NOVELTY - Device comprises flexible nanomaterial comprising an array of micrometer and/or nanometer sized cones.    USE - The device is useful in other non-disease sensing applications, including detection of bacteria such as in contaminated water supply or pathogens in crops. The nanomaterial is used in biosensors, solar cells, self-cleaning surfaces and anti-reflective coating. The method (M1) is useful for fabricating an array of nanostructures on a flexible film. The method (M2) is useful for coating an object with a complex shape. The method (M3) is useful for diagnosing a disease, preferably cancer, heart disease, or neurodegenerative disease in an individual (all claimed).    ADVANTAGE - The device is cost-effective, enables earlier diagnosis of diseases, and fast and simple detection with the naked eye, profiles several miRNAs simultaneously, is portable device, does not make use of additional instrumentation, and advances global health efforts. The nanomaterial has one or more properties such as superhydrophobicity, anti-reflectivity, enhanced catalytic activity, and surface plasmon resonance activity.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) nanomaterial, comprising film configured for an array of one or more nanocones;    (2) method (M1) for fabricating an array of nanostructures on a flexible film, involves self-assembling a layer of particles on a film, and fabricating an array of nanostructures by etching and/or modifying the film;    (3) method (M2) for coating an object with a complex shape, involves providing an object with a complex shape and coating the object by fabricating an array of nanostructures on a flexible film on its surface;    (4) method (M3) for diagnosing a disease in an individual, involves obtaining a sample from an individual, assaying the sample by using a microarray device comprising a flexible nanomaterial comprising an array of micrometer and/or nanometer sized cones, and diagnosing the individual based on the detection of multiple polynucleotides;    (5) method (M4) for detecting a contaminant in a sample involves obtaining a sample, assaying the sample by using a microarray device comprising a flexible nanomaterial comprising an array of micrometer and/or nanometer sized cones and detecting the contaminant based on the detection of one or more polynucleotides; and    (6) portable device comprising nanocone surface in a microarray format with several spots to detect multiple substances simultaneously.