By a News Reporter-Staff News Editor at Journal of Technology -- Research findings on Materials Science are discussed in a new report. According to news reporting from Singapore, Singapore, by VerticalNews journalists, research stated, "An analytical platform suitable for trace detection using a small volume of analyte is pertinent to the field of toxin detection and criminology. Plasmonic nanostructures provide surface-enhanced Raman scattering (SERS) that can potentially achieve trace toxins and/or molecules detection."
The news correspondents obtained a quote from the research from the Institute of Materials Research and Engineering, "However, the detection of highly diluted, small volume samples remains a challenge. Here, we fabricate a superhydrophobic SERS platform by assembling Ag nanocubes that support strong surface plasmon and chemical functionalization for trace detection with sample volume of just 1 mu L. Our strategy integrates the intense electromagnetic field confinement generated by Ag nanocubes with a superhydrophobic surface capable of analyte concentration to lower the molecular detection limit. Single crystalline Ag nanocubes are assembled using the Langmuir-Blodgett technique to create surface roughness. To create a stable superhydrophobic SEAS platform, an additional 25 nm Ag coating is evaporated over the Ag nanocubes to 'weld' the Ag nanocubes onto the substrate followed by chemical functionalization with perfluorodecanethiol. The resulting substrate has an advancing contact angle of 169 degrees +/- 5 degrees. Our superhydrophobic platform confines analyte molecules within a small area and prevents the random spreading of molecules. An analyte concentrating factor of 14-fold is attained, as compared to a hydrophilic surface. Consequently, the detection limit of our superhydrophobic SEAS substrate reaches 10(-16) M (100 aM) for rhodamine 6G using 1 mu L analyte solutions. An analytical SEAS enhancement factor of 10(11) is achieved."
According to the news reporters, the research concluded: "Our protocol is a general method that provides a simple, cost-effective approach to develop a stable and uniform superhydrophobic SERS platform for trace molecular sensing."
For more information on this research see: Superhydrophobic Surface-Enhanced Raman Scattering Platform Fabricated by Assembly of Ag Nanocubes for Trace Molecular Sensing. ACS Applied Materials & Interfaces, 2013;5(21):11409-11418. ACS Applied Materials & Interfaces can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; ACS Applied Materials & Interfaces - www.pubs.acs.org/journal/aamick)
Our news journalists report that additional information may be obtained by contacting H.K. Lee, ASTAR, Inst Mat Res & Engn, Singapore 117602, Singapore. Additional authors for this research include Y.H. Lee, Q. Zhang, I.Y. Phang, J.M.R. Tan, Y. Cui and X.Y. Ling.
Keywords for this news article include: Asia, Materials Science
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