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Nickel Nano Particles Pulse Electrodeposition

Afsari, Maryam | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45661 (57)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. Syntheses of coats including nickel nano-particles by electrodeposition have been
    investigated for over 10 years. A method of testing according to surface reply was chosen
    to reveal the effect of each pulse parameters (including duty cycle, frequency, average
    current density, off time (toff) and on time (ton)) and the effect of saccharin concentration
    on electroplating cathode efficiency, nanostructure. Pulse electroplating test of nickel was
    composed by 30 tests. Pulse electroplating with relatively high peak current density was
    employed and saccharine was added to increase deposition and rate of nickel nucleation on
    surface. According to the results of cathode efficiency, optimum condition for
    electrodeposition were 89.91%, with 3.9 mA/cm2 current density, frequency 57.5 Hz, duty
    cycle 38% and with saccharine concentration 3.8 g/l. Scanning Electron Microscope
    (SEM) was used to evaluate nickel nano-particles and their distribution. The nanostructure
    morphology of coat revealed that decreasing frequency from 155 Hz to 57Hz lead to
    change structure from dendrite to spherical mode. Also, reduction of size of spherical
    particles in nanometer range can be attributed to increase of current density from 1
    mA/cm2 to 3.9 mA/cm2. AFM microscope was used to evaluate surface roughness. The
    results of AFM disclosed that there was lower amount of roughness and porosity of surface
    in optimum pulse electroplating condition. The mean peaks distances from mean line
    (RSM) and mean distances of the highest and lowest peak (Ra) were 6.97 and 5.5 nm,
    respectively. X-ray diffraction (XRD) revealed that the preferable planes for developing
    nano-particles are (200) and (220). Intensity of peak relating to (200) was increased by
    increasing current density. In addition, coat led from watt bath with more saccharine
    concentration made increase in peak intensity related to planes (220)
  9. Keywords:
  10. Nanoparticles ; Pulse Plating ; Morphology ; Electrochemical Deposition ; Nickel ; X-Ray Photoelectron Spectroscopy (XPS)

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