Qi Xin, Jin Wei, Tang Cao, Xiao Xue, Li Rui, Ma Yanqing, Ma Lei
Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin, 300072, People's Republic of China.
Tianjin Key Laboratory of Low-Dimensional Electronic Materials and Advanced Instrumentation, Tianjin, 300072, People's Republic of China.
Anal Sci. 2025 Feb;41(2):127-135. doi: 10.1007/s44211-024-00682-9. Epub 2024 Nov 2.
Graphene-based pH sensors, acclaimed for their exceptional sensitivity to environmental variations, have garnered significant interest in scientific research. However, the sensor performance in high ionic concentration environments is limited, due to the Debye length ion screening effect. In this study, an innovative graphene channel pH sensing device was developed and modified by cross-linked poly(methyl methacrylate) (PMMA). Furthermore, even in high ionic concentrations, the pH value can be precisely measured by this sensor. The sensor has remarkable sensitivity, and high response rate of - 70.49 mV/pH within the pH range from 7 to 10. Notably, the sensors retain uniform response direction and sensitivity under different ionic concentrations environmental and maintain consistent reversibility and stability. This advancement in sensor technology paves the way for broader applications in complex ionic environments.
基于石墨烯的pH传感器因其对环境变化具有卓越的敏感性而受到赞誉，在科学研究中引起了广泛关注。然而，由于德拜长度离子屏蔽效应，该传感器在高离子浓度环境中的性能受到限制。在本研究中，开发了一种创新的石墨烯通道pH传感装置，并通过交联聚甲基丙烯酸甲酯（PMMA）进行了改性。此外，即使在高离子浓度下，该传感器也能精确测量pH值。该传感器具有显著的灵敏度，在pH值为7至10的范围内，响应速率高达-70.49 mV/pH。值得注意的是，该传感器在不同离子浓度环境下保持一致的响应方向和灵敏度，并保持一致的可逆性和稳定性。传感器技术的这一进展为在复杂离子环境中的更广泛应用铺平了道路。
