4. งานวิจัยที่เกี่ยวข้อง Zhe Jin (2001) reported that they have presented an optical ammonia gas sensor based on a polyaniline film prepared by chemical oxidation. The film shows significant spectroscopic changes upon exposure to ammonia gas at room temperature. The new sensor effectively eliminates the limitations associated with the current conducting polymer gas sensors, which are based on conductivity measurements
5. Debarnot(2003) reported that Polyaniline appears to be a good candidate to realize gas sensors because of its sensitivity at room temperature, its easy of synthesis by various methods and its low cost. At present, the trend seems to be the use of composite with polyaniline as the sensitive layer. As for the transduction mode, the measurement of dc resistivity variations is the most used technique to monitor the gas adsorption on polyaniline. However, parameters like response time and selectivity of resistive gas sensors remain to be improved. The measurement of threshold voltage variations, optical or electrochemical parameters under gas flow present several advantages compared to that of resistivity. งานวิจัยที่เกี่ยวข้อง (2)
6. งานวิจัยที่เกี่ยวข้อง (3) Prasad(2005) Reported that they have synthesized a water soluble, polyelectrolyte(PSSM) templated PANI from which good quality spin-cast films are fabricated. The ammonia sensing capability of the thin films are investigated and the optimal film characteristics are established. A 5-layer spin-coated film is found to be the most suitable system. The PANI–PSSM sensor exhibits stable, reproducible and reversible resistance changes in presence of ammonia in the 5–250 ppm range. The response and recovery times are quite short, in the range 50–1000 s depending on the ammonia concentration. Response at 150 s is shown to vary linearly with ammonia concentrations in this range