140. 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.