Single-crystalline porous nanosheets assembled hierarchical Co3O4 microspheres for enhanced gas-sensing properties to trace xylene

Xu, Keng; Zou, Jingping; Tian, Shouqin; Yang, Yong; Zeng, Fanyan; Yu, Ting; Zhang, Yuting; Jie, Xiaomeng; Yuan, Cailei

doi:10.1016/j.snb.2017.02.071

Cited by 63 publications

(22 citation statements)

References 52 publications

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“…Moreover, the design of highly gas accessible structures with minimal aggregation between nanostructures is also very important in achieving high gas response. Indeed, there have been many reports on enhancing the gas responses of p-type oxide semiconductors using highly gas accessible hierarchical, [92][93][94][95][96] mesoporous, [97][98][99][100] monolayer inverse opal, [101] macroporous, [102] hollow, [103,104] fibrous, [105] and well-dispersed [106,107] nanostructures.…”

Section: P-type Oxide Semiconductor Chemiresistorsmentioning

confidence: 99%

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

2020

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With rapid progress in device integration and computing power, the realization of highly miniaturized one-chip artificial olfaction with superior performance is close and should be further supported by the rational design of chemical sensors and chemical sensing materials. The number of gas sensors tends to increase in order to sniff more complex odors with the progress of civilization. This explains the evolution from a single chemical sensor to complicated artificial olfaction using sensor arrays. At the advent of oxide chemiresistive gas sensors in the 1960s and 1970s, a single gas sensor was widely used to detect toxic, explosive, dangerous, and harmful gases, such as CO, C 3 H 8 , CH 4 , H 2 S, and NO 2 , in a selective manner. [26,27] However, a single sensor is often insufficient for recognizing most of the natural odors encountered in daily life, which consist of hundreds to thousands of different chemicals. [28] In the mammalian olfactory system, odorants are initially detected by olfactory receptors (ORs) covering the surface of the cilia projected from olfactory sensory neurons (OSNs), which are located in the olfactory epithelium lining the nasal cavity. These signals are transmitted to the glomeruli in the olfactory bulb, where a high degree of signal integration happens (Figure 1a). [29] Finally, the signals are sent through mitral cells to a higher brain region (olfactory cortex), and the signals are subsequently combined or modified in a variety of ways by parallel processing for analysis and interpretation (Figure 1b). [30] Each OR can detect various kinds of odorants, and similarly, each odorant can also be recognized by a number of ORs. That is, the olfactory system determines multiple odorants from various combinations of ORs (Figure 1c). [31] For better olfaction, both OSNs and ORs should be abundant. A larger number of OSNs is advantageous for detecting trace concentrations of analytes and ligands. [32] For instance, dogs with more OSNs are better than humans at detecting explosives, searching and rescuing, diagnosing disease, and assessing agricultural products. [33] If a mammal can detect larger numbers of faint gas components within odors, he can perceive and identify the odors more accurately. From this perspective, gas sensors with lower detection limits would be assembled to the stronger artificial olfaction. Kinds of ORs are also important. Mammals are known to have ≈1000 different kinds of ORs, and combinations of dissimilar ORs enable the discrimination of a myriad of odorants. [29] To mimic this, sensor arrays consisting of small number (5-20) of sensors that show Artificial olfaction based on gas sensor arrays aims to substitute for, support, and surpass human olfaction. Like mammalian olfaction, a larger number of sensors and more signal processing are crucial for strengthening artificial olfaction. Due to rapid progress in computing capabilities and machinelearning algorithms, on-demand high-performance artificial olfaction that can eclipse human olfaction becomes inevitable onc...

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Section: P-type Oxide Semiconductor Chemiresistorsmentioning

confidence: 99%

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

2020

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“…The CoCeO x -TA catalyst was synthesized by a template method with cobalt acetate as the precursor . Polyvinyl pyrrolidone (PVP) was used as the guiding agent.…”

Section: Methodsmentioning

confidence: 99%

“…The CoCeO x -TA catalyst was synthesized by a template method with cobalt acetate as the precursor. 19 Polyvinyl pyrrolidone (PVP) was used as the The CoCeO x -SS catalyst was synthesized by a solid-state grinding method with cobalt sulfate as the precursor. 20 Cobalt sulfate (20 mmol, CoSO O) were added into an agate mortar.…”

Section: Methodsmentioning

confidence: 99%

Promotional Effect of Preparation Methods on Catalytic Reduction of NO by CO over CoCeO_x Catalysts

Zeng

Zhong

et al. 2019

Ind. Eng. Chem. Res.

