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多孔型阳极氧化铝(PAA)和多孔阳极氧化钛纳米管因其在诸多领域的广泛应用而备受关注. 然而这类多孔阳极氧化物中纳米孔道的形成机理至今还不清楚, 阳极氧化过程中电流-时间曲线与多孔形貌之间的关系至今无法解释. 本文从致密型阳极氧化铝(CAA)的击穿机理入手,详细对比了CAA和PAA形成过程的区别与内在联系, 从两种氧化膜电流-时间曲线(或电压-时间曲线)的分界点这个全新视角入手, 找出了阳极氧化过程中氧化物形成效率下降的本质原因是电子电流的产生和氧气的析出. 在CAA中球形孔洞的证据充分说明初期的规则孔洞是氧气气泡形成的. 铝在混合电解液中阳极氧化的结果表明, 一旦氧气析出停止,孔道生长就停止并被致密型的氧化物覆盖, 一种新型的复合型氧化膜由此而得. 最终结果表明: 在PAA的形成过程中, 适当的电子电流是氧气析出和孔洞形成的保证, 适当的离子电流是氧化物形成和孔壁生长的保证.Porous anodic alumina (PAA) and porous anodic TiO2 nanotubes have received considerable attention because of their applications in a number of fields. The formation mechanisms of nanopores and nanotubes in these porous anodic oxides, however, have remained unclear until now. The interactions between porous structural features and current-time transients in anodizing process cannot be successfully explained. Based on the mechanism of dielectric breakdown of the compact anodic alumina (CAA), the differences and internal relations in their forming processes between CAA and PAA are contrasted in detail. From this innovative standpoint, according to the divergence of PAA and CAA in their current-time curves (or voltage-time curves), two essential causes which induce the decrease of the forming efficiency of oxide in the anodizing process, that is, the generation of the electronic current and the oxygen evolution, are presented in the paper. The evidences of the round hollows within the CAA films, show that the regularly embryo pores result from the oxygen bubbles. According to the aluminum anodizing in the mixed-electrolyte, the results show that once oxygen evolution stopping, the pore growth must be stopped, and the pores must be sealed by the above compact oxide. A novel composite film of the anodic oxide is presented. All of the above conclusively show that in the forming process of PAA, an appropriate magnitude of electronic current ensures the oxygen evolution and the pores formation, an appropriate magnitude of ionic current ensures the oxide formation and growth of pore walls.
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Keywords:
- anodization /
- porous anodic alumina (PAA) /
- electronic current /
- nanoporous materials
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[1] Platschek B, Keilbach A, Bein T 2011 Adv. Mater. 23 2395
[2] Huang C, Jiang J, Lu M, Sun L, Meletis E I, Hao Y 2009 Nano Lett. 9 4297
[3] Gu J J, Han J R, Cheng F W, Zhao G L, Liu L H, Sun H Y 2012 Acta Phys. Sin. 61 097503 (in Chinese) [顾建军, 韩金荣, 成福伟, 赵国良, 刘力虎, 孙会元 2012 61 097503]
[4] Wang X L Q, Zhang D X, Zhang H J 2011 Acta Phys. Sin. 60 058104 (in Chinese) [王旭龙琦, 张冬仙, 章海军 2011 60 058104]
[5] Li Q, Wang K G, Dang W J, Hui D, Ren Z Y, Bai J T 2010 Acta Phys. Sin. 59 5851(in Chinese) [李强, 王凯歌, 党维军, 惠丹, 任兆玉, 白晋涛 2010 59 5851]
[6] Wu Z G, Zhang P J, Xu L, Li S K, Wang J, Li X D, Yan P X 2010 Acta Phys. Sin. 59 438 (in Chinese) [吴志国, 张鹏举, 徐亮, 李拴魁, 王君, 李旭东, 闫鹏勋 2010 59 438]
[7] Wang C W, Ma B H, Li Y, Chen J B, Wang J, Liu W M 2008 Acta Phys. Sin. 57 5800 (in Chinese) [王成伟, 马保宏, 李燕, 陈建彪, 王建, 刘维民 2008 57 5800]
[8] Lin J, Liu K, Chen X F 2011 Small 7 1784
[9] Habazaki H, Teraoka M, Aoki Y, Skeldon P, Thompson G E 2010 Electrochim. Acta 55 3939
[10] Lee K, Kim D, Roy P, Paramasivam I, Birajdar B I, Spiecker E, Schmuki P 2010 J. Am. Chem. Soc. 132 1478
[11] Li S Q, Yin J B, Zhang G M 2010 Sci. China. Chem. 53 1068 (in Chinese) [李仕琦, 尹建波, 张耿民 2010 中国科学: 化学 53 1068]
[12] Wang D A, Liu Y, Yu B, Zhou F, Liu W M 2009 Chem. Mater. 21 1198
[13] Jessensky O, Müller F, Gösele U 1998 Appl. Phys. Lett. 72 1173
[14] Li A P, Müller F, Birner A, Nielsch K, Gösele U 1998 J. Appl. Phys. 84 6023
[15] Nielsch K, Choi J, Schwirn K, Wehrspohn R B, Gösele U 2002 Nano Lett. 2 677
