Tin dioxide-carbon heterostructures applied to gas sensing: Structure-dependent properties and general sensing mechanism

Catherine Marichy, Patricia A. Russo, Mariangela Latino, Jean Philippe Tessonnier, Marc Georg Willinger, Nicola Donato, Giovanni Neri, Nicola Pinna

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

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 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.

Original languageEnglish
Pages (from-to)19729-19739
Number of pages11
JournalJournal of Physical Chemistry C
Volume117
Issue number38
DOIs
StatePublished - 26 Sep 2013
Externally publishedYes

Fingerprint

Dive into the research topics of 'Tin dioxide-carbon heterostructures applied to gas sensing: Structure-dependent properties and general sensing mechanism'. Together they form a unique fingerprint.

Cite this