Abstract
Charge carriers on colloidal semiconductors were characterized by their optical absorption spectra. They were produced in a laser flash or by means of pulse radiolysis whereby the reactions of these charge carriers could be followed. In a biphotonic process, hydrated electrons were formed from CdS. After covering the surface with Cd[OH]2, the fluorescence of the particles appeared at the band edge with a quantum yield of more than 0.5 and the photochemical stability was enhanced by several orders of magnitude to become comparable to that of fluorescence dyes, like rhodamine. Colloids of CdS or Cd3P2 could be attached to TiO2 or ZnO, respectively. In these sandwich colloids an electron transfer occurred from the exicited CdS or Cd3P2 to the TiO2 or ZnO part, whereas the positive holes remained in the excited part of the sandwich.
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References
Henglein A (1982) Ber Bunsenges Phys Chem 86:301
Henglein A, Fojtik A, Weller H (1987) Ber Bunsenges Phys Chem 91:441
Ramsden JJ, Grätzel M (1984) J Chem Soc Faraday Trans I 80:919
Nozik AJ, Williams F, Nenadovic MT, Rajh T, Micic OI (1985) J Phys Chem 89:397
Brus L (1986) J Phys Chem 90:2555
Nedeljkovic JM, Nenadovic MT, Micic OI, Nozik AJ (1986) J Phys Chem 90:12
Kuczynski J, Thomas JK (1983) J Phys Chem 87:5498
Weller H, Schmidt HM, Koch U, Fojtik A, Baral S, Henglein A, Kunath W, Weiss K, Dieman E (1986) Chem Phys Lett 124:557
Baral S, Fojtik A, Weller H, Henglein A (1986) J Am Chem Soc 108:375
Spanhel L, Haase M, Weller H, Henglein A (1987) J Am Chem Soc 109:5649
Henglein A, Kumar A, Janata E, Weller H (1987) Chem Phys Lett 132:133
Albery WJ, Brown GT, Darwent JR, Saievar-Iranizad E (1985) J Chem Soc Faraday Trans I 81:1999
Haase M, Weller H, Henglein A (1988) J Phys Chem, in press
Alfassi Z, Bahnemann D, Henglein A (1982) J Phys Chem 86:4656
Spanhel L, Weller H, Henglein A (1987) J Am Chem Soc 109:6632
Spanhel L, Weller H, Henglein A (1987) Ber Bunsenges Phys Chem 91:1359
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© 1988 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Weller, H., Haase, M., Spanhel, L., Henglein, A. (1988). Charge carrier dynamics in colloidal semiconductors. In: Degiorgio, V. (eds) Trends in Colloid and Interface Science II. Progress in Colloid & Polymer Science, vol 76. Steinkopff. https://doi.org/10.1007/BFb0114163
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DOI: https://doi.org/10.1007/BFb0114163
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