2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Miniaturized Room-temperature Gas Sensors with Hybrid Nanostructures of SnO2 Nanocrystals Decorated on Multiwalled Carbon Nanotubes

G.H. Lu, J.H. Chen, L.E. Ocola
University of Wisconsin-Milwaukee, US

Keywords:
hybrid nanostructure, nanocrystal, carbon nanotube, gas sensing

Abstract:
The advent of various nanomaterials, including nanoparticles, nanotubes, and nanowires, and the advancement of micro-/nanofabrication technology have opened up new opportunities for fabricating miniaturized gas sensors with improved performance. Hybrid nanostructures consisting of nanocrystals distributed on the surface of carbon nanotubes (CNTs) could potentially display not only the unique properties of nanocrystals and those of CNTs, but also additional novel properties. A facile dry route, electrostatic force directed assembly (ESFDA), has been developed to deposit aerosol SnO2 nanocrystals onto the external surface of multiwalled CNTs (MWCNTs). A novel gas sensor is fabricated with the SnO2 nanocrystal-MWCNT hybrid nanostructures and the sensor exhibits excellent capability to detect various low-concentration gases (NO2, CO, and H2) at room temperature. The sensing response time and recovery time of the sensor are on the order of a few minutes. The sensor displays linear responses when the NO2 concentration varies from a few to 100 ppm. The room-temperature sensing behavior could be attributed to the increased specific surface area of the hybrid nanostructure and the interaction between SnO2 nanocrystals and MWCNTs.


Nanotech 2008 Conference Program Abstract