Screen Printed Alizarin-Based Carbon Electrodes: Monitoring pH in Unbuffered Media
Screen Printed Alizarin-Based Carbon Electrodes: Monitoring pH in Unbuffered Media
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DOI：
10.1002/elan.201400704
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发表时间：
2015-04-01
期刊：
影响因子：
3
通讯作者：
Lawrence, Nathan S.
中科院分区：
文献类型：
--
作者：
Dai, Chencheng;Song, Peng;Lawrence, Nathan S.
介绍了一种基于茜素的伏安 pH 传感器。该装置是通过将茜素（一种 pH 敏感的氧化还原化合物）与碳墨水混合丝网印刷到碳铝（涂有碳浆的铝箔）上制成的。该电极对缓冲和非缓冲介质均表现出能斯特响应，电位变化为 55.8 mV/pH 单位，工作范围高达 pH 10。这种方法提出了一种一次性、可重复、低成本的 pH 传感方法，并具有小型化的可能性。对这种涂有 nafion 的传感器的进一步研究揭示了一种扩大工作范围和提高稳定性的可能方法。
An alizarin based voltammetric pH sensor is introduced. This device is fabricated by screen printing the alizarin, which is a pH-sensitive redox compound, mixed with carbon ink onto the carbon aluminum (aluminum foil coated with carbon paste). This electrode shows a Nernst response to both the buffered and unbuffered media, with a potential shift by 55.8 mV/pH unit and a working range up to pH 10. This approach suggests a disposable, reproducible, low-cost method for pH sensing with the possibility of miniaturization. A further study of this type of sensor coated with nafion reveals a possible method to expand the working range and improve the stability.