Use of cobalt oxide CoOOH in a carbon monoxide sensor operating at low temperatures

Wu, Ren‐Jang; Wu, Jhih-Gan; Tsai, Tung-Kang; Yeh, Chun-Chieh

doi:10.1016/j.snb.2006.01.053

Cited by 65 publications

(50 citation statements)

References 18 publications

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“…Cobalt oxyhydroxide, CoO(OH), has a hexagonal structure in which a divalent metal cation is located at an octahedral site which is coordinated by six hydroxyl oxygen [2]. CoO(OH) has been proposed as an alternative material for CO detection at low temperatures, for improving Co 3 O 4 -based gas sensor [5]. Well-spread CoO(OH) can be used as the conductive network in rechargeable alkaline batteries [6].…”

Section: Introductionmentioning

confidence: 99%

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Ekwealor

Offiah

Ezugwu

et al. 2014

Indian Journal of Materials Science

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The effects of thermal treatment on the optical and structural properties of cobalt oxide Co O thin films synthesized in the pores of PVP by chemical bath deposition technique were investigated. Films deposited were crystalline. The optical properties of the films were got from absorbance, transmittance reflectance, refractive index, absorption coefficient, and extinction coefficient measurements. The synthesized Co O films turned out to be cobalt oxyhydroxide , CoO(OH), nanocrystals. The crystals obtained were of size 41.84 nm; however, as annealing temperature increased, the size decreased to 16.28 nm. The absorption coefficient, refractive index, and extinction coefficient were found to increase with increase in annealing temperature though not sequentially. For the same energy ranges of the incident photons, the absorption coefficient and refractive index ranged from 0.2 to 1.8 and from 1.4 to 2.3, respectively. The energy band-gap of the films ranged from 1.96 eV to 2.22 eV.

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Section: Introductionmentioning

confidence: 99%

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Ekwealor

Offiah

Ezugwu

et al. 2014

Indian Journal of Materials Science

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“…In addition, due to the low production cost, high stability, good electrical properties, low resistivity, and remarkable redox properties of metal oxide particles and nanoparticles, they are suitable for application in gas sensors [7][8][9]. Metal oxide or electron transfer mediators immobilized onto metal oxide films are suitable materials for sensors fabrication and electrode modification technologies [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Cobalt oxide nanostructure-modified glassy carbon electrode as a highly sensitive flow injection amperometric sensor for the picomolar detection of insulin

Salimi

Hallaj

2011

J Solid State Electrochem

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Glassy carbon electrode modified with electrodeposited cobalt oxide nanostructure shows an excellent electrocatalytic activity toward insulin oxidation at a wide pH range. Cyclic voltammetry, hydrodynamic amperometry, and flow injection analysis (FIA) were used for insulin determination at a picomolar and higher-concentration range. Amperometric determination of insulin at this modified electrode yielded a calibration curve with the following characteristics; linear range, 100 pM-15 nM; sensitivity of 83.9 nA nM −1 and detection limit 10 pM. FIA yielded the calibration curve with sensitivity and detection limit of 2.0 nA nM −1 and 25 pM, respectively. Furthermore, the RSD of repetitive FIA for 200 pM insulin (n=13) is 2%. In addition, the interference effect of electroactive existing species (lactic acid, cholesterol, ascorbic acid, uric acid, and glucose) was eliminated by covering the surface of the modified electrode with nafion film. Fast response time, signal stability, high sensitivity, low cost, and ease of preparation are the advantages of the proposed insulin sensor.

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“…Secondly, these slices were carefully dipped into a closed vessel containing a solution of the precursor, which were prepared by dissolving cobalt nitrate (Co(NO 3 ) 2 Á 6H 2 O) in 100 mL water-free ethanol solutions, for 10 and 20 dip-coating cycles at room temperature. The CoOOH was obtained from Co(NO 3 ) 2 by a hydrothermal method [22]. By altering dip-coating cycles values, two different types of final products were fabricated, which were labeled as wing-templated CoOOH-10, and wing-templated CoOOH-20, respectively.…”

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confidence: 99%

Hierarchically porous cobalt oxyhydroxide derived from Morpho‐butterfly wings: Preparation, characterization, and carbon monoxide detection at low temperatures

Wang

Kuo

2012

Physica Status Solidi (a)

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Hierarchical porous cobalt oxyhydroxide (CoOOH) has been successfully synthesized using a Morpho-butterfly wing as template via a sol-gel dip-coating process followed by a hydrothermal approach. The precursor concentrations and dipcoating cycles have a large effect on the morphologies and porous structures of wings-templated CoOOH according to field emission scanning electron microscopy (FE-SEM), mercury porosimetry, and Brunauer-Emmett-Teller (BET) nitrogen adsorption-desorption investigations. Cross-sensitivity of the wings-templated and non-templated CoOOH sensors to various gases coexisting with the environments was investigated. It is revealed that wings-templated CoOOH has excellent sensitivity and selectivity to carbon monoxide (CO) due to inheritance of the wing's hierarchical porous structure. The sensing response (S) to CO of wings-templated CoOOH is about 1.48 times higher than that of non-templated CoOOH. The optimum working temperature of the wings-templated CoOOH and wings-templated Zn-doped CoOOH for CO detection was roughly 70 8C. The wings-templated Zn-doped CoOOH also exhibited high sensitivity (5.68) and selectivity for CO relative to H 2 (S CO S H 2 ¼ 4.37). The selective sensing mechanism has been discussed in terms of gas-solid reactions, grain size, and hierarchical porous microstructures.

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Use of cobalt oxide CoOOH in a carbon monoxide sensor operating at low temperatures

Cited by 65 publications

References 18 publications

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Cobalt oxide nanostructure-modified glassy carbon electrode as a highly sensitive flow injection amperometric sensor for the picomolar detection of insulin

Hierarchically porous cobalt oxyhydroxide derived from Morpho‐butterfly wings: Preparation, characterization, and carbon monoxide detection at low temperatures

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