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Volumn 2, Issue 7, 2002, Pages 681-685

Size Tunable Visible Luminescence from Individual Organic Monolayer Stabilized Silicon Nanocrystal Quantum Dots

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EID: 0003281266     PISSN: 15306984     EISSN: None     Source Type: Journal    
DOI: 10.1021/nl025538c     Document Type: Article
Times cited : (317)

References (25)
  • 7
    • 0027688144 scopus 로고
    • Wilson, W. L.; Szajowski, P. F.; Brus, L. E. Science 1993, 262, 1242. Brus, L. E.; Szajowski, P. F.; Wilson, W. L.; Harris, T. D.; Schuppler, S.; Citrin, P. H. J. Am. Chem. Soc. 1995, 117, 2915.
    • (1993) Science , vol.262 , pp. 1242
    • Wilson, W.L.1    Szajowski, P.F.2    Brus, L.E.3
  • 9
    • 0347476985 scopus 로고    scopus 로고
    • For example, if the lifetime of the emitting state was ∼500 μs, the fastest excitation frequency would be ∼2 kHz, which rivals the background counts on the detector at reasonable excitation intensity. Emission from a collection of several particles would be observable, but the size-dependent PL would broaden the measured spectra as observed in ref 9
    • For example, if the lifetime of the emitting state was ∼500 μs, the fastest excitation frequency would be ∼2 kHz, which rivals the background counts on the detector at reasonable excitation intensity. Emission from a collection of several particles would be observable, but the size-dependent PL would broaden the measured spectra as observed in ref 9.
  • 11
    • 0348106967 scopus 로고    scopus 로고
    • Si nanocrystals were synthesized via thermal degradation of a silicon precursor in supercritical hexane. A 1.5 mL portion of a stock Si precursor solution (250 mM diphenylsilane and 25 mM octanethiol in hexane) was loaded into a 10 mL cylindrical titanium reactor in a nitrogen glovebox. All chemicals used for the synthesis were degassed to remove oxygen and stored in a nitrogen-rich environment. The titanium reactor was sealed, removed from the glovebox, wrapped with high temperature heating tape, and heated to 500 °C. The reaction proceeded at 500 °C and 83 bar for 30 min. The reactor was then allowed to cool to room temperature over the course of approximately 2.5 h. The product was extracted with chloroform and precipitated in excess ethanol to remove reaction byproducts. The nanocrystals could be redispersed in a variey of organic solvents for further manipulation for later analysis
    • Si nanocrystals were synthesized via thermal degradation of a silicon precursor in supercritical hexane. A 1.5 mL portion of a stock Si precursor solution (250 mM diphenylsilane and 25 mM octanethiol in hexane) was loaded into a 10 mL cylindrical titanium reactor in a nitrogen glovebox. All chemicals used for the synthesis were degassed to remove oxygen and stored in a nitrogen-rich environment. The titanium reactor was sealed, removed from the glovebox, wrapped with high temperature heating tape, and heated to 500 °C. The reaction proceeded at 500 °C and 83 bar for 30 min. The reactor was then allowed to cool to room temperature over the course of approximately 2.5 h. The product was extracted with chloroform and precipitated in excess ethanol to remove reaction byproducts. The nanocrystals could be redispersed in a variey of organic solvents for further manipulation for later analysis.
  • 12
    • 0348106969 scopus 로고    scopus 로고
    • The optical properties of the nanocrystals do not appear to change over time after exposure to air; however, oxygen and water may indeed affect the optical properties of the material and oxygen- and water-free optical experiments remain to be conducted
    • The optical properties of the nanocrystals do not appear to change over time after exposure to air; however, oxygen and water may indeed affect the optical properties of the material and oxygen-and water-free optical experiments remain to be conducted.
  • 13
    • 0347476951 scopus 로고    scopus 로고
    • + laser was focused by an oil immersion objective (1.2 NA) to a diffraction-limited spot on the sample coverslip. A computer-controlled piezo stage scanned the sample. The sample photoluminescence was collected through the same objective, filtered with a holographic notch filter to remove residual excitation light, and detected by an avalanche photodiode (APD). Alternatively, the emission spectra were obtained by directing the light output to a polychromator equipped with an intensified charged-coupled device (ICCD) to record the intensity as a function of wavelength
    • + laser was focused by an oil immersion objective (1.2 NA) to a diffraction-limited spot on the sample coverslip. A computer-controlled piezo stage scanned the sample. The sample photoluminescence was collected through the same objective, filtered with a holographic notch filter to remove residual excitation light, and detected by an avalanche photodiode (APD). Alternatively, the emission spectra were obtained by directing the light output to a polychromator equipped with an intensified charged-coupled device (ICCD) to record the intensity as a function of wavelength.
  • 20
    • 0347476952 scopus 로고    scopus 로고
    • note
    • 2.
  • 22
    • 0346215745 scopus 로고    scopus 로고
    • The fluorescence quantum yield of Si nanocrystals dispersed in chloroform was measured relative to Rhodamine 6G in ethanol (QY = 95%) using 488 nm excitation on a fluorometer (SPEX) in a right-angle geometry. The absorbance of both Si suspension and R6G solution at 488 nm were adjusted to ∼0.06. The fluorescence spectra were corrected for detector response
    • The fluorescence quantum yield of Si nanocrystals dispersed in chloroform was measured relative to Rhodamine 6G in ethanol (QY = 95%) using 488 nm excitation on a fluorometer (SPEX) in a right-angle geometry. The absorbance of both Si suspension and R6G solution at 488 nm were adjusted to ∼0.06. The fluorescence spectra were corrected for detector response.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.