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Volumn 105, Issue 37, 2001, Pages 8861-8871

Synthesis and properties of biocompatible water-soluble silica-coated CdSe/ZnS semiconductor quantum dots

Author keywords

[No Author keywords available]

Indexed keywords

FLUOROPHORES;

EID: 0035922511     PISSN: 10895647     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp0105488     Document Type: Article
Times cited : (1276)

References (36)
  • 27
    • 0011300815 scopus 로고    scopus 로고
    • note
    • 28 Since this peak does not give information about the thickness of the silica shell, it is omitted in the histogram for clarity. Therefore, in Figure 5, we arbitrarily omit the particles with a height lower than the diameter of the corresponding CdSe/ZnS nanocrystals.
  • 28
    • 0011381476 scopus 로고    scopus 로고
    • note
    • The presence of residual small ZnS particles in solution is investigated in different ways. First, the absorption spectrum of CdSe/ZnS core/shell shows a sharp exciton feature in the UV range. Precursors for the ZnS shell growth ale injected in a hot pure TOPO to simulate a shell growth, but no CdSe cores are present in the solution. The absorption spectra of this test solution exhibit in the UV the same sharp exciton feature observed for our CdSe/ZnS particles. This absorption peak in the UV is also found in stock solutions for the ZnS shell growth kept at room temperature for a few days. The fraction of small particles found in solutions of silica and MPA-coated nanocrystals is therefore ascribed to small ZnS particles produced during the ZnS shell growth.
  • 34
    • 0011345308 scopus 로고    scopus 로고
    • note
    • Qualitative information about the scattering of the solution, and hence about the average size of the components in the solution, can be obtained with the fluorometer setup. The second harmonic of the excitation wavelength is scattered isotropically by the solution. The light scattered at 90° is measured with the fluorometer detector. CdSe/ZnS nanocrystals in methanol have a scattered light intensity almost 100 times larger than in toluene. This effect cannot be ascribed to the difference in the refractive index of methanol and toluene. CdSe/ZnS nanocrystals in methanol primed with MPS do not exhibit any scattering.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.