. Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, Academic, Boston, MA 1990.
    • (1990) Sol-gel Science: the Physics and Chemistry of Sol-gel Processing
    • Brinker, C.J.1    Scherer, G.W.2
  • 21
    • 11344265860 scopus 로고    scopus 로고
    • note
    • The quantum yield was determined as follows: the optical densities of the index matched coated spheres in a toluene/ethanol mixture and an appropriate reference dye in methanol were closely matched at the wavelength of excitation. To ensure that no reabsorption of the dye emission occurs, the optical densities were always maintained at a value below 0.1 at the excitation wavelength. The photoluminescence spectra of both the sample of coated spheres and the reference dye were acquired using a SPEX Fluorolog 1680 spectrometer. Comparison of their corresponding integrated emission allowed the quantum yield of the sample to be determined.
  • 22
    • 11344252098 scopus 로고    scopus 로고
    • note
    • Although the quantum yields of as-synthesized core-shell CdSe/ZnS NCs used were as high as 38%. subsequent loss of the original surface ligands due to cap-exchange with AP and APS can lead to diminished quantum yields. Furthermore, the decline in the quantum yield due to processing is very dependent on the quality and thickness of the ZnS shell on the NCs, which can vary from sample to sample.
  • 23
    • 11344283747 scopus 로고    scopus 로고
    • note
    • The standard deviation is more significant than the absolute value of the ratio due to the curvature of the microsphere, which may introduce inherent systematic error into the WDS measurement.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.