High-Performance Capacitive Humidity Sensor Based on Cring-C3N4
Paper ID : 1071-ICNS
Sajjad Soltani *1, Shirin Nasresfahani2, Hossein Ashrafi3, Mohammad Hossein Sheikhi4
1School of Electrical and Computer Engineering,Shiraz University,Shiraz,Iran
2Department of Electrical Engineering, Golpayegan University of Technology, Golpayegan, Iran
3Department of Chemistry, College of Sciences, Shiraz University, Shiraz, Iran
4School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran
We developed a novel humidity sensor based on carbon ring- C3N4 heterostructure fabricated by a multi-heating-step strategy by using melamine and glucose as precursors. The morphology and structure of the prepared material were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy and field emission scanning electron microscopy. The analysis results indicated that the as-synthesized sample possesses a two-dimensional structure. The humidity sensing performance of the as-synthesized materials was evaluated by measuring the changes in capacitance magnitude when the humidity changes in the 20-90 %RH range. The diffusion of water molecules with high dielectric constant onto the sensing material increases the capacitance. The results revealed higher response and faster response/recovery times (40 s/ 5 s) of the carbon ring- C3N4 sensor than that of the g-C3N4 sensor. The admirable sensing property to humidity for this sensor can be attributed to its sheet-like morphology as well as more active sites to capture water molecules.
Humidity sensor; Capacitive; Carbon ring; Carbon nitride
Status : Abstract Accepted (Poster Presentation)