Polyacrylic acid partial sodium salt solution (PAAPSS) can be used to fabricate humidity sensors as it is super hydrophilic in nature and can adsorb the maximum number of available water molecules onto the active layer. The addition of PAAPSS significantly improved sensitivity while maintaining stability.
Polyacrylic acid metasodium salt (PAASS) is super hydrophilic and very sensitive to environmental humidity percentage, so it can be used to prepare highly sensitive and high-performance humidity sensors. Preparation of PAASS-based sensors · The ink for active layer was prepared by dissolving 1% wt/vol. BEHP-co-MEH:PPV in chloroform solvent. The mixture was put on bath sonicator at 30ºC for 60 minutes and was then kept on magnetic stirrer for 2 hours. · The powder of PAAPSS was ground to reduce the particle size that will allow uniform dispersion in the composite ink. PAAPSS powder was added to the BEHP-co-MEH:PPV solution in three different weight by volume ratios of 1%, 3%, and 5%. · Then, the Ycut LiNbO3 wafer is used as the substrate, and the electrode is prepared through washing, UV ozone plasma treatment and reverse offset printing technology. The active layer of the composite was then deposited on the electrode using conventional spin-coating techniques.
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Sajid M,et al. Sensors and Actuators B: Chemical, 2017, 246: 809-818.
