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Pt/GaN devices operated as Schottky diodes were characterized for their hydrogen gas sensitivity. The sensors are tested at different concentrations of hydrogen gas as a function of operating temperature. The Pt thin film (100nm) was prepared and deposited by sputtering method. The electrical characterization was made using (I-V) current voltage of the temperatures range of 25 C to 500 C. Result shows the current output increased as operating temperature increases and decreased as temperature exceed 200 C. The maximum sensor sensitivity recorded in terms of current detected showed higher value than those obtained form Pt/Si and Pt/SiC sensor diode at similar temperature. Sensitivity also increases as the concentration of H2 gas increased. Further more, the sensor shows remarkable sensitivity stability and retained it at broad temperature range of 25 C up to 200 C.