WO<sub>3</sub> Nanoparticle-Based Conformable pH Sensor

Santos, Lídia; Neto, Joana P.; Crespo, Ana; Nunes, Daniela; Costa, Nuno; Fonseca, Isabel; Barquinha, Pedro; Pereira, L.; Silva, Jorge; Martins, Rodrigo; Fortunato, Elvira

doi:10.1021/am501724h

Cited by 155 publications

(103 citation statements)

References 41 publications

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“…Recently, a tungsten oxide conformable sensor based on coatings from WO 3 nanoparticles electrodeposited on flexible substrates was developed. The authors showed the possibility to achieve in such configuration a near‐Nernstian response of −56.7 ± 1.3 mV pH −1 a pH range of 5–9 …”

Section: Applicationsmentioning

confidence: 99%

Review on the Versatility of Tungsten Oxide Coatings

Mardare

Hassel

2019

Physica Status Solidi (a)

115

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Tungsten oxide is a versatile material with many advantages such as large availability and low fabrications costs. Additionally, it is suitable to be produced in the form of thin films or coatings, which makes it very attractive for many applications. In this Feature Article, the material properties such as crystallography, chemical stability, and semiconducting properties are presented, followed by examples of coating technologies. Furthermore, the relation between its structure and some of the very important applications fields such as electro‐ and photochromism, as well as pH sensing are analyzed in detail. Its auspicious semiconducting properties make it attractive to be used as photo(electro)catalyst, therefore applications of thin films based on WO3 are emphasized such as photoanodes for water splitting, in healthcare as antimicrobial material and for degradation of pollutants or for CO2 reduction. The article is concluded by a short overview of the current status of research employing tungsten oxide.

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Section: Applicationsmentioning

confidence: 99%

Review on the Versatility of Tungsten Oxide Coatings

Mardare

Hassel

2019

Physica Status Solidi (a)

115

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“…[ 21 ] On the other hand, inorganic semiconductors processed under optimized conditions (i.e., with proper deposition parameters and stoichiometry) can be quite stable over time, even without any encapsulation layer. Examples range from wearable biomedical devices [ 5 ] to active matrix backplanes of bendable and transparent organic light emission device (OLED) displays. [ 24,25 ] Nonetheless, it also fi nds applications in other fi elds of electronics and electrochemistry such as gas sensing in single electron transistors, [ 26 ] sensitive layer in ion-sensitive fi eld-effect transistors (ISFETs), [ 27 ] or even as high-κ dielectric in transparent FETs.…”

Section: Doi: 101002/aelm201500030mentioning

confidence: 99%

Flexible and Transparent WO₃ Transistor with Electrical and Optical Modulation

Barquinha

Pereira

et al. 2015

Adv Elect Materials

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“…[24][25][26][27][28][29][30] Concretely speaking, the pH sensing mechanism relies on the establishment of a surface equilibrium between the metal (M) and its oxide (MOx) when in contact with the test medium:…”

Section: Resultsmentioning

confidence: 99%

The Effects of Antimony Thin Film Thickness on Antimony pH Electrode Coated with Nafion Membrane

Zhang

Hou

et al. 2016

J. Electrochem. Soc.

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A new antimony pH electrode by employing magnetron sputtering Sb thin film on copper substrates inlaying in printed circuit board (PCB) was developed. To improve the performance of the electrode, nafion membrane was employed as an alternative modification layer. The layer was formed simply by drop casting 5 wt% nafion solutions and drying the resultant coating. Further, the effect of the thickness of the Sb sensing thin film on the performance of antimony pH electrodes was investigated. Surface morphology, energy spectrum, and electrochemical experiments were conducted in Sb thin film thickness of ∼50, ∼150, ∼240, and ∼330 nm. Experimental results demonstrated excellent features of the pH electrodes with ∼240 nm thickness Sb thin film, including high sensitivity, short response time, high resolution, stability, reversibility, and long-term stability. The pH electrode is low cost, high performance, and simple preparation, is promising to popularize in laboratory and industrial production.As a typical electrochemical sensor, pH sensor has been received much attention in various fields, such as food spoilage monitoring, water pollution monitoring, soil pollution monitoring, biomedical sensing, industrial and chemical processing and structural health monitoring, where pH measurements are vital for the characterization of aqueous solutions. 1 Currently the most widely used technique for determination of pH in laboratory is the glass pH electrode. While the performance of the glass electrodes is excellent in terms of high sensitivity, long-term stability, high ion selectivity and wide operating range, such electrodes have many disadvantages including mechanical fragile, need for wet storage, large size, limited shape, high impedance and high cost. 2,3 Drawbacks of glass electrodes have led to intensive research for alternative pH electrodes. Potentiometric metal/metal oxide electrodes have proven to be some of the most promising candidates. 4 Various metals and metal oxides, such as Ti/TiO 2 , Zr/ZrO 2 , W/WO 3 , Ir/IrO 2 , Sb/Sb 2 O 3 , Ru/RuO 2 , and Pd/PdO, have been investigated for pH electrodes due to important attractive features, such as insolubility, mechanical strength, electro catalyst, stability, and manufacturing technology. 1,5-8 Among them, Ir/IrO 2 , Ru/RuO 2 , and Sb/Sb 2 O 3 have been popular research points recently. Some relative studies have been conducted in last decade.For Ir/IrO 2 , many groups tried to fabricate the iridium oxide electrode with some different manufacturing methods, for example, a novel melt-oxidized method, a new carbonate melt oxidation method, the electrodeposited method, the sol-gel fabrication process, and so on. 4,6,[9][10][11] For Ru/RuO 2 , Maurya et al. designed a miniaturized pH sensor employing an R. F. sputtered RuO 2 thin-film electrode in conjunction with an electroplated Ag/AgCl reference electrode, and some factors, such as temperature effects, Ar/O 2 flow ratio, and electrode thickness, were studied. The ruthenium oxide thin-film electrodes were applied in engin...

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WO₃ Nanoparticle-Based Conformable pH Sensor

Cited by 155 publications

References 41 publications

Review on the Versatility of Tungsten Oxide Coatings

Review on the Versatility of Tungsten Oxide Coatings

Flexible and Transparent WO₃ Transistor with Electrical and Optical Modulation

The Effects of Antimony Thin Film Thickness on Antimony pH Electrode Coated with Nafion Membrane

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WO3 Nanoparticle-Based Conformable pH Sensor

Cited by 155 publications

References 41 publications

Review on the Versatility of Tungsten Oxide Coatings

Review on the Versatility of Tungsten Oxide Coatings

Flexible and Transparent WO3 Transistor with Electrical and Optical Modulation

The Effects of Antimony Thin Film Thickness on Antimony pH Electrode Coated with Nafion Membrane

Contact Info

Product

Resources

About

WO₃ Nanoparticle-Based Conformable pH Sensor

Flexible and Transparent WO₃ Transistor with Electrical and Optical Modulation