Journal ArticleDOI
Carbon monoxide detection at low temperatures by semiconductor sensor with nanostructured Au-doped CoOOH films
TLDR
In this paper, a series of cobalt oxyhydroxide (CoOOH) nano-films containing a small percentage of Au by mass were prepared from the component oxides through special precipitation and were sintered on the sensor substrate between Pt electrodes at 300°C for 2.h.Abstract:
A series of cobalt oxyhydroxide (CoOOH) nano-films (250–450 nm thick) containing a small percentage of Au by mass were prepared from the component oxides through special precipitation and were sintered on the sensor substrate between Pt electrodes at 300 °C for 2 h. The sensor response to CO and other combustion by-product pollutants typical for early stages of fire, defined as R g / R a , where R g and R a denote the sensor electrical resistance in the sample gas and in air, respectively, was strongly promoted by addition of a small amount of Au to the CoOOH nanostructures. The results revealed that the sensors attached with Au-doped CoOOH sensing electrode (SE) have good sensitivity to CO in the temperature range of 60–110 °C with the maximum CO response near 80 °C. Cross-sensitivity investigation of these sensors to various gases has shown that the sensitivity of the nanostructured Au-loaded CoOOH-SE to CO is the highest among other gases. As the amount of Au loaded increased up to 0.5%, the device was found to be more sensitive to CO, whilst the addition of 1 mass% Au substantially degraded the sensing properties of the device. The promoting effects of Au were discussed based on the behaviour of electrical resistance of the Au-loaded sensors. The results of this work may be applicable to further development of carbon monoxide sensors for fire detection at its earlier stages.read more
Citations
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Solid-state sensors monitoring parameters of water quality for the next generation of wireless sensor networks
TL;DR: In this paper, a review of solid-state sensors for on-line monitoring of such water quality parameters as pH, dissolved oxygen (DO), conductivity, turbidity, dissolved organic carbon (DOC) and dissolved metal ions on the high spatial resolution were analyzed.
Journal ArticleDOI
Conductometric gas sensors based on metal oxides modified with gold nanoparticles: a review
TL;DR: In this paper, a review of surface functionalizaton of metal oxides by gold nanoparticles and the application of the resulting nanomaterials in resistive gas sensors is presented.
Journal ArticleDOI
Polyaniline-multiwalled carbon nanotube (PANI-MWCNT): Room temperature resistive carbon monoxide (CO) sensor
Atanu Roy,Apurba Ray,Priyabrata Sadhukhan,Kaushik Naskar,Gobardhan Lal,Radhaballabh Bhar,Chittaranjan Sinha,Sachindranath Das +7 more
TL;DR: In this article, the synthesis, characterization and CO sensing properties of polyaniline (PANI) coated multiwalled carbon nanotube (MWCNT) were demonstrated.
Journal ArticleDOI
Effect of ‘Pt’ loading in ZnO–CuO hetero-junction material sensing carbon monoxide at room temperature
TL;DR: In this article, the sensor response obtained for an optimized ratio of ZnO and CuO (1:1 weight ratio) yielded the highest response of 1.28 (Rco/Rair) for 1000ppm of CO at room temperature; the response and recovery times were found to be 41 and 86 s, respectively.
Journal ArticleDOI
Structural, morphological, and electrical characteristics of the electrodeposited cobalt oxide electrode for supercapacitor applications
TL;DR: In this article, the structural and morphological properties of the cobalt oxide thin film were studied using an X-ray diffractometer and scanning electron microscopy, and the results showed that the electrodeposited cobalt dioxide film had a nanocrystalline and porous structure.
References
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Gas response control through structural and chemical modification of metal oxide films: state of the art and approaches
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Electrochemical surface properties of Co3O4 electrodes
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