聚(N-[3-(二甲基氨基)丙基]甲基丙烯酰胺)对CO2的长期暴露电响应,ACS Omega

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聚(N-[3-(二甲基氨基)丙基]甲基丙烯酰胺)对CO2的长期暴露电响应
ACS Omega ( IF 3.7 ) Pub Date : 2022-06-22 , DOI: 10.1021/acsomega.2c00914
Zahra Shahrbabaki ₁ , Farshad Oveissi ₁ , Syamak Farajikhah _{1,

2} , Mohammad B Ghasemian ₃ , Ross D Jansen-van Vuuren ₄ , Philip G Jessop ₅ , Jimmy Yun _{3,

6} , Fariba Dehghani _{1,

2} , Sina Naficy ₁

Affiliation

胺官能化聚合物 (AFP) 能够与二氧化碳 (CO ₂ ) 反应，因此可用于 CO ₂捕获和传感。要开发基于 AFP 的 CO ₂传感器，关键是要长时间检查它们对 CO ₂的电响应，以便该设备可以始终用于测量 CO ₂浓度。为此，我们通过自由基聚合合成了聚( N- [3-(二甲基氨基)丙基]甲基丙烯酰胺)(pDMAPMAm)，并测试了它在传感器中作为CO _{2响应聚合物的能力。}这种聚合物对 CO _{2的电响应}在水相和固相中都测量了长时间的暴露时间。_{在存在各种浓度的 CO 2}的情况下，对与银电极一起印刷的 pDMAPMAm 薄膜进行的直流电阻测量测试揭示了两区域的电响应。在连续暴露于不同的 CO ₂流速（在 0.2 MPa 的恒定压力下）时，阻力首先随时间降低，达到最小值，然后随着进一步暴露于 CO ₂逐渐增加。当将CO ₂引入pDMAPMAm的水溶液中时，观察到类似的趋势。pH 的原位监测表明 pDMAPMAm 的电阻变化可归因于在 CO 存在下叔胺基团的质子化₂ . pDMAPMAm 的这种双区域响应基于质子跳跃机制和当 pDMAPMAm 暴露于不同水平的 CO ₂时游离胺数量的变化。

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Electrical Response of Poly(N-[3-(dimethylamino)Propyl] Methacrylamide) to CO2 at a Long Exposure Period

Amine-functionalized polymers (AFPs) are able to react with carbon dioxide (CO₂) and are therefore useful in CO₂ capture and sensing. To develop AFP-based CO₂ sensors, it is critical to examine their electrical responses to CO₂ over long periods of time, so that the device can be used consistently for measuring CO₂ concentration. To this end, we synthesized poly(N-[3-(dimethylamino)propyl] methacrylamide) (pDMAPMAm) by free radical polymerization and tested its ability to behave as a CO₂-responsive polymer in a transducer. The electrical response of this polymer to CO₂ upon long exposure times was measured in both the aqueous and solid phases. Direct current resistance measurement tests on pDMAPMAm films printed along with the silver electrodes in the presence of CO₂ at various concentrations reveal a two-region electrical response. Upon continuous exposure to different CO₂ flow rates (at a constant pressure of 0.2 MPa), the resistance first decreased over time, reaching a minimum, followed by a gradual increase with further exposure to CO₂. A similar trend is observed when CO₂ is introduced to an aqueous solution of pDMAPMAm. The in situ monitoring of pH suggests that the change in resistance of pDMAPMAm can be attributed to the protonation of tertiary amine groups in the presence of CO₂. This two-region response of pDMAPMAm is based on a proton-hopping mechanism and a change in the number of free amines when pDMAPMAm is exposed to various levels of CO₂.

更新日期：2022-06-22

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