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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
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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.
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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.
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12
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0348106969
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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
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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.
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13
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0347476951
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+ 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.
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note
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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
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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.
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24
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0001348828
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