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Effect of pH on the properties of protonated polyaniline-based films for pH sensing applications
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-01-19 , DOI: 10.1002/app.55110 Qi Kang 1 , Hiroaki Takehara 1 , Takanori Ichiki 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-01-19 , DOI: 10.1002/app.55110 Qi Kang 1 , Hiroaki Takehara 1 , Takanori Ichiki 1
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The chemical and physical properties of protonated polyaniline (PANI)-based films, including PANI-emeraldine salt (ES) and PANI/polyvinyl acetate (PVAc) films, before and after pH treatments are characterized and compared. Protonated PANI-based films are prepared by spin coating. The effects of pH value and immersion time on the film properties are investigated to gain a better understanding of their performance in pH sensing. The films are characterized based on color, morphology, chemical structure, phase state, and protonation state. Protonated PANI-based films exhibit a color change from green to dark blue as deprotonation occurs in solutions with higher pH. The highly porous structure of PANI/PVAc films is slightly affected by the pH of the solution. However, the globular structure of the PANI-ES films forms cracks with increasing immersion time. PANI/PVAc films exhibit better stability in acidic and neutral solutions than in alkaline solutions because of the hydrolysis of PVAc. Compared with the negligible differences in the PANI/PVAc film in buffers with different pH, PANI-ES exhibits noticeable changes. Therefore, PVAc improves the stability and performance of PANI for pH-sensing applications.
中文翻译：
pH 对 pH 传感应用中质子化聚苯胺基薄膜性能的影响
对质子化聚苯胺 (PANI) 薄膜（包括 PANI-翠绿亚胺盐 (ES) 和 PANI/聚醋酸乙烯酯 (PVAc) 薄膜）在 pH 处理前后的化学和物理性质进行了表征和比较。通过旋涂制备质子化聚苯胺基薄膜。研究了 pH 值和浸泡时间对薄膜性能的影响，以更好地了解其在 pH 传感方面的性能。这些薄膜根据颜色、形态、化学结构、相态和质子化状态进行表征。当 pH 值较高的溶液中发生去质子化时，质子化的 PANI 薄膜呈现出从绿色到深蓝色的颜色变化。PANI/PVAc 薄膜的高度多孔结构受溶液 pH 值的影响轻微。然而，随着浸泡时间的增加，PANI-ES 薄膜的球状结构会形成裂纹。由于 PVAc 的水解，PANI/PVAc 薄膜在酸性和中性溶液中比在碱性溶液中表现出更好的稳定性。与不同 pH 缓冲液中 PANI/PVAc 薄膜的微小差异相比，PANI-ES 表现出明显的变化。因此，PVAc 提高了 PANI 在 pH 传感应用中的稳定性和性能。
更新日期：2024-01-19
中文翻译：
pH 对 pH 传感应用中质子化聚苯胺基薄膜性能的影响
对质子化聚苯胺 (PANI) 薄膜（包括 PANI-翠绿亚胺盐 (ES) 和 PANI/聚醋酸乙烯酯 (PVAc) 薄膜）在 pH 处理前后的化学和物理性质进行了表征和比较。通过旋涂制备质子化聚苯胺基薄膜。研究了 pH 值和浸泡时间对薄膜性能的影响，以更好地了解其在 pH 传感方面的性能。这些薄膜根据颜色、形态、化学结构、相态和质子化状态进行表征。当 pH 值较高的溶液中发生去质子化时，质子化的 PANI 薄膜呈现出从绿色到深蓝色的颜色变化。PANI/PVAc 薄膜的高度多孔结构受溶液 pH 值的影响轻微。然而，随着浸泡时间的增加，PANI-ES 薄膜的球状结构会形成裂纹。由于 PVAc 的水解，PANI/PVAc 薄膜在酸性和中性溶液中比在碱性溶液中表现出更好的稳定性。与不同 pH 缓冲液中 PANI/PVAc 薄膜的微小差异相比，PANI-ES 表现出明显的变化。因此，PVAc 提高了 PANI 在 pH 传感应用中的稳定性和性能。
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