Electrochemical sensing of gases based on liquid collection interfaces

Huiliang, Huang; Dasgupta, Purnendu Κ.

doi:10.1002/elan.1140090802

Cited by 15 publications

(6 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main concern with the electrochemical approaches is the low O 3 solubility in liquid electrolyte, which limits the sensor sensitivity. In addition, common reactive species like NO 2 and SO 2 interfere with this measurement [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Potassium Iodide-Functionalized Polyaniline Nanothin Film Chemiresistor for Ultrasensitive Ozone Gas Sensing

et al. 2017

View full text Add to dashboard Cite

Polyaniline (PANI) nanostructures have been widely studied for their sensitivity to atmospheric pollutants at ambient conditions. We recently showed an effective way to electropolymerize a PANI nanothin film on prefabricated microelectrodes, and demonstrated its remarkable sensing performance to be comparable to that of a one-dimensional nanostructure, such as PANI nanowires. In this work, we report further progress in the application of the PANI nanothin film chemiresistive sensor for the detection of ozone (O 3 ) by modifying the film with potassium iodide (KI). The KI-PANI sensor exhibited an excellent sensitivity to O 3 (8-180 ppb O 3 concentration rage) with a limit of detection of 230 ppt O 3 , and exquisite selectivity against active chemicals such as nitrogen dioxide (NO 2 ) and sulfur dioxide (SO 2 ). The sensing mechanism of the sensor relied on iodometric chemistry of KI and O 3 , producing triiodide (I − 3 ) that partially doped and increased electrical conductivity of the PANI film. The sensitivity and selectivity of the KI-functionalized PANI film demonstrates the potential use for KI-PANI-based O 3 sensing devices in environmental monitoring and occupational safety.

show abstract

Section: Introductionmentioning

confidence: 99%

Potassium Iodide-Functionalized Polyaniline Nanothin Film Chemiresistor for Ultrasensitive Ozone Gas Sensing

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Residual water in the pores of the xerogels has an important role in both cases. Indeed, the resulting sensors are conceptually similar to the systems with electrodes bonded to wetted organic polymers [9], to assemblies comprising Nafion films over electrode arrays [10,11], and to liquid collection interface systems and diffusional scrubbers [12].…”

Section: Introductionmentioning

confidence: 99%

Solid-State Voltammetric Determination of Gaseous Hydrogen Peroxide Using Nanostructured Silica as the Electrolyte

Holmstrom

Cox

1998

Electroanalysis

View full text Add to dashboard Cite

By a base-catalyzed sol-gel process, solids were prepared that extracted hydrogen peroxide from the gas phase and served as electrolytes for the voltammetric oxidation of HO 2 ¹ in the absence of a contacting liquid phase. A combination of a 60-min preconcentration by solid-phase extraction into the pore water of the xerogel and differential pulse voltammetry provided a detection limit of 10.2 ppbv H 2 O 2 . The linear least squares calibration plot parameters over the range 96-5400 ppbv were: slope 58.5 nA(ppmv) ¹1 ; intercept ¹1.70 nA; and r 0.999. The sensitivity was increased by including Triton X-114 well-above its critical micelle concentration and 1.3 M MgCl 2 in the sol. The former is known to provide domains that serve as templates for obtaining nanoporous silica, and the latter acts as an internal humidistat that controls the pore water of the resulting xerogel in the 50 % (by weight) range.

show abstract

“…Spectrophotometric, chemiluminescene, potentiometric, amperometric, and passive sampling methods were reported for determining ozone in ambient air (Eipel et al 2003 ; Huang and Dasgupta 1997 ; Shiavon et al 1990 ).…”

Section: Introductionmentioning

confidence: 99%

Determination of nitrogen dioxide, sulfur dioxide, ozone, and ammonia in ambient air using the passive sampling method associated with ion chromatographic and potentiometric analyses

Salem

Soliman

Elhaty

2009

Air Qual Atmos Health

View full text Add to dashboard Cite

Concentrations of nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), ozone (O 3 ), and ammonia (NH 3 ) were determined in the ambient air of Al-Ain city over a year using the passive sampling method associated with ion chromatographic and potentiometric detections. IVL samplers were used for collecting nitrogen and sulfur dioxides whereas Ogawa samplers were used for collecting ozone and ammonia. Five sites representing the industrial, traffic, commercial, residential, and background regions of the city were monitored in the course of this investigation. Year average concentrations of ≤59.26, 15.15, 17.03, and 11.88 μg/m 3 were obtained for NO 2 , SO 2 , O 3 , and NH 3 , respectively. These values are lower than the maxima recommended for ambient air quality standards by the local environmental agency and the world health organization. Results obtained were correlated with the three meteorological parameters: humidity, wind speed, and temperature recorded during the same period of time using the paired t test, probability p values, and correlation coefficients. Humidity and wind speed showed insignificant effects on NO 2 , SO 2 , O 3 , and NH 3 concentrations at 95% confidence level. Temperature showed insignificant effects on the concentrations of NO 2 and NH 3 while significant effects on SO 2 and O 3 were observed. Nonlinear correlations (R 2 ≤ 0.722) were obtained for the changes in measured concentrations with changes in the three meteorological parameters. Passive samplers were shown to be not only precise (RSD≤13.57) but also of low cost, low technical demand, and expediency in monitoring different locations.

show abstract

Electrochemical sensing of gases based on liquid collection interfaces

Cited by 15 publications

References 56 publications

Potassium Iodide-Functionalized Polyaniline Nanothin Film Chemiresistor for Ultrasensitive Ozone Gas Sensing

Potassium Iodide-Functionalized Polyaniline Nanothin Film Chemiresistor for Ultrasensitive Ozone Gas Sensing

Solid-State Voltammetric Determination of Gaseous Hydrogen Peroxide Using Nanostructured Silica as the Electrolyte

Determination of nitrogen dioxide, sulfur dioxide, ozone, and ammonia in ambient air using the passive sampling method associated with ion chromatographic and potentiometric analyses

Contact Info

Product

Resources

About