[16] Lee W, Schwirn K, Steinhart M, Pippel E, Scholz R, Gösele U 2008 Nat. Nanotechnol. 3 234
[17] Skeldon P, Thompson G E, Garcia-Vergara S J, Iglesias-Rubianes L, Blanco-Pinzon C E 2006 Electrochem. Solid. St. 9 B47
[18] Garcia-Vergara S J, Skeldon P, Thompson G E, Habazaki H 2006 Electrochim. Acta 52 681
[19] Garcia-Vergara S J, Habazaki H, Skeldon P, Thompson G E 2010 Electrochim. Acta 55 3175
[20] Houser J E, Hebert K R 2009 Nat. Mater. 8 415
[21] Houser J E, Hebert K R 2006 J. Electrochem. Soc. 153 B566
[22] Li D D, Zhao L, Jiang C H, Lu J G 2010 Nano Lett. 10 2766
[23] Li D D, Jiang C H, Jiang J H, Lu J G 2009 Chem. Mater. 21 253
[24] Su Z X, Zhou W Z 2008 Adv. Mater. 20 3663
[25] Su Z X, Bühl M, Zhou W Z 2009 J. Am. Chem. Soc. 131 8697
[26] Su Z X, Zhou W Z 2011 J. Mater. Chem. 21 357
[27] Berger S, Hahn R, Roy P, Schmuki P 2010 Phys. Status Solidi B 247 2424
[28] Roy P, Berger S, Schmuki P 2011 Angew. Chem. Int. Ed. 50 2904
[29] Liu H W, Guo H M, Wang Y L, Shen C M, Yang H T, Wang Y T, Wei L 2004 Acta Phys. Sin. 53 656 (in Chinese) [刘虹雯,郭海明,王业亮,申承民,杨海涛,王雨田,魏龙 2004 53 656]
[30] Zhu X F, Han H, Song Y, Duan W Q 2012Acta Phys. Chim. Sin. 28 1291 (in Chinese) [朱绪飞, 韩华, 宋晔, 段文强 2012 物理化学学报 28 1291]
[31] Patermarakis G, Moussoutzanis K 2009 Electrochim. Acta 54 2434
[32] Patermarakis G 2009 J. Electroanal. Chem. 635 39
[33] Keller F, Hunter M S, Robinson D L 1953 J. Electrochem. Soc. 100 411
[34] Diggle J W, Downie T C, Goulding C W 1969 Chem. Rev. 69 365
[35] O'Sullivan J P, Wood G C 1970 Proc. R. Soc. Lond. A 317 511
[36] Thompson G E, Furneaux R C, Wood G C, Richardson J A, Goode J S 1978 Nature 272 433
[37] Thompson G E, Wood G C 1981 Nature 290 230
[38] Furneaux R C, Rigby W R, Davidson A P 1989 Nature 337 147
[39] Parkhutik V P, Shershulsky V I 1992 J. Phys. D: Appl. Phys. 25 1258
[40] Thompson G E 1997 Thin Solid Films 297 192
[41] Masuda H, Hasegwa F, Ono S 1997 J. Electrochem. Soc. 144 L127
[42] Poinern G E J, Ali N, Fawcett D 2011 Materials 4 487
[43] Su Z X, Zhou W Z 2011 J. Mater. Chem. 21 8955
[44] Li Y, Shimada H, Sakairi M, Shigyo K, Takahashi H, Seo M 1997 J. Electrochem. Soc. 144 866
[45] Zhu X F, Liu L, Zhao B C 2003 The Chinese Journal of Nonferrous Metals 13 1031 (in Chinese) [朱绪飞, 刘 霖, 赵宝昌 2003 中国有色金属学报 13 1031]
[46] Macak J M, Tsuchiya H, Ghicov A, Yasuda K, Hahn R, Bauer S, Schmuki P 2007 Curr. Opi. Solid. St. M. 11 3
[47] Ghicov A, Schmuki P 2009 Chem. Commun. 45 2791
[48] Li F Y, Zhang L, Metzger R M 1998 Chem. Mater. 10 2470
[49] Albella J M, Montero I, Martinez-Duart J M 1987 Electrochim. Acta 32 255
[50] Zhu X F, Liu L, Song Y, Jia H, Yu H, Xiao X, Yang X 2008 Mater. Lett. 62 4038
[51] Zhu X F, Liu L, Song Y, Jia H, Yu H, Xiao X, Yang X 2008 Monatsh. Chem. 139 999
[52] Crossland A C, Habazaki H, Shimizu K, Skeldon P, Thompson G E, Wood G C, Zhou X, Smith C J 1999 Corros. Sci. 41 1945
[53] Zhou X, Thompson G E, Habazaki H, Paez M A, Shimizu K, Skeldon P, Wood G C 2000 J. Electrochem. Soc. 147 1747
[54] Habazaki H, Konno H, Shimizu K, Nagata S, Skeldon P, Thompson G E 2004 Corros. Sci. 46 2041
[55] Schwirn K, Lee W, Hillebrand R, Steinhart M, Nielsch K, Gösele U 2008 ACS Nano 2 302
[56] Lee W, Scholz R, Gösele U 2008 Nano Lett. 8 2155
[57] Chung C K, Zhou R X, Liu T Y, Chang W T 2009 Nanotechnology 20 055301
[58] Ispas A, Bund A, Vrublevsky I 2010 J. Solid State Electrochem. 14 2121
[59] Li Y, Ling Z Y, Hu X, Liu Y S, Chang Y 2011 J. Mater. Chem. 21 9661
[60] Li Y, Ling Z Y, Hu X, Liu Y S, Chang Y 2011 Chem. Commun. 47 2173
[61] Zhang R, Jiang K M, Zhu Y, Qi H Y, Ding G Q 2011 Appl. Surf. Sci. 258 586
[62] Patermarakis G, Moussoutzanis K 2011 J. Electroanal. Chem. 659 176
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