Silver doped copper oxide (Ag0.5Cu0.75O) nanoparticles synthesized by hydrothermal growth process were introduced into PVA matrix in varying amounts viz., 0.5, 1.0, 2.0 and 4.0 wt% through solution intercalation method. The Ag0.5Cu0.75O nano filler induced structural and morphological changes in PVA were ascertained through X-ray diffraction and scanning electron microscopic analysis. While, the changes in optical and electrical behaviors such as optical band gap, refractive index, extinction co-efficient and current (I)–voltage (V) characteristics were established by various state of the art opto-electronic characterizations. The sensor performance was put through its pace by measuring the changes in current output of the composite films upon Escherichia coli exposure. The I–V measurements depicted 2 wt% as the optimum concentration of Ag0.5Cu0.75O nano fillers in PVA that achieved a device sensitivity of 23.85% for an E.Coli concentration of 1.25 × 108 cfu/ml. Under optimized conditions, the 2 wt% Ag0.5Cu0.75O/PVA based E.Coli sensor exhibited a lower detection limit of 102 cfu/ml and a response time of 6–8 s. The as prepared E.Coli sensor presents lower detection limit and lesser response time to be used for real-time operations.
Journal of Materials Science: Materials in Electronics – Springer Journals
Published: May 22, 2017
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