By a News Reporter-Staff News Editor at Journal of Technology -- Investigators discuss new findings in Applied Materials & Interfaces. According to news reporting out of Taipei, Taiwan, by VerticalNews editors, research stated, "Poly(N-isopropylacrylamide) microgels (PNIPAM MGs) incorporated with photoluminescent gold nanodots (Au NDs) have been prepared and employed for the detection of mercury ions (Hg(2+)). Each of the PNIPAM MGs (hydrodynamic diameter 615 ± 15 nm) contains several Au NDs (diameter 1.8 ± 0.2 nm) in the Au ND-PNIPAM MGs."
Our news journalists obtained a quote from the research from National Taiwan University, "Like Au NDs, Au ND-PNIPAM MGs exhibit an absorption band at 375 nm that is assigned for ligand to metal charge transfer mixed with metal centered (ds/dp) states and photoluminescence at 520 nm originated from Au ND/polynuclear gold(I)-thiolate (core/shell) complexes. Purification of Au ND-PNIPAM MGs relative to Au NDs is much easier through a simple centrifugation/wash process. On the basis of Hg(2+)-induced photoluminescence quenching due to the formation of Au-Hg amalgam and formation of Au ND-PNIPAM MGs aggregates, the signal response of Au ND-PNIPAM MGs against Hg(2+) concentration is linear over a range from 2 to 20 nM (r=0.9945). This selective approach provides limits of detection for Hg(2+) (at a signal-to-noise ratio of 3) of 1.9 and 1.7 nM in phosphate buffer solutions (5 mM, pH 7.0) with and without containing 500 mM NaCl, respectively."
According to the news editors, the research concluded: "This selective and sensitive Au ND-PNIPAM MG probe has been applied to the determination of the concentration of Hg in a representative fish sample, showing its practical potential for monitoring of Hg levels in complicated biological and environmental samples."
For more information on this research see: Synthesis of photoluminescent Au ND-PNIPAM hybrid microgel for the detection of Hg2+. Acs Applied Materials & Interfaces, 2013;5(10):4383-8. (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 L.Y. Chen, Dept. of Chemistry, National Taiwan University, Taipei 10617, Taiwan. Additional authors for this research include C.M. Ou, W.Y. Chen, C.C. Huang and H.T Chang.
Keywords for this news article include: Asia, Taipei, Taiwan, Applied Materials & Interfaces.
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC