CuO/SnS₂ Nanoparticles on PEDOT:PSS for Nonenzymatic Electrochemical Glucose Sensors

Abstract

Metal dichalcogenide semiconductor and metal oxide−based sensors exhibit high electron-transfer rates and remarkable electrocatalytic performance for nonenzymatic glucose detection. Herein, a lightweight, ultrathin, and portable flexible sensor based on copper oxide/tin sulfide nanoparticles on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (CuO/ SnS 2 NP−PEDOT:PSS, CSPP) is presented for glucose detection at room temperature. The CuO/SnS 2 NPs were synthesized via a hydrothermal method and incorporated into PEDOT:PSS for enhancing the electrical conductivity. The X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, fieldemission transmission electron microscopy, and energy-dispersive X-ray spectroscopy mapping confirm the formation of highqualitative CuO NPs and SnS 2 nanosheets embedded within the PEDOT:PSS matrix. The CSPP nanocomposites were dropped onto the working electrode of screen-printed graphite electrodes on a plastic substrate via a simple drop-casting method to produce the nonenzymatic glucose electrochemical sensor. The cyclic voltammetry and chronoamperometry results indicate that the CSPP electrochemical sensor exhibits good sensitivity and selectivity to glucose in a wide concentration range of 0−20 mM, providing a detection limit of 9.7 μM. The glucose-sensing mechanism based on the reduction of CSPP is proposed.

Non-Invasive Multi-Gas Detection Enabled by Cu-CuO/PEDOT Microneedle Sensor

“…At least three chemically distinct sulfur species are existed, with lower peaks at 161.7 eV, 162.8 eV, and 163.2 eV, matching well with the spin-split components of the sulfur atoms in PEDOT [ 41 , 42 ]. In Figure 3 c, the three peaks of C 1s from PEDOT are located at 284.58, 285.5, and 288.5 eV, attributed to C–C, C–O, and C–O–C, respectively [ 43 , 44 ]. Figure 3 d exhibits three peaks at binding energies of 530.2 eV, 531.7 eV, and 533.1 eV in the O 1s region, which could be attributed to adsorbed O and lattice oxygen [ 45 ].…”

“…In Figure 3c, the three peaks of C 1s from PEDOT are located at 284.58, 285.5, and 288. 5 eV, attributed to C-C, C-O, and C-O-C, respectively [43,44]. Figure 3d exhibits three peaks at binding energies of 530.2 eV, 531.7 eV, and 533.1 eV in the O 1s region, which could be attributed to adsorbed O and lattice oxygen [45].…”

Nanoparticles of SnS on Carbon Nanofibers for Electrochemical Detection of Vanillin

“…Tin sulfide, classified as an IV–VI group semiconductor, is pivotal due to its narrow direct band gap and p-type semiconductor nature. , These characteristics are instrumental in facilitating redox reactions at the electrode–electrolyte interface, crucial for the electrochemical detection processes. , The inherent p-type conductivity of SnS, primarily due to native defects, significantly augments its electrocatalytic efficiency. This property is critical for enhancing the sensor’s sensitivity and for minimizing the limit of detection (LOD) in electrochemical assays.…”