Room‐Temperature Hydrogen Sensing with Heteronanostructures Based on Reduced Graphene Oxide and Tin Oxide

Russo, Patrícia A.; Donato, Nicola; Leonardi, Salvatore Gianluca; Baek, Seunghwan; Conte, Donato E.; Neri, G.; Pinna, Nicola

doi:10.1002/anie.201204373

Cited by 267 publications

(141 citation statements)

References 48 publications

(2 reference statements)

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“…Therefore, many efforts are currently being made to develop sensors that can effectively detect NO 2 even at extremely low concentrations. 21 The comparison of original and published data on the sensing behavior of SnO 2 /CNT heterostructures, elaborated by ALD, with the previously reported results on RGO coated with tin dioxide by microwave-assisted solution route 10,11,14 provide insight into the role of the carbon−carbon and carbon−MO x / MO x −carbon junctions on the sensing mechanism. Furthermore, the results permit one to establish a general sensing mechanism of these MO x @carbon sensors.…”

Section: Introductionmentioning

confidence: 81%

“…We recently synthesized SnO 2 , FeO x , and TiO 2 on reduced graphene oxide (RGO) by a simple sol−gel approach combined with microwave irradiation. 11,14,15 Reduced graphene oxide is a chemically modified form of graphene, which can be produced more economically and on larger scale than pristine graphene. RGO exhibits good conductivity, typically on the order of 1− 100 S cm −1 , and high surface area and is a water-dispersible material useful for a wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Marichy¹,

Russo²,

Latino³

et al. 2013

J. Phys. Chem. C

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Carbon materials such as carbon nanotubes (CNTs), graphene, and reduced graphene oxide (RGO) exhibit unique electrical properties, which are also influenced by the surrounding atmosphere. They are therefore promising sensing materials. Despite the existence of studies reporting the gas-sensing properties of metal oxide (MOx) coated nanostructured carbon, an incomplete understanding of their sensing mechanism remains. Here we report a systematic study on the preparation, characterization, and sensing properties of CNT and RGO composites with SnO2 coating. Atomic layer deposition (ALD) was applied to the conformal coating of the inner and outer walls of CNTs with thin films of SnO2 of various thicknesses, while nonaqueous sol-gel chemistry assisted by microwave heating was used to deposit tin dioxide onto RGO in one step. The sensing properties of SnO2/CNTs and SnO 2/RGO heterostructures toward NO2 target gas were investigated as a function of the morphology and density of the metal oxide coating. The general sensing mechanism of carbon-based heterostructures and the role of the various junctions involved are established. ABSTRACT: Carbon materials such as carbon nanotubes (CNTs), graphene, and reduced graphene oxide (RGO) exhibit unique electrical properties, which are also influenced by the surrounding atmosphere. They are therefore promising sensing materials. Despite the existence of studies reporting the gas-sensing properties of metal oxide (MO x ) coated nanostructured carbon, an incomplete understanding of their sensing mechanism remains. Here we report a systematic study on the preparation, characterization, and sensing properties of CNT and RGO composites with SnO 2 coating. Atomic layer deposition (ALD) was applied to the conformal coating of the inner and outer walls of CNTs with thin films of SnO 2 of various thicknesses, while nonaqueous sol−gel chemistry assisted by microwave heating was used to deposit tin dioxide onto RGO in one step. The sensing properties of SnO 2 / CNTs and SnO 2 /RGO heterostructures toward NO 2 target gas were investigated as a function of the morphology and density of the metal oxide coating. The general sensing mechanism of carbon-based heterostructures and the role of the various junctions involved are established.

