Abstract
Thin films of divalent metal (Zn and Cu) alkanebisphosphonates grow on gold surfaces modified with (4-mercaptobutyl)phosphonic acid by alternate immersion in 5 mM ethanolic solutions of the metal acetate or perchlorate salt and H 2 O 3 P(CH 2 ) n PO 3 H 2 , n=8, 10, 12,and 14. Growth of each layer is remarkably fast. Well-ordered multilayers can be deposited with 10-min adsorption steps, and films of 100-layer thickness are easily prepared. Quartz crystal microbalance (QCM) measurements of mass changes are in quantitative agreement with adsorption of individual layers corresponding to bulk stoichiometry (M 2 [O 3 P(CH 2 ) n PO 3 ].2H 2 O) and pacing density
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