Flexible highly sensitive hydrogen gas sensor based on a TiO2 thin film on polyimide foil

Krško, Ondrej; Pleceník, T.; Роч, Т.; Grančič, Branislav; Satrapinskyy, Leonid; Truchlý, Martin; Ďurina, Pavol; Gregor, M.; Kúš, P.; Plecenı́k, A.

doi:10.1016/j.snb.2016.09.036

Cited by 96 publications

(28 citation statements)

References 32 publications

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“…They have many advantages: high sensitivity, small size, fast response, and low cost in mass production. n-Type metal oxides are widely used as sensitive materials [1], for example, SnO 2 [2,3], ZnO [4,5,6], In 2 O 3 [7,8], WO 3 [9], TiO 2 [10] and so on. One of the main disadvantages of these materials is their high sensitivity to humidity, which makes it difficult to use them in real outdoor conditions.…”

Section: Introductionmentioning

confidence: 99%

Co3O4 as p-Type Material for CO Sensing in Humid Air

Vladimirova

Krivetskiy

Rumyantseva

et al. 2017

Sensors

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Nanocrystalline cobalt oxide Co3O4 has been prepared by precipitation and subsequent thermal decomposition of a carbonate precursor, and has been characterized in detail using XRD, transmission electron microscopy, and FTIR spectroscopy. The sensory characteristics of the material towards carbon monoxide in the concentration range 6.7–20 ppm have been examined in both dry and humid air. A sensor signal is achieved in dry air at sufficiently low temperatures T = 80–120 °C, but the increase in relative humidity results in the disappearance of sensor signal in this temperature range. At temperatures above 200 °C the inversion of the sensor signal in dry air was observed. In the temperature interval 180–200 °C the sensor signal toward CO is nearly the same at 0, 20 and 60% r.h. The obtained results are discussed in relation with the specific features of the adsorption of CO, oxygen, and water molecules on the surface of Co3O4. The independence of the sensor signal from the air humidity combined with a sufficiently short response time at a moderate operating temperature makes Co3O4 a very promising material for CO detection in conditions of variable humidity.

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Section: Introductionmentioning

confidence: 99%

Co3O4 as p-Type Material for CO Sensing in Humid Air

Vladimirova

Krivetskiy

Rumyantseva

et al. 2017

Sensors

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“…This approach improved the sensitivity to NO 2 gases by 300% compared to pure rGO thin film gas sensors fabricated in the same work. Metal-oxide gas sensors offer comparable performance with the resistive sensors described so far [507,520]. A TiO 2 gas sensor exhibited a sensitivity of 59,000% with H 2 gas concentration between 200 ppm and 10,000 ppm, a low detection limit of 3 ppm, but showed response time of several hours [520].…”

Section: Resistive Chemical Sensorsmentioning

confidence: 81%

Flexible Sensors—From Materials to Applications

et al. 2019

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Flexible sensors have the potential to be seamlessly applied to soft and irregularly shaped surfaces such as the human skin or textile fabrics. This benefits conformability dependant applications including smart tattoos, artificial skins and soft robotics. Consequently, materials and structures for innovative flexible sensors, as well as their integration into systems, continue to be in the spotlight of research. This review outlines the current state of flexible sensor technologies and the impact of material developments on this field. Special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.

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“…Titanium dioxide (TiO 2 ) has attracted considerable attention ever since the pioneer study by Fujishima and Honda in the 1970s . TiO 2 materials have wide‐ranged applications in photocatalysis, photoelectrochemical cells, rechargeable lithium ion batteries, sensors, and dye‐sensitized solar cells . All these applications are rooted in the distinctive physicochemical properties of these materials, which are mainly influenced by the specific facets of the TiO 2 crystals …”

Section: Fundamental Backgroundmentioning

confidence: 99%

Modulating High‐Index Facets on Anatase TiO₂

Zhou

Ding

et al. 2018

Eur J Inorg Chem

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The atomic arrangement of titanium and oxygen on crystalline anatase TiO 2 formulates various facets, dominating the TiO 2 surface chemistry. Due to its unique surface atomic structure, TiO 2 with high-index facets has received great interest from a wide spectrum of science. Insights gained from the intricate link between the morphological modulation of anatase TiO 2 with distinct high-index facets and the properties of these modifications can expedite the rational fabrication of functional Fundamental BackgroundTitanium dioxide (TiO 2 ) has attracted considerable attention ever since the pioneer study by Fujishima and Honda in the 1970s.[1] TiO 2 materials have wide-ranged applications in photocatalysis, photoelectrochemical cells, rechargeable lithium ion batteries, sensors, and dye-sensitized solar cells. [2][3][4][5][6][7][8][9] All these applications are rooted in the distinctive physicochemical properties of these materials, [10][11][12] which are mainly influenced by the specific facets of the TiO 2 crystals. [13][14][15][16][17][18][19][20] Recently, high-index TiO 2 has been reported to exhibit unique properties with an advantage over low-index TiO 2 . The high-index facets are defined as a series of Miller indices {hkl} with at least one index being greater than one. [21] Nano-or microcrystals with exposed high-index facets are of paramount significance to both fundamental research and technical applications by virtue of their copious atomic steps, kinks, ledges, dangling bonds, and abundant unsaturated coordination sites. [5,14,[22][23][24][25][26][27][28] For instance, we observed that high-index {201} TiO 2 exhibited better adsorption and photooxidation performance than that of three low-index {001}, {100}, and {101} TiO 2 materials. [13] This observation is ascribed to the surface energy, which follows the order {201} (1.72 J/m 2 ) > {001} (0.90 J/m 2 ) > {010} (0.53 J/m 2 ) > {101} (0.44 J/m 2 ). [13,[29][30][31] {201} facets have more uncoordinated Ti atoms, facilitating the photogeneration of hydroxyl radicals. The surface energy and atomic structure of [a] 688 comprised spindles with stepped terraces at 1 h. The TEM images at 6 h (Figure 7c, d) reveal that the particle size increased with extending reaction time. It is noteworthy that the SAED and HRTEM images (Figure 7e, f ) further confirm that the TiO 2 nanorods were composed of {010}, {001}, {101}, and {103} facets. An extraordinary power conversion efficiency was observed for DSSCs assembled of these unique microstructures.

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Flexible highly sensitive hydrogen gas sensor based on a TiO2 thin film on polyimide foil

Cited by 96 publications

References 32 publications

Co3O4 as p-Type Material for CO Sensing in Humid Air

Co3O4 as p-Type Material for CO Sensing in Humid Air

Flexible Sensors—From Materials to Applications

Modulating High‐Index Facets on Anatase TiO₂

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Flexible highly sensitive hydrogen gas sensor based on a TiO2 thin film on polyimide foil

Cited by 96 publications

References 32 publications

Co3O4 as p-Type Material for CO Sensing in Humid Air

Co3O4 as p-Type Material for CO Sensing in Humid Air

Flexible Sensors—From Materials to Applications

Modulating High‐Index Facets on Anatase TiO2

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Product

Resources

About

Modulating High‐Index Facets on Anatase TiO₂