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(a). (b). Effects of Annealing. SEM surface morphology of porous alumina substrates sputtered with 20 nm Ni. (a) As sputtered smooth surface before annealing. (b) After annealing at 500 o C under H 2 for two hours. - PowerPoint PPT Presentation
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Effects of AnnealingEffects of Annealing
• SEM surface morphology SEM surface morphology of porous alumina of porous alumina substrates sputtered with substrates sputtered with 20 nm Ni. 20 nm Ni. – (a) As sputtered smooth (a) As sputtered smooth
surface before annealing. surface before annealing. – (b) After annealing at 500(b) After annealing at 500ooC C
under Hunder H22 for two hours. for two hours.
– The continuous nickel thin The continuous nickel thin film transformed to film transformed to uniformly distributed nano-uniformly distributed nano-sized particles. sized particles.
(a)
(b)
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Effects of Annealing (cont.)Effects of Annealing (cont.)(c) (d)
(e)
(c), (d) CNTs grown without annealing(e) CNTs grown after annealing