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Three-Dimensional Clustered Nanostructures for Microfluidic Surface-Enhanced Raman Detection.
ACS Applied Materials & Interfaces 2016 September 22
A materials fabrication concept based on a fluid-construction strategy to create three-dimensional (3D) ZnO@ZnS-Ag active nanostructures at arbitrary position within confined microchannels to form an integrated microfluidic surface-enhanced Raman spectroscopy (SERS) system is presented. The fluid-construction process allowed facile construction of the nanostructured substrates, which were shown to possess a substantial number of integrated hot spots that support SERS activity. Finite-difference time-domain (FDTD) analysis suggested that the 3D clustered geometry facilitated hot spot formation. High sensitivity and good recycle performance were demonstrated using 4-mercaptobenzoic acid (4-MBA) and a mixture of Rhodamine 6G (R6G) and 4-MBA as target organic pollutants to evaluate the SERS microfluidic device performance. The 3D clustered nanostructures were also effective in the detection of a representative nerve agent and biomolecule. The results of this investigation provide a materials and process approach to the fabrication of requisite nanostructures for the online detection of organic pollutants, devices for real-time observation of environmental hazards, and personal-health monitoring.
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