Abstract
CdS nanoclusters were synthesized by using n-octylthiol as a ligand and n-hexadecyltrimethyl-ammonium bromide (or n-tetrabutylammonium bromide) as an organic cation. Sizeselective precipitation techniques have enabled the preparation of different CdS Q-nanoparticles with narrow size distribution and mean diameters ranging from 2 to 5 nm. UV-Vis spectroscopy, transmission electron microscopy and small-angle X-ray scattering were used to determine the mean cluster size. Their size quantization effect has been observed in UV-Vis spectra, fluorescence spectra and small-angle X-ray diffraction, but it became too weak to be observed for large particles (2r > 10 nm). Moreover, their photo-catalysis has been studied by ESR technique and the results revealed that the photo-catalytic reaction occurred in the solution system and some free radicals such as CH2-OH in methanol, or CH3-CH-OH in ethanol were generated if some CdS Q-particles were added to methanol (or ethanol) and initiated by UV light at the same time, which may be very crucial in organic synthesis.
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References
Alivisatos, P., Semiconductor clusters, nanocrystals, and quantum dots, Science, 1996, 271: 933–937.
Braun, P. V., Osenar, P., Stupp, S. I., Semiconducting superlattices templated by molecular assemblies, Nature, 1996, 380: 325–328.
Shenton, W., Pum, D., Sleytr, U. B. et al., Synthesis cadmium sulphide superlattices using self-assembled bacterial S-layers, Nature, 1997, 389: 585–587.
Soloviev, V. N., Eichhofer, A., Fenske, D. et al., Size-dependent optical spectroscopy of a homologous series of CdS cluster molecules, J. Am. Chem. Soc, 2001, 123: 2354–2364.
Brus, L. E., Electron wave functions in semiconductor clusters: experiment and theory, J. Phys. Chem., 1986, 90(12): 2555–2560.
Vossmeyer, T., Katsikas, L., Giersig, M. et al., CdS nanoclusters: synthesis, characterization, size dependent oscillator strength, temperature shift of the excitonic transition energy, and reversible absorbance shift, J. Phys. Chem., 1994, 98: 7665–7673.
Fan, K. N., Introduction to Spectroscopy (in Chinese), Beijing: Higher Education Press, 2001, 159–180.
Dance, I. G., Choy, A., Scudder, M. L., Syntheses, properties, molecular and crystal structures of (Me4N)4[E4M10(SPh)16] (E = S, Se; M = Zn, Cd): molecular supertetrahedral fragments of the cubicmetal chalcogenide lattice, J. Am. Chem. Soc, 1984, 106: 6285–6295.
Herron, N., Calabrese, J. C., Farneth, W. E. et al., Crystal structure and optical properties of Cd32S14(SC6H5)34·DMF4, a cluster with a 15 angstrom CdS core, Science, 1993, 259: 1426–1428.
Wang, C., Li, Y., Bu, X. et al., Three-dimensional superlattices built from (M4In16S33)10− (M = Mn, Co, Zn, Cd) supertetrahedral clusters, J. Am. Chem. Soc, 2001, 123: 11506–11507.
Dameron, T., Reese R. N., Mehra, R. K. et al., A kind of small, biogenic, short-pep ti de-capped CdS cluster, Nature, 1989, 338: 596–598.
Chen, D. W., Wang, S. H., Chemical effects and size quantization in nano CdS, Science in China, Series B, 1996, 39(6): 645–653.
Wu, W. C., Feng, H. Q., Wu, K. Z., The Notebook of Standard Electrode Potentials (in Chinese), Beijing: Science Press, 1991, 87.
Wang, H., Chen, D. W., Zhang, T. et al., Photochemical introduction electron transfer and photochemical reaction of benzyl alcohol in colloid surface of TiO2, Sensitive Science and Photochemistry, 1993, 11(4): 318–324.
Kotake, Y., Kuwata, K., Janzen, E. G., Electron spin resonance spectra of diastereomeric nitroxyls produced by spin trapping hydroxyalkyl radicals, J. Phys. Chem., 1979, 83: 3024–3029.
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Weiguang, Z., Yun, Z., Jun, F. et al. Preparation, morphology, size quantization effect and photocatalytic properties of CdS Q-nanocrystals. Sc. China Ser. B-Chem. 46, 196–206 (2003). https://doi.org/10.1360/03yb9028
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DOI: https://doi.org/10.1360/03yb9028