Synthesis of hollow and hollowed-out Co3O4 microspheres assembled by porous ultrathin nanosheets for ethanol gas sensors: Responding and recovering in one second

Tan, Jianfeng; Dun, Menghan; Li, Long; Zhao, Jingya; Tan, Wenhu; Lin, Zhidong; Huang, Xintang

doi:10.1016/j.snb.2017.04.063

Cited by 80 publications

(26 citation statements)

References 70 publications

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“…Hollow and hollowed-out Co 3 O 4 microspheres were assembled by porous ultrathin nanosheets with a thickness of about 3 nm that were synthesized via a new rapid and energy-efficient room temperature interfacial-reaction. As expected, the gas sensor based on these assembled materials exhibited a high response and ultra-fast response/recovery speed (both the response and recovery time were 1 s) when detecting a low concentration of ethanol [73].…”

Section: Assembled Thin 2d Materialssupporting

confidence: 76%

“…Huang and coworkers prepared hierarchical nanorods assembled by interlaced ultrathin nanosheets (with a thickness of around 3 nm), that possessed a large specific surface area and a novel open-style pore structure, which endowed it with large amount of gas adsorption and rapid gas diffusion [73,74]. Hollow and hollowed-out Co 3 O 4 microspheres were assembled by porous ultrathin nanosheets with a thickness of about 3 nm that were synthesized via a new rapid and energy-efficient room temperature interfacial-reaction.…”

Section: Assembled Thin 2d Materialsmentioning

confidence: 99%

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Thin 2D: The New Dimensionality in Gas Sensing

Neri

2017

Chemosensors

114

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Abstract:Since the first report of graphene, thin two-dimensional (2D) nanomaterials with atomic or molecular thicknesses have attracted great research interest for gas sensing applications. This was due to the distinctive physical, chemical, and electronic properties related to their ultrathin thickness, which positively affect the gas sensing performances. This feature article discusses the latest developments in this field, focusing on the properties, preparation, and sensing applications of thin 2D inorganic nanomaterials such as single-or few-layer layered double hydroxides/transition metal oxides/transition metal dichalcogenides. Recent studies have shown that thin 2D inorganic nanomaterials could provide monitoring of harmful/toxic gases with high sensitivity and a low concentration detection limit by means of conductometric sensors operating at relatively low working temperatures. Promisingly, by using these thin 2D inorganic nanomaterials, it may open a simple way of improving the sensing capabilities of conductometric gas sensors.

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Section: Assembled Thin 2d Materialssupporting

confidence: 76%

Section: Assembled Thin 2d Materialsmentioning

confidence: 99%

Thin 2D: The New Dimensionality in Gas Sensing

Neri

2017

Chemosensors

114

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“…There are a number of works devoted to the study of the sensor properties of Co 3 O 4 to various gases in dry air—volatile organic compounds (VOCs): xylene [17], ethanol [18,19,20], methanol [20], acetone [17,21], as well as NH 3 [22], NO x [23], H 2 S [24], CO [16], etc. At the same time, only few articles have been devoted to the study of the sensor properties to CO of pure cobalt oxide in humid air [14,25].…”

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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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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“…It has been widely reported that researchers can improve the performance of gas sensors by constantly optimizing the micro-hotplatform (MHP) (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) structure and the morphology of sensing materials. (15)(16)(17)(18)(19) For example, in earlier research on MEMS gas sensors, Lee et al (4) described the great advantage of low power consumption compared with traditional gas sensors. Behera and Chandra reported that the heating resistor formed on a SiO 2 platform of 6 μm thickness can save 43.5% of power through planar MEMS technology.…”

Section: Introductionmentioning

confidence: 99%

“…Tan et al reported that an ultrathin nanosheet material mode realized by assembling hollow and hollowed-out Co 3 O 4 microspheres exhibited a high response to ethanol. (18) The sensing film was synthesized by hierarchically mixing Pd/SnO 2 (HM-PTO) composites, as reported by Xiao et al (19) However, the methods of synthesizing the above materials were somewhat complicated, and the growth process needed to be controlled precisely. The SnO 2 nanoparticles were synthesized by a simple hydrothermal method in this study, compared with the above.…”

Section: Introductionmentioning

confidence: 99%

Integration of SnO2 Nanoparticles with Micro-hotplatform for Low-power-consumption Gas Sensors

Peng¹,

Xie²,

Wang³

et al. 2018

Sensors and Materials

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A gas sensor with low power consumption was manufactured using a suspended microhotplatform (MHP) fabricated by MEMS technology. Tin oxide nanoparticles, synthesized by the hydrothermal method, were deposited on the MHP by dip coating in the form of slurry. The obtained SEM images indicated that nanoparticles were well connected and uniform in size. The gas sensing performance was also investigated in both dynamic and static test systems. In the dynamic test system, the response (R air /R gas) of the sensor exhibited a representative linear relationship with hydrogen at a power of 14.42 mW and changed from 1.17 to 4.51 at 5 to 100 ppm hydrogen. In the static test system, the sensor demonstrated an obvious response to ethanol, ammonia, and glycol; the response to the target gas of ammonia at a concentration of 120 ppm reached up to 23.94. The power consumption of the sensor was only 16 mW with a platinum (Pt) heating resistor at 255 ℃.

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Synthesis of hollow and hollowed-out Co3O4 microspheres assembled by porous ultrathin nanosheets for ethanol gas sensors: Responding and recovering in one second

Cited by 80 publications

References 70 publications

Thin 2D: The New Dimensionality in Gas Sensing

Thin 2D: The New Dimensionality in Gas Sensing

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

Integration of SnO2 Nanoparticles with Micro-hotplatform for Low-power-consumption Gas Sensors

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