A ppb-level NO2 gas sensor using coloration reactions in porous glass

Tanaka, Tohru; Guilleux, Annabelle; Ohyama, Takashi; Maruo, Yasuko Yamada; Hayashi, T.

doi:10.1016/s0925-4005(99)00185-9

Cited by 41 publications

(18 citation statements)

References 7 publications

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“…The focus of this overview is on conductometric integrating gas sensors but there are also optical (mostly organic dye-based coloration reactions) (Dasgupta et al, 1998;Tanaka et al, 1998Tanaka et al, , 1999Sasaki et al, 2001;Maruo, 2007;Maruo et al, 2009;Small et al, 2009;Bhalla et al, 2010), SAW (Martin et al, 1996;Nieuwenhuizen and Harteveld, 1997), field-effect transistors (FET) (Andringa et al, 2012;Klug et al, 2013), quartz microbalance (QMB) (Matsuguchi et al, 2005;Jung et al, 2009), and passive sampling (Roadman et al, 2003;Varshney and Singh, 2003;Seethapathy et al, 2008) devices that are able to detect very low gas concentrations in the ppb range.…”

Section: Introductionmentioning

confidence: 99%

Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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Abstract. The aim of this article is to introduce the operation principles of conductometric solid-state dosimeter-type gas sensors, which have found increased attention in the past few years, and to give a literature overview on promising materials for this purpose. Contrary to common gas sensors, gas dosimeters are suitable for directly detecting the dose (also called amount or cumulated or integrated exposure of analyte gases) rather than the actual analyte concentration. Therefore, gas dosimeters are especially suited for low level applications with the main interest on mean values. The applied materials are able to change their electrical properties by selective accumulation of analyte molecules in the sensitive layer. The accumulating or dosimeter-type sensing principle is a promising method for reliable, fast, and long-term detection of low analyte levels. In contrast to common gas sensors, few devices relying on the accumulation principle are described in the literature. Most of the dosimeter-type devices are optical, mass sensitive (quartz microbalance/QMB, surface acoustic wave/SAW), or field-effect transistors. The prevalent focus of this article is, however, on solid-state gas dosimeters that allow a direct readout by measuring the conductance or the impedance, which are both based on materials that change (selectively in ideal materials) their conductivity or dielectric properties with gas loading. This overview also includes different operation modes for the accumulative sensing principle and its unique features.

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Section: Introductionmentioning

confidence: 99%

Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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“…A variety of techniques such us vacuum sublimation, plasma-activated evaporation, solvent evaporation from a fine suspension, spin-coating, Langmuir-Blodgett and self-assembly deposition were used to produce these sensors. One very promising approach is to use porous material specified by a large specific surface areas [28]. Sensitivity enhancement by grain-size reduction is pronounced when the grain-size becomes smaller than the space-charge depth induced by surface chemisorbed gas species.…”

Section: Introductionmentioning

confidence: 99%

Novel optical NO2-selective sensor based on phthalocyaninato-iron(II) incorporated into a nanostructured matrix

Nezel

Steiger

Spichiger‐Keller

2006

Sensors and Actuators B: Chemical

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A novel highly sensitive optical NO 2 -selective sensor was developed using phthalocyaninato-iron(II) as a selective complexing agent. In order to solubilize the iron II+ phthalocyanine and to obtain the monomer species, a N-donor ligand was used as a solvent. The membrane solution was deposited onto a novel aluminum oxide/hydroxide nanoporous material by a spin-coating technique. The chemical reaction principle and the preparation of this new sensor are presented in detail. The effect of the type and concentration of the N-donor ligand, and the influence of the iron phthalocyanine concentration were investigated as well as the effect of the composition and the morphological characteristics of the nanostructured material. In addition, the influence of some relevant external parameters such as flow-rate and interfering compounds were investigated. The results show that the sensor responds to NO 2 concentrations in the gas phase between 5 × 10 −3 ppm and >0.5 ppm with a linear concentration range between 2 × 10 −2 and 0.4 ppm, the detection limit being at 20 ppb. The dynamic range it is not influenced by the flow-rate, by humidity, NO, CO, CO 2 and SO 2 , and the NO 2 -selective optical sensor shows good stability to ambient in view of a long lifetime as a gas and fire alarm detector. Generally 1 ppm NO 2 gas corresponds to 2.0 mg m −3 and 44.5 × 10 −6 mol m −3 .

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“…The NO2 sensor is an accumulation type sensor (Tanaka et al 1999). The sensor element that detects NO2 has a reagent contained in porous glass that reacts chemically only with a particular gas (diazo coupling reaction) as shown in Fig.…”

Section: No2 Sensormentioning

confidence: 99%