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

Chemosensors, vol. 11, pp. 436

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.

Authors 5

1. Paulo Vitor de Morais

   Universidade Estadual Paulista (Unesp) · Universidade Federal do Triângulo Mineiro

   Affiliation as printed

   Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, SP, Brazil

   Laboratory of Applied Nanomaterials and Nanostructures (LANNA), Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM), Uberaba 38064-200, MG, Brazil

2. Pedro H. Suman

   Universidade Estadual Paulista (Unesp)

   Affiliation as printed

   Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, SP, Brazil

3. Michael Josef Schöning Aachen Institute of Nano- and Biotechnologies (INB)

   FH Aachen · Forschungszentrum Jülich

   Affiliation as printed

   Institute of Biological Information Processing (IBI-3), Forschungszentrum Jülich, 52425 Jülich, Germany

   Institute of Nano- and Biotechnologies (INB), FH Aachen, Campus Jülich, 52428 Jülich, Germany

4. José Roberto Siqueira Junior corresponding

   Universidade Federal do Triângulo Mineiro

   Affiliation as printed

   Laboratory of Applied Nanomaterials and Nanostructures (LANNA), Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM), Uberaba 38064-200, MG, Brazil

5. Marcelo Ornaghi Orlandi

   Universidade Estadual Paulista (Unesp)

   Affiliation as printed

   Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, SP, Brazil