Electrochemical investigations on multi-metallic electrodes for amperometric NO gas sensors

Schmidt‐Zhang, Peter; Zhang, W.; Gerlach, Frank; Ahlborn, K.; Guth, U.

doi:10.1016/j.snb.2004.12.074

Cited by 37 publications

(10 citation statements)

References 8 publications

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“…Although many potentiometric [14][15][16][17][18], amperometric [19][20][21][22][23], and impedancemetric [24][25][26][27][28] YSZ-based gas sensors have been reported so far, mixed-potential type gas sensors have been receiving the great attention among researchers during the last decades, owing to their special capability to measure low concentrations of pollutant gases in car exhausts or atmospheric air in the wider operating temperature range of 450-900°C [9,29,30]. The abnormal phenomenon of potential signal in the gas mixture containing air and fuel for a zirconia-based oxygen sensor has been first observed by Fleming and Pebler in 1977 [31], calling it the non-Nernstian behavior.…”

Section: Introductionmentioning

confidence: 99%

A review of mixed-potential type zirconia-based gas sensors

Miura

Sato

Anggraini

et al. 2014

Ionics

301

175

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A robust and reliable gas sensing device is considered as a convenient and practical solution for gas concentration monitoring that has become a mandatory requirement in different field of applications. For in situ hazardous gases detection, a mixed-potential type gas sensor has been regarded as a promising solid-state gas sensor. For the past three decades, there has been a significant progress in achieving high performance in mixed-potential type sensors. Therefore, this review is focused on reporting the development of mixedpotential type gas sensors with combined yttria-stabilized zirconia (YSZ) as the base solid electrolyte material and various classes of electrode materials for their potential utilization as a high-performance sensing electrode. The underlying sensing mechanism of a mixed-potential type YSZ-based sensor is elaborated here in detail. Transformation in design and configuration of this type of sensor is also covered in this report. In addition, recent progresses on mixed-potential type gas sensors development for detection of several target gases, such as carbon monoxide, hydrocarbons, nitrogen oxides, hydrogen, and ammonia, are reviewed. Strategies to improve the sensing characteristic, particularly gas sensitivity and selectivity, are also reported. Based on the understanding of the fundamental sensing mechanism and the requirements for high-performance gas sensors, challenges and future trends for this type of gas sensor development are discussed.

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Section: Introductionmentioning

confidence: 99%

A review of mixed-potential type zirconia-based gas sensors

Miura

Sato

Anggraini

et al. 2014

Ionics

301

175

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“…We monitored real time NO production by RBC in static and vortex conditions by an ultra-sensitive NO electrode 13 . Figure 3a,b shows vortexed RBC produced 10 fold higher levels of NO than static RBC.…”

Section: Resultsmentioning

confidence: 99%

“…NO measurement was carried out at 37 °C using Apollo 4000, an optically multi-channel free radical analyzer with an NO selective membrane 13 . The NO selective membrane was calibrated with isotonic buffer prior to experiments.…”

Section: Discussionmentioning

confidence: 99%

Mechanical perturbations trigger endothelial nitric oxide synthase activity in human red blood cells

Nagarajan¹,

Raj²,

Venkatesan³

et al. 2016

Sci Rep

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Nitric oxide (NO), a vascular signaling molecule, is primarily produced by endothelial NO synthase. Recently, a functional endothelial NO synthase (eNOS) was described in red blood cells (RBC). The RBC-eNOS contributes to the intravascular NO pool and regulates physiological functions. However the regulatory mechanisms and clinical implications of RBC-eNOS are unknown. The present study investigated regulation and functions of RBC-eNOS under mechanical stimulation. This study shows that mechanical stimuli perturb RBC membrane, which triggers a signaling cascade to activate the eNOS. Extracellular NO level, estimated by the 4-Amino-5-Methylamino-2′, 7′-Difluorofluorescein Diacetate probe, was significantly increased under mechanical stimuli. Immunostaining and western blot studies confirmed that the mechanical stimuli phosphorylate the serine 1177 moiety of RBC-eNOS, and activates the enzyme. The NO produced by activation of RBC-eNOS in vortexed RBCs promoted important endothelial functions such as migration and vascular sprouting. We also show that mechanical perturbation facilitates nitrosylation of RBC proteins via eNOS activation. The results of the study confirm that mechanical perturbations sensitize RBC-eNOS to produce NO, which ultimately defines physiological boundaries of RBC structure and functions. Therefore, we propose that mild physical perturbations before, after, or during storage can improve viability of RBCs in blood banks.

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“…Among various gas sensors, a solid-electrolyte type sensor using YSZ, which is thermally, chemically and mechanically stable material, has been reported to give excellent sensing characteristics when an SE material and operating conditions were selected properly [1][2][3][4]. At present, a Pt/air or a metal/metal-oxide couple is used as RE for YSZ-based gas sensors [5][6][7].…”

Section: Introductionmentioning

confidence: 99%