Nano porous alumina template with funnel pores structure

Document Type : Original Article

Authors

Alzahra University

Abstract

In this research, we fabricated a porous alumina template with nano meter funnel pores, that using two anodizing steps with different voltages by the electrochemical method. FE-SEM analysis was used to determine the pores morphology of the templates, that shows the funnel pores which are formed as a result of voltage reduction in the second anodization. In this process, by creating funnel pores, we were able to increase the porosity and the specific surface area of the porous alumina template, which can increase the electrical capacitance of the template as a capacitor dielectric from 6 pF to 50 pF at a frequency of 50 kHz. Use of this template as a capacitor dielectric would be a more effective method to improve the capacitance of capacitors. Also, by measuring the electrical capacity and loss of the samples, the conductivity at different frequencies were calculated.

Keywords

Main Subjects

Article Title [Persian]

قالب آلومینای نانو متخلخل با حفره های قیفی شکل

Authors [Persian]

  • صدیقه دادرس
  • هدیه چراغپور
  • فاطمه مشهدی

دانشگاه الزهرا

Abstract [Persian]

در این پژوهش قالب آلومینای متخلخل با حفره های نانومتری قیفی شکل با استفاده از آندایزاسیون دو مرحله ای با ولتاژ های مختلف به روش الکتروشیمیایی ساخته شد. با آنالیز FE-SEM مورفولوژی حفره های قالب تعیین شد که تشکیل حفره های قیفی شکل بر اثر کاهش ولتاژ در آندایزاسیون دوم را نشان می داد. در این فرآیند با ایجاد حفره های قیفی شکل، توانستیم تخلخل و سطح ویژه قالب آلومینای متخلخل را افزایش دهیم که می تواند ظرفیت الکتریکی قالب را به عنوان دی الکتریک خازن از 6 pF به 50 pF در فرکانس 50 kH افزایش دهد. استفاده از این قالب به عنوان دی الکتریک خازن روش موثری برای بهبود ظرفیت خازن ها خواهد بود. همچنین با اندازه گیری ظرفیت الکتریکی و اتلاف نمونه، رسانندگی در فرکانس های مختلف محاسبه شد.

Keywords [Persian]

