Original ResearchPublished 2 July 2026Cationic metal detection using an Al–Al 2 O 3 nanoengineered SPR sensorTalia Tene · Paulina Elizabeth Valverde Aguirre · Geoconda Marisela Velasco Castelo · Melvin Arias Polanco · Lala Gahramanli · Lorenzo S. Caputi · Salvatore Straface · Cristian Vacacela GomezFrontiers in Nanotechnologydoi 10.3389/fnano.2026.1786421