Mesoporous WO3 Nanofibers With Crystalline Framework for High-Performance Acetone Sensing

Xu, Haiyun; Gao, Jie; Li, Minhan; Zhao, Yuye; Zhang, Ming; Zhao, Tao; Wang, Bijia; Jiang, Wan; Zhu, Guanjia; Qian, Xiaoyong; Fan, Yuchi; Yang, Jianping; Luo, Wei

doi:10.3389/fchem.2019.00266

Cited by 32 publications

(21 citation statements)

References 66 publications

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“…However, a distinctive polycrystalline surface morphology of the fiber with the diameter of individual fibers being in the range of 285-290 nm, which is composed of densely packed grains of 50-100 nm size, is observed for white WO 3−x NFs (Figure 2d). [17] During the preparation of a fully oxidized white WO 3 NFs, we carried out the high-temperature calcination under O 2 atmosphere. As demonstrated in Figure 2e,f, severe grain growth of thermally sintered particles occurred.…”

Section: Resultsmentioning

confidence: 99%

Black Tungsten Oxide Nanofiber as a Robust Support for Metal Catalysts: High Catalyst Loading for Electrochemical Oxygen Reduction

Kim

Yoon

Shin

et al. 2021

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Black valve metal oxides with low oxygen vacancies are identified to be promising for various industrial applications, such as in gas sensing, photocatalysis, and rechargeable batteries, owing to their high reducibility and stability, as well as considerable fractions of low‐valent metal species and oxygen vacancies in their lattices. Herein, the nanofiber (NF) of black oxygen‐deficient tungsten trioxide (WO3−x) is presented as a versatile and robust support for the direct growth of a platinum catalyst for oxygen reduction reaction (ORR). The nonstoichiometric, poorly crystallized black WO3−x NFs are prepared by electrospinning the W precursor into NFs followed by their low‐temperature (650 °C) reductive calcination. The black WO3−x NFs have adequate electrical conductivity owing to their decreased bandgap and amorphous structure. Remarkably, the oxygen‐deficient surface (surface O/W = 2.44) facilitates the growth of small Pt nanoparticles, which resist aggregation, as confirmed by structural characterization and computational analysis. The Pt‐loaded black WO3−x NFs outperform the Pt‐loaded crystalline white WO3−x NFs in both the electrochemical ORR activity and the accelerated durability test. This study can inspire the use of oxygen‐deficient metal oxides as supports for other electrocatalysts, and can further increase the versatility of oxygen‐deficient metal oxides.

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Section: Resultsmentioning

confidence: 99%

Black Tungsten Oxide Nanofiber as a Robust Support for Metal Catalysts: High Catalyst Loading for Electrochemical Oxygen Reduction

Kim

Yoon

Shin

et al. 2021

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“…The nanosheets synthesized for 6 h (NS-6) had the highest sheet area, leading to a 10 times higher response than those synthesized for 2 h and 24 h. They concluded that controlling the crystal facet of a nanomaterial can enhance the sensing characteristics without the requirement of noble metal decoration. Xu et al synthesized WO 3 nanofibers using SiO 2 nanoparticles and polyvinylpyrrolidone (PVP) as sacrificial templates, ammonium paratungstate as a tungsten precursor, and water as a solvent [ 96 ]. WO 3 nanofiber-based sensors were found to show magnificent acetone-sensing capabilities with a low detection limit, fast response and recovery, and high stability.…”

Section: Sensing Methodologies For Breath Analysismentioning

confidence: 99%

Exhaled Breath Analysis for Diabetes Diagnosis and Monitoring: Relevance, Challenges and Possibilities

et al. 2021

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With the global population prevalence of diabetes surpassing 463 million cases in 2019 and diabetes leading to millions of deaths each year, there is a critical need for feasible, rapid, and non-invasive methodologies for continuous blood glucose monitoring in contrast to the current procedures that are either invasive, complicated, or expensive. Breath analysis is a viable methodology for non-invasive diabetes management owing to its potential for multiple disease diagnoses, the nominal requirement of sample processing, and immense sample accessibility; however, the development of functional commercial sensors is challenging due to the low concentration of volatile organic compounds (VOCs) present in exhaled breath and the confounding factors influencing the exhaled breath profile. Given the complexity of the topic and the skyrocketing spread of diabetes, a multifarious review of exhaled breath analysis for diabetes monitoring is essential to track the technological progress in the field and comprehend the obstacles in developing a breath analysis-based diabetes management system. In this review, we consolidate the relevance of exhaled breath analysis through a critical assessment of current technologies and recent advancements in sensing methods to address the shortcomings associated with blood glucose monitoring. We provide a detailed assessment of the intricacies involved in the development of non-invasive diabetes monitoring devices. In addition, we spotlight the need to consider breath biomarker clusters as opposed to standalone biomarkers for the clinical applicability of exhaled breath monitoring. We present potential VOC clusters suitable for diabetes management and highlight the recent buildout of breath sensing methodologies, focusing on novel sensing materials and transduction mechanisms. Finally, we portray a multifaceted comparison of exhaled breath analysis for diabetes monitoring and highlight remaining challenges on the path to realizing breath analysis as a non-invasive healthcare approach.

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“…Luo et al found the sensitivity of porous WO 3 is 66 % higher than that of nonporous WO 3 and exhibit much faster response time. [77] The crystal facet engineering, elemental doping, and creating heterojunctions promote the reaction kinetics. [6a] The porous framework of WO 3 provides strong support to anchor metal nanoparticles.…”

Section: Sensingmentioning

confidence: 99%

Porous Tungsten Oxide: Recent Advances in Design, Synthesis, and Applications

Bentley

Desai

Bastakoti

2021

Chemistry A European J

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Tungsten oxide (WO 3 ) has received ever more attention and has been highly researched over the last decade due to its being a low-cost transition metal semiconductor with tunable, yet widely stable, band gaps. This minireview briefly highlights the challenges in the design and synthesis of porous WO 3 including methods, precursors, solvent effects, crystal phases, and surface activities of the porous WO 3 base material. These topics are explored while also drawing a connection of how the morphology and crystal phase affect the band gap. The shifts in band gap not only impact the optical properties of tungsten but also allow tuning to operate on different energy levels, which makes WO 3 highly desirable in many applications such as supercapacitors, batteries, solar cells, catalysts, sensors, smart windows, and bioapplications.

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Mesoporous WO3 Nanofibers With Crystalline Framework for High-Performance Acetone Sensing

Cited by 32 publications

References 66 publications

Black Tungsten Oxide Nanofiber as a Robust Support for Metal Catalysts: High Catalyst Loading for Electrochemical Oxygen Reduction

Black Tungsten Oxide Nanofiber as a Robust Support for Metal Catalysts: High Catalyst Loading for Electrochemical Oxygen Reduction

Exhaled Breath Analysis for Diabetes Diagnosis and Monitoring: Relevance, Challenges and Possibilities

Porous Tungsten Oxide: Recent Advances in Design, Synthesis, and Applications

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