TY - JOUR
T1 - Electrochemical impedance spectroscopic investigation on detection of H2S gas using 2D TiO2/rGO nano-composites
AU - Balasubramani, V.
AU - Vignesh, R.
AU - Liu, Bo
AU - Sridhar, T. M.
PY - 2023
Y1 - 2023
N2 - In the present work, gas sensor was fabricated using nano-Titanium Dioxide (n-TiO2) and nano-Titanium Di-oxide/ Reduced Graphene Oxide composite (n-TiO2/rGO). This H2S (2 ppm) gas sensor was evaluated under different temperatures (Room temperature (27 degrees C) -200 degrees C) and achieved the high response at room temper-ature. 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.
AB - In the present work, gas sensor was fabricated using nano-Titanium Dioxide (n-TiO2) and nano-Titanium Di-oxide/ Reduced Graphene Oxide composite (n-TiO2/rGO). This H2S (2 ppm) gas sensor was evaluated under different temperatures (Room temperature (27 degrees C) -200 degrees C) and achieved the high response at room temper-ature. 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.
U2 - 10.1016/j.apsadv.2023.100415
DO - 10.1016/j.apsadv.2023.100415
M3 - Article
SN - 2666-5239
VL - 16
JO - APPLIED SURFACE SCIENCE ADVANCES
JF - APPLIED SURFACE SCIENCE ADVANCES
ER -