The effect of relative humidity on the NO2 sensitivity of a SnO2/WO3 heterojunction gas sensor

Zhang, Ling; Leach, C.

doi:10.1016/j.snb.2004.02.017

Cited by 107 publications

(54 citation statements)

References 21 publications

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“…Many researchers have studied the influence of humidity on gas sensors, and some sensors were reported to be insensitive at high RH [46][47][48]. Fig.…”

Section: Humidity Effectmentioning

confidence: 99%

Electrical response of Sm2O3-doped SnO2 to C2H2 and effect of humidity interference

Qi¹,

Zhang²,

Zheng³

et al. 2008

Sensors and Actuators B: Chemical

159

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“…Many researchers have studied the influence of humidity on gas sensors, and some sensors were reported to be insensitive at high RH [46][47][48]. Fig.…”

Section: Humidity Effectmentioning

confidence: 99%

Electrical response of Sm2O3-doped SnO2 to C2H2 and effect of humidity interference

Qi¹,

Zhang²,

Zheng³

et al. 2008

Sensors and Actuators B: Chemical

159

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“…In order to develop NO 2 -sensors based on MP, the following gas-permeable supports were used: (1) pre-cleaned glass slides [14]; (2) gold-coated optical waveguides [24]; (3) tinmodified mesoporous silica [25]; (4) SnO 2 [26]; (5) porous silicon [27]; etc. 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.…”

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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“…At lower temperature, the species cover the sensor surface, which prevents reactions of acetone vapor and chemisorbed oxygen and therefore resistance of the sensor decreases considerably [25]. However, the use of PANI in the composite induces the formation of -heterojunctions between -type PANI and -type WO 3 and lead to a redistribution of charge carriers at the interface of these material, decreasing the activation energy and enthalpy required for the physisorption of acetone, allowing the detection at room temperature [20,26,27]. The inclusion of cellulose as the carbon source in the composite increases the sensitivity of the sensor, which might be induced by the formation of pores on the surface of composite, as reported by Sakai et al [28].…”

Section: Sensing Mechanismmentioning

confidence: 99%

Room Temperature Detection of Acetone by a PANI/Cellulose/WO₃Electrochemical Sensor

Aparicio-Martínez

Osuna

Dominguez

et al. 2018

Journal of Nanomaterials

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Chemical sensing based on semiconducting metal oxides has been largely proposed for acetone sensing, although some major technical challenges such as high operating temperature still remain unsolved. This work presents the development of an electrochemical sensor based on nanostructured PANI/cellulose/WO 3 composite for acetone detection at room temperature. The synthesized materials for sensor preparation were polyaniline (PANI) with a conductivity of 13.9 S/cm and tungsten trioxide (WO 3 ) in monoclinic phase doped with cellulose as carbon source. The synthesized materials were characterized by high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), cyclic voltammetry (CV), and Raman spectroscopy. The composite was applied for acetone detection in the range of 0 to 100 ppmv at room temperature with electrochemical impedance spectroscopy (EIS) for monitoring resistance changes proportional to acetone concentration. The developed sensor achieved a calculated limit of detection of 10 ppm and 2 of 0.99415 with a RSD of 5% ( = 3) at room temperature. According to these results, the developed sensor is suitable for acetone sensing at room temperatures without the major shortcomings of larger systems required by high operating temperatures.

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The effect of relative humidity on the NO2 sensitivity of a SnO2/WO3 heterojunction gas sensor

Cited by 107 publications

References 21 publications

Electrical response of Sm2O3-doped SnO2 to C2H2 and effect of humidity interference

Electrical response of Sm2O3-doped SnO2 to C2H2 and effect of humidity interference

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

Room Temperature Detection of Acetone by a PANI/Cellulose/WO₃Electrochemical Sensor

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The effect of relative humidity on the NO2 sensitivity of a SnO2/WO3 heterojunction gas sensor

Cited by 107 publications

References 21 publications

Electrical response of Sm2O3-doped SnO2 to C2H2 and effect of humidity interference

Electrical response of Sm2O3-doped SnO2 to C2H2 and effect of humidity interference

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

Room Temperature Detection of Acetone by a PANI/Cellulose/WO3Electrochemical Sensor

Contact Info

Product

Resources

About

Room Temperature Detection of Acetone by a PANI/Cellulose/WO₃Electrochemical Sensor