A label-free Acetone based SnO2 nanowire network sensor at room temperature

Autor(es)

de Araujo, Estacio P. ; Amorim, Cleber A. ; Arantes, Adryelle N. ; Chiquito, Adenilson J.

• Tipo de documento: Artigo Científico
• Fonte: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING; v. 128, n. 5, p. 8-pg., 2022-05-01.

Resumo

Acetone is a toxic gas employed in several pharmaceutical and commercial preparations, circumstances that demand efficient exposure control methods. Quasi-one-dimensional SnO2 (n-type) is a remarkable material for such purpose. In this work, we discuss the characteristics of an Acetone gas sensor built in a metal-semiconductor-metal (MSM) architecture, using a SnO2 nanowire network as an activity layer. The crystallographic information was confirmed using XRD and found out to be monocrystalline and in a rutile structure. SEM images confirmed that the desired nanowire morphology was obtained. The Acetone gas concentration was varied from 50 to 970 PPM and sensor response ranged between 9 and 32% at room temperature. By operating in 0.1 V, with a sensitivity of 49% in 970 PPM, an optimized regime of the gas sensor was achieved. The rise time varied between 8.7 s and 13 s and decay time ranged between 48.1 s and 142.7 s. In addition, we demonstrated fast response time, stability and reproducibility, all essential features for a high-quality sensor. (AU)

• Processo FAPESP: 16/14381-4 - Nanofios semicondutores para o desenvolvimento de dispositivos fotovoltaicos
• Beneficiário: Adenilson José Chiquito
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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: 19/18963-6 - Estudo do comportamento de sensores de CO, CO2 e VOCs (compostos orgânicos voláteis) à base de nanofios de SnO2
• Beneficiário: Cleber Alexandre de Amorim
• Modalidade de apoio: Auxílio à Pesquisa - Regular