TY - JOUR
T1 - Simultaneous reduction and electrode patterning of TiO2/GO films via femtosecond laser for UV-enhanced flexible CO gas sensors
AU - Chen, Yuan Jun
AU - Chang, Tien Li
AU - Tseng, Shih Feng
AU - Hsiao, Wen Tse
AU - Hsu, Shu Han
N1 - Publisher Copyright:
© 2026
PY - 2026/8/15
Y1 - 2026/8/15
N2 - Reliable and sensitive gas sensors are essential for ensuring industrial safety and environmental monitoring. In this study, a flexible carbon monoxide (CO) gas sensor based on titanium dioxide (TiO2) and reduced graphene oxide (rGO) composite was developed for rapid and highly sensitive detection. The device was fabricated using one-step femtosecond laser (Fs-laser) processing, which simultaneously reduced a TiO2/graphene oxide (GO) thin film and patterned electrodes directly on a flexible substrate. Optimized laser parameters, including a repetition rate of 100 kHz, a scanning speed of 50 mm/sec, and a fluence of 0.34 J/cm2, enabled efficient film reduction and ensured reliable device performance. The sensor exhibited an initial response of 39.6% to CO gas at room temperature (25 °C), which was further enhanced to a maximum response of 43.8% under ultraviolet (UV) irradiation. Under 365 nm UV irradiation, the photocatalytic activity of TiO2 induced a substantial reduction in overall resistance, significantly improving the sensing capability. These findings demonstrate the potential of TiO2/rGO composite in UV-enhanced flexible CO gas sensors, and provide a promising strategy to improve sensitivity, selectivity, and stability in gas sensing applications.
AB - Reliable and sensitive gas sensors are essential for ensuring industrial safety and environmental monitoring. In this study, a flexible carbon monoxide (CO) gas sensor based on titanium dioxide (TiO2) and reduced graphene oxide (rGO) composite was developed for rapid and highly sensitive detection. The device was fabricated using one-step femtosecond laser (Fs-laser) processing, which simultaneously reduced a TiO2/graphene oxide (GO) thin film and patterned electrodes directly on a flexible substrate. Optimized laser parameters, including a repetition rate of 100 kHz, a scanning speed of 50 mm/sec, and a fluence of 0.34 J/cm2, enabled efficient film reduction and ensured reliable device performance. The sensor exhibited an initial response of 39.6% to CO gas at room temperature (25 °C), which was further enhanced to a maximum response of 43.8% under ultraviolet (UV) irradiation. Under 365 nm UV irradiation, the photocatalytic activity of TiO2 induced a substantial reduction in overall resistance, significantly improving the sensing capability. These findings demonstrate the potential of TiO2/rGO composite in UV-enhanced flexible CO gas sensors, and provide a promising strategy to improve sensitivity, selectivity, and stability in gas sensing applications.
KW - Femtosecond laser
KW - Flexible CO gas sensor
KW - Laser-induced technology
KW - TiO/rGO composite
UR - https://www.scopus.com/pages/publications/105036449208
UR - https://www.scopus.com/pages/publications/105036449208#tab=citedBy
U2 - 10.1016/j.apsusc.2026.166898
DO - 10.1016/j.apsusc.2026.166898
M3 - Article
AN - SCOPUS:105036449208
SN - 0169-4332
VL - 737
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 166898
ER -