The present invention relates to a (nano)material comprising at least one inorganic and/or organomineral layer, integrated into which is at least one type of organic or organometallic fluorescent nanocrystal that emerges from the surface of said layer so that at least one part of the fluorescent nanocrystals is in direct contact with the outside environment. These emerging nanocrystals constitute, due to their fluorescence, a signalling function, and they may thus be functionalised by grafting a biomolecule bearing a probe function, such as a half-strand of DNA, to thus produce a biochip, biocaptor or biosensor comprising such a (nano)material, a support for a biochip, biocaptor or biosensor, and a method for preparing such a nanomaterial.