Guido Faglia

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We investigated the possibility of using several sensing parameters from porous silicon in order to improve gas selectivity. By fabricating porous silicon optical microcavities, three independent quantities can be measured, i.e. the electrical conductance, the photoluminescence intensity, and the wavelength of the optical resonance. We monitored the change(More)
Synthesis--particularly by electrochemical anodization-, growth mechanism and chemical sensing properties of pure, doped and mixed titania tubular arrays are reviewed. The first part deals on how anodization parameters affect the size, shape and morphology of titania nanotubes. In the second part fabrication of sensing devices based on titania nanotubes is(More)
This paper concerns the characterization and modeling of single crystal metal-oxide nanowires (e.g. SnO<inf>2</inf> and ZnO) used as CO sensors. In this work the performance of these devices when they are used with variable operating temperatures was taken into account. The aim was establishing a model to be used for the development of sensing systems(More)
Surface coating with an organic self-assembled monolayer (SAM) can enhance surface reactions or the absorption of specific gases and hence improve the response of a metal oxide (MOx) sensor toward particular target gases in the environment. In this study the effect of an adsorbed organic layer on the dynamic response of zinc oxide nanowire gas sensors was(More)
The present work reports on conductometric gas sensors based on metal oxide nanostructures developed in our laboratory in Brescia (Italy) showing their potentialities in term of sensitivity, selectivity and stability toward different molecules, including odorous compounds such as ammonia and hydrogen sulfide. The capability of these devices to discriminate(More)
The research and development of solid state gas sensors with low cost and reduced size for the monitoring of the gaseous species is rapidly increasing in the last years [1]. Many technological approaches have been proposed regarding the different materials and the detecting principles. The currently available sensors use several transduction principles:(More)
We tested the detection properties of four MOX sensors toward different ozone mixtures to identify sets of sensing layers and interfering compounds concentrations most suitable for a reliable detection of ozone. The measurement campaign lasted 1 year divided in four sessions. We collected a substantial amount of measurements (more than 500) with diverse(More)
The use of metal oxide single crystalline nanowires for chemical sensing of pollutant gases has been proposed as a reliable solution to ensure high sensor performance due to small size of the crystallites and good stability over long term operation at high temperature. To obtain enhanced sensing capabilities of ZnO nws, we prepared composite nanostructures(More)
A hybrid nanostructure based on reduced graphene oxide and ZnO has been obtained for the detection of volatile organic compounds. The sensing properties of the hybrid structure have been studied for different concentrations of ethanol and acetone. The response of the hybrid material is significantly higher compared to pristine ZnO nanostructures. The(More)