Fabrication and application of substoichiometric tungsten oxide with tunable localized surface plasmon resonances

Chen, Jun; Ren, Yumei; Hu, Tianzhao; Xu, Tao; Xu, Qun

doi:10.1016/j.apsusc.2018.09.140

Cited by 33 publications

(20 citation statements)

References 48 publications

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“…That is to say, the lattice of WO 3−x could sustain a considerable amount of oxygen vacancy and contain a number of W 5+ . Consequently, change of oxygen vacancies in WO 3−x could effectively tune the density of electron, and then have considerable conductivity [ 69 , 70 , 71 ]. WO 3 that strictly satisfy the stoichiometric ratio should be an insulator, and non-stoichiometric WO 3−x exhibits n-type semiconductor behavior.…”

Section: Electrical Propertiesmentioning

confidence: 99%

A Review on the Properties and Applications of WO3 Nanostructure−Based Optical and Electronic Devices

et al. 2021

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Tungsten oxide (WO3) is a wide band gap semiconductor with unintentionally n−doping performance, excellent conductivity, and high electron hall mobility, which is considered as a candidate material for application in optoelectronics. Several reviews on WO3 and its derivatives for various applications dealing with electrochemical, photoelectrochemical, hybrid photocatalysts, electrochemical energy storage, and gas sensors have appeared recently. Moreover, the nanostructured transition metal oxides have attracted considerable attention in the past decade because of their unique chemical, photochromic, and physical properties leading to numerous other potential applications. Owing to their distinctive photoluminescence (PL), electrochromic and electrical properties, WO3 nanostructure−based optical and electronic devices application have attracted a wide range of research interests. This review mainly focuses on the up−to−date progress in different advanced strategies from fundamental analysis to improve WO3 optoelectric, electrochromic, and photochromic properties in the development of tungsten oxide−based advanced devices for optical and electronic applications including photodetectors, light−emitting diodes (LED), PL properties, electrical properties, and optical information storage. This review on the prior findings of WO3−related optical and electrical devices, as well as concluding remarks and forecasts will help researchers to advance the field of optoelectric applications of nanostructured transition metal oxides.

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Section: Electrical Propertiesmentioning

confidence: 99%

A Review on the Properties and Applications of WO3 Nanostructure−Based Optical and Electronic Devices

et al. 2021

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“…It is found that the transmission power decreases upon the exposure of NO 2 gas. Surface‐adsorbed NO 2 gas molecules generally act as electron acceptors and attract Drude‐model‐like free electrons from the 2D WO x body to the solid–gas interface, which enhances the surface electron collective oscillation and therefore the strength of plasmon resonance6,12e (confirmed by the in situ UV–vis–NIR spectra shown in Figure c). The absorption of light that interacts with the 2D plasmonic WO x material is therefore increased, reducing the transmission of the fiber optics sensor.…”

Section: Resultsmentioning

confidence: 87%

“…However, the sensitivity is still limited if only bare optical fiber is used. Different functional materials have been used to integrate with the fiber optics platform to enhance the sensitivities toward gas molecules as gas–matter–light interaction is much stronger than that of light gas 2a,6. Typical materials include polymers,1a,7 metal oxides coated with metallic catalysts,1b,8 and more recently 2D materials (e.g., graphene, graphene oxide,2d,10 and transition metal dichalcogenide materials) …”

Section: Introductionmentioning

confidence: 99%

“…It is expected that Drude‐model‐like electrons are generated by oxygen vacancies in 2D WO x , which enter the bottom of conduction band. Plasmon resonance in the near‐infrared (NIR) telecommunication wavelengths is hence produced if the concentration of oxygen vacancies is small 6,12e. Therefore, the developed world‐first fiber optics gas sensor based on 2D NIR plasmonic WOx can be facilely integrated into the conventional telecommunication platforms for easy industry uptake.…”

Section: Introductionmentioning

confidence: 99%

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2D Plasmonic Tungsten Oxide Enabled Ultrasensitive Fiber Optics Gas Sensor

Yao

Ren

et al. 2019

Advanced Optical Materials

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Functional materials coated on optical fibers have demonstrated great potential for optical gas sensing applications. However, their sensitivity is typically limited to the sub‐parts per million (sub‐ppm) range. Here, for the first time a 2D near‐infrared plasmonic tungsten oxide (WOx) enabled ultrasensitive fiber optics gas sensor on a side‐polished D‐shape single mode optical fiber is presented. The plasmon resonance wavelength range of 2D WOx is matched with a conventional telecommunications wavelength of 1550 nm for driving the optical fiber, therefore inducing a strong light–matter interaction. Upon the surface adsorption of gas molecules, free electrons in the 2D WOx body are redistributed changing the plasmon resonance properties and hence the transmission through the optical fiber. The sensor is selectively responsive to NO2 at concentrations down to 44 parts per billion (ppb) with a limit of detection of 8 ppb at a relatively low elevated temperature. Such an excellent sensing performance is significantly improved over the previously reported fiber optics NO2 sensors, which suggests the integration of 2D plasmonic degenerated semiconductors as a viable approach to develop high‐performance fiber optics gas sensors.

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“…Several studies have shown the capability of plasmonic MOs in detecting bovine serum albumin (BSA), a popular protein for biosensing development. 31,144,197 BSA is a negatively charged protein and exhibits highly affinity to positively charged MO particles such as sub-stoichiometric WO x and MoO x . 156,197 After incubation with the nanocomposite, BSA can be immobilized onto the surface of nanoflakes via electrostatic interactions or collective van der Waals' forces.…”

Section: Colorimetric Bio-sensing Applicationsmentioning

confidence: 99%