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In this study, a series of CoCeO x catalysts were prepared by template, solid-state grinding with cobalt sulfate or cobalt acetate as the precursor and the oil bath method for catalytic reduction of NO x by CO (CO–NO). These catalysts were characterized by X-ray diffraction, Brunauer–Emmett–Teller, Raman spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed reduction of H2, and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results indicated that CoCeO x -TA and CoCeO x -SS catalysts exhibited much higher activity, which were attributed to excellent reducibility property, abundant chemical adsorbed oxygen, and NO absorption sites. In the presence of O2, the activity decreased obviously over CoCeO x -TA, CoCeO x -SS, and CoCeO x -SA catalysts. However, the activity increased at high temperatures over the CoCeO x -OA catalyst. According to the result of in situ DRIFTS, nitrate species decreased over CoCeO x -TA, CoCeO x -SS, and CoCeO x -SA catalysts in the presence of O2, which might inhibit the reduction efficiency of NO. Moreover, NO adsorption was not affected by O2 over CoCeO x -OA catalyst, which could contribute to its high activity in the CO-selective catalytic reduction reaction.

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“…All the chemical reagents were purchased from Sinopharm Chemical Reagent and used without further purification. During the synthesis processes (Xu et al, 2017), a mixed solution (80 ml) composed of distilled water and ethylene glycol (1: 79) was added at 0.05 g PVP, as well as 1 g cobalt acetate. The mixed solution was then stirred and poured into a Teflon-lined stainless-steel autoclave (100 mL).…”

Section: Methodsmentioning

confidence: 99%

One-Dimensional Zinc Oxide Decorated Cobalt Oxide Nanospheres for Enhanced Gas-Sensing Properties

Zhou

Yang

et al. 2018

Front. Chem.

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In this study, one-dimensional (1D) zinc oxide was loaded on the surface of cobalt oxide microspheres, which were assembled by single-crystalline porous nanosheets, via a simple heteroepitaxial growth process. This elaborate structure possessed an excellent transducer function from the single-crystalline feature of Co3O4 nanosheets and the receptor function from the zinc oxide nanorods. The structure of the as-prepared hybrid was confirmed via a Scanning Electron Microscope (SEM), X-ray diffraction (XRD), and a Transmission Electron Microscope (TEM). Gas-sensing tests showed that the gas-sensing properties of the as-designed hybrid were largely improved. The response was about 161 (Ra/Rg) to 100 ppm ethanol, which is 110 and 10 times higher than that of Co3O4 (Rg/Ra = 1.47) and ZnO (Ra/Rg = 15), respectively. And the as-designed ZnO/Co3O4 hybrid also showed a high selectivity to ethanol. The superior gas-sensing properties were mainly attributed to the as-designed nanostructures that contained a super transducer function and a super receptor function. The design strategy for gas-sensing materials in this work shed a new light on the exploration of high-performance gas sensors.

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Single-crystalline porous nanosheets assembled hierarchical Co3O4 microspheres for enhanced gas-sensing properties to trace xylene

Cited by 63 publications

References 52 publications

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

Promotional Effect of Preparation Methods on Catalytic Reduction of NO by CO over CoCeO_x Catalysts

One-Dimensional Zinc Oxide Decorated Cobalt Oxide Nanospheres for Enhanced Gas-Sensing Properties

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Single-crystalline porous nanosheets assembled hierarchical Co3O4 microspheres for enhanced gas-sensing properties to trace xylene

Cited by 63 publications

References 52 publications

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

Promotional Effect of Preparation Methods on Catalytic Reduction of NO by CO over CoCeOx Catalysts

One-Dimensional Zinc Oxide Decorated Cobalt Oxide Nanospheres for Enhanced Gas-Sensing Properties

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Promotional Effect of Preparation Methods on Catalytic Reduction of NO by CO over CoCeO_x Catalysts