Hossain Md Sanwar, Padmanathan Narayanasamy, Badal Md Mizanur R, Razeeb Kafil M, Jamal Mamun
Department of Chemistry, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh.
Micro-NanoSystems Centre, Tyndall National Institute, University College Cork, Dyke Parade, Lee Maltings, Cork T12 R5CP, Ireland.
ACS Omega. 2024 Sep 12;9(38):40122-40133. doi: 10.1021/acsomega.4c06090. eCollection 2024 Sep 24.
This study introduces a potentiometric pH sensor that is extremely sensitive and specifically designed for food and pharmaceutical applications. The sensor utilizes a pH-sensitive interface fabricated by electropolymerizing polyaniline (PANI) on carbon fiber cloth (CFC). Structural and morphological analyses of PANI-CFC and CFC have been conducted by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and X-ray photoelectron spectroscopy (XPS). The investigation of the functional groups was conducted by using Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. The electrochemical characteristics were assessed by utilization of cyclic voltammetry (CV) and open-circuit potential (OCP) measurements in a three-electrode configuration. The sensor exhibited a sensitivity of 60.9 mV/pH, while retaining consistent performance within the pH range of 4 to 12. The repeatability and robustness of the sensors were verified. The accuracy of the PANI-CFC sensor was confirmed by validation using real samples, demonstrating its compatibility with commercially available pH sensors. The application of density functional theory (DFT) calculations revealed an interaction energy of -173.2886 kcal/mol, indicating a strong affinity of H ions towards PANI-CFC electrode. Further investigation was conducted to examine the chemical reactivity of PANI, revealing a HOMO-LUMO energy gap of -0.98 eV. This study highlights the PANI-CFC sensor as a reliable and efficient pH-sensing platform for food and pharmaceuticals applications, performing robustly in both laboratory and real-world settings.
本研究介绍了一种电位式pH传感器，该传感器极其灵敏，是专门为食品和制药应用设计的。该传感器利用在碳纤维布（CFC）上通过电聚合聚苯胺（PANI）制备的pH敏感界面。通过使用X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）和X射线光电子能谱（XPS）对聚苯胺-碳纤维布和碳纤维布进行了结构和形态分析。通过使用傅里叶变换红外光谱（FTIR）和拉曼光谱对官能团进行了研究。在三电极配置中利用循环伏安法（CV）和开路电位（OCP）测量评估了电化学特性。该传感器表现出60.9 mV/pH的灵敏度，同时在4至12的pH范围内保持一致的性能。验证了传感器的重复性和稳健性。通过使用实际样品进行验证，证实了聚苯胺-碳纤维布传感器的准确性，表明其与市售pH传感器的兼容性。密度泛函理论（DFT）计算的应用揭示了-173.2886 kcal/mol的相互作用能，表明H离子对聚苯胺-碳纤维布电极具有很强的亲和力。进一步研究了聚苯胺的化学反应性，揭示了-0.98 eV的HOMO-LUMO能隙。本研究强调了聚苯胺-碳纤维布传感器是一种可靠且高效地用于食品和制药应用的pH传感平台，在实验室和实际环境中均表现出色。
