electrodeposition of nickel nanoparticles on polypyrroleleung.uwaterloo.ca/group meetings/2002...
TRANSCRIPT
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Electrodeposition of Nickel Nanoparticles on
Polypyrrole
Kimberly DickSeptember 20, 2002
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Kimberly Dick 2
Overview• Previous success with electrodeposition of cubic copper
nanocrystals• Goal: to achieve similar results with nickel – produce
nanocrystals of uniform size, shape, and distribution• FCC structure of nickel: aim to produce single-crystal
cubes• Motivation: catalytic properties of nickel – possible
application in catalysis science
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Kimberly Dick 3
Cubic Copper Nanocrystals
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Kimberly Dick 4
Method• Electrodeposition of ~ 100 nm polypyrrole
– Deposit at 0.8 V overpotential– Control thickness by controlling total charge transfer
• Electrodeposition of ~ 1 ML Ni• Solution of 0.01 M NiSO4, 0.01 M NaClO4 (adaptation of
copper deposition)• Deposit at constant potential
– Typically ~ -0.6 V for Cu– Perform cv scan to determine deposition potential for Ni
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Nickel Deposition from cvScan
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New method
• Use recipe obtained from literature (Lachenwiter & Magnussen, 2001)
• 0.01 M NiSO4, 0.01 M H3BO3, 0.0001 M H2SO4• Recipe originally used to deposit layer of nickel on bare
gold electrodes (by cv scan)
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cv Scan by New Method
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Ni on Au by cv Scan
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Kimberly Dick 9
Ni on Ppy at –1.2 V
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Regular Ni Nanocrystals –1.4V
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Morphology of Ni Growth
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Clustering Nanoparticles
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Ni Nanowires – 1.3V
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Clustered Nanowires
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Rectangular Nanoparticles
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Sensitivity to Potential – 1.5V
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Effect of Polymer Morphology and Thickness
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Further Study
• Effect of potential – examine smaller increments (0.1 V difference)
• Effect of polymer – vary thickness to determine effect• Nickel/electrolyte concentrations• e-beam lithography – controlled deposition