Ultrasmall particles of CdSe and CdS formed in Nafion by an ion-dilution technique

Eugene S. Smotkin, R. Malcolm Brown, L. K. Rabenberg, K. Salomon, Allen J. Bard, Alan Campion, Marye Anne Fox, Thomas E. Mallouk, Stephen E. Webber, John M. White

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Abstract

The transition of semiconductor chalcogenides from molecular CdX (X = Se, S) to bulk material has been observed in Nafion, a cation-exchange membrane. The two-phase structure of Nafion, consisting of a hydrophobic region and ionic clusters, has been utilized to form ultrasmall particles of CdS/Se by using a technique analogous to an inverted micelle microemulsion method, where the Cd ion/ionomer cluster ratio is controlled by diluting the cadmium-exchange solution with an inert ion (Ca2+). The absorption onset for the cadmium chalcogenides formed can be tuned over a range of more than 3.5 eV by varying the Cd2+/Ca2+ ratio in the solution used to exchange the acidic form of the ionomer membrane.

Original languageEnglish (US)
Pages (from-to)7543-7549
Number of pages7
JournalJournal of physical chemistry
Volume94
Issue number19
StatePublished - Dec 1 1990

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

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    Smotkin, E. S., Brown, R. M., Rabenberg, L. K., Salomon, K., Bard, A. J., Campion, A., Fox, M. A., Mallouk, T. E., Webber, S. E., & White, J. M. (1990). Ultrasmall particles of CdSe and CdS formed in Nafion by an ion-dilution technique. Journal of physical chemistry, 94(19), 7543-7549.