A Robust Flexible Electrochemical Gas Sensor Using Room Temperature Ionic Liquid

Mu, Xiaoyi; Wang, Zhe; Zeng, Xiangqun; Mason, Andrew J.

doi:10.1109/jsen.2013.2262932

Cited by 49 publications

(29 citation statements)

References 26 publications

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“…Remarkable benefits can be achieved using room temperature ionic liquid (RTIL) as the electrolyte in electrochemical sensing, since RTILs possess negligible vapor pressure, high thermal stability and a large working potential window [18]. This has encouraged design of many RTIL-based gas sensors that exhibit good performance and demonstrate the value of RTIL.…”

Section: Introductionmentioning

confidence: 99%

“…Two approaches that have been introduced to address this limitation are decreasing RTIL thickness and avoiding gas permeation through RTIL [19]. In our previous work, the second approach was adopted in a sensor structure with a porous polytetrafluoroethylene (PTFE) substrate through which gas could quickly diffuse [18, 20]. This sensor utilized constant potential amperometry, which is a classic electroanalytical method for gas detection [12, 21] that continuously applies a constant potential while recording the oxidation or reduction current for qualitative and quantitative gas analysis.…”

Section: Introductionmentioning

confidence: 99%

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Rapid measurement of room temperature ionic liquid electrochemical gas sensor using transient double potential amperometry

Wan

Yin

Mason

2017

Sensors and Actuators B: Chemical

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid measurement of room temperature ionic liquid electrochemical gas sensor using transient double potential amperometry

Wan

Yin

Mason

2017

Sensors and Actuators B: Chemical

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“…RTIL electrochemical sensors have demonstrated amperometric response to atmospheric gases like O 2 and CO 2 that are indicators of indoor air quality affecting human metabolism, and toxic pollutants such as NO 2 , NO, CO, SO 2 , H 2 S [3, 21–25]. Our group is developing an RTIL sensor array to simultaneously measure the concentrations of multiple gaseous analytes.…”

Section: Approach and Circuit Conceptmentioning

confidence: 99%

“…To implement miniaturized arrays of RTIL electrochemical sensors, we have developed a rapid-response structure on a porous Teflon substrate wherein each sensor element has an individual electrode and an individual electrolyte [3, 26]. This allows a variety of electrode materials and electrolyte chemical compositions to be used improve the sensor arrays ability to monitor a mixed-gas environment.…”

Section: Approach and Circuit Conceptmentioning

confidence: 99%

“…Many electrochemical sensors are operated with a technique known as chronoamperometry [3–5], in which the sensor is stimulated by a constant DC potential and generates a response current that correlates with the concentrations of one or more target compounds. Using amperometry methods, an electrochemical sensor’s bias potential can be tuned to a point of maximum reactivity with a specific gas, and sensor arrays at multiple bias potentials can be employed to statically calibrate for interferents and improve selectivity using pattern recognition algorithms [6].…”

Section: Introductionmentioning

confidence: 99%

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CMOS Amperometric ADC With High Sensitivity, Dynamic Range and Power Efficiency for Air Quality Monitoring

Boling

Mason

2016

IEEE Trans. Biomed. Circuits Syst.

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Airborne pollutants are a leading cause of illness and mortality globally. Electrochemical gas sensors show great promise for personal air quality monitoring to address this worldwide health crisis. However, implementing miniaturized arrays of such sensors demands high performance instrumentation circuits that simultaneously meet challenging power, area, sensitivity, noise and dynamic range goals. This paper presents a new multi-channel CMOS amperometric ADC featuring pixel-level architecture for gas sensor arrays. The circuit combines digital modulation of input currents and an incremental ΣΔ ADC to achieve wide dynamic range and high sensitivity with very high power efficiency and compact size. Fabricated in 0.5 μm CMOS, the circuit was measured to have 164 dB cross-scale dynamic range, 100 fA sensitivity while consuming only 241 μW and 0.157mm2 active area per channel. Electrochemical experiments with liquid and gas targets demonstrate the circuit’s real-time response to a wide range of analyte concentrations.

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A Humidity‐Resistant, Sensitive, and Stretchable Hydrogel‐Based Oxygen Sensor for Wireless Health and Environmental Monitoring

Wu,

Ding,

Wang

et al. 2023

Adv Funct Materials

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Highly sensitive and wearable gas sensors are highly demanded on account of their widespread application in health and environmental monitoring. However, the sensing performance of conventional room‐temperature gas sensors are prone to fluctuate or even fail under changing humidity, temperature or putting into water, thus severely limiting their practical applications. Herein, a porous elastomer‐encapsulated hydrogel‐based oxygen sensor is designed with impressive room‐temperature sensing performance under various environmental conditions, including high precision (at ppm level), wide detection range (from 5 ppm to 90% O2), excellent repeatability, selectivity, long‐term stability, breathability, and waterproofing. The hydrophobic elastomer film prevents the water molecules from intruding and evaporating to a great extent, making the device resistant to humidity interference and applicable to underwater operation. Benefiting from the intrinsic stretchability of both hydrogel and elastomer films and their strong interfacial bonding, the final device can be stretched up to 100% strain. By integrating the sensor with a wireless circuit module, a wearable/portable oxygen sensing system for real‐time monitoring of health and environment is demonstrated, realizing timely and convenient assessment of respiratory rate, tissue oxygen, ambient oxygen, and dissolved oxygen.

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A Robust Flexible Electrochemical Gas Sensor Using Room Temperature Ionic Liquid

Cited by 49 publications

References 26 publications

Rapid measurement of room temperature ionic liquid electrochemical gas sensor using transient double potential amperometry

Rapid measurement of room temperature ionic liquid electrochemical gas sensor using transient double potential amperometry

CMOS Amperometric ADC With High Sensitivity, Dynamic Range and Power Efficiency for Air Quality Monitoring

A Humidity‐Resistant, Sensitive, and Stretchable Hydrogel‐Based Oxygen Sensor for Wireless Health and Environmental Monitoring

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