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Tripathy, Suraj Kumar,Woo, Ju Yeon,Han, Chang-Soo American Chemical Society 2011 ANALYTICAL CHEMISTRY - Vol.83 No.24
<P>We report a colorimetric system for the detection of HCl in aqueous environments using unlabeled gold nanoparticle (AuNP) probes. This nonaggregation-based detection system relies on the ability of chloro species to cause rapid leaching of AuNPs in an aqueous dispersion containing a strong oxidizing agent, such as HNO(3) or H(2)O(2). The leaching process leads to remarkable damping of the surface plasmon resonance peak of the AuNP dispersion. This method works only with AuNPs of a particular size (30 nm diameter). It is highly selective for HCl over several common mineral acids, salts, and anions. This simple and cost-effective sensing system provides rapid and simple detection of HCl at concentrations as low as 500 ppm (far below the hazard limit) in natural water systems.</P>
Trilochan Sahoo,Suraj Kumar Tripathy,Hwa-Soo Kim,전주원,Vasudevan Kannan,Myoung Kim,Mi-Hee Lee,유연태,이인환 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
Epitaxial ZnO thin film was grown on spinel (111) substrates by using a hydrothermal technique. The phase and the surface morphology of the ZnO thin fllms were studied by using X-ray diffaction and field emission scanning electron microscopy. The as-grown film was c-axis oriented and had a rough pitted surface morphology. The thickness of the film was found to depend greatly on the initial precursor concentration. Room-temperature photoluminescence measurements were carried out to study the optical properties of the as-grown epitaxial ZnO thin films. Band edge luminescence due to excitonic recombination and deep-level emission peaks were observed.