  • قالب AAO
  • نانو متخلخل
  • ظرفیت الکتریکی
  • آندیزاسیون
  • روش الکتروشیمیایی
[1] Park SS, Lee BT. Anodizing properties of high dielectric oxide films coated on aluminum by sol-gel method. Journal of electroceramics. 2004 Jul;13:111-6.
[2] Du X, Cai D, Ou Q, Chen D, Zhang Z, Liang P. Fabrication and characterization of the hierarchical AAO film and AAO-MnO2 composite as the anode foil of aluminum electrolytic capacitor. Surface and Coatings Technology. 2021 Aug 15;419:127286.
[3] De Azevedo WM, De Carvalho DD, Khoury HJ, De Vasconcelos EA, da Silva Jr EF. Spectroscopic characteristics of doped nanoporous aluminum oxide. Materials Science and Engineering: B. 2004 Sep 25;112(2-3):171-4.
[4] Pathiraja G, Yarbrough R, Rathnayake H. Fabrication of ultrathin CuO nanowires augmenting oriented attachment crystal growth directed self-assembly of Cu (OH) 2 colloidal nanocrystals. Nanoscale Advances. 2020;2(7):2897-906.
[5]  Dadras S, Awani E, Dariani RS. Simple fabrication of highly ordered anodic aluminum oxide (AAO) films. Int. J. Mater. Res., 2015, 106: 902-908.
[6] Sulka GD, Brzózka A, Liu L. Fabrication of diameter-modulated and ultrathin porous nanowires in anodic aluminum oxide templates. Electrochimica Acta. 2011 May 30;56(14):4972-9.
[7] Lee MH, Lim N, Ruebusch DJ, Jamshidi A, Kapadia R, Lee R, Seok TJ, Takei K, Cho KY, Fan Z, Jang H. Roll-to-roll anodization and etching of aluminum foils for high-throughput surface nanotexturing. Nano letters. 2011 Aug 10;11(8):3425-30.
[8] Chu SZ, Inoue S, Wada K, Li D, Haneda H. Highly porous TiO 2/Al 2 O 3 composite nanostructures on glass by anodization and the sol–gel process: fabrication and photocatalytic characteristics. Journal of Materials Chemistry. 2003;13(4):866-70.
[9] Dadras S, Aawani E. Fabrication of YBCO nanowires with anodic aluminum oxide (AAO) template. Physica B: Condensed Matter. 2015 Oct 15;475:27-31.
[10] Kim YJ, Yamada H, Moon T, Kwon YJ, An CH, Kim HJ, Kim KD, Lee YH, Hyun SD, Park MH, Hwang CS. Time-dependent negative capacitance effects in Al2O3/BaTiO3 bilayers. Nano letters. 2016 Jul 13;16(7):4375-81.
[11] Sulka GD. Highly ordered anodic porous alumina formation by self‐organized anodizing. Nanostructured materials in electrochemistry. 2008 Feb 20:1-16.
[12] Zaraska L, Sulka GD, Jaskuła M. Anodic alumina membranes with defined pore diameters and thicknesses obtained by adjusting the anodizing duration and pore opening/widening time. Journal of Solid State Electrochemistry. 2011 Dec;15:2427-36.
[13] Sakairi M, Fujita R, Nagata S. Formation of oxide films for high‐capacitance aluminum electrolytic capacitor by liquid‐phase deposition and anodizing. Surface and Interface Analysis. 2016 Aug;48(8):899-905.
[14] Du X, Cai D, Ou Q, Chen D, Zhang Z, Liang P. Fabrication and characterization of the hierarchical AAO film and AAO-MnO2 composite as the anode foil of aluminum electrolytic capacitor. Surface and Coatings Technology. 2021 Aug 15;419:127286.
 [15] Chen B, Xu Q, Zhao X, Zhu X, Kong M, Meng G. Branched Silicon Nanotubes and Metal Nanowires via AAO‐Template‐Assistant Approach. Advanced Functional Materials. 2010 Nov 9;20(21):3791-6.
[16] Furneaux RC, Rigby WR, Davidson AP. The formation of controlled-porosity membranes from anodically oxidized aluminium. Nature. 1989 Jan 12;337(6203):147-9.
[17] Choi J, Sauer G, Nielsch K, Wehrspohn RB, Gösele U. Hexagonally arranged monodisperse silver nanowires with adjustable diameter and high aspect ratio. Chemistry of materials. 2003 Feb 11;15(3):776-9.
[18] Sulka GD. Highly ordered anodic porous alumina formation by self‐organized anodizing. Nanostructured materials in electrochemistry. 2008 Feb 20:1-16.
[19] Lee W, Ji R, Gösele U, Nielsch K. Fast fabrication of long-range ordered porous alumina membranes by hard anodization. Nature materials. 2006 Sep 1;5(9):741-7.
[20] da Silva AB, Arjmand M, Sundararaj U, Bretas RE. Novel composites of copper nanowire/PVDF with superior dielectric properties. Polymer. 2014 Jan 14;55(1):226-34.
[21] Stępniowski WJ, Nowak-Stępniowska A, Michalska-Domańska M, Norek M, Czujko T, Bojar Z. Fabrication and geometric characterization of highly-ordered hexagonally arranged arrays of nanoporous anodic alumina. Polish Journal of Chemical Technology. 2014 Jan 1;16(1):63-9.
[22] Ban CL, Zhu SQ, Hou JL, Wang FR, Wang J. Effect of electrodepositing Ag on DC etching aluminum foils for electrolytic capacitor. Journal of Materials Science: Materials in Electronics. 2017 May;28:6860-4.
[23] Ban CL, Hou JL, Zhu SQ, Wang CZ. Formation and properties of Al 2 O 3–ZrO 2 composite anodic oxide film on etched aluminum foil by electrodeposition and anodization. Journal of Materials Science: Materials in Electronics. 2016 Feb;27:1547-52.
[24] Hong CT, Chu LA, Chiang AS, Fang W. Nanotexture electrode on nanoporous AAO dielectric for micro tactile sensing devices. In2009 IEEE 22nd International Conference on Micro Electro Mechanical Systems 2009 Jan 25 (pp. 100-103). IEEE.
[25] Filatova EO, Konashuk AS. Interpretation of the changing the band gap of Al2O3 depending on its crystalline form: connection with different local symmetries. The Journal of Physical Chemistry C. 2015 Sep 3;119(35):20755-61.
[26] Hosseini SM, Aliabad HR, Kompany A. Influence of La on electronic structure of α-Al2O3 high k-gate from first principles. Ceramics international. 2005 Jan 1;31(5):671-5.