By a News Reporter-Staff News Editor at Science Letter -- Current study results on Materials Science and Physical Chemistry have been published. According to news originating from Kingston, Canada, by NewsRx correspondents, research stated, "Electrochemical treatment of Au(111) in aqueous H2SO4 solution by repetitive application of oxide formation-reduction cycles (OFRC) generates nanopatterned surfaces with long-range order. The pattern development depends on the lower and upper potential limits (E-L, E-U), the number (n) of OFRCs, and the potential scan rate (s)."
Our news journalists obtained a quote from the research from Queen's University, "Surface patterning of Au( 111) initially (n = 1-2) generates small islands and holes that are one atomic step in height. As n increases to 5, the number of islands decreases and the holes become larger; after n = 10 OFRCs, the islands become inexistent and large, randomly distributed holes are observed. Increase of OFRCs to n = 20 generates surface structures that reside within three atomic layers and resemble phase separation through a spinodal decomposition mechanism. As the number of OFRCs rises to n = 50, a network of interconnected islands and holes emerges; the islands and holes are two-three atomic steps in height, and are located within topmost five monolayers. Further increase of the number of OFRCs to n = 100 creates a network of interconnected trigonal pyramids that are pointed in the same direction. The size of the pyramids depends on the electrolyte composition and the number of OFRCs. In the case of n = 100, the pyramids are 12-25 tun in base length and 0.4-1.6 nm in height in 0.1 M aqueous H2SO4, and 20-50 nm in base length and 0.8-1.6 nm in height in 0.1 M aqueous HNO3."
According to the news editors, the research concluded: "The number of OFRCs and scan rate play an important role in patterning of Au(111), and complete nanopattern development requires a large number of OFRCs and low scan rates."
For more information on this research see: Roughening and Long-Range Nanopatterning of Au(111) through Potential Cycling in Aqueous Acidic Media. Langmuir, 2013;29(32):10272-10278. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)
The news correspondents report that additional information may be obtained from C. Kontje, Queen's University, Dept. of Chem, Kingston, ON K7L 3N6, Canada. Additional authors for this research include D.M. Kolb and G. Jerkiewicz (see also Materials Science and Physical Chemistry).
Keywords for this news article include: Canada, Ontario, Kingston, North and Central America, Materials Science and Physical Chemistry
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC