Tunning the Gas Sensing Properties of rGO with In2O3 Nanoparticles

Autor(es)

de Lima, Bruno S. ; Komorizono, Amanda A. ; Ndiaye, Amadou L. ; Bernardi, Maria Ines B. ; Brunet, Jerome ; Mastelaro, Valmor R.

• Tipo de documento: Artigo Científico
• Fonte: SURFACES; v. 5, n. 1, p. 16-pg., 2022-03-01.

Resumo

Here, we discuss the effect of In2O3 nanoparticles on the reduced graphene oxide (rGO) gas-sensing potentialities. In2O3 nanoparticles were prepared with the polymer precursors method, while the nanocomposites were prepared by mixing an In2O3 nanoparticle suspension with an rGO suspension in different proportions. The gas-sensing performance of our materials was tested by exposing our materials to known concentrations of a target toxic gas in a dry airflow. Our results demonstrate that In2O3 nanoparticles enhance the rGO sensitivity for strong oxidizing species such as O-3 and NO2, while a negative effect on its sensitivity for NH3 sensing is observed. Furthermore, our measurements towards H2S suggest that the concentration of In2O3 nanoparticles can induce an uncommon transition from p-type to n-type semiconductor nature when rGO-In2O3 nanocomposites operate at temperatures close to 160 degrees C. (AU)

• Processo FAPESP: 19/22899-1 - Nanocompósitos a base de grafeno para aplicações como sensores de gás
• Beneficiário: Bruno Sanches de Lima
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 18/07517-2 - Compósitos de grafeno e óxidos metálicos: aplicação como sensores de gases tóxicos
• Beneficiário: Bruno Sanches de Lima
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado