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12 results on '"Tungsten oxide nanowires"'

1. Inkjet-printing assisted engineering of patternable zinc anode-based electrochromic devices.

Author

Sheng Qiu, Yanan Zhao, Kai Wang, Jinbin Luo, Rui Wang, Xinwei Jiang, Jingwei Chen, Elezzabi, Abdulhakem Y., Wu Zhang, Hao Jia, and Haizeng Li

Subjects
TUNGSTEN electrodes, OXIDE electrodes, ENERGY storage, OPTICAL modulation, TUNGSTEN oxides, ELECTROCHROMIC devices
Abstract

Zn anode-based electrochromic devices (ZECDs) stand out as a highly promising technology in the upcoming era of multifunctional electronic devices, offering a blend of electrochromic capabilities and energy storage functions within a single transparent platform. However, significant challenges persist in achieving efficient patterning, ensuring long-term stability, and fast color-switching kinetics for these devices. In this study, heterogeneous tungsten oxide nanowires (W17O47/Na0.1WO3, WNOs) are formulated into inkjet printing ink to assemble patternable ZECDs. The heterogeneous electrode structure of WNO enables a highly capacitive-controlled mechanism that promotes fast electrochromic/electrochemical behavior. Notably, by utilizing a three-dimensional MXene mesh modified substrate, the inkjet-printed ZECDs exhibit a wide optical modulation range of 69.13%, rapid color-changing kinetics (tc = 4.1 s, tb = 5.4 s), and highly reversible capacities of 70 mAh cm-2 over 1000 cycles. This scalable strategy develops the patterned electrodes with a wide optical modulation range and substantial energy storage properties, offering promising prospects for their application in next-generation smart electronics. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Ammonia Detection at Low Temperature by Tungsten Oxide Nanowires

Author

Sandrine Bernardini, Florent Pourcin, Nassirou Nambiema, Olivier Margeat, Khalifa Aguir, Christine Videlot-Ackermann, Jörg Ackermann, and Marc Bendahan

Subjects
ammonia, gas sensor, tungsten oxide nanowires, environmental monitoring, General Works
Abstract

Ammonia detection at low temperatures below 150 °C is attractive to be well suited for flexible substrates in terms of thermal strain and to specific environment not allowing high temperature such as explosive one. In commercial gas sensors, tungsten trioxide is the mostly used semiconducting metal oxide after tin dioxide. We report herein the efficiency of tungsten trioxide nanowires deposited on rigid substrate by drop coating from colloidal solution. This study provides an interesting approach to fabricate ammonia sensors on conformable substrate with significant properties for applications in environmental monitoring devices.

Published
2018
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3. CMOS Integrated Tungsten Oxide Nanowire Networks for ppb-level H2S Sensing.

Author

Krainer, J., Deluca, M., Lackner, E., Wimmer-Teubenbacher, R., Sosada, F., Gspan, C., Rohracher, K., Wachmann, E., and Koeck, A.

Subjects
COMPLEMENTARY metal oxide semiconductors, TUNGSTEN oxides, NANOWIRES, CHEMICAL detectors, STRUCTURAL plates
Abstract

Tungsten oxide is an intensively studied semiconductor with the relevant application as H 2 S gas sensor. In this work we report on H 2 S gas sensor devices based on tungsten oxide nanowire networks, which are integrated on a CMOS fabricated microhotplate chip. Tungsten oxide gas sensors were prepared by the deposition of nanowire networks onto interdigitated electrodes on CMOS. The material properties of the tungsten oxide nanowires were investigated by TEM and Raman spectroscopy, confirming their non-stoichiometric state. Utilising WO 3-x nanowire networks as gas sensing material we obtained extraordinary sensitivity to H 2 S: concentrations down to 10 ppb have been detected, even in the presence of 50% relative humidity. [ABSTRACT FROM AUTHOR]

Published
2016
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4. Synthesis of the cactus-like silicon nanowires/tungsten oxide nanowires composite for room-temperature NO2 gas sensor.

Author

Zhang, Weiyi, Hu, Ming, Liu, Xing, Wei, Yulong, Li, Na, and Qin, Yuxiang

Subjects
*SYNTHESIS of Nanocomposite materials, *SILICON nanowires synthesis, *TUNGSTEN oxides, *TEMPERATURE effect, *GAS detectors, *NITROGEN dioxide
Abstract

In the present work, the tungsten oxide (WO 3 ) nanowires functionalized silicon nanowires (SiNWs) with cactus-like structure has been successfully synthesized for room-temperature NO 2 detection. The novel nanocomposite was fabricated by metal-assisted chemical etching (MACE) and thermal annealing of tungsten film. The WO 3 nanowires were evenly distributed from the upper to the lower part of the SiNWs, indicating excellent uniformity which is conducive to adsorption and desorption of gas molecules. The gas-sensing properties have been examined by measuring the resistance change towards 0.25–5 ppm NO 2 gas. At room temperature, which is the optimum working temperature, the SiNWs/WO 3 nanowires composite showed two-times higher NO 2 response than that of the bare SiNWs at 2 ppm NO 2 . On the contrary, the responses of composite sensors to high concentrations of other reducing gases were very low, indicating excellent selectivity. Simultaneously, the composite sensors exhibited good sensing repeatability and stability. The enhancement in gas sensing properties may be attributed to the change in width of the space charge region, which is similar to the behavior of p-n junctions under forward bias, in the high-density p-n heterojunction structure formed between SiNWs and WO 3 nanowires. [ABSTRACT FROM AUTHOR]

Published
2016
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5. Ammonia Detection at Low Temperature by Tungsten Oxide Nanowires

Author

Olivier Margeat, Christine Videlot-Ackermann, Marc Bendahan, Sandrine Bernardini, Jörg Ackermann, Nassirou Nambiema, Florent Pourcin, Khalifa Aguir, Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)

Subjects
Materials science, Explosive material, Nanowire, Oxide, lcsh:A, 02 engineering and technology, Substrate (electronics), 01 natural sciences, ammonia, gas sensor, tungsten oxide nanowires, chemistry.chemical_compound, Ammonia, [SPI]Engineering Sciences [physics], 0202 electrical engineering, electronic engineering, information engineering, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, environmental monitoring, Tin dioxide, 010401 analytical chemistry, 020206 networking & telecommunications, Conformable matrix, Tungsten trioxide, 0104 chemical sciences, chemistry, Chemical engineering, 13. Climate action, [SDE]Environmental Sciences, lcsh:General Works
Abstract

International audience; Ammonia detection at low temperatures below 150 °C is attractive to be well suited for flexible substrates in terms of thermal strain and to specific environment not allowing high temperature such as explosive one. In commercial gas sensors, tungsten trioxide is the mostly used semiconducting metal oxide after tin dioxide. We report herein the efficiency of tungsten trioxide nanowires deposited on rigid substrate by drop coating from colloidal solution. This study provides an interesting approach to fabricate ammonia sensors on conformable substrate with significant properties for applications in environmental monitoring devices.

Published
2018
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6. Tungsten oxide nanowires grown on amorphous-like tungsten films

Author

Andrea Pezzoli, Matteo Passoni, Lucia Nasi, Valeria Russo, M. J Vahid, Alberto Tagliaferri, Silvia Maria Pietralunga, Claudia Conti, and David Dellasega

Subjects
Materials science, Annealing (metallurgy), Mechanical Engineering, Nanowire, Oxide, chemistry.chemical_element, Bioengineering, Nanotechnology, General Chemistry, Tungsten, tungsten oxide nanowires, law.invention, Pulsed laser deposition, Amorphous solid, chemistry.chemical_compound, Chemical engineering, chemistry, Mechanics of Materials, law, amorphous-like tungsten, General Materials Science, Electrical and Electronic Engineering, Crystallization, pulsed laser deposition, Stoichiometry
Abstract

Tungsten oxide nanowires have been synthesized by vacuum annealing in the range 500-710 °C from amorphous-like tungsten films, deposited on a Si(100) substrate by pulsed laser deposition (PLD) in the presence of a He background pressure. The oxygen required for the nanowires formation is already adsorbed in the W matrix before annealing, its amount depending on deposition parameters. Nanowire crystalline phase and stoichiometry depend on annealing temperature, ranging from W18O49-Magneli phase to monoclinic WO3. Sufficiently long annealing induces the formation of micrometer-long nanowires, up to 3.6 ?m with an aspect ratio up to 90. Oxide nanowire growth appears to be triggered by the crystallization of the underlying amorphous W film, promoting their synthesis at low temperatures.

Published
2015
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7. In-situ elektronová mikroskopie

Author

Kolíbal, Miroslav, Wandrol, Petr, Bukvišová, Kristýna, Kolíbal, Miroslav, Wandrol, Petr, and Bukvišová, Kristýna

Abstract

Cílem diplomové práce je popsat oxidaci nanotrubic sulfidu wolframičitého za zvýšených teplot v přítomnosti vodní páry. Na jejich povrchu se nejprve vytvoří nanočástice oxidu wolframu, ze kterých potom vyrůstají nanodráty. Na základě in-situ experimentů v rastrovacím elektronovém mikroskopu je navržen mechanismus reakce a ten je zjednodušeně popsán analyticky. Ukazuje se, že elektronový svazek má zásadní vliv na reakci., The aim of this thesis is to describe oxidation of tungsten disulfide nanotubes at elevated temperatures in water vapour. On their surface, tungsten oxide nanoparticles are formed from which nanowires can emerge. Based on in-situ experiments in a scanning electron microscope, a mechanism is proposed and described analytically. The electron beam is found to strongly enhance the reaction.

8. In-situ elektronová mikroskopie

Author

Kolíbal, Miroslav, Wandrol, Petr, Bukvišová, Kristýna, Kolíbal, Miroslav, Wandrol, Petr, and Bukvišová, Kristýna

Abstract

Cílem diplomové práce je popsat oxidaci nanotrubic sulfidu wolframičitého za zvýšených teplot v přítomnosti vodní páry. Na jejich povrchu se nejprve vytvoří nanočástice oxidu wolframu, ze kterých potom vyrůstají nanodráty. Na základě in-situ experimentů v rastrovacím elektronovém mikroskopu je navržen mechanismus reakce a ten je zjednodušeně popsán analyticky. Ukazuje se, že elektronový svazek má zásadní vliv na reakci., The aim of this thesis is to describe oxidation of tungsten disulfide nanotubes at elevated temperatures in water vapour. On their surface, tungsten oxide nanoparticles are formed from which nanowires can emerge. Based on in-situ experiments in a scanning electron microscope, a mechanism is proposed and described analytically. The electron beam is found to strongly enhance the reaction.

9. In-situ elektronová mikroskopie

Author

Kolíbal, Miroslav, Wandrol, Petr, Kolíbal, Miroslav, and Wandrol, Petr

Abstract

Cílem diplomové práce je popsat oxidaci nanotrubic sulfidu wolframičitého za zvýšených teplot v přítomnosti vodní páry. Na jejich povrchu se nejprve vytvoří nanočástice oxidu wolframu, ze kterých potom vyrůstají nanodráty. Na základě in-situ experimentů v rastrovacím elektronovém mikroskopu je navržen mechanismus reakce a ten je zjednodušeně popsán analyticky. Ukazuje se, že elektronový svazek má zásadní vliv na reakci., The aim of this thesis is to describe oxidation of tungsten disulfide nanotubes at elevated temperatures in water vapour. On their surface, tungsten oxide nanoparticles are formed from which nanowires can emerge. Based on in-situ experiments in a scanning electron microscope, a mechanism is proposed and described analytically. The electron beam is found to strongly enhance the reaction.

10. In-situ elektronová mikroskopie

Author

Kolíbal, Miroslav, Wandrol, Petr, Kolíbal, Miroslav, and Wandrol, Petr

Abstract

Cílem diplomové práce je popsat oxidaci nanotrubic sulfidu wolframičitého za zvýšených teplot v přítomnosti vodní páry. Na jejich povrchu se nejprve vytvoří nanočástice oxidu wolframu, ze kterých potom vyrůstají nanodráty. Na základě in-situ experimentů v rastrovacím elektronovém mikroskopu je navržen mechanismus reakce a ten je zjednodušeně popsán analyticky. Ukazuje se, že elektronový svazek má zásadní vliv na reakci., The aim of this thesis is to describe oxidation of tungsten disulfide nanotubes at elevated temperatures in water vapour. On their surface, tungsten oxide nanoparticles are formed from which nanowires can emerge. Based on in-situ experiments in a scanning electron microscope, a mechanism is proposed and described analytically. The electron beam is found to strongly enhance the reaction.

11. In-situ elektronová mikroskopie

Author

Kolíbal, Miroslav, Wandrol, Petr, Kolíbal, Miroslav, and Wandrol, Petr

Abstract

Cílem diplomové práce je popsat oxidaci nanotrubic sulfidu wolframičitého za zvýšených teplot v přítomnosti vodní páry. Na jejich povrchu se nejprve vytvoří nanočástice oxidu wolframu, ze kterých potom vyrůstají nanodráty. Na základě in-situ experimentů v rastrovacím elektronovém mikroskopu je navržen mechanismus reakce a ten je zjednodušeně popsán analyticky. Ukazuje se, že elektronový svazek má zásadní vliv na reakci., The aim of this thesis is to describe oxidation of tungsten disulfide nanotubes at elevated temperatures in water vapour. On their surface, tungsten oxide nanoparticles are formed from which nanowires can emerge. Based on in-situ experiments in a scanning electron microscope, a mechanism is proposed and described analytically. The electron beam is found to strongly enhance the reaction.

12. In-situ elektronová mikroskopie

Author

Kolíbal, Miroslav, Wandrol, Petr, Bukvišová, Kristýna, Kolíbal, Miroslav, Wandrol, Petr, and Bukvišová, Kristýna

Abstract

Cílem diplomové práce je popsat oxidaci nanotrubic sulfidu wolframičitého za zvýšených teplot v přítomnosti vodní páry. Na jejich povrchu se nejprve vytvoří nanočástice oxidu wolframu, ze kterých potom vyrůstají nanodráty. Na základě in-situ experimentů v rastrovacím elektronovém mikroskopu je navržen mechanismus reakce a ten je zjednodušeně popsán analyticky. Ukazuje se, že elektronový svazek má zásadní vliv na reakci., The aim of this thesis is to describe oxidation of tungsten disulfide nanotubes at elevated temperatures in water vapour. On their surface, tungsten oxide nanoparticles are formed from which nanowires can emerge. Based on in-situ experiments in a scanning electron microscope, a mechanism is proposed and described analytically. The electron beam is found to strongly enhance the reaction.

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