The enhanced n-butanol sensing performance of In2O3 loaded NiO cuboid heterostructure

Autor(es)

Perrone, Olavo M. ; Roveda Jr, Antonio C. ; de Moraes, Daniel A. ; Volanti, Diogo P.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 930, p. 8-pg., 2023-01-05.

Resumo

Monitoring volatile organic compounds (VOCs) quickly and on-site is essential for preserving human health. The semiconductor gas sensor has been a promising strategy for detecting VOCs. However, stability, selectivity, and sensitivity are crucial for the practical application of a gas-sensor material. Innovative synthetic methods have been studied to improve the properties of sensor materials, such as better detection and stability and the construction of p-n heterojunction materials. In this work, NiO/In2O3 heterostructure was synthesized by fast microwave-assisted solvothermal (MAS) using nickel foam and indium nitrate and was studied as a gas sensor for detecting several VOCs. NiO/In2O3 has the combined properties of NiO, a ptype material, and of In2O3, an n-type. NiO/In2O3 presented a superior performance for detecting n-butanol at the ideal operating temperature (350 degrees C), with a fast response (6 s), good selectivity, and stability. The nButanol response at 100 ppm was R-a/R-g = 412 +/- 16, and a linear detection range from 1 to 200 ppm was achieved. The best sensing response for this material towards n-butanol is attributed to the electron depletion layer caused by NiO/In2O3 junction and more adsorption sites obtained during fast MAS synthesis. (c) 2022 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 19/11058-6 - Sensores de gás à base de compósitos de carbono provenientes da reação de decomposição catalítica do metano
• Beneficiário: Olavo Micali Perrone
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 20/06421-1 - Desenvolvimento de sensores derivados de estruturas metal-orgânicas para detecção de compostos orgânicos voláteis microbianos
• Beneficiário: Diogo Paschoalini Volanti
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos
• Beneficiário: José Maria Correa Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Temático