Room temperature vanadium dioxide–carbon nanotube gas sensors made via continuous hydrothermal flow synthesis

Evans, G. P.; Powell, Michael; Johnson, I.; Howard, Dougal P.; Bauer, Dustin; Darr, Jawwad A.; Parkin, Ivan P.

doi:10.1016/j.snb.2017.07.152

Cited by 58 publications

(41 citation statements)

References 80 publications

(104 reference statements)

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“…1 Alongside the transition process, VO 2 shows a dramatic modification of conductivity on several orders of magnitude 2 and optical properties from infrared transparent to infrared opaque 3 with different external stimuli, including temperature, light, strain, electric field, and terahertz field. [2][3][4][5][6] Due to the unique phase transition, VO 2 has sparked numerous potential applications as field-effect transistors, 7 sensors, [8][9][10] metamaterials, [11][12][13] and thermochromic coatings. [14][15][16] Particularly, VO 2 based thermochromic coatings have been widely investigated due to their facile fabrication methods, simple structures, and automatic control of solar modulation for an energy-efficient effect depending on environmental temperatures without additional energy stimulus.…”

Section: Introductionmentioning

confidence: 99%

Mitigating Deterioration of Vanadium Dioxide Thermochromic Films by Interfacial Encapsulation

Chang

Cao

et al. 2019

Matter

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Long-term stability is a great challenge for commercializing VO 2 film, but corresponding research is lacking. This work demonstrated that the cross-section of VO 2 films is important to the corresponding deterioration process. An encapsulation structure is designed to protect VO 2 films from deterioration by utilizing stable and naturally hydrophobic HfO 2 layers. The proposed structure shows greatly extended service life, which could be equal to 16 years in the real environment. It provides a new strategy for stable VO 2 films in commercialization of applications.

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Section: Introductionmentioning

confidence: 99%

Mitigating Deterioration of Vanadium Dioxide Thermochromic Films by Interfacial Encapsulation

Chang

Cao

et al. 2019

Matter

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“…Moreover, Evans et al [589] produced humidity sensors based on VO2carbon nanotubes composites. These nanocomposites presented high response to water vapour, with sensitivity between 2.7 and 3.6, when increasing the RH to 50 %.…”

Section: Vanadium Oxidementioning

confidence: 99%

“…These nanocomposites presented high response to water vapour, with sensitivity between 2.7 and 3.6, when increasing the RH to 50 %. Devices resistance was reduced by incorporation of carbon nanotubes, CNTs, suggesting that these significantly contribute to the increased composites' conductivity [589] (Figure 25 (b)). nano/microwire can yield much higher sensitivity and responsivity than the bulk material.…”

Section: Vanadium Oxidementioning

confidence: 99%

See 1 more Smart Citation

Metal oxide nanostructures for sensor applications

Nunes

Pimentel

Gonçalves

et al. 2019

Semicond. Sci. Technol.

218

119

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Human health, environmental protection and safety are just a few examples of current humankind main concerns, that drive the scientific community to develop sensors able to precisely monitor and alert to possible harms in real time. Over the years, semiconductor metal oxide-based materials have been largely employed as sensors dedicated to several applications, being particularly interesting at the nanometer scale, since it is largely known that smaller crystallite size enhances sensor's performance. Moreover, these materials are highly appealing as they can be produced by low-cost wet-chemical synthesis routes and are in general nontoxic, earth abundant and low-cost. This manuscript extensively reviews the recent developments of nanostructured semiconductor metal oxide sensors ranging from gas to humidity sensors, including ultraviolet (UV) sensors and biosensors. Zinc oxide (ZnO), titanium dioxide (TiO2), tungsten trioxide (WO3), copper oxide (CuO and Cu2O), tin oxide (SnO and SnO2), and vanadium oxide (VO2, V2O5)-based sensors either as nanoparticles or as continuous films/layers are described. Their sensing properties are correlated to size, shape, presence of defects, doping elements, amongst other relevant parameters. Different techniques and methods of fabricating these materials are addressed. The review is concluded with novel approaches for functionalization and future perspectives for sensor developments.

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“…The employment of CNTs as secondary materials in hybrid composite, where a MO is deposited on CNTs, deliver an easy diffusion for chemical gas accessing through over the bulk material and introducing identical open gas nano-channels hence, the achievement of a great surface to volume ratio, and providing good gasadsorption sites due to inside and outside of MO-CNTs nanocomposites. [10,11]. Gas sensing materials based on MO-rGO/CNTs established significant consideration due to their excellent properties towards detection of a vast range of gases, being greater response and working at lower temperatures, related with other gas sensors [12].…”

Section: Introductionmentioning

confidence: 99%

CeO2 nano-hexagons decorated rGO/CNT heterostructure for high-performance LPG sensing

et al. 2020

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This paper reports, the improved sensitivity and selectivity of liquefied petroleum gas (LPG) sensing at room temperature based on ternary heterostructure nanocomposite (CeO 2-rGO/CNT). Detection of LPG is required for proper environment monitoring to avoid any health hazards in the household and industrial areas. Towards this, a low-cost, high performance, and high stable room temperature gas sensor was fabricated. CeO 2 nanopuzzles was synthesized by Eggshell membrane template assisted hydrothermal method and nanocomposites by sono-chemical route. As-synthesized materials and nanocomposites were analyzed by employing characterizations like XRD, Raman, FT-IR, FESEM, and TEM, which confirmed the formation of shape, size, structure, and functional groups involved. The current study focuses on the fabrication of room temperature LPG sensor based on hybrid nanocomposites coated on flexible polyethylene terephthalate substrate working electrodes for In-house chemiresistive LPG detection unit to study response, stability, and selectivity parameters. The ternary heterostructure nanocomposite gas sensor exhibited good selectivity to LPG at room temperature. This sensor showed the response of 42% at 400 ppm of LPG, which is 2.21 times than pure CeO 2 sensor with a short response time 26 s and recovery time of 98 s, and gained 99% response after bending with 95.2% stability and 85.7% periodic stability of the sensor.

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Room temperature vanadium dioxide–carbon nanotube gas sensors made via continuous hydrothermal flow synthesis

Cited by 58 publications

References 80 publications

Mitigating Deterioration of Vanadium Dioxide Thermochromic Films by Interfacial Encapsulation

Mitigating Deterioration of Vanadium Dioxide Thermochromic Films by Interfacial Encapsulation

Metal oxide nanostructures for sensor applications

CeO2 nano-hexagons decorated rGO/CNT heterostructure for high-performance LPG sensing

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