Lamellar metal oxide and organic hybrid sensor for room temperature alcohol gas detection

Author(s)

de Franca, Morgana Muller ; Schmidt, Ariane ; Santos, Aelton Baptista ; dos Santos, Talitha Ramos Canabarra ; Zarbin, Aldo Jose Gorgatti ; Woellner, Cristiano Francisco ; Wouk, Luana ; Roman, Lucimara Stolz

• Document type: Journal article
• Source: Journal of Materials Science; v. 60, n. 2, p. 16-pg., 2024-12-26.

Abstract

Molybdenum trioxide, used in high-temperature applications, has limitations in common operating environments due to its lacking electrical conductivity. In order to develop alcohol (ethanol and methanol) gas detecting devices based on its lamellar properties, composites were developed using lamellar MoO3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hbox {MoO}_3$$\end{document}, obtained through the chemical delamination method in isopropanol, combined with organic materials, PEDOT:PSS. DFT simulations investigated the effect of PEDOT:PSS on MoO3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hbox {MoO}_3$$\end{document} conductivity, aiming to broaden its functionality for conventional environmental operation. The results showed that the presence of the organic materials changed the properties of MoO3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hbox {MoO}_3$$\end{document} from an insulator to a conductor. PEDOT:PSS was investigated, in different volumetric proportions, in order to assess the effectiveness of MoO3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hbox {MoO}_3$$\end{document} in different configurations. To characterize the thin films, scanning electron microscopy (SEM) images, Raman spectroscopy, and electrical analyses were used. It was observed that at higher volumetric ratios of MoO3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hbox {MoO}_3$$\end{document} to PEDOT:PSS (30:1), the response time for saturation was reduced, and the electrical variation was extended. In addition, a correlation was observed between the electrical response and the concentration of PEDOT:PSS. (AU)

• FAPESP's process: 19/17874-0 - Multi-user Equipmente approved in grant 2013/08293-7, KAHUNA upgrade - HPE Apollo Gen10 supercomputer
• Grantee: Munir Salomao Skaf
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 13/08293-7 - CCES - Center for Computational Engineering and Sciences
• Grantee: Munir Salomao Skaf
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC