کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5009729 1462049 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rapid measurement of room temperature ionic liquid electrochemical gas sensor using transient double potential amperometry
ترجمه فارسی عنوان
اندازه گیری سریع از دمای اتاق دماسنج الکتروشیمیایی مایع یونی با استفاده از آمپرمترنت بالقوه دوگانه گذرا
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


- An electrochemical gas sensor was fabricated with porous polytetrafluoroethylene as the substrate and room temperature ionic liquid as the electrolyte.
- A new transient double potential amperometry was explored to decrease measurement time and reverse reaction by-products.
- The sensor was validated to present good sensitivity, high linearity and good repeatability with the new method.

Intense study on gas sensors has been conducted to implement fast gas sensing with high sensitivity, reliability and long lifetime. This paper presents a rapid amperometric method for gas sensing based on a room temperature ionic liquid electrochemical gas sensor. To implement a miniaturized sensor with a fast response time, a three electrode system with gold interdigitated electrodes was fabricated by photolithography on a porous polytetrafluoroethylene substrate that greatly enhances gas diffusion. Furthermore, based on the reversible reaction of oxygen, a new transient double potential amperometry (DPA) was explored for electrochemical analysis to decrease the measurement time and reverse reaction by-products that could cause current drift. Parameters in transient DPA including oxidation potential, oxidation period, reduction period and sample point were investigated to study their influence on the performance of the sensor. Oxygen measurement could be accomplished in 4 s, and the sensor presented a sensitivity of 0.2863 μA/[%O2] and a linearity of 0.9943 when tested in air samples with different oxygen concentrations. Repeatability and long-term stability were also investigated, and the sensor was shown to exhibit good reliability. In comparison to conventional constant potential amperometry, transient DPA was shown to reduce relative standard deviation by 63.2%. With transient DPA, the sensitivity, linearity, repeatability, measurement time and current drift characteristics demonstrated by the presented gas sensor are promising for acute exposure applications.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 242, April 2017, Pages 658-666
نویسندگان
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