Tunning the Gas Sensing Properties of rGO with In2O3 Nanoparticles

Author(s)

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

• Document type: Journal article
• Source: SURFACES; v. 5, n. 1, p. 16-pg., 2022-03-01.

Abstract

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)

• FAPESP's process: 19/22899-1 - Graphene-based nanocomposites for gas sensing applications
• Grantee: Bruno Sanches de Lima
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 18/07517-2 - Graphene and metal oxides composites: application as toxic gas sensors
• Grantee: Bruno Sanches de Lima
• Support Opportunities: Scholarships in Brazil - Post-Doctoral