Gas sensors using hierarchical and hollow oxide nanostructures: Overview

Lee, Jong Heun

doi:10.1016/j.snb.2009.04.026

Cited by 1,371 publications

(764 citation statements)

References 187 publications

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“…This result matches with the trend in the increase of Ce 3+ , because the formation of oxygen-vacancies is considered as an elementary step in the reduction of Ce 4+ . This agrees with the well-known property of CeO2 when doped with aliovalent cations, such as La 3+ [18]. The Al 2p spectra for the Ce:Al = 200:1 and Ce:Al = 50:1 (Fig.…”

Section: Resultssupporting

confidence: 89%

“…Hollow structures constructed from tiny nanocrystals are of great scientific and practical value because they possess lower diffusion barrier limits and facilitate mass transport to and from the active sites [16,17], which is quite important for applications such as gas sensing [18], catalysis [19], energy storage [20,21], and drug delivery [22]. Among the various hollow structures, multi-shelled spheres are considered as one of the most promising and extraordinary candidates, especially for catalytic applications, due to their high-order, hollow, hierarchical structure, which may lead to functional materials with optimized properties [23].…”

Section: Introductionmentioning

confidence: 99%

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Highly active CeO2 hollow-shell spheres with Al doping

Wang

Jiang

et al. 2017

Sci. China Mater.

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Metal oxide hollow structures are of great interest in many current and emerging areas of technology. This paper presents a facile and controlled protocol for the synthesis of Al-doped CeO2 hollow-shell spheres (CHS), where the dopant confers enhanced stability and activity to the material. These Al-doped CeO2 hollow-shell spheres (ACHS) possess a controllable shell number of up to three, where the sizes of the exterior, middle, and interior spheres were about 250-100 nm,150-50 nm, and 40-10 nm, respectively, and the average shell thickness was~15 nm. The thermal stability of the ACHS structure was enhanced by the homogeneous incorporation of Al atoms, and more active oxygen species were present compared with those in the non-doped congener. Au NPs supported on ACHS (Au/ACHS) showed superior catalytic performance for the reduction of p-nitrophenol. For the same Au NP content, the reaction rate constant (k) of the Au/ACHS was nearly twice that of the non-doped Au/CHS, indicating that Al doping is promising for improving the performance of inert or unstable oxides as catalyst supports.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Highly active CeO2 hollow-shell spheres with Al doping

Wang

Jiang

et al. 2017

Sci. China Mater.

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“…Choi & Jang, 2010;Comini et al, 2009;Fine, Cavanagh, Afonja, & Binions, 2010;Franke, Koplin, & Simon, 2006; Kanan, El-Kadri, Abu-Yousef, & Kanan, 2009; G Korotcenkov & Cho, 2011;J.-H. Lee, 2009;Tricoli, Righettoni, & Teleki, 2010;Wetchakun et al, 2011). The sensing characteristics of such sensors can be optimized by controlling their morphology, surface to volume ratio, and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

The Review of Semiconductor Gas Sensor for Nox Detcting

Niyat¹,

Hadi²,

Abadi³

2016

TOJDAC

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During the last century, many semiconductor gas sensors have been presented based on various materials and technologies to detect gas components. Many of them are made to support human's life in different ways. In the last years, the number of sensors which can detect various gas species has increased dramatically especially with respect to global issues of environment and earth atmosphere, the necessity of those gas sensors which can detect air pollutants such as NO x gases in environment is felt. They are essentially required in order to control the systems of combustion exhausted from industry, stationary facilities and automobiles. So it is necessary for the scientists to design and fabricate the gas sensors which are of low cost, selective, sensitive, and accurate especially in low level concentrations of target gases, easy to process and of high recovery and response time, good electrical properties, and above all tunable structure at the nano scale. In this sense, this paper has presented various classifications of gas sensors and various semiconductor oxides for NO x detecting and their technology to convey a comprehensive idea about the semiconductor metals as well as metal oxides for NO x detecting along with their characteristics, structures etc. in order to clarify the future road map towards on the semiconductor materials for NO x detecting. Keywords: sensor, NO x gases, semiconductor, metal oxides INTRODUCTIONIn the last few decades, many studies have been focused on the semiconducting metal oxides which are known as effective gas sensing materials especially for NO x detecting due to their electrical conductivities which are open to change greatly with the changes of atmosphere (K. J. Choi & Jang, 2010;Comini et al., 2009;Fine, Cavanagh, Afonja, & Binions, 2010;Franke, Koplin, & Simon, 2006; Kanan, El-Kadri, Abu-Yousef, & Kanan, 2009; G Korotcenkov & Cho, 2011;J.-H. Lee, 2009;Tricoli, Righettoni, & Teleki, 2010;Wetchakun et al., 2011). The sensing characteristics of such sensors can be optimized by controlling their morphology, surface to volume ratio, and electrical properties. The developments in nanotechnology, fabrication methods, and synthesis provide a suitable atmosphere to construct those sensors with their mentioned sensing characteristics easier.

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“…The receptor function is related to the ability of the oxide surface to interact with target gases (metal additives and decoration). Over the past decade, metal oxide nanostructures such as nanoparticles, nanowires, nanotubes, and nanofibers with metal catalysts have significantly improved the three basic factors, leading to high-performance gas sensors [14]. However, since these nanostructures are commonly synthesized using wet chemical methods or transfer methods, developing versatile and reproducible fabrication processes has remained a challenge [15].…”

Section: Introductionmentioning

confidence: 99%

Design of Metal Oxide Hollow Structures Using Soft-templating Method for High-Performance Gas Sensors

Shim¹,

Jang²

2016

Journal of Sensor Science and Technology

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Semiconductor gas sensors based on metal oxide are widely used in a number of applications, from health and safety to energy efficiency and emission control. Nanomaterials including nanowires, nanorods, and nanoparticles have dominated the research focus in this field owing to their large number of surface sites that facilitate surface reactions. Recently, metal oxide hollow structures using soft templates have been developed owing to their high sensing properties with large-area uniformity. Here, we provide a brief overview of metal oxide hollow structures and their gas-sensing properties from the aspects of template size, morphology, and additives. In addition, a gassensing mechanism and perspectives are presented.

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Gas sensors using hierarchical and hollow oxide nanostructures: Overview

Cited by 1,371 publications

References 187 publications

Highly active CeO2 hollow-shell spheres with Al doping

Highly active CeO2 hollow-shell spheres with Al doping

The Review of Semiconductor Gas Sensor for Nox Detcting

Design of Metal Oxide Hollow Structures Using Soft-templating Method for High-Performance Gas Sensors

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