A Nanojunction pH Sensor within a Nanowire,Analytical Chemistry

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A Nanojunction pH Sensor within a Nanowire
Analytical Chemistry ( IF 6.7 ) Pub Date : 2022-08-24 , DOI: 10.1021/acs.analchem.2c02606
Nicholas P Drago ₁ , Eric J Choi ₁ , Jihoon Shin ₂ , Dong-Hwan Kim ₂ , Reginald M Penner ₁

Affiliation

pH sensors that are nanoscopic in all three dimensions are fabricated within a single gold nanowire. Fabrication involves the formation of a nanogap within the nanowire via electromigration, followed by electropolymerization of pH-responsive poly(aniline) (PANI) that fills the nanogap forming the nanojunction. All fabrication steps are performed using wet chemical methods that do not require a clean room. The measured electrical impedance of the PANI nanojunction is correlated with pH from 2.0 to 9.0 with a response time of 30 s. Larger, micrometer-scale PANI junctions exhibit a slower response. The measured pH is weakly influenced by the salt concentration of the contacting aqueous solution. An impedance measurement at two frequencies (300 kHz and 1.0 Hz) enables estimation of the salt concentration and correction of the measured pH value, preserving the accuracy of the pH measurement across the entire calibration curve for salt concentrations up to 1.0 M. The result is a nanoscopic pH sensor with pH sensing performance approaching that of a conventional, macroscopic pH glass-membrane electrode.

中文翻译：

纳米线内的纳米结 pH 传感器

在所有三个维度上都是纳米级的 pH 传感器是在单个金纳米线内制造的。制造包括通过电迁移在纳米线内形成纳米间隙，然后电聚合填充纳米间隙的 pH 响应型聚苯胺 (PANI)，形成纳米结。所有制造步骤均使用不需要洁净室的湿化学方法进行。测得的 PANI 纳米结的电阻抗与 2.0 至 9.0 的 pH 值相关，响应时间为 30 秒。较大的微米级 PANI 结表现出较慢的响应。测量的 pH 值受接触水溶液的盐浓度的影响很小。两个频率（300 kHz 和 1.0 Hz）的阻抗测量可以估计盐浓度和校正测量的 pH 值，

更新日期：2022-08-24

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