This study focuses on the fabrication of TiO2 nanosheets and their gas sensor application. A simple sonochemical method is employed to fabricate the TiO2 nanosheets. The obtained samples were investigated by transmission electron microscope(TEM) and X-ray Diffraction(XRD). The TiO2 nanosheets were coated on substrates by a dropping method followed by heat treatment. The sensor responses to volatile organic compounds(VOCs) such as toluene, benzene, ethanol and acetaldehyde were studied. It was found that the TiO2 nanosheets sensors are able to detect ppb-levels of VOC gases.