GS1.2 - Nanoheterostructure Metal Oxide Gas Sensors: Opportunities and Challenges

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
Gas Sensors 1 - Fundamentals
S. Akbar, D. Miller, M. Al-Hashem, P. Karnati, J. Walker, P. Mottis - Department of Material Science and Engineering, The Ohio State University, Columbus (USA)
64 - 65


The use of nanoheterostructures as gas sensors has shown the potential to address issues such as gas selectivity or sensitivity in metal-oxide gas sensors although many outstanding challenges remain that inhibit a bottom-up approach to their design. As more complex heterostructures are used, the mechanisms governing their behavior become more ambiguous requiring precise material and electrical characterization techniques to be used. High spatial resolution microscopy has demonstrated the ability to characterize the band structure and defect states in SnO2 nanomaterials revealing the complex nature of mid-gap defect states present. Impedance spectroscopy on single and multi-nanowire SnO2 gas sensors has demonstrated an ability to discriminate between different contributions to sensor response and reveal the underlying mechanisms involved. These techniques are expected to help address outstanding questions to explain the role that defects and heterostructure types have in the sensing process and deconvolute the complex relationships involved to uncover the underlying mechanisms. Additionally, an Open access Database Of Resistive type gas Sensors (ODORS) that is under development is expected to greatly enhance productivity in the field by enabling more informed research studies and presenting new perspectives.