Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 140, Issue 1, Pages 319-336Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.04.026
Keywords
Hierarchical nanostructures; Hollow structures; Oxide semiconductor gas sensors; Gas response; Gas response kinetics
Funding
- Korean government (MEST) [R0A-2008-000-20032-0]
- National Research Foundation of Korea [과C6A2001, 2007-0055844] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Hierarchical and hollow oxide nanostructures are very promising gas sensor materials due to their high surface area and well-aligned nanoporous structures with a less agglomerated configurations. Various synthetic strategies to prepare such hierarchical and hollow structures for gas sensor applications are reviewed and the principle parameters and mechanisms to enhance the gas sensing characteristics are investigated. The literature data clearly show that hierarchical and hollow nanostructures increase both the gas response and response speed simultaneously and substantially. This can be explained by the rapid and effective gas diffusion toward the entire sensing surfaces via the porous structures. Finally, the impact of highly sensitive and fast responding gas sensors using hierarchical and hollow nanostructures on future research directions is discussed. (C) 2009 Elsevier B.V. All rights reserved.
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