Effect of humidity on NH3 gas sensitivity of polyaniline blend films

Preparation Poly 2-hydroxy aniline Thin Film by Chemical Bath Deposition Technique for Ammonia Vapor Sensor

“…Sensitivity can be calculated (S) from equation below [9]: S = (R g -R a ) / R a × 100% ……………. ( 5) R g : the electrical resistance of thin film in the case of the gas pump.…”

A peculiar cyclic voltammetric behavior of polyaniline in acetonitrile and its application in ammonia vapor sensor

“…9 that as the relative humidity is increased, the resistance is decreased monotonously for both types of PANI films, but the decreasing for the pretreated film is greater than that for the non-pretreated. It is known that when the hydrogen bonding capability of water to interact with polymer backbone itself or with donor molecules is primary, the polarization of electronic charge toward the adsorbed water molecule will result in the generation of additional free hole charge carriers which cause a net decrease in the resistivity [26]. The higher humidity sensitivity of the pretreated PANI film suggests that the deep reduction favors the formation of hydrogen bond between water molecular and imine nitrogen center in polymer chain, which is possibly associated with the weaker interactions between polymer chains due to the deep reduction.…”

Disposable electrochromic polyaniline sensor based on a redox response using a conventional camera: A first approach to handheld analysis

“…In a similar way, covering PANI films with a layer of silicone permits the determination of analytes in solution such as acetic acid and ammonia [15]. An optical gas sensing device for ammonia was developed using a LED-photodiode setup and a PANI layer deposited on glass [20] or on poly(methyl methacrylate) and polystyrene blend films [21]. A copolymer of aniline and anthranilic acid was used as the support for the immobilization of urease allowing the spectrophotometric determination of urea [22].…”