Abstract
Metal nano- and microparticles that are narrowly dispersed in diameter can be electrodeposited on graphite basal plane surfaces using the two-step method: First, a voltage pulse with a duration of 5 ms and an overpotential, η=−500 mV was used to nucleate metal particles on the graphite surface. Then, a growth pulse with an overpotential, η, of −20 to −250 mV was applied to grow the metal particles obtained in step 1 to the desired final diameter. For a variety of metals, including silver, gold, platinum, molybdenum, and nickel, this ‘slow-growth’ method yielded dispersions of particles ranging in diameter from 50 nm to 2 μm having a relative standard deviation (RSD dia= σ dia/〈dia〉) as low as 7%.
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