Morphology of CdS Nanocrystals Synthesized in a Mixed Surfactant System

Nano Letters

Volumn 2, Issue 4, 2002, Pages 263-268

  Simmons, Blake A ^a   Li, Sichu ^a   John, Vijay T ^a   McPherson, Gary L ^a   Bose, Arijit ^b   Zhou, Weilie ^c   He, Jibao ^c  

^a Tulane University   (United States)

^b University of Rhode Island   (United States)

^c UNIVERSITY OF NEW ORLEANS   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0003294054     PISSN: 15306984     EISSN: None     Source Type: Journal    
DOI: 10.1021/nl010080k     Document Type: Article

References (49)

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33. 95% pure L-α-phosphatidylcholine (lecithin) extracted from soybeans was purchased from Avanti Polar Lipids, Inc. Dioctyl sulfosuccinate (AOT), 2,2,4-trimethylpentane (isooctane, 99% purity), cadmium chloride, and sodium sulfide were purchased from Sigma-Aldrich. All chemicals were used without further purification and/or treatment. Distilled water was used in all experiments.
34. Two stock solutions with differing molar ratios of AOT and lecithin were synthesized by adding the measured amount of either surfactant to a specific volume of isooctane and sonicating the mixture until a clear isotropic solution was obtained. The two stock solutions had AOT/lecithin molar compositions of (1) 0.1 M AOT with no lecithin, (2) 0.05 M AOT/0.05 M lecithin.
35. 2-] = 2. After mixing the two precursor solutions, a yellow color change was observed for all samples, a positive indication of the presence of CdS. No macroscopic precipitation was observed in the reaction vials.
36. Fluorescence emission spectra were recorded with a Perkin-Elmer LS-50 fluorimeter equipped with a Xe discharge lamp with an 8 μs, 20 kW discharge. Samples were transferred via pipet into a quartz cuvette for analysis. The discharge frequency of the fluorimeter is the same as the line frequency of 60 Hz, and the average lamp energy output is 10 W. A slit width of 10 nm was utilized in all experiments.
37. X-ray powder diffraction patterns were obtained with a Scintag diffractometer. Scans were collected at 45 kV and 40 mA with a step size of 0.02° every 0.5 s. Samples were prepared by isolating the CdS nanoparticles by centrifugation at 2500 rpm for 30 min. Samples were then resuspended, centrifuged, and washed with ethanol, methanol, and water. The samples were then dried in a vacuum oven at 40°C for 4 h, and the resulting powders were placed on glass slides for X-ray data acquisition.
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