Organic high-sensitive elements of gas sensors based on conducting polymer films

Polymer Sensitive Elements for Gas Sensors of Ammonia

“…2. In previous publications (Tsizh et al, 2009;Tsizh et al, 2014;Tsizh and Aksimentyeva, 2016; we have already reported about the change of optical absorption of PANI films under ammonia influence, in particular, about the fact that the most significant changes occur in the optical absorption spectral range 500 ... 700 nm and gas sensitivity of film is defined exactly by this spectral range. It is logical to predict that the expansion of the spectral sensitivity region will lead to an increase of performance of gas sensors.…”

“…Among the numerous methods of obtaining thin polymer films, the most widespread are thermal evaporation, electrochemical deposition, dip-, drop-and spin-coating, Langmuir-Blodgett and layer-by-layer technique, vapor deposition polymerization and other (Reemts et al, 2004;Athawale et al, 2006;Nohria et al, 2006;Bai and Shi, 2007;Tsizh and Aksimentyeva, 2016). For obtaining layers of PANI and PЕDOT on the transparent surface we used method of electrochemical polymerization.…”

“…The films of oxides, as well as various inorganic and organic semiconductors have been exploited as sensitive elements in these sensors. In recent years, an interest in the use of polymer films (Reemts et al, 2004;McGovern et al, 2005;Sandberg et al, 2005;Kukla et al, 2005;Ameer and Adeloju, 2005;Ram et al, 2005;Xu et al, 2006;Nohria et al, 2006;Athawale et al, 2006;Bai and Shi, 2007;Tsizh and Aksimentyeva, 2016; sensitive to different gases increased due to the better adaptability, easiness of synthesis and use, lower cost, and in some cases better performance for the polymer films. Alternatively, despite of successful development and use of «artificial nose» systems and other gas-sensitive devices, there is high need of cheap portable sensors for operational observation of environmental and industrial processes, monitoring of gaseous media in food, especially, control of freshness for food (meat, fish, dairy and other products) in the process of the storage and other purposes.…”

“…Ones of the most perspective of them are optical gas sensors, and as a gassensitive material are well-proven thin films of conjugated polymers, in particular, layers of polyaniline (PANI) and poly-3,4-ethylenedioxythiophene (PEDOT) (Reemts et al, 2004;McGovern et al, 2005;Ram et al, 2005;Nohria et al, 2006;Xu et al, 2006;Bai and Shi, 2007). To date, the mechanisms of interaction of ammonia molecules with the organic polymer films PANI, PEDOT and their derivatives is proposed, the features of changes of their properties, including optical, under the action of ammonia are studied, the ways of their usage in industrial manufacturing devices are suggested and working model of optical ammonia sensors based on them are made (Bai and Shi, 2007;Tsizh et al, 2009;Tsizh et al, 2014;Tsizh and Aksimentyeva, 2016;. However, the needs of modern processing industries and other fields of human activity require constant improvement of operational parameters of gas sensors.…”

Poly(3,4-ethylenedioxythiophene) Electrosynthesis in the Presence of Mixtures of Flexible-Chain and Rigid-Chain Polyelectrolytes

“…PANI is more popular among CP sensing layers due to the very high rate and amplitude of the optical response on ammonia action [23,25]. In the studies [25,26], it was shown that PANI/PEDOT bilayer structures have a higher sensitivity to ammonia due to their wider spectral region than for individual PANI. The authors in [27] report that the detection limit of the bilayer PANI/PEDOT was 7.86 ppm with a response time of 2.33 min.…”