Tin Dioxide-Carbon Heterostructures Applied to Gas Sensing: Structure-Dependent Properties and General Sensing Mechanism
authors Marichy, C; Russo, PA; Latino, M; Tessonnier, JP; Willinger, MG; Donato, N; Neri, G; Pinna, N
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY C
keywords ATOMIC LAYER DEPOSITION; REDUCED GRAPHENE OXIDE; ROOM-TEMPERATURE; METAL-OXIDE; NO2 SENSORS; NANOTUBES; SNO2; NANOCRYSTALS; FILMS; NANOSTRUCTURES
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 (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 SnO2/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.
publisher AMER CHEMICAL SOC
issn 1932-7447
year published 2013
volume 117
issue 38
beginning page 19729
ending page 19739
digital object identifier (doi) 10.1021/jp406191x
web of science category Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000330162500054
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journal impact factor 4.484
5 year journal impact factor 4.691
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