The advances of Co 3 O 4 as gas sensing materials: A review

Xu, Jiankang; Cheng, J.P.

doi:10.1016/j.jallcom.2016.06.086

Cited by 206 publications

(80 citation statements)

References 130 publications

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“…The limitation of application of p-type semiconductor oxides CuO, NiO, Co 3 O 4 etc. is mainly due to their high electrical resistance and lower sensitivity to gases in dry air in comparison with n-type oxides [11]. However, they are characterized by a higher concentration of chemisorbed oxygen [12], and exhibit high catalytic activity in oxidation reactions [13], which makes them promising materials for detecting gases in humid air.…”

Section: Introductionmentioning

confidence: 99%

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Co3O4 as p-Type Material for CO Sensing in Humid Air

Vladimirova

Krivetskiy

Rumyantseva

et al. 2017

Sensors

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Nanocrystalline cobalt oxide Co3O4 has been prepared by precipitation and subsequent thermal decomposition of a carbonate precursor, and has been characterized in detail using XRD, transmission electron microscopy, and FTIR spectroscopy. The sensory characteristics of the material towards carbon monoxide in the concentration range 6.7–20 ppm have been examined in both dry and humid air. A sensor signal is achieved in dry air at sufficiently low temperatures T = 80–120 °C, but the increase in relative humidity results in the disappearance of sensor signal in this temperature range. At temperatures above 200 °C the inversion of the sensor signal in dry air was observed. In the temperature interval 180–200 °C the sensor signal toward CO is nearly the same at 0, 20 and 60% r.h. The obtained results are discussed in relation with the specific features of the adsorption of CO, oxygen, and water molecules on the surface of Co3O4. The independence of the sensor signal from the air humidity combined with a sufficiently short response time at a moderate operating temperature makes Co3O4 a very promising material for CO detection in conditions of variable humidity.

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Section: Introductionmentioning

confidence: 99%

“…The Co 2+ ions occupy one-eighth of the tetrahedral sites and Co 3+ ions occupy a half of the octahedral sites [14]. The value of the band gap for cobalt oxide is 1.6–2.2 eV [11]. Among semiconductor oxides cobalt (II,III) oxide is one of the most active catalysts for the oxidation of carbon monoxide [15].…”

Section: Introductionmentioning

confidence: 99%

Co3O4 as p-Type Material for CO Sensing in Humid Air

Vladimirova

Krivetskiy

Rumyantseva

et al. 2017

Sensors

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“…Как и многие неорганические полупроводники [5], оксид кобальта весьма перспективен для создания газовых сенсоров, и сенсоры на его основе имеют весьма высокую чувствительность и селективность [6,7]. Предложен ряд механизмов чувствительности Co 3 O 4 к различным газам [7,8].…”

Section: Introductionunclassified

“…Предложен ряд механизмов чувствительности Co 3 O 4 к различным газам [7,8]. Гетерогенные наноструктуры на основе Co 3 O 4 и различных полупроводников как p-типа проводимости [6], так и n-типа, таких как ZnO [9][10][11][12][13][14], имеют улучшенные характеристики по газочувствительности и селективности. Созданы газовые детекторы этанола [9] с рабочей температурой 200 • С формальдегида [10] в диапазоне температур 160−360 • С. В [11] описан датчик на CO и NO 2 с работой при 150 • С и выше.…”

Section: Introductionunclassified

Синтез гетерогенных наноструктур ZnO/Co-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=- методом химического осаждения из растворов

Абдуллин¹,

Жумагулов²,

Ismailova³

et al. 2020

Журнал Технической Физики

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Nanocrystalline cobalt oxide Co3O4 and the ZnO / Co3O4 composite were obtained by the chemical bath deposition method followed by thermal annealing. It has been shown that the growth mechanism of cobalt carbonates changes dramatically in the presence of zinc oxide particles during synthesis, as a result, the phase composition, morphology, and material properties change. The conductive layers formed from the ZnO / Co3O4 composite have an electrical resistance at room temperature that is more than three orders of magnitude lower than the resistance of the Co3O4 layers, and ZnO / Co3O4 composite gas sensors showed significantly higher gas sensitivity at room temperature than that of control cobalt oxide sensors.

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“…Great emphasis is being given to nanostructured metal oxides as a sensor material because of their high response and low working temperature. Thus, various n-type and p-type metal oxide nanomaterials, such as SnO 2 , Co 3 O 4 , and WO 3 , as well as their composites have been intensively explored for use in gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Gas Sensing Properties of Nickel Vanadate and Composite of Nickel Vanadate/Polypyrrole

2018

Sensors and Materials

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In this work, Ni 3 V 2 O 8 particles were synthesized by a chemical method and sintered, and then, polypyrrole (PPy) films were deposited onto the surface of the Ni 3 V 2 O 8 particles by in situ chemical polymerization. The morphology and structure of these materials were characterized. Morphological observation proved that the PPy film was well dispersed and completely coated onto the surface of the Ni 3 V 2 O 8 particles. The Ni 3 V 2 O 8 particles showed high response to volatile organic gases at 300 ℃. The composite of Ni 3 V 2 O 8 /PPy exhibited high response to NH 3 and NO at 150 ℃, showing great potential for detecting these gases.

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The advances of Co 3 O 4 as gas sensing materials: A review

Cited by 206 publications

References 130 publications

Co3O4 as p-Type Material for CO Sensing in Humid Air

Co3O4 as p-Type Material for CO Sensing in Humid Air

Синтез гетерогенных наноструктур ZnO/Co-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=- методом химического осаждения из растворов

Gas Sensing Properties of Nickel Vanadate and Composite of Nickel Vanadate/Polypyrrole

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