Tin Dioxide–Carbon Heterostructures Applied to Gas Sensing: Structure-Dependent Properties and General Sensing Mechanism

Marichy, Catherine; Russo, Patrícia A.; Latino, M.; Tessonnier, Jean‐Philippe; Willinger, Marc Georg; Donato, Nicola; Neri, G.; Pinna, Nicola

doi:10.1021/jp406191x

Cited by 30 publications

(48 citation statements)

References 56 publications

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“…However, due to the low TiO 2 thickness, tunneling effect can overcome this limitation reducing the height of the potential barrier for the conduction at crossing points, whereas CNT cores provide a privileged conduction path. Similar behavior was already observed for sensing layer made of SnO 2 -coated carbon nanotubes [9,15]. The resistance of the hetero-structures is dependent of the oxide thickness, with a maximum for 5.5 nm TiO 2 ( Figure 2b).…”

Section: Resultssupporting

confidence: 82%

“…The effective deposited thickness was determined by TEM imaging. Electrical properties and sensing behavior on devices made of pure CNTs were already described elsewhere [15]. Electrical measurements performed on TiO 2 sensing materials served as reference and baseline for the gas sensing tests.…”

Section: Resultsmentioning

confidence: 99%

“…Carbon nanotubes (CNTs) appear as an ideal support for such applications due to their intrinsic electrical properties, which can be influenced by the surrounding atmosphere. CNTs have been already employed as support for various metal oxide sensing layer [8][9][10][11][12][13][14] and a recent paper described a general sensing mechanism for SnO 2 -carbon heterostructures [15].…”

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confidence: 99%

“…Because a switch between the two material typology involves a change of dominating surface species and surface chemical reactions determining the sensing mechanism, this study could give new insight about the general understanding of sensing mechanism on p-type hybrid semiconducting materials. Based on the previous sensing mechanism established for SnO 2 -carbon structures [15], an attempt is made to explain this behavior.…”

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confidence: 99%

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Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

et al. 2014

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Abstract:Amorphous titanium dioxide-coated carbon nanotubes were prepared by atomic layer deposition and investigated as sensing layers for resistive NO2 and O2 gas sensors. By varying ALD process conditions and CNT structure, heterostructures with different metal oxide grain size, morphology and coating thickness were synthesized. Higher responses were observed with homogeneous and continuous 5.5 nm thick films onto CNTs at an operating temperature of 150 °C, while CNTs decorated with either discontinuous film or TiO2 nanoparticles showed a weak response close to the one of device made of bare CNTs. An unexpected p-type behavior in presence of the target gas was also noticed, independently of the metal oxide morphology and thickness. Based on previous works, hypotheses were made in order to explain the p-type behavior of TiO2/CNT sensors. CONFIDENTIAL -FOR REVIEW ONLY NANO-104240.R2Gas sensing properties and p-type response of ALD TiO 2 coated carbon nanotubes Email: catherine.marichy@univ-lyon1.fr AbstractAmorphous titanium dioxide-coated carbon nanotubes were prepared by atomic layer deposition and investigated as sensing layers for resistive NO 2 and O 2 gas sensors. By varying ALD process conditions and CNT structure, heterostructures with different metal oxide grain size, morphology and coating thickness were synthesized. Higher responses were observed with homogeneous and continuous 5.5 nm thick films onto CNTs at an operating temperature of 150 °C, while CNTs decorated with either discontinuous film or TiO 2 nanoparticles showed a weak response close to the one of device made of bare CNTs. An unexpected p-type behavior in presence of the target gas was also noticed, independently of the metal oxide morphology and thickness. Based on previous works, hypotheses were made in order to explain the p-type behavior of TiO 2 /CNT sensors.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

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“…Schematic illustration of the junctions involved in the sensing mechanism of metal oxide/CNTs. Adapted with permission from [68].…”

Section: Working Mechanismmentioning

confidence: 99%

First Fifty Years of Chemoresistive Gas Sensors

2015

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Abstract:The first fifty years of chemoresistive sensors for gas detection are here reviewed, focusing on the main scientific and technological innovations that have occurred in the field over the course of these years. A look at advances made in fundamental and applied research and leading to the development of actual high performance chemoresistive devices is presented. The approaches devoted to the synthesis of novel semiconducting materials with unprecedented nanostructure and gas-sensing properties have been also presented. Perspectives on new technologies and future applications of chemoresistive gas sensors have also been highlighted.

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Nanostructured Materials for Room‐Temperature Gas Sensors

et al. 2015

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Sensor technology has an important effect on many aspects in our society, and has gained much progress, propelled by the development of nanoscience and nanotechnology. Current research efforts are directed toward developing high-performance gas sensors with low operating temperature at low fabrication costs. A gas sensor working at room temperature is very appealing as it provides very low power consumption and does not require a heater for high-temperature operation, and hence simplifies the fabrication of sensor devices and reduces the operating cost. Nanostructured materials are at the core of the development of any room-temperature sensing platform. The most important advances with regard to fundamental research, sensing mechanisms, and application of nanostructured materials for room-temperature conductometric sensor devices are reviewed here. Particular emphasis is given to the relation between the nanostructure and sensor properties in an attempt to address structure-property correlations. Finally, some future research perspectives and new challenges that the field of room-temperature sensors will have to address are also discussed.

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Tin Dioxide–Carbon Heterostructures Applied to Gas Sensing: Structure-Dependent Properties and General Sensing Mechanism

Cited by 30 publications

References 56 publications

Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

First Fifty Years of Chemoresistive Gas Sensors

Nanostructured Materials for Room‐Temperature Gas Sensors

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Tin Dioxide–Carbon Heterostructures Applied to Gas Sensing: Structure-Dependent Properties and General Sensing Mechanism

Cited by 30 publications

References 56 publications

Gas sensing properties and p-type response of ALD TiO2coated carbon nanotubes

Gas sensing properties and p-type response of ALD TiO2coated carbon nanotubes

First Fifty Years of Chemoresistive Gas Sensors

Nanostructured Materials for Room‐Temperature Gas Sensors

Contact Info

Product

Resources

About

Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes