To measure the concentration of dissolved carbon dioxide

using the material NiO which is sensing to CO

2

at room temperature

a novel all-solid-state dissolved CO

2

sensor was developed based on the carbon-paste film forming.In this paper

the sensor structure and the sensing mechanism of NiO to CO

2

were discussed.And the response characteristics of Δ

V

rs

(the reference voltage shift) versus the dissolved CO

2

concentration which were bound at different biases and different temperatures were given.The experimental results show that the dissolved carbon sensor based on the MISFET structure with Pt-NiO mixed sensing film is feasible to determine the concentration

of dissolved CO

2

at room temperature.