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In this book chapter, we comment on the advantages of nanobiosensors using nanocrystals in the improving electrochemical sensors' response and their use as theragnostic tools in biomedical applications. The use of nanomaterials to modify electrochemical sensors' surfaces to increase these devices' sensitivity and their bio-functionality enables high-quality nanotechnological platforms. Thus, the results using graphene nanostructures and CdSe/CdS magic-sized quantum dots (MSQDs) to improve biosensors sensitivity were showed. In addition, the use of CdSe/CdS MSQDs and CoFe2O4 magnetic nanocrystals as potential tools for drug delivery systems and the use of biocompatible TiO2 nanocrystals in osseointegration processes and their bio-location are also demonstrated. So, this chapter shows some impressive results on which the group has been working regarding the applications of nanocrystals to electrochemical sensors and biomedical applications.

NanoBioSensors: From Electrochemical Sensors Improvement to Theranostic Applications