A Gas Sensor Based on a Single SnO Micro-Disk

Autor(es)

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

Afiliação do(s) autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: SENSORS; v. 18, n. 10 OCT 2018.
• Citações Web of Science: 4

Resumo

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)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 15/21033-0 - Comparação da resposta como sensor de gás de dispositivos com nanofita única e com múltiplas nanofitas de óxido de estanho
• Beneficiário: Mateus Gallucci Masteghin
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 17/26219-0 - Estudo de Sensores Químicos de Elemento Único a base de semicondutores de óxidos metálicos
• Beneficiário: Marcelo Ornaghi Orlandi
• Modalidade de apoio: Auxílio à Pesquisa - Regular