Screen Printed Carbon Electrodes Modified with 3D Nanostructured Materials for Bioanalysis

Şen, Mustafa; Azizi, Ehsan; Avcı, İpek; Aykaç, Ahmet; Ensarioğlu, Kenan; Ok, İzel; Yavuz, Gülper Feyza; Güneş, Fethullah

doi:10.1002/elan.202100624

Cited by 7 publications

(2 citation statements)

References 51 publications

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“…Electrochemical impedance spectroscopy (EIS) mea- surements of bare SPCE and SUWO 3 /SPCE were performed in a 5mM [Fe(CN) 6 ] −3∕4 solution containing 100 mM KCl. The impedance spectra were recorded at open circuit potential in a frequency range of 0.1 Hz to 10 kHz with a 10mV amplitude signal [23]. The R 𝑐𝑡 values were obtained using the Randles circuit model through the fit and simulation program of the AUTOLAB 302 Nova 2.1.5 software.…”

Section: Electrochemical Characterization Of Suwo 3 /Spcementioning

confidence: 99%

Highly Sensitive and Selective Electrochemical Detection of Dopamine and Uric Acid Using Sea Urchin-like Tungsten Oxide Nanostructure Modified SPCE

Oğuz

Aykaç

Şen

2023

Preprint

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Here, screen-printed carbon electrodes (SPCEs) were modified with ultrafine and mainly monodisperse sea urchin-like tