Amperometric Gas Sensors of High Sensitivity

Hodgson, Alexia W.E.; Jacquinot, P.; Jordan, Larry R.; Hauser, Peter C.

doi:10.1002/(sici)1521-4109(199907)11:10/11<782::aid-elan782>3.3.co;2-j

Cited by 4 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The design and assembly of the electrochemical cell has been described in previous work carried out within the group. − The cell was fabricated from Plexiglas (Mechanical Workshop, Chemistry Department, University of Basel, Switzerland), and the geometric working electrode area exposed to the gas stream was 0.79 cm 2 . The reference electrode was a mercury/mercurous sulfate electrode (MSE REF-601, Radiometer Analytical, France) with a saturated K 2 SO 4 filling solution, and it had a potential of +640 mV vs SHE.…”

Section: Methodsmentioning

confidence: 99%

“…The cell is based on a porous platinum sensing layer deposited onto one side of a Nafion solid polymer electrolyte (SPE) membrane, which is placed in direct contact with the gaseous atmosphere. The design of the cell has been described in previous publications; its potentials and performance have recently been reviewed. , We seek to illustrate further the adaptability of this device for the detection of a highly toxic and reactive gas, which has not as yet been considered. The experimental conditions and component materials required are discussed, as well as the effects of parameters such as humidity and flow rate on the response.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Amperometric Sensing of Ethylene Oxide in the Gas Phase

2000

Self Cite

View full text Add to dashboard Cite

The sensing device used is based on a porous Pt electrode, which is supported on an ion-exchange membrane and directly exposed to the gas phase. Under acid conditions, ethylene oxide was found to be oxidized on the platinum oxide surface at +550 mV vs MSE, thus enabling its monitoring via the measurement of the associated current. A detection limit of 15 ppb was obtained, based on a signal-to-noise ratio of three, and a linear dynamic range was found up to 100 ppm. The effects of mass transport, humidity, and oxygen on the cell response, as well as the cross sensitivity to other organic vapors and inorganic gases are discussed.

show abstract

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Amperometric Sensing of Ethylene Oxide in the Gas Phase

2000

Self Cite

View full text Add to dashboard Cite

show abstract

“…Platinum-based electrochemical sensors are known to react with multiple hydrocarbon compounds. Cross-sensitivity occurs when more than one species of gaseous molecule reacts at the working electrode's surface 18,19 . The current change due to oxidation of any non-ethylene molecules is then measured along with the current change due to the oxidation of ethylene molecules by the electrical circuit and is included in the determination of ethylene concentration.…”

Section: Theory Of Operation Electrochemical Ethylene Sensormentioning

confidence: 99%

“…Cross-sensitivity occurs when more than one species of gaseous molecule reacts at the working electrode's surface 18,19 . The extra electrons released by the oxidation of nontarget molecules are counted by the electrical circuit and lead to erroneously high estimations of the ethylene concentration, which compromises the sensor accuracy.…”

Section: Introductionmentioning

confidence: 99%

Sensors and Portable Instruments for Postharvest Agriculture

Lerud¹

2000

View full text Add to dashboard Cite

The sensing needs for the fresh produce industry can be split into two primary stages: during maturation in the field, also referred to as Precision Farming, and during storage and transport of the produce, or Postharvest Storage. This work seeks to improve the accuracy and reliability of commercially available electrochemical and spectroscopic sensors tailored to the sensing needs of the fresh produce industry. For electrochemical

show abstract

“…However, very high sensitivities and the achievement of unprecedentedly low detection limits in the low ppb range have been reported for direct contact gas electrodes based on solid polymer electrolytes. 5,[17][18][19]23 This performance makes them attractive for applications which cannot be covered by the commercially available sensors based on gas-diffusion electrodes. However, it is not clear if the high sensitivity of the electrodes based on metallized ion-exchange membranes is mainly a feature of the different electrode arrangement or is caused by other experimental parameters.…”

Section: Introductionmentioning

confidence: 99%

A direct comparison of amperometric gas sensors with gas-diffusion and ion-exchange membrane based electrodes

Knake

Jacquinot

Hauser

2001

Analyst

Self Cite

View full text Add to dashboard Cite

The effect of the nature of the working electrode used in amperometric gas sensors on the performance criteria of sensitivity, detection limit, gas flow rate and humidity dependence was evaluated. The arrangement based on metallized ion-exchange membranes (Nafion) was compared with gas-diffusion electrodes based on porous poly(tetrafluoroethylene) (PTFE) with metallic electrodes deposited on the rear side. Two representative analyte gases were chosen: SO2, which has fast reaction kinetics, and NO, which has slow reaction kinetics. It was found that both types of electrodes showed a similar performance. A dependence on the flow rate of the sample gas was found in both cases. The sensitivities were higher for the ion-exchange membrane-backed electrodes; however, the 3sigma detection limits were all in the lower ppb range and for NO were significantly lower on the Nafion membrane than on the PTFE membrane. The Nafion electrode was found to show a dependence on the relative humidity of the gas stream, but not the PTFE-based electrode.

show abstract

Amperometric Gas Sensors of High Sensitivity

Cited by 4 publications

References 0 publications

Amperometric Sensing of Ethylene Oxide in the Gas Phase

Amperometric Sensing of Ethylene Oxide in the Gas Phase

Sensors and Portable Instruments for Postharvest Agriculture

A direct comparison of amperometric gas sensors with gas-diffusion and ion-exchange membrane based electrodes

Contact Info

Product

Resources

About