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Science 15 July 1994:
Vol. 265. no. 5170, pp. 370 - 373
DOI: 10.1126/science.265.5170.370
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Articles

Stepwise Formation of Multilayered Nanostructural Films from Macromolecular Precursors

Elaine R. Kleinfeld 1 and Gregory S. Ferguson 1

1 Department of Chemistry, Lehigh University, Bethlehem, PA 18015, USA.

Sequential adsorption of a cationic polyelectrolyte and individual sheets of the silicate mineral hectorite has allowed controlled, stepwise formation of multilayered films on silicon wafers. Each component adsorbs rapidly by an ion-exchange mechanism, and x-ray diffractometry indicates structural order even in films with thicknesses greater than 0.2 micrometer. The large lateral extent of the silicate sheets (about 25 to 35 nanometers) allows each layer to cover any packing defects in the underlying layer, thus preserving structural order in the growing film. With careful choice of component materials, this method should allow for the preparation of multilayered films with a variety of technologically important properties.

Submitted on February 16, 1994
Accepted on May 16, 1994


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Science. ISSN 0036-8075 (print), 1095-9203 (online)