In this study, a one-pot synthesis of a molybdenum diselenide/nitrogen-doped graphene oxide (MoSe₂/NGO) composite was demonstrated and used for the fabrication of an electrochemical pH sensor. The MoSe₂/NGO composite was characterized using powder X-ray diffraction, infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and Brunauer–Emmett–Teller analysis. The electrochemical behavior at different pH values was determined by recording the open-circuit potential. When applied for pH detection, the MoSe₂/NGO modified screen-printed electrode (SPE) showed good linearity with a sensitivity of 61.3 mV pH⁻¹ over a wide pH range of 2–14. In addition, the pH sensor exhibited a remarkably stable response, high reproducibility, and selectivity. The sensor was used to measure the acidity or alkalinity of real food and beverage samples. The results for these samples showed a relative error of less than 10% compared with the results obtained with the commercial pH meter. The portable sensor produced by screen printing electrodes paves the way for the development of simple, cost-effective, real-time, and robust pH sensors for the pH analysis of various sample matrices for clinical diagnostics, biosensing, and cost-effective applications.

中文翻译：

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一锅法合成二硒化钼/氮掺杂氧化石墨烯丝网印刷电极构建电化学pH传感器

_{在这项研究中，演示了二硒化钼/氮掺杂氧化石墨烯 (MoSe 2} /NGO) 复合材料的一锅法合成，并将其用于电化学 pH 传感器的制造。使用粉末X射线衍射、红外光谱、拉曼光谱、X射线光电子能谱、热重分析、扫描电子显微镜、透射电子显微镜、能量色散X射线光谱和Brunauer-Emmett对MoSe ₂ /NGO复合材料进行了表征–出纳员分析。通过记录开路电位来确定不同pH值下的电化学行为。当应用于pH检测时，MoSe ₂ /NGO修饰的丝网印刷电极（SPE）表现出良好的线性度，在2-14的宽pH范围内灵敏度为61.3 mV pH ^-1 。此外，pH传感器表现出非常稳定的响应、高再现性和选择性。该传感器用于测量真实食品和饮料样品的酸度或碱度。与商用 pH 计获得的结果相比，这些样品的结果显示相对误差小于 10%。由丝网印刷电极生产的便携式传感器为开发简单、经济高效、实时且强大的 pH 传感器铺平了道路，用于临床诊断、生物传感和经济高效应用的各种样品基质的 pH 分析。