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首页> 外文期刊>IEEE sensors journal >Zinc Magnesium Oxide-Based Nanorods for High-Precision pH Sensing
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Zinc Magnesium Oxide-Based Nanorods for High-Precision pH Sensing

机译：基于氧化镁的氧化镁纳米棒，用于高精度pH感测

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摘要

We developed a zinc magnesium oxide-based nanosensor platform for pH sensing. pH is a parameter strongly influential in various chemical, biological, and biomedical applications. Oxide-based semiconductors are preferred as pH sensing materials because of their robustness, size modulation, high sensitivity, cost effectiveness, reversibility of the sensing process, and long lifetime. Vertical nanorods of zinc magnesium oxide were fabricated for the nanosensor platform. Their high crystalline quality was confirmed through various structural characterization techniques such as high-resolution X-ray diffraction and scanning and transmission electron microscopy. Absorption spectroscopy revealed a bandgap of 3.56 eV corresponding to 12% magnesium. pH dependent photoluminescence (PL) measurements showed a shift in the visible range spectrum with decrease in PL intensity. The developed sensor showed high sensitivity of 44.4 +/- 3.8 mV/pH, close to the theoretical value, in the 2.4-10 pH range. AC- and DC-based current measurements were performed to study the sensing mechanism. Conductance-based pH measurement, a unique and precise technique, yielded a high sensitivity of 4.59 mS/pH. The proposed nanosensors, which are low cost and easy to fabricate and use, exhibited rapid response, long-term stability, high sensitivity (in both potentiometric as well as conductance-basedmeasurements), and high repeatability.
机译：我们开发了一种用于pH感测的氧化镁基纳米传感器平台。 pH是各种化学，生物学和生物医学应用中强烈影响的参数。由于其鲁棒性，尺寸调制，高灵敏度，成本效益，传感过程的可逆性和长寿，氧化物基半导体是pH感应材料的优选。为纳米传感器平台制造氧化锌氧化锌的垂直纳米棒。通过诸如高分辨率X射线衍射和扫描和透射电子显微镜等各种结构表征技术来确认它们的高结晶质量。吸收光谱显示3.56eV的带隙，对应于12％的镁。 pH依赖性光致发光（PL）测量显示在可见范围谱中的偏移，下PL强度降低。发达的传感器显示出44.4 +/- 3.8 mV / pH的高灵敏度，接近理论值，在2.4-10 pH范围内。进行基于DC的电流测量以研究传感机制。基于电导的pH测量，独特且精确的技术，产生4.59ms / pH的高灵敏度。所提出的纳米传感器，其低成本且易于制造和使用，表现出快速的响应，长期稳定性，高灵敏度（在电位型和电极和电导率中，可重复性高。

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