HIGH SENSITIVITY SENSORS

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Presentation transcript:

HIGH SENSITIVITY SENSORS Individual project Nanomaterials HIGH SENSITIVITY SENSORS Teacher: Cristina Felea Student: Cenan Marius Paul

INTRODUCTION Oxford English Dictionary defines the sensor as “a device that detects and records the conditions or properties, indicate or sometimes respond to information received”

Features: use area resolution (sensitivity) maximum stimulus frequency that can be detected (selectivity) accuracy (measurement error) sensor size and weight operating temperature and environmental conditions life long-term stability and cost

Use to measurement of: pressure distance movements speed acceleration force temperature chemical concentration

The sensor sensitivity can be improved by doping (changing the concentration) or by microstructural changes such as reducing the particle size to nanodimensions (5-50 nm), which improves the properties and performance of gas sensors due to increased surface area. OXIDE SEMICONDUCTOR FILMS USED AS GAS SENSORS FOR ENVIRONMENTAL MONITORING

Conductive films used as gas sensors Conductive materials used as gas sensors Material Working temperature (ºC) TiO2 700-1000 SrTiO3 Ga2O3 900-1000 Nb2O3 CeO2 BaFeNb9O10 720 BaTi2Nb4O25 BaFe0.8Hf0.2O3 400-800 Material Working temperature (ºC) SnO2 250-500 ZnO 400-500 TiO2 CeO2 400-600 Nb2O5 400 WO3 500 Ga2O3 550-600

Sensors based on oxide materials (SMO) report, evaluate and monitor the presence of gas chemical resistance and high temperature field that can be used

Network image of Tungsten oxide nanowires

PRELIMINARY RESULTS We investigated the behavior of several oxides and TiO2 has been the most extensively used in controlling air/fuel ratio in internal combustion engines. This oxide can also be used in wastewater purification.

NANODOCTORS IN 30 YEARS to provide medication tumor removers analysis and rebuild tissue destroyed by accident A nanorobot, able to administer poison only target bacteria, would greatly simplify things, “said Ottilie Saxl, chief executive of the U.S. Institute for Nanotechnology”.

REFERENCES: www.jnanobiotechnology.com/articles www.chimie.go.ro www.disclose.tv/action/viewvideo/3062/Nanotechnology__Nokia_Morph_Concept_2008 www.nanowerk.com/nanotechnology/research_news.php P. Tmoseley, J. O. W.Norris, D. E. Williams, Techniques and mechanisms in gas sensing, Adam Hilger, Bristol, 1991 . E. Williams, P. T. Moseley, J. Mater. Chem., 1, 809-825(1991) M. Kuwabara, T. Ide, Co gas sensivity in porous semiconducting barium titanate, Am. Ceramic Soc. Bull., 66, 1401-1405(1987) C. M. Chiu, Y. U. Chang, The structure, electrical and sensing properties for CO of the La0.8Sr0.2CO1-xNixO3- system, Mater. Sci. Eng. A, 266, 93-98(1999)

Thank you!