CuO-SnO

2

flower-like composite material are successfully fabricated through a facile one-step hydrothermal synthesis route. The structural and composition information are examined by means of X-ray diffractometer（ XRD）

field emission scanning electron microscopy（ FESEM）

and X-ray photoelectron spectroscopy（ XPS）. The result indicates that the obtained CuO-SnO

2

flower-like structure are assembled by a number of nanosheets of similar shapes and sizes

with diameters range of 2～ 5 μm. Content of CuO has no effect on SnO

2

flower-like structure. The obtained composite material is used to construc

t an indirectly heated gas sensor

and the sensitivity characteristics of the gas sensor to trimethylamine gas are tested by a static gas distribution method. The experimental results show that compared to pure SnO

2

sensor

CuO-SnO

2

senor displays high sensitivity

low detecting limit

good selectivity

and fast response and recovery to trimethylamine gas. The enhanced gas sensitive properties are probably attributed to the formation of p-n heterojunctions at interface and the catalytic characteristics of CuO.