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Electrohydrodynamic impulse printing PANI sensor for NH3 gas

Electrohydrodynamic impulse printing is utilized to fabricate polyaniline droplets from protonic acid doped polyaniline, which can be composed to form lines as micro NH3 sensing elements. The effect of applied voltage, voltage frequency and voltage duty ratio on pattern size is investigated. The results show the size decreases with the frequency and voltage, but increases with the duty ratio. A minimum width line of 92 µm is obtained when applied voltage, voltage frequency, duty ratio, nozzle tip to substrate distance and flow rate are set to be 2450 V, 40%, 70 Hz, 1 mm and 100 µl/h, respectively. When exposed to NH3 gas, electrohydrodynamic printed polyaniline lines have a rapid response time to NH3. A minimum concentration of about 300 ppm of NH3 can be detected.