Development of high sensitivity potentiometric NOx sensor and its application to breath analysis

Mondal, Sankar Prasad; Dutta, Prabir K.; Hunter, Gary W.; Ward, Benjamin; Laskowski, Daniel; Dweik, Raed A.

doi:10.1016/j.snb.2011.05.063

Cited by 64 publications

(41 citation statements)

References 30 publications

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“…A sensitivity of 0.5 ppbv with 1 s acquisition time is obtained. A minimum detection limit of 0.05 ppbv is reached with 10 min integration time this work, and it is comparable with other ongoing optical sensor developments [18,19], even though it does not represent the ultimate sensitivity (comparison in terms of absorption path length). For breath analysis, the detection limit of 0.5 ppbv in 1 s is sufficient for on-line monitoring of the low ppbv NO concentrations in the exhaled breath, whilst a better sensitivity can be achieved for plant studies by averaging the signal.…”

Section: Wavelength Modulation Spectroscopysupporting

confidence: 71%

Spectroscopic monitoring of NO traces in plants and human breath: applications and perspectives

et al. 2012

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Optical methods based on quantum cascade lasers (QCLs) are becoming popular in many life science applications. We report on two trace gas detection schemes based on continuous wave QCLs for on-line detection of nitric oxide (NO) at the sub-part-per-billion level by volume (ppbv, 1 : 10 −9 ), using wavelength modulation spectroscopy (WMS) and Faraday rotation spectroscopy (FRS) at 1894 cm −1 and 1875.73 cm −1 , respectively. Several technical incremental steps are discussed to further improve the sensitivity of these methods. Examples are included to demonstrate the merits of WMS-based sensor: direct monitoring of NO concentrations in exhaled breath, and from plants under pathogen attack. A simple hand-held breath sampling device that allows single breath collection at various exhalation flows (15, 50, 100 and 300 mL/s, respectively) is developed for off-line measurements and validated in combination with the WMS-based sensor. Additionally, the capability of plants to remove environmental NO is presented.

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Section: Wavelength Modulation Spectroscopysupporting

confidence: 71%

Spectroscopic monitoring of NO traces in plants and human breath: applications and perspectives

et al. 2012

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“…The concentration of NO x in these exhausts can be hundreds of ppm. Recently, there has been interest in NO sensors in human breath as a way to diagnose respiratory diseases with concentration range of the order of ppb [6,7].…”

Section: Introductionmentioning

confidence: 99%

Building Selectivity for NO Sensing in a NOx Mixture with Sonochemically Prepared CuO Structures

Mullen

Dutta

2015

Chemosensors

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Several technologies are available for decreasing nitrogen oxide (NOx) emissions from combustion sources, including selective catalytic reduction methods. In this process, ammonia reacts with nitric oxide (NO) and nitrogen dioxide (NO 2 ). As the stoichiometry of the two reactions is different, electrochemical sensor systems that can distinguish between NO and NO 2 in a mixture of these two gases are of interest. Since NO and NO 2 can be brought to equilibrium, depending on the temperature and the surfaces that they are in contact with, the detection of NO and NO 2 independently is a difficult problem and has not been solved to date. In this study, we explore a high surface area sonochemically prepared CuO as the resistive sensing medium. CuO is a poor catalyst for NOx equilibration, and requires temperatures of 500˝C to bring about equilibration. Thus, at 300˝C, NO and NO 2 retain their levels after interaction with CuO surface. In addition, NO adsorbs more strongly on the CuO over NO 2 . Using these two concepts, we can detect NO with minimal interference from NO 2 , if the latter gas concentration does not exceed 20% in a NOx mixture over a range of 100-800 ppm. Since this range constitutes most of the range of total NOx concentrations in diesel and other lean burn engines, this sensor should find application in selective detection of NO in this combustion application. A limitation of this sensor is the interference with CO, but with combustion in excess air, this problem should be alleviated.

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“…A second method is by connecting sensors in series (Figure 6b), where the EMF is additive. It has been demonstrated that a 10-sensor array can detect NO concentrations as low as a few ppb [29,30].…”

Section: Oxide-based No X Sensormentioning

confidence: 99%

(Sensor Division Outstanding Achievement Award Presentation) Ceramic Gas Sensors to Oxide Nanostructures: Opportunities and Challenges

Akbar¹

2013

ECS Trans.

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This article summarizes R&D efforts in the author's laboratory starting with the development of ceramic-based gas sensors to the fabrication of ordered/oriented oxide nanostructures exploiting intrinsic material properties. Over the past twenty years, our focus has been on the development of a series of high-temperature gas sensors specifically for combustion processes. We have developed both the resistive and electrochemical sensors and the underlying theme of our work has been the use of materials science and chemistry to promote high-temperature performance with selectivity. Our recent work has led to the development of surface modification techniques for the fabrication of oxide nanostructures that are inexpensive, highly scalable and do not require use of lithography. These nano-structures can be used as platforms for chemical sensing, photocatalysis, electroemission and biomedical applications. This article is concluded with preliminary results on chemical sensing along with future directions.

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Development of high sensitivity potentiometric NOx sensor and its application to breath analysis

Cited by 64 publications

References 30 publications

Spectroscopic monitoring of NO traces in plants and human breath: applications and perspectives

Spectroscopic monitoring of NO traces in plants and human breath: applications and perspectives

Building Selectivity for NO Sensing in a NOx Mixture with Sonochemically Prepared CuO Structures

(Sensor Division Outstanding Achievement Award Presentation) Ceramic Gas Sensors to Oxide Nanostructures: Opportunities and Challenges

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