TY  - JOUR
A1  - Morais, Paulo V.
A1  - Suman, Pedro H.
A1  - Schöning, Michael Josef
A1  - Siqueira Junior, José R.
A1  - Orlandi, Marcelo O.
T1  - Layer-by-layer film based on Sn₃O₄ nanobelts as sensing units to detect heavy metals using a capacitive field-effect sensor platform
JF  - Chemosensors
N2  - 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.
KW  - Sn₃O₄
KW  - nanobelts
KW  - field-effect sensor
KW  - LbL films
KW  - heavy metals
Y1  - 2023
U6  - http://dx.doi.org/10.3390/chemosensors11080436
SN  - 2227-9040
N1  - This article belongs to the Special Issue The Application of Electrochemical Sensors or Biosensors Based on Nanomaterials
VL  - 11
IS  - 8
PB  - MDPI
CY  - Basel
ER  -