Exposed crystal facets of WO3 nanosheets by phase control on NO2-sensing performance

Song, Wanqing; Zhang, Rui; Bai, Xue; Jia, Qi; Ji, Huiming

doi:10.1007/s10854-019-02565-6

Cited by 61 publications

(21 citation statements)

References 40 publications

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“…Beknalkar et al [ 47 ] prepared 3D monoclinic WO 3 nanoflowers and obtained a response larger than 50 to 100 ppm NO 2 at 100 °C. Interestingly, Song et al [ 48 ] observed that triclinic WO 3 nanosheets prepared via the hydrothermal method displayed a larger response to NO 2 than monoclinic and hexagonal WO 3 . They reported a response of 18.8 to 300 ppb of NO 2 at 100 °C.…”

Section: Sensing Capabilities Of Womentioning

confidence: 99%

Mechanistic Insights into WO3 Sensing and Related Perspectives

Epifani

2022

Sensors

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Tungsten trioxide (WO3) is taking on an increasing level of importance as an active material for chemoresistive sensors. However, many different issues have to be considered when trying to understand the sensing properties of WO3 in order to rationally design sensing devices. In this review, several key points are critically summarized. After a quick review of the sensing results, showing the most timely trends, the complex system of crystallographic WO3 phase transitions is considered, with reference to the phases possibly involved in gas sensing. Appropriate attention is given to related investigations of first principles, since they have been shown to be a solid support for understanding the physical properties of crucially important systems. Then, the surface properties of WO3 are considered from both an experimental and first principles point of view, with reference to the paramount importance of oxygen vacancies. Finally, the few investigations of the sensing mechanisms of WO3 are discussed, showing a promising convergence between the proposed hypotheses and several experimental and theoretical studies presented in the previous sections.

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Section: Sensing Capabilities Of Womentioning

confidence: 99%

Mechanistic Insights into WO3 Sensing and Related Perspectives

Epifani

2022

Sensors

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“…Various synthetic methods of fabricating nano-sized monoclinic WO 3 (m-WO 3 ) particles have recently been reported ( Cortés-Jácome et al, 2005;Pan et al, 2006;Kanan and Tripp, 2007;Shang et al, 2020;Sirotkin et al, 2020;Song et al, 2020). The most common method of preparing nanoparticles of tungsten oxide is sol-gel synthesis, in which a tungstic acid (H 2 WO 4 ) precursor is obtained by passing Wbearing materials (e.g., Na 2 WO 4 or CaWO 4 ) through an ion-exchange resin.…”

Section: Genesis Of Liguowuitementioning

confidence: 99%

Liguowuite, WO<sub>3</sub>, a new member of the <i>A</i>-site vacant perovskite type minerals from the Panzhihua–Xichang region, China

Xue

Sun

et al. 2022

Eur. J. Mineral.

