Characterization and application of a new pH sensor based on magnetron sputtered porous WO3 thin films deposited at oblique angles

Salazar, Pedro; García‐García, Francisco J.; Yubero, F.; Gil-Rostra, Jorge; González‐Elipe, Agustín R.

doi:10.1016/j.electacta.2016.02.040

Cited by 43 publications

(38 citation statements)

References 37 publications

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“…This type of sensor showed good stability in a pH range from 2 to 12, as well as selectivity and fast response time . More recent research showed the possibility of using sputter deposited columnar nanoporous WO 3 for fabrication of a full solid‐state pH sensor based on commercial screen printed electrodes which showed good stability and Nernstian behavior in a pH range from 1 to 12 . Development of flexible pH sensors for specific applications has recently become of great importance .…”

Section: Applicationsmentioning

confidence: 99%

Review on the Versatility of Tungsten Oxide Coatings

Mardare

Hassel

2019

Physica Status Solidi (a)

108

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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)

108

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“…Eventually, some of the columns stop growing and the other ones only grow on the top [45][46][47][48]. The formed columns are titled toward the incident flux direction and can be sculptured into different morphologies, such as helices, inclined and vertical pillars (with variable diameter), zig-zags, and square spirals [49][50][51][52][53]. All these efforts make the GLAD technique excellent for design and device optimization for the development of sensors and optical devices, among others [45,[54][55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Antifungal activity of ZnO thin films prepared by glancing angle deposition

et al. 2019

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Highlights• Zinc Oxide thin films were deposited by reactive magnetron sputtering;• Inclined columns changed the thin films' surface porosity;• Sputtering incidence angle affects microstructure and antifungal properties;• Mesoporous thin films improved the antifungal properties against Candida albicans; ABSTRACTThin films of zinc oxide (ZnO) were produced by reactive DC magnetron sputtering with sputtering angles of α = 0º, 40º, 60º and 80º (glancing angle deposition configuration), aiming to be tested against the opportunist pathogenic fungus Candida albicans. The results showed the formation of stoichiometric ZnO thin films, with inclined columns for incidence angles equal to or more than 40º. All thin films presented high transparency in the visible range above the bandgap region (near 380 nm). The deposition conditions gave rise to a three-fold increase of the surface porosity with the increment of the incidence angle. Noteworthy, is the formation of different types of pores distributions, from micro-, through meso-, to macropores. Regarding the biological effect, the thin films produced with inclined columns presented a significant antifungal activity, with the inhibition of viable cell growth by 68 %. Moreover, the formation of mesoporous films enhanced the antifungal properties of ZnO thin films against Candida albicans. The overall behaviour indicates that these thin films are promising candidates to be applied in antimicrobial surfaces, as well as to be used in further studies to determine the molecular mechanisms involved in the antimicrobial action of ZnO.3

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“…This combination ensures the correct immobilization of the biological recognition element (cholesterol oxidase) and preserves its electrocatalytic activity. Magnetron Sputtering (MS) has been selected to fabricate the Pt electrode [14]. This physical vapour deposition technique is typically used for the fabrication of compact films, a feature that restricts the expected functionality with regard to biomolecules.…”

Section: Introductionmentioning

confidence: 99%

“…This physical vapour deposition technique is typically used for the fabrication of compact films, a feature that restricts the expected functionality with regard to biomolecules. An alternative to conventional MS consists of using an oblique angle deposition configuration (MS-OAD) where the substrate is placed at an oblique angle with respect to the target [14][15][16][17][18][19][20][21][22]. This deposition geometry leads to the formation columnar and highly porous microstructure with mesopores extending from the surface of the film up to the interface with the substrate [18,21].…”

Section: Introductionmentioning

confidence: 99%

Cholesterol biosensing with a polydopamine-modified nanostructured platinum electrode prepared by oblique angle physical vacuum deposition

Martín

Salazar

Álvarez

et al. 2017

Sensors and Actuators B: Chemical

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This paper reports a novel cholesterol biosensor based on nanostructured platinum (Pt) thin films prepared by Magnetron Sputtering (MS) in an oblique angle (OAD) configuration. Pt thin films were deposited onto a gold screen-printed electrode and characterized using Rutherford Back Scattering (RBS), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Cyclic Voltammetry (CV), X-ray Photo-electron Spectroscopy (XPS), Atomic Force Microscopy (AFM) and wetting analysis. Our results confirmed that the film is highly porous and formed by tilted nanocolumns, with an inclination of around 40º and a total thickness of 280 nm. XRD and CV analysis confirmed the polycrystalline nature of the Pt thin film. Cholesterol oxidase (ChOx) was covalently immobilized using a bioinspired polymer, polydopamine (PDA), via Schiff base formation and Michael-type addition. After being immobilized, ChOx displayed an apparent activation energy of 34.09 kJ mol-1 and a Michaelis constant (K M) equal to 3.65 mM, confirming the high affinity between ChOx and cholesterol and the excellent ability of the PDA film for immobilizing biological material without degradation. Under optimized working conditions our biosensor presented a sensitivity of 14.3 mA M −1 cm −2 (R 2 :0.999) with a linear range up to 0.5 mM and a limit of detection of 10.5 µM (S/N = 3). Furthermore the biosensor exhibits a fast response (< 8 s), good anti-interference properties and high stability after relatively long-term storage (2 months).

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Characterization and application of a new pH sensor based on magnetron sputtered porous WO3 thin films deposited at oblique angles

Cited by 43 publications

References 37 publications

Review on the Versatility of Tungsten Oxide Coatings

Review on the Versatility of Tungsten Oxide Coatings

Antifungal activity of ZnO thin films prepared by glancing angle deposition

Cholesterol biosensing with a polydopamine-modified nanostructured platinum electrode prepared by oblique angle physical vacuum deposition

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