Layer-by-Layer Film Based on Sn₃O₄ Nanobelts as Sensing Units to Detect Heavy Metals Using a Capacitive Field-Effect Sensor Platform

Author(s)

Morais, Paulo V. ; Suman, Pedro H. ; Schoening, Michael J. ; Siqueira Jr, Jose R. ; Orlandi, Marcelo O.

• Document type: Journal article
• Source: CHEMOSENSORS; v. 11, n. 8, p. 11-pg., 2023-08-01.

Abstract

Lead and nickel, as heavy metals, are still used in industrial processes, and are classified as "environmental health hazards" due to their toxicity and polluting potential. The detection of heavy metals can prevent environmental pollution at toxic levels that are critical to human health. In this sense, the electrolyte-insulator-semiconductor (EIS) field-effect sensor is an attractive sensing platform concerning the fabrication of reusable and robust sensors to detect such substances. This study is aimed to fabricate a sensing unit on an EIS device based on Sn3O4 nanobelts embedded in a polyelectrolyte matrix of polyvinylpyrrolidone (PVP) and polyacrylic acid (PAA) using the layer-by-layer (LbL) technique. The EIS-Sn3O4 sensor exhibited enhanced electrochemical performance for detecting Pb2+ and Ni2+ ions, revealing a higher affinity for Pb2+ ions, with sensitivities of ca. 25.8 mV/decade and 2.4 mV/decade, respectively. Such results indicate that Sn3O4 nanobelts can contemplate a feasible proof-of-concept capacitive field-effect sensor for heavy metal detection, envisaging other future studies focusing on environmental monitoring. (AU)

• FAPESP's process: 17/26219-0 - Study of Single Element Chemical Sensor Devices based on Semiconducting Metal Oxide Materials
• Grantee: Marcelo Ornaghi Orlandi
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/20808-0 - Field-effect transistors (FET) based on 1D semiconducting nanostructures: impact of the electrical signal modulation on the gas sensor performance
• Grantee: Pedro Henrique Suman
• Support Opportunities: Scholarships in Brazil - Post-Doctoral