Please use this identifier to cite or link to this item:
|Title:||Electrochromic writing and erasing on tungsten oxide films in air by scanning tunneling microscopy||Authors:||Qiu, H.
|Issue Date:||1-Jan-2002||Citation:||Qiu, H., Lu, Y.F., Mai, Z.H. (2002-01-01). Electrochromic writing and erasing on tungsten oxide films in air by scanning tunneling microscopy. Journal of Applied Physics 91 (1) : 440-443. ScholarBank@NUS Repository. https://doi.org/10.1063/1.1424053||Abstract:||The scanning tunneling microscope (STM) was used for both spot coloring and bleaching on α-WO3-x thin films. By wetting the STM tip with 1 M KOH solutions or de-ionized water before the tip approached, and keeping the humidity higher than 40%, the electrochemical reaction occurred at the tip-surface gap while the electrochromic reactions took place at the film surface. With a constant negative sample bias and grounded tip, a brown color circle or a light blue disk was formed on the surface with an enlarged diameter. The circle and disk formations were attributed to the production of alkali and hydrogen tungsten bronzes. By applying a positive sample bias with a grounded tip, the color of the hydrogen tungsten bronze could be bleached. The cathodic reduction of W6+ forms a color center at the W5+ site, while the anodic reaction removes an electron from the color center W5+ state. Raman spectroscopy indicated that for the colored state, the frequency for the W-O bond stretching mode increased, while for the WO bonds it decreased. © 2002 American Institute of Physics.||Source Title:||Journal of Applied Physics||URI:||http://scholarbank.nus.edu.sg/handle/10635/82259||ISSN:||00218979||DOI:||10.1063/1.1424053|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 31, 2021
WEB OF SCIENCETM
checked on Jul 23, 2021
checked on Aug 2, 2021
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.