Abstract: A colorimetric sensor for detecting bacteria and/or viruses includes one or more layers having a photonic crystal structure, a functional layer comprising a nanomaterial capable of generating bacteria- and/or viruses-bioresponsive surface plasmon overlapping the one or more layers having the photonic crystal structure. The bacteria- and/or viruses-bioresponsive nanomaterial of the functional layer is doped with proteinic substances or antibodies acting as virus receptors, or the colorimetric sensor comprises a receptor layer comprising proteinic substances or antibodies acting as virus receptors. The functional layer and receptor layer overlap each other. Alternatively, or in addition to, the colorimetric sensor comprises a plasmonic nanostructured layer comprising nanostructures such to generate plasmonic colors, overlapping the one or more layers having the photonic crystal structure.

Abstract: A colorimetric sensor for detecting bacteria and/or includes one or more layers having a photonic crystal structure a functional layer comprising a nanomaterial capable of generating bacteria- and/or viruses-bioresponsive surface plasmon overlapping the one or more layers having the photonic crystal structure. The bacteria- and/or viruses-bioresponsive nanomaterial of the functional layer is doped with proteinic substances or antibodies acting as virus receptors, or the colorimetric sensor comprises a receptor layer comprising proteinic substances or antibodies acting as virus receptors. The functional layer and receptor layer overlap each other. Alternatively, or in addition to, the colorimetric sensor comprises a plasmonic nanostructured layer comprising nanostructures such to generate plasmonic colors, overlapping the one or more layers having the photonic crystal structure.

Abstract: The present invention refers to a safety device (1) for authorizing an operation, comprising: a supporting structure (2); a color-shift structure (5) coupled to the supporting structure (2) on a side or face of this latter; a first safety string (6) made in the supporting structure (2) and disposed on said side or face of the supporting structure (2) so that the first safety string (6) and color-shift structure (5) are overlapped on each other; a second safety string (7) made in the supporting structure (2) and disposed on said side or face of the supporting structure (2) so that the second safety string (7) and color-shift structure (5) are overlapped on each other. The present invention refers also to a safety method and system for authorizing an operation exploiting such safety device.