title: Optical microsensors for pesticides identification based on porous silicon technology.
abstract: A simple and low cost optical sensor, based on porous silicon nanotechnology, has been used to detect and quantify the presence of atrazine pesticide in water and humic acid solutions. In both cases, a well defined optical signal variation can be registered, even at low concentration as 1 ppm. The phenomenon can be ascribed to the capillary infiltration of liquid into the pores, which changes the average refractive index of the structure. Due to the resonant cavity enhanced operation of the proposed sensors, very low detection limits can be reached.
authors.affiliation: National Council of Research, Institute for Microelectronics and Microsystems, Via P. Castellino 111, 80131 Napoli, Italy. lucia.rotiroti@imm.cnr.it
authors.forename: Lucia
authors.initials: L
authors.lastname: Rotiroti
authors.forename: Luca
authors.initials: L
authors.lastname: De Stefano
authors.forename: Ivo
authors.initials: I
authors.lastname: Rendina
authors.forename: Luigi
authors.initials: L
authors.lastname: Moretti
authors.forename: Andrea Mario
authors.initials: AM
authors.lastname: Rossi
authors.forename: Alessandro
authors.initials: A
authors.lastname: Piccolo
mesh_terms: D001280:Atrazine / Q000032:analysis / Q000737:chemistry; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D002197:Capillary Action; D045424:Complex Mixtures / Q000032:analysis; D004785:Environmental Pollutants / Q000032:analysis*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006812:Humic Substances / Q000032:analysis*; D008904:Miniaturization; D055095:Optics and Photonics / Q000295:instrumentation*; D010575:Pesticides / Q000032:analysis* / Q000737:chemistry; D016062:Porosity; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods; D012825:Silicon / Q000737:chemistry*; D013672:Technology / Q000379:methods; D014159:Transducers; D014867:Water / Q000032:analysis / Q000737:chemistry*
chemical_list: D045424:Complex Mixtures; D004785:Environmental Pollutants; D006812:Humic Substances; D010575:Pesticides; D014867:Water; D001280:Atrazine; D012825:Silicon