Controlled growth and monitoring of tantalum oxide nanostructures

Nanoscale
Hany A El-Sayed, Viola I Birss

Abstract

Nanoporous metal oxide structures produced by the electrochemical anodization of valve metals, such as Zr, Ti, W, Nb, Al, and recently Ta, have attracted increasing interest because of their potential use as catalysts, waveguides, and three-dimensionally arranged Bragg-stack reflectors. Here we demonstrate the formation of either supported nanotubular Ta oxide films or free-standing Ta oxide membranes, produced by controlling the conditions of Ta anodization in organic-free aqueous HF/H(2)SO(4) solutions. The supported oxide nanotubes, which are at least 15 mum in length, are characterized by very good adhesion to the Ta substrate, and extremely smooth and homogeneous walls. It is also reported here, for the first time, that these nanotubular films can be removed as free-standing Ta oxide membranes that are easily transferable to other substrates, making them potentially useful in sensors, optics, and catalysis. We also show that, when the Ta oxide nanotubes detach to form the membranes, they leave behind an ordered array of dimples in the Ta surface, with the dimples having the identical distribution and size as the pores in the previously attached nanotubes. Finally, we demonstrate how the in situ electrochemical response dur...Continue Reading

References

Oct 26, 2005·Angewandte Chemie·Jan M MacakPatrik Schmuki
Dec 14, 2006·Nano Letters·Hany El-SayedPeter Kruse
Aug 1, 2007·Nano Letters·Sherdeep SinghPeter Kruse

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Citations

Feb 18, 2014·Physical Chemistry Chemical Physics : PCCP·Renato V GonçalvesLiane M Rossi
May 23, 2012·Journal of Hazardous Materials·Yingxun DuYaling Su
Mar 20, 2012·Trends in Biotechnology·Karla S BrammerSungho Jin
Apr 1, 2015·Physical Chemistry Chemical Physics : PCCP·Hany A El-SayedViola I Birss
Mar 11, 2020·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Ece UsluBatur Ercan
Sep 22, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Hamed Hajibabaei, Thomas W Hamann

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