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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing
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Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing

机译：羧基和胺端基在掺杂硼的金刚石溶液栅场效应晶体管（SGFET）上用于pH传感的作用

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摘要

In this paper, we report on the effect of carboxyl- and amine terminations on a boron-doped diamond surface (BDD) in relation to pH sensitivity. Carboxyl termination was achieved by anodization oxidation in Carmody buffer solution (pH 7). The carboxyl-terminated diamond surface was exposed to nitrogen radicals to generate an amine-terminated surface. The pH sensitivity of the carboxyl- and amine-terminated surfaces was measured from pH 2 to pH 12. The pH sensitivities of the carboxyl-terminated surface at low and high pH are 45 and 3 mV/pH, respectively. The pH sensitivity after amine termination is significantly higher—the pH sensitivities at low and high pH are 65 and 24 mV/pH, respectively. We find that the negatively-charged surface properties of the carboxyl-terminated surface due to ionization of –COOH causes very low pH detection in the high pH region (pH 7–12). In the case of the amine-terminated surface, the surface properties are interchangeable in both acidic and basic solutions; therefore, we observed pH detection at both low and high pH regions. The results presented here may provide molecular-level understanding of surface properties with charged ions in pH solutions. The understanding of these surface terminations on BDD substrate may be useful to design diamond-based biosensors.
机译：在本文中，我们报告了与pH敏感度有关的硼掺杂金刚石表面（BDD）上羧基和胺末端的影响。通过在Carmody缓冲溶液（pH 7）中进行阳极氧化可以实现羧基的终止反应。使羧基封端的金刚石表面暴露于氮自由基以产生胺封端的表面。在pH 2至pH 12范围内测量羧基和胺端基表面的pH敏感性。在低pH和高pH下，羧基端基表面的pH敏感性分别为45和3 mV / pH。胺终止后的pH敏感性要高得多-在低pH和高pH下的pH敏感性分别为65和24 mV / pH。我们发现，由于–COOH的电离，羧基封端的表面带负电的表面特性会在高pH区域（pH 7-12）导致非常低的pH检测。对于胺端基的表面，在酸性和碱性溶液中其表面性质都可以互换。因此，我们在低和高pH区域都观察到了pH检测。此处给出的结果可以提供分子水平对pH溶液中带电离子的表面特性的了解。了解BDD基板上的这些表面终止可能有助于设计基于金刚石的生物传感器。

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