Hexagonal phase WO3 nanorods: Hydrothermal preparation, formation mechanism and its photocatalytic O2 production under visible-light irradiation

Peng, Tianyou; Ke, Deping; Xiao, Jiangrong; Wang, Li; Hu, Jun; Zan, Ling

doi:10.1016/j.jssc.2012.05.016

Cited by 77 publications

(48 citation statements)

References 26 publications

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“…This peak was deconvoluted into two peaks centred at 775 cm -1 and 816 cm -1 . ElBatal [25] observed Raman shifts at 333 cm [31][32][33][34][35]. Analysing spot 1, the peaks at 110 cm -1 and 152 cm -1 suggest a WO 3 hydrate [22].…”

Section: Resultsmentioning

confidence: 99%

Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis

Govender

Mwakikunga

Machatine

et al. 2014

Phys. Status Solidi C

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Laser pyrolysis is a synthesis method used to produce thin films and nanomaterials of high quality and purity, by intersecting a laser beam with a chemical precursor. We have chosen laser pyrolysis to synthesize tungsten trioxide starting with tungsten ethoxide precursor. The film had a thickness that varied from 205 nm to 1 µm. Xray diffraction and Raman spectroscopy confirmed the presence of a mixture of hexagonal and tetragonal phase WO 3 in the synthesized film, and it was clear that annealing greatly influenced the phases and types of structures formed. I-V curves of the films showed n-type semiconducting behaviour, but the mixed phase appeared to cause a similar behaviour of dopants in a semiconductor. The refractive index decreased with increasing wavelength and gave values of up to 21 at low wavelengths. The average optical band gap was found to 3.6 eV from UV/Vis spectroscopy. Scanning Electron Microscopy (SEM) showed a mixture of nano-and microstructures and shapes formed after annealing. One of the grown nanostructures was nanorods, this isolated using FIB for possible applications such as an active sensing medium in gas sensors.

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Section: Resultsmentioning

confidence: 99%

Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis

Govender

Mwakikunga

Machatine

et al. 2014

Phys. Status Solidi C

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“…Furthermore, the tungsten oxide-based materials appear some different crystal structures including tungsten bronze-type hexagonal, pyrochlore-type cubic and so on, which suggests a potential in constructing homojunction photocatalysts. In the previous studies, both tungsten bronze-type hexagonal phase and pyrochlore-type cubic phase have received attentions for application to photocatalyst and show a high activity for degrading pollution and splitting water [22][23][24]. It should be emphasized that the realization of efficient homojunction demands the energy structure match between two different phases, which has been used as the standard to constitute homojunction from a series of existing phases.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of hexagonal/cubic tungsten oxide homojunction with improved photocatalytic activity

Kong

Sun

Zhao

et al. 2015

Applied Catalysis A: General

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“…To achieve WO 3 with different morphologies, there are some parameters for each methods. For example in the hydrothermal method, the reaction temperature (R. Huang, Shen, Zhao, & Yan, 2012), PH value (Zheng et al, 2013 and reaction time (Hassani, Marzbanrad, Zamani, & Raissi, 2011;Peng et al, 2012) can be changed to regulate the reaction. According to dimensionality the tungsten oxide divided to five classification which would be presented in the following parts.…”

Section: Synthesis Of Womentioning

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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Hexagonal phase WO3 nanorods: Hydrothermal preparation, formation mechanism and its photocatalytic O2 production under visible-light irradiation

Cited by 77 publications

References 26 publications

Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis

Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis

Fabrication of hexagonal/cubic tungsten oxide homojunction with improved photocatalytic activity

The Review of Semiconductor Gas Sensor for Nox Detcting

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