制备和优化 Nafion 作为 TiN 基 pH 传感器的保护膜。

Fabrication and Optimization of Nafion as a Protective Membrane for TiN-Based pH Sensors.

机构信息

School of Science, Edith Cowan University, Joondalup, WA 6027, Australia.

出版信息

Sensors (Basel). 2023 Feb 20;23(4):2331. doi: 10.3390/s23042331.

DOI:10.3390/s23042331

PMID:36850929

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9965570/

Abstract

In this study, a solid-state modified pH sensor with RF magnetron sputtering technology was developed. The sensor consists of an active electrode consisting of a titanium nitride (TiN) film with a protective membrane of Nafion and a reference glass electrode of Ag/AgCl. The sensitivity of the pH sensor was investigated. Results show a sensor with excellent characteristics: sensitivity of 58.6 mV/pH for pH values from 2 to 12, very short response time of approximately 12 s in neutral pH solutions, and stability of less than 0.9 mV in 10 min duration. Further improvement in the performance of the TiN sensor was studied by application of a Nafion protective membrane. Nafion improves the sensor sensitivity close to Nernstian by maintaining a linear response. This paves the way to implement TiN with Nafion protection to block any interference species during real time applications in biosensing and medical diagnostic pH sensors.

摘要

在这项研究中，我们采用射频磁控溅射技术开发了一种固态改性 pH 传感器。该传感器由一个活性电极组成，活性电极为氮化钛 (TiN) 薄膜，具有一层 Nafion 保护膜和一个 Ag/AgCl 参考玻璃电极。我们对 pH 传感器的灵敏度进行了研究。结果表明，该传感器具有优异的特性：在 pH 值为 2 到 12 的范围内，灵敏度为 58.6 mV/pH；在中性 pH 溶液中的响应时间非常短，约为 12 s；在 10 分钟的时间内，稳定性小于 0.9 mV。通过应用 Nafion 保护膜进一步改善了 TiN 传感器的性能。Nafion 通过保持线性响应来提高传感器的灵敏度，使其接近能斯特响应。这为在生物传感和医学诊断 pH 传感器的实时应用中使用 TiN 与 Nafion 保护来阻断任何干扰物种铺平了道路。