CORDIS provides links to public deliverables and publications of HORIZON projects.
Links to deliverables and publications from FP7 projects, as well as links to some specific result types such as dataset and software, are dynamically retrieved from OpenAIRE .
Exploitable results
In terms of prototypes, the two main technological objectives are the optimization of a BaTiO3-based CO2 sensor and the improvement over Japanese sensors of SnO2-based devices capable of detecting CO, CxHy, NOx and H2 gases. A higher sensitivity of the CO2 sensors (ideal target: 2 at 100 ppm) and a higher selectivity of SnO2-based sensors (minimum improvement factor: 2) are requested. Moreover, for both types of sensors a reduction of the power consumption and a reduction of the cross-sensitivity to humidity are important requirements.
At the end of the SMOGLESS project, it can be concluded from the results obtained by the Consortium that:
a versatile and high-throughput method for nanosized powder synthesis has been developed including a convenient FTIR spectrometric method for nanoparticle surface quality control.the use of nanoparticles instead of microparticles in the fabrication of gas sensors significantly enhances the sensitivity of the devices the nano-BaTiO3-based sensors offer a much higher sensitivity to CO2 (improvement factor > 10 at 10% v/v) than that exhibited by the first prototype based on microparticles at an operating temperature of 550°C. Moreover, a new design of the substrates has significantly decreased the power consumption of the device by a factor 5 to 10.the improved micro-BaTiO3-based sensors offer a higher sensitivity to CO2 (improvement factor ~ 2 at 10% v/v) than that exhibited by the first prototype at an operating temperature of 550°C. These devices show a longer lifetime than the nano-BaTiO3 based sensors. Thick-film planar sensors based on nanocrystalline SnO2 are capable of detecting NO, NO2, CO, H2 and CH4 with ppm (and eventually sub-ppm) resolution. The inherent cross-sensitivity to water vapour of these devices has been reduced in the case of CH4 sensors. These sensor prototypes (NO and NO2 sensors in particular) exhibit a gas sensitivity much higher than that of commercial devices, which makes them potentially attractive for commercial applications. Improved dopant/n-SnO2 mixing leads to sensors having significantly higher sensitivities to H2, CO and CH4 with sub-50°C operating temperature in the case of CO sensors.
In terms of scientific objectives, significant progresses have been made towards a detailed understanding of the fundamental gas sensing mechanisms through surface characterization, powerful material porosity/gas diffusion modelling and electrical response modelling. The resulting data made it possible to find the suitable parameters for sensor heat-treatments and to indicate additional catalysts for gas sensing improvements.
The scientific work carried out during this basic research project made it possible to significantly advance the understanding and exploitation of the unique properties of nanostructured materials. The research area of nanostructured materials is considered by international experts as one of the most promising area in the field of new materials and has attracted major interest in Japan and in the U.S.A. where considerable funds have been recently allocated to. This project has contributed to strengthen the international scientific base of the academic partners and to open commercial prospects to the industrial partners.
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