By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Photocatalytics. According to news originating from Zurich, Switzerland, by NewsRx correspondents, research stated, "Self-assembled monolayers of alkylthiolates on gold and alkylsilanes on silicon dioxide have been patterned photocatalytically on sub-100 nm length-scales using both apertured near-field and apertureless methods. Apertured lithography was carried out by means of an argon ion laser (364 nm) coupled to cantilever-type near-field probes with a thin film of titania deposited over the aperture."
Our news journalists obtained a quote from the research from the Swiss Federal Institute of Technology, "Apertureless lithography was carried out with a helium cadmium laser (325 nm) to excite titanium-coated, contact-mode atomic force microscope (AFM) probes. This latter approach is readily implementable on any commercial AFM system. Photodegradation occurred in both cases through the localized photocatalytic degradation of the monolayer. For alkanethiols, degradation of one thiol exposed the bare substrate, enabling refunctionalization of the bare gold by a second, contrasting thiol. For alkylsilanes, degradation of the adsorbate molecule provided a facile means for protein patterning. Lines were written in a protein-resistant film formed by the adsorption of oligo(ethylene glycol)-functionalized trichlorosilanes on glass, leading to the formation of sub-100 nm adhesive, aldehyde-functionalized regions."
According to the news editors, the research concluded: "These were derivatized with aminobutylnitrilotriacetic acid, and complexed with Ni2+, enabling the binding of histidine-labeled green fluorescent protein, which yielded bright fluorescence from 70-nm-wide lines that could be imaged clearly In a confocal microscope."
For more information on this research see: Photocatalytic Nanolithography of Self-Assembled Monolayers and Proteins. ACS Nano, 2013;7(9):7610-7618. ACS Nano can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; ACS Nano - www.pubs.acs.org/journal/ancac3)
The news correspondents report that additional information may be obtained from E. Ul-Haq, ETH, Dept. of Mat, Lab Surface Sci & Technol, CH-8093 Zurich, Switzerland. Additional authors for this research include S. Patole, M. Moxey, E. Amstad, C. Vasilev, C.N. Hunter, G.J. Leggett, N.D. Spencer and N.H. Williams (see also Photocatalytics).
Keywords for this news article include: Zurich, Switzerland, Europe, Amino Acids, Emerging Technologies, Nanolithograph,Nanolithography, Nanotechnology, Peptides, Photocatalyst, Photocatalytic, Photocatalytics, Proteins
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