Sensors metal-oxide nanoparticle

Compact chemical sensors can be broadly classified as being based on electronic or optical readout mechanisms [28]. The electronic sensor types would include resistive, capacitive, surface acoustic wave (SAW), electrochemical, and mass (e.g., quartz crystal microbalance (QCM) and microelectromechanical systems (MEMSs)). Chemical specificity of most sensors relies critically on the materials designed either as part of the sensor readout itself (e.g., semiconducting metal oxides, nanoparticle films, or polymers in resistive sensors) or on a chemically sensitive coating (e.g., polymers used in MEMS, QCM, and SAW sensors). This review will focus on the mechanism of sensing in conductivity based chemical sensors that contain a semiconducting thin film of a phthalocyanine or metal phthalocyanine sensing layer. 

The main focus of the application of metal and metal oxide nanoparticles encompasses optoelectronic devices, sensor applications, and data storage. However, to a chemist it is the field of catalysis that has greatly been revolutionized by the... 

M. Graf, A. Gurlo, N. Blrsan, U. Weimar, and A. Hierlemann. Microfabricated gas sensor systems with sensitive nanocrystalline metal-oxide films , Jom-nal of Nanoparticle Research (2006), 8, 823-839. 

It seems to be possible that most transition metal oxides can be made in porous crystals with different morphologies using various mesoporous silicas as templates. It is expected that these materials have potential in applications such as catalysis, fuel cell, gas sensors and Li-batteries. Their physical properties would fall in between nanoparticles and bulk specimens, although our knowledge about these properties is still very limited. 

Baraton M.-L, Metal oxide semiconductor nanoparticles for chemical gas sensors, lEEJ Trans. Sensors Micromach., 126, 553-559, 2006. 

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