Magnetic gas sensing exploiting the magneto-optical Kerr effect on ZnO nanorods/Co layer system

Year: 2016

Authors: Ciprian R., Baratto C., Giglia A., Koshmak K., Vinai G., Donarelli M., Ferroni M., Campanini M., Comini E., Ponzoni A., Sberveglieri G.

Autors Affiliation: Univ Brescia, Dept Informat Engn, SENSOR Lab, Via Branze 45, I-25133 Brescia, Italy; Univ Brescia, CNR INO, Dept Informat Engn, SENSOR Lab, Via Branze 45, I-25133 Brescia, Italy; CNR, IOM, Ss 14 Km 163-5, I-34149 Trieste, Italy; CNR, IMEM, Parco Area Sci 37-A, I-43124 Parma, Italy; Elettra Sincrotrone Trieste, Ss 14 Km 163-5, I-34149 Trieste, Italy.

Abstract: A new system based on a Co film covered by ZnO nanorods (NRs) has been fabricated with sputtering technique. Its stability and magneto-optical properties are suitable for magnetic gas sensing applications. The tests have been performed at room temperature exploiting a magneto-optical Kerr effect magnetometer using H-2 and CO as target gases. The reaction process is affected by a thin interface constituted by Co-doped ZnO. The surface of ZnO NRs and the interface are the sensing elements of the sensor, while Co acts as a magnetic transducer. The sensor is sensitive, stable and fast as concern both the response and the recovery time. The used system for gas detection can be easily reduced in size allowing the development of a low-cost and portable sensor.

Journal/Review: RSC ADVANCES

Volume: 6 (48)      Pages from: 42517  to: 42521

More Information: We acknowledge the Ceric-Eric (Central European Research Infrastructure Consortium) and Elettra synchrotron (Trieste, Italy) for allowing and funding, through a proposal, the TEM measurements at the National Institute of Material Physics in Bucharest. The XAS-XMCD spectra were carried out with Proposals No. 20155119 at Elettra synchrotron.
KeyWords: OPTICAL-PROPERTIES; SEMICONDUCTORS; NANOSTRUCTURES; FERROMAGNETISM; SENSORS; OXIDES; FILM
DOI: 10.1039/c6ra00522e

Citations: 16
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