A pyrene-based simple fluorosensor has been synthesized by a one step process. It exhibited high selectivity towards Cu²⁺ ions via fluorescence enhancement of monomer and excimer emission. The origin of excimer formation was examined and established to be of static in nature from the study of absorption and excitation spectra. The observed monomer and excimer emission in the presence and absence of Cu²⁺ ion with varying pH was studied and provided probable justification. The effect of varying portions of water content in solvent on the sensor molecule was also examined. The sensor found its proper application in finding accurate and trace amount of Cu²⁺ ions present in drinking water samples from various sources. The detection limit of the current sensor was found to be 4 × 10⁻⁸ M.

Regardless of its location, our electronic equipment does not always escape the threats of electromagnetic interference (EMI). Unrestrained radio and microwave radiation from communication devices, broadcasting stations, power lines and other electric equipment constantly bombards us and our precise circuitry equipment. Although its effects on human beings have not yet been directly demonstrated, our electronic gadgets are not that fortunate. A plethora of research work has already been published in the search for a perfect shielding material. Studies in the last decade reveal that dielectric ceramics, magnetic oxides/ferrites/particles, semiconductors, metal particles/foams, intrinsically conducting polymers, conducting carbon black/fibers/nanotubes and other carbon derivatives such as graphene etc. have been widely researched. The particles are either embedded in a wax medium or in a thermoplastic matrix to design an effective shield. To this end, polymer-based nanocomposites have been much discussed owing to their technology-matching properties, light weight, ease of fabrication and adaption, lack of corrosion, and design flexibility. However, the high dosage of nanofillers needed to meet the requirements of an effective shield mars their utility in many respects. Although bi-phasic polymer blends have been researched from different perspectives, utilizing them as a template for microwave shielding is currently drawing enormous interest compared with single-polymer-based nanocomposites. This review highlights the stepwise advancement of bi-phasic polymer blends towards EMI shielding applications. We in this manner endeavor to provide a necessary overview and point out the direction in which future research will keep on thriving as this new class of material emerges as an effective EMI shield.