This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Authors. The article duplicates significant parts of a paper that had already appeared in [Appl. Phys. Lett. 101, (2012) 112906. DOI: 10.1063/1.4750235] One of the conditions of submission of a paper for publication is that authors declare explicitly that the paper has not been previously published and is not under consideration for publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents a misuse of the scientific publishing system. The authors have reported this situation to The Journal of Supercritical Fluids and requested to retract this paper. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.