Synthesis and functionalization study of hierarchical ZnO nanowires for potential nitroaromatic sensing applications |
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Authors: | Anurag Gupta Bruce C Kim Eugene Edwards Christina Brantley Paul Ruffin |
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Institution: | 1. The University of Alabama, 101 Houser Hall, Tuscaloosa, AL, 35487, USA 2. U.S. Army, RDECOM/AMRDEC, 5400 Fowler Road, Redstone Arsenal, AL, 35898, USA
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Abstract: | In this work, we synthesize hierarchical ZnO nanowires in a customized atmospheric CVD furnace and investigate their surface modification behavior for prospective nitroaromatic sensing applications. The morphology and crystal structure of pristine nanowires are characterized through FE-SEM, TEM, X-ray diffraction and EDAX studies. Photoluminescence behavior of pristine nanowires is also reported. Surface modification behavior of synthesized nanowires on a ZnO–oleic acid system is studied by utilizing Raman and FT-IR spectroscopy. Based on these findings, 1-pyrenebutyric acid (PBA) has been identified as an appropriate fluorescent receptor for sensing p-nitrophenol. Fluorescence quenching experiments on a PBA–p-nitrophenol system are reported and a detection limit of up to 28 ppb is envisaged for PBA-grafted ZnO nanowire-based optical sensor. |
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