A Gas Sensor Based on a Single SnO Micro-Disk

Author(s)

Masteghin, Mateus G. ^[1] ; Orlandi, Marcelo O. ^[1]

Affiliation

^[1] Sao Paulo State Univ, Dept Phys Chem, BR-14800900 Araraquara, SP - Brazil

• Document type: Journal article
• Source: SENSORS; v. 18, n. 10 OCT 2018.
• Web of Science Citations: 4

Abstract

In this study, individual nanofabricated SnO micro-disks, previously shown to exhibit exceptional sensitivity to NOx, are investigated to further our understanding of gas sensing mechanisms. The SnO disks presenting different areas and thickness were isolated and electrically connected to metallic electrodes aided by a Dual Beam Microscope (SEM/FIB). While single micro-disk devices were found to exhibit short response and recovery times and low power consumption, large interconnected arrays of micro-disks exhibit much higher sensitivity and selectivity. The source of these differences is discussed based on the gas/solid interaction and transport mechanisms, which showed that thickness plays a major role during the gas sensing of single-devices. The calculated Debye length of the SnO disk in presence of NO2 is reported for the first time. (AU)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 15/21033-0 - Comparison of the gas sensor response of devices with single and multiple tin oxide nanobelts
• Grantee: Mateus Gallucci Masteghin
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 17/26219-0 - Study of Single Element Chemical Sensor Devices based on Semiconducting Metal Oxide Materials
• Grantee: Marcelo Ornaghi Orlandi
• Support Opportunities: Regular Research Grants