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Abstract. A new member of the non-stoichiometric perovskite group mineral species, liguowuite, ideally WO3, has been found in the Neoproterozoic Sinian biotite-quartz monzonite in the southern part of the Panzhihua–Xichang region (Nanyang village: 26∘46′8.21′′ N, 101∘27′13.86′′ E), China. It is associated with hornblende, pargasite, ferro-hornblende, annite, hydrobiotite, phlogopite, orthoclase, microcline, albite, quartz, kaolinite, ilmenite, goethite, hematite, magnetite, pyrite, zircon, zoisite, titanite, epidote, diopside, tourmaline, almandine, fluorapatite, monazite-(Ce), allanite-(Ce), bastnäsite-(Ce), xenotime-(Y), scheelite, moissanite, tellurite, wumuite, and tewite. Liguowuite occurs as greenish yellow prisms, ranging from 0.05 to 0.1 mm in diameter, and it is transparent with a greasy luster and a white streak. Liguowuite exhibits a triclinic pseudomorphism composed of nanoparticles with many cracks and nanovoids. This mineral is brittle and has a Mohs hardness value of approximately 3–4. The calculated density is 7.22 g cm−3. Electron microprobe analyses gave (average weight percent, wt %, of 15 spot analyses of 4 samples) K2O = 0.01, WO3 = 99.23, TeO2 = 0.03, CaO = 0.06, Na2O = 0.04, and total 99.37, yielding the empirical formula W1.00O3, based on Oapfu=3 and ideally WO3. The strongest five diffraction lines (d Å (I)(hkl)) are 3.8552 (88)(002), 3.7685 (88)(020), 3.6590 (100)(–200), 2.6928 (43)(022), and 2.6258 (60)(202). Liguowuite is monoclinic and is in space group P21/n, with a= 7.32582(18) Å, b= 7.54767(18) Å, c= 7.71128(18) Å, β= 90.678(3)∘, V= 426.348(19) Å3, and Z= 8. The crystal structure data were refined using the Rietveld refinement method and X-ray powder diffraction data. The reliability factors (R factors) were Rwp= 0.0604 and Rp= 0.0454, with χ2 = 1.707. Liguowuite consists of corner-sharing distorted and tilted [WO6] octahedra, in which the W atoms are off-center and form six W–O bonds ranging from 1.7 to 2.2 Å with the surrounding oxygen atoms. According to the hierarchical scheme for perovskite supergroup minerals, liguowuite is the first reported example of A-site vacant single oxide, i.e., a new perovskite subgroup.

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“…Além disso, observou-se também nas amostras de WO 3 -SBA-15 o aparecimento de sinais relacionados a fase do WO 3 , a medida em que se aumentou a quantidade de tungstênio na razão molar Si/W. Em relação ao padrão de DRX da amostra de WO 3 puro, pode-se identificar sinais que são relacionados a uma mistura de fases do WO 3 , isto é, monoclínica, triclínica e hexagonal (SONG et al, 2020).…”

Section: Difração De Raios-x (Drx)unclassified

Introdução a Química Dos Compostos Por Coordenação

Gomes¹,

Lopes²

2022

https://atenaeditora.com.br/catalogo/ebook/quimica-desvendando-propriedades-e-comportamentos-da-materia-2

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Direitos para esta edição cedidos à Atena Editora pelos autores. Open access publication by Atena Editora Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição-Não-Comercial-NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação com base em critérios de neutralidade e imparcialidade acadêmica.A Atena Editora é comprometida em garantir a integridade editorial em todas as etapas do processo de publicação, evitando plágio, dados ou resultados fraudulentos e impedindo que interesses financeiros comprometam os padrões éticos da publicação. Situações suspeitas de má conduta científica serão investigadas sob o mais alto padrão de rigor acadêmico e ético.

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Exposed crystal facets of WO3 nanosheets by phase control on NO2-sensing performance

Cited by 61 publications

References 40 publications

Mechanistic Insights into WO3 Sensing and Related Perspectives

Mechanistic Insights into WO3 Sensing and Related Perspectives

Liguowuite, WO<sub>3</sub>, a new member of the <i>A</i>-site vacant perovskite type minerals from the Panzhihua–Xichang region, China

Introdução a Química Dos Compostos Por Coordenação

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Exposed crystal facets of WO3 nanosheets by phase control on NO2-sensing performance

Cited by 61 publications

References 40 publications

Mechanistic Insights into WO3 Sensing and Related Perspectives

Mechanistic Insights into WO3 Sensing and Related Perspectives

Liguowuite, WO&lt;sub&gt;3&lt;/sub&gt;, a new member of the &lt;i&gt;A&lt;/i&gt;-site vacant perovskite type minerals from the Panzhihua–Xichang region, China

Introdução a Química Dos Compostos Por Coordenação

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Product

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Liguowuite, WO<sub>3</sub>, a new member of the <i>A</i>-site vacant perovskite type minerals from the Panzhihua–Xichang region, China