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Nanowire Fabrication Based on Porous Alumina Template

Nanowire Fabrication Based on Porous Alumina Template. EE235 Nanofabrication Jie Yao April 09, 2007. Porous oxide – unique for Al. Al can be anodized into porous oxide, which is an unique property of aluminum. Schematic of the anodic porous aluminum oxide layer.

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Nanowire Fabrication Based on Porous Alumina Template

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  1. Nanowire Fabrication Based on Porous Alumina Template EE235 Nanofabrication Jie Yao April 09, 2007

  2. Porous oxide – unique for Al • Al can be anodized into porous oxide,which is an unique property of aluminum Schematic of the anodic porous aluminum oxide layer SEM images of the porous alumina layer

  3. Electrochemical mechanism • The overall reaction that takes place during anodization is: 2Al + 3H2O => Al2O3 + 3H2 At the anode: 2Al + 3O2- => Al2O3 + 6e- At the cathode: 6H+ + 6e- ==> 3H2 • The Al is oxidized at the metal/oxide interface • The oxide is etched away by the acid with the applied potential • The pores are induced by the roughness of the top surface TEM micrographs

  4. Regular hole array – top view • The mechanism determines that the holes can form regular arrays: The distance between the holes tends to be uniform • Type of acid, concentration, temperature and applied voltage are the major factors that affects the porous structure SEM images of the regular hole arrays with different hole diameters (top view)

  5. Ideally Ordered Anodic PorousAlumina Using Pretextured Al • H. Asoh, K. Nishio, M. Nakao, T. Tamamura, and H. Masuda, Journal of The Electrochemical Society Vol. 148 SiC mold used to make the perfect array on Al Ideally ordered hole arrays

  6. Ideally Ordered Anodic PorousAlumina • Both the texture and the reaction mechanism determines the pore array formation Side view

  7. Metal nanowire growth • Metal nanowires, such as silver, gold, nickel, can be fabricated in the template using electroplating method SEM images showing nanowires grown inside the porous template

  8. Fabrication processes Rinse with deionized water • Removal of aluminum • Handling with glass slide In a plastic basket Template Barrier layer Aluminum HgCl2

  9. Fabrication processes • Seed layer deposition Silver Glass slide

  10. Nanowire growth • Barrier layer removal • Nanowire deposition Pt anode H3PO4 Ag+ Cu plate

  11. Selective area growth • M.A.S.Chong et al, Appl.Phys.Lett. (2006)

  12. Semiconductor nanowires Z. Fan et al, Appl. Phys. Lett. (2006)

  13. Fabrication of carbon nanotubes • The films were impregnated under vacuum with a mixture of furfuryl alcohol and oxalic acid • Polymerization and carbonization T Kyotani et al, Chem. Mater. 1996

  14. Metal Nanodot Arrays • S.K.Park et al, Cur.Appl.Phys. (2007) • Au, Al, Ag, Cu, Pb, Sn, and Zn nanodots have been made • Melting point determines the way of deposition

  15. Thank you

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