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Fabrication of nanostructure-based gas sensors which have high sensitivity,selectivity,stability and improved response and recovery time is one of the most significant branches of nanotechnology [1].Here we present a fast response toluene gas sensor based on Fe3O4 nanostructures,which are prepared via an ultrasonic solvothermal method.Nitrogen physisorption shows that the Fe3O4 nanostructures have large surface areas(63m2/g).The gas sensing properties of the Fe3O4 nanostructures were also investigated.