Accession Number : ADA296839

Title :   Electrochemical Deposition of Silver Nanocrystallites on the Atomically Smooth Graphite Basal Plane.

Descriptive Note : Interim rept. May 94-Jun 95,

Corporate Author : CALIFORNIA UNIV IRVINE DEPT OF CHEMISTRY

Personal Author(s) : Zoval, J. ; Stiger, R. M. ; Biernacki, P. R ; Penner, R. M.

PDF Url : ADA296839

Report Date : 30 JUN 1995

Pagination or Media Count : 32

Abstract : A potentiostatic pulse method has been employed to electrochemically deposit silver nanocrystallites on the atomically smooth graphite basal plane surface. Voltage pulses having amplitudes of 100, 250, and 500 mV vs. Ag(sup o) and durations of 10 and 50 ms were applied to graphite surfaces immersed in 1.0 mM aqueous AgF. I vs. t transients recorded during the deposition increased in proportion to t(1/2) for all depositions. This behavior is diagnostic of an instantaneous nucleation, and three-D growth mode of deposition. Consistent with this model, non-contact atomic force microscopy (NC-AFM) examination of the graphite surface following deposition revealed the existence of silver particles at a coverage of near 10(exp 10)/sq cm. These particles were disk-shaped having a height of 15 to 50A, and an apparent diameter of 200A to 600 A; these dimensions increased smoothly with the coulometric loading. jg p.2

Descriptors :   *ELECTROCHEMISTRY, *GRAPHITE, *DEPOSITION, *SILVER, TRANSIENTS, VOLTAGE, CRYSTALS, NUCLEATION, MICROSCOPY, SURFACES, THREE DIMENSIONAL, PARTICLES, PULSES, POTENTIOSTATIC TECHNIQUES, ATOMIC PROPERTIES, COULOMETERS.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Crystallography
      Electricity and Magnetism
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE