Synthesis of mesostructured indium oxide doped with rare earth metals for gas detection

Yang, Haifeng; Zhang, Xuan; Li, Junfang; Li, Wentao; Xi, Guangcheng; Yan, Yan; Bai, Hua

doi:10.1016/j.micromeso.2014.08.021

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…Chen, Wang, & Zhang, 2009;Gu, Nie, Han, & Wang, 2015;Yang et al, 2014). In the past decades, the global scientific community have widely investigated on Indium oxides due to their promising electronic and optical properties and extensive application in electro-optical modulators, solar cells, low windows, gas sensors, optoelectronic devices, flat panel display materials, light-emitting diodes, etc.…”

Section: In 2 O 3 Gas Sensors For No X Detectingmentioning

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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Section: In 2 O 3 Gas Sensors For No X Detectingmentioning

confidence: 99%

The Review of Semiconductor Gas Sensor for Nox Detcting

Niyat¹,

Hadi²,

Abadi³

2016

TOJDAC

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“…However, these methods usually lead to an ill-defined porous structure and uncontrolled morphology and porosity. By using hard-templating methods, ordered mesoporous In 2 O 3 materials were synthesized through a structure replication from hexagonal mesoporous SBA-15 silica or cubic KIT-6 silica, ,− and the materials were found to be remarkable electrochemical and gas-sensing performances owning to the ordered and interconnected mesopores. , Moreover, ordered mesoporous In 2 O 3 materials doped by rare earth metals (Dy, Nd, Pr) or transition metals (Fe, Ni) doped were synthesized via hard templating methods to enhance their gas-sensing properties. − By controlling the synthesis conditions, ordered mesoporous In 2 O 3 with regular morphology and bead-chain-like In 2 O 3 nanorods were produced through this approach. − However, the hard-templating method is complicated, costly, and not suitable for mass production, which poses limitations for their practical applications. By contrast, soft-templating synthesis based on surfactants or amphiphilic block copolymers as templates is more flexible and suitable for large scale production of ordered mesoporous materials.…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic Block Copolymer Templated Synthesis of Mesoporous Indium Oxides with Nanosheet-Assembled Pore Walls

et al. 2016

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A solvent evaporation induced coassembly approach combined with a comburent CaO 2 -assisted calcination strategy was employed for the synthesis of ordered mesoporous indium oxides by using lab-made high-molcular weight amphiphilic diblock copolymer poly(ethylene oxide)-b-polystyrene (PEO-b-PS) as a template, indium chloride as an indium source, and THF/ethanol as the solvent. The obtained mesoporous indium oxide materials exhibit a large pore size of ∼14.5 nm, a surface area of 48 m 2 g −1 , and a highly crystalline In 2 O 3 nanosheets framework, which can facilitate the diffusion and transport of gas molecules. By using an integrated microheater as the chemresistance sensing platform, the obtained mesoporous indium oxides were used as sensing materials and showed an excellent performance toward NO 2 at a low working temperature (150 °C) due to their high porosity and unique crystalline framework. The limit of detection (LOD) of the microsensor based on mesoporous indium oxides can reach a concentration as low as 50 ppb of NO 2 . Moreover, the microsensor shows a fast response-recovery dynamics upon contacting NO 2 gas and fresh air due to the highly open mesoporous structure and the large mesopores of the crystalline mesoporous In 2 O 3 .

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“…In 2 O 3 , as an important n-type semiconductor with a wide band gap of B3.6 eV, exhibits promising electronic and optical properties. [7][8][9] In particular, In 2 O 3 has been extensively applied in gas sensing, and the sensors based on In 2 O 3 exhibit good performance in NO x 10 detection, as well as in detecting toxic gases such as NH 3 , 11 O 3 12 and CO. 13 In recent years, In 2 O 3 nanostructures with various morphologies and sizes have been developed, such as nanotubes, 14 nanoflowers, 15 nanotowers 16 and so on. In 2 O 3 gas sensors with porous structure are particularly suitable for gas adsorption and diffusion, due to their large surface-to-volume ratio at the nanoscale level which allows quick diffusion of gas molecules, rendering them promising for the detection of low concentrations of target gases.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous In₂O₃ nanocrystals: synthesis, characterization and NO_x gas sensor at room temperature

Gao

Zhou

et al. 2016

New J. Chem.

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Synthesis of mesostructured indium oxide doped with rare earth metals for gas detection

Cited by 12 publications

References 20 publications

The Review of Semiconductor Gas Sensor for Nox Detcting

The Review of Semiconductor Gas Sensor for Nox Detcting

Amphiphilic Block Copolymer Templated Synthesis of Mesoporous Indium Oxides with Nanosheet-Assembled Pore Walls

Mesoporous In₂O₃ nanocrystals: synthesis, characterization and NO_x gas sensor at room temperature

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Synthesis of mesostructured indium oxide doped with rare earth metals for gas detection

Cited by 12 publications

References 20 publications

The Review of Semiconductor Gas Sensor for Nox Detcting

The Review of Semiconductor Gas Sensor for Nox Detcting

Amphiphilic Block Copolymer Templated Synthesis of Mesoporous Indium Oxides with Nanosheet-Assembled Pore Walls

Mesoporous In2O3 nanocrystals: synthesis, characterization and NOx gas sensor at room temperature

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Mesoporous In₂O₃ nanocrystals: synthesis, characterization and NO_x gas sensor at room temperature