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In the present work, gas sensor was fabricated using nano-Titanium Dioxide (n-TiO2) and nano-Titanium Dioxide/ Reduced Graphene Oxide composite (n-TiO2/rGO). This H2S (2 ppm) gas sensor was evaluated under different temperatures (Room temperature (27 °C) - 200 °C) and achieved the high response at room temperature. The n-TiO2/rGO-3 sensor is high response (RS=43) due to rGO is covered between n-TiO2 and works like a bridge between the adjoining n-TiO2 particles, these properties to increase the electron transfer and enhance the gas adsorption properties. Also sensor was highly selective towards H2S (2 ppm) compared with various gases (CO, NH3, SO2, and H2)., response and recovery (7 s and 10 s), its long-term stability upto 10 days was studied and it was more stable. The properties of the R1 (grain bulk), R2 (grain boundaries) and Q2 (electrode-sensing film contact) was analyzed by impedance with equivalent circuit. Grain boundaries results was highly changed under H2S gas environment and it was analyzed by equivalent circuit-fitted values.