[en] Full text: ZnO is a n-type semiconductor widely studied for the excellent physicochemical properties that have made it a great prospect for application in different devices, from solar cells to detectors, it is usual to add dopants like Al to improve some properties. The ZnO is used in detectors as a transducer and often as a receiver making use of the defects that it presents (like the oxygen vacancies, grain size, and morphology) [1], in this work, it is used in both ways. On the other hand, the fluoroquinolones are antibiotics that have been detected in many water sources like rivers or waste effluents, are considered emerging contaminants and can induce bacterial resistance, being an interesting problem to know if the pollutant is present or not in an ecosystem and the concentration[2]. The ZnO particles are obtained by the sol-gel method, preparing a solution of zinc acetate dihydrate 0.5 M in ethanol and 1% of aluminum as aluminum nitrate nonahydrate, a thermal treatment was made at 550 °C for 1 h to eliminate residues of precursors. The structure identification agrees the zincite phase using x-ray diffraction and JADE software. The morphology was determined using scanning electron microscopy (SEM). Subsequently, the particles are suspended in deionized water, using a sonicator for 10 min to get the smallest particles as possible. A fluoroquinolone solution (with a concentration range from 1 to 30 ppm) is added to the ZnO suspension and it was kept in constant agitation. The detection of fluoroquinolones was made by fluorometry using an excitation of 325 nm and UVVis spectrophotometry. References [1]Ü.Özgür and D.Hofstetter, Proceedings of the IEEE 98, 1255 (2010); [2] N.Haruhiko and K.Kurunthachalam, Chemosphere 58, 759 (2005). (author)