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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

Marichy¹,

Russo²,

Latino³

et al. 2013

J. Phys. Chem. C

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“…GO was prepared from graphite powder (, 20 mm, synthetic, Aldrich) by a modified Hummers method 37 previously reported. 34 Prior to the synthesis of the nanocomposites, the carbon black (1 g) was oxidized by refluxing in 5 M HNO 3 at 80 uC for 4 h and then thoroughly washed with water.…”

Section: Synthesis Of the Nanocompositesmentioning

confidence: 99%

“…TiO 2 /reduced graphene oxide (TiO 2 /RGO) and TiO 2 / carbon black (TiO 2 /CB) nanocomposites were synthesized by a microwave-assisted ''benzyl alcohol route'', a synthetic approach proven to be very versatile in terms of allowing the synthesis of a high variety of metal oxides, hybrid materials and composites, and also to lead to nanomaterials with improved performances in several applications. [29][30][31][32][33][34][35][36] The obtained materials were capable of converting xylose to furfural with yields of 67-69%, and were found to be hydrothermally stable and resistant against deactivation by coke formation, which allowed their reuse in consecutive catalytic runs, without the need of applying harsh thermal or chemical treatments.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted coating of carbon nanostructures with titanium dioxide for the catalytic dehydration of d-xylose into furfural

et al. 2013

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a Titanium dioxide was selectively grown on reduced graphene oxide (TiO 2 /RGO) and carbon black (TiO 2 / CB) by a microwave assisted synthesis in benzyl alcohol to produce nanocomposite catalysts (consisting of 8 9 nm anatase nanoparticles dispersed on the carbon surface) with interesting properties for the production of furfural from renewable carbohydrate biomass. The materials efficiently catalyze the aqueous phase dehydration of xylose into furfural at 170 uC with high furfural yields (67 69%) at high conversions (95 97%). The catalytic performance was not significantly affected by the type of carbon support, suggesting that cheap amorphous carbons can be used to support the titania nanoparticles.Additionally, the catalysts were found to be stable under hydrothermal conditions and outstandingly stable towards coke formation in comparison to other solid acid catalysts reported in the literature. Both composites were reused after a simple wash and drying procedure without any detectable loss of catalytic activity in consecutive batch runs.

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“…[16][17][18] Particularly, reduced graphene oxide (reduced graphene oxide) have been considered as a promising gas sensing material for detection of gases at room temperature. [19][20][21][22][23][24] Gu et al found that In 2 O 3 -graphene nanocomposite exhibited high sensitivity to NO 2 at room temperature. 25 Deng et al synthesized reduced graphene oxide conjugated Cu 2 O nanowire mesocrystals which exhibit excellent NO 2 sensing performance.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Cu/Cu₂O Nanoparticles–Graphene Composites for Efficient Detection of NO₂ at Room Temperature

Liu

Sun

2016

NANO

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Cu/Cu 2 O nanoparticles-reduced graphene oxide composites (CuGCs) have been successfully prepared by a facile solvothermal method. The combined characterizations indicate the successful formation of CuGCs. The $ 3 nm Cu/Cu 2 O nanoparticles homogeneously in situ grow on reduced graphene oxide sheets. CuGCs-based gas sensors were investigated for detection of NO 2 at room temperature. The CuGCs exhibited fast response behavior, relatively high response and could achieve a detection limit as low as 5 ppm. Furthermore, sensing mechanism and the reason for enhancing sensing performance have also been discussed.

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Room‐Temperature Hydrogen Sensing with Heteronanostructures Based on Reduced Graphene Oxide and Tin Oxide

Cited by 267 publications

References 48 publications

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

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

Microwave-assisted coating of carbon nanostructures with titanium dioxide for the catalytic dehydration of d-xylose into furfural

Facile Synthesis of Cu/Cu₂O Nanoparticles–Graphene Composites for Efficient Detection of NO₂ at Room Temperature

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Room‐Temperature Hydrogen Sensing with Heteronanostructures Based on Reduced Graphene Oxide and Tin Oxide

Cited by 267 publications

References 48 publications

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

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

Microwave-assisted coating of carbon nanostructures with titanium dioxide for the catalytic dehydration of d-xylose into furfural

Facile Synthesis of Cu/Cu2O Nanoparticles–Graphene Composites for Efficient Detection of NO2 at Room Temperature

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Facile Synthesis of Cu/Cu₂O Nanoparticles–Graphene Composites for Efficient Detection of NO₂ at Room Temperature