TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Nanomaterial: The film is a polymer film. The one or more nanocones are created from colloidal beads of size of few microns to a few tenths of nanometers. The nanomaterial is fabricated by introducing a monolayer of monodisperse polystyrene beads on top of the film and etching them with a single step oxygen plasma treatment. The nanomaterial further comprises coating to provide a physico-chemical characteristic and/or functionality. Preferred Method: The detection of multiple polynucleotides may be visualized by the naked eye. The detection of multiple polynucleotides is a result of complementary binding between single-stranded DNA (ssDNA)-modified AuNPs and ssDNA-modified nanometer sized cones. Preferred Components: The contaminant is a bacteria and/or pathogen, preferably food and/or crop pathogen. The contaminant is a hazardous compound. The contaminant is one or more performance enhancing compounds.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Device: The flexible nanomaterial has anti-reflective and/or hydrophobic properties. The micrometer and/or nanometer sized cones are Teflon (RTM: Polytetrafluoroethylene) cones. The flexible nanomaterial further comprises a polymer film and is coated with a material comprising metal, semiconductor, oxides, organic and/or inorganic compounds. The array serves as a biosensor for detection of multiple polynucleotides. The multiple polynucleotides include microRNA (miRNA) molecules. The detection of multiple polynucleotides can be visualized by the naked eye. The biosensor is adapted for portability and/or field testing. The biosensor is adapted for detection of bacteria, contaminated water, or pathogens in crops. The biosensor is adapted for detection of military hazards. The biosensor is adapted for detection of one or more performance enhancing compounds. The nanomaterial comprises one or more polynucleotides attached to a Teflon (RTM: Polytetrafluoroethylene) nanocone array in a configuration to be adsorbed to complementary polynucleotides modified by gold nanoparticles (AuNPs) from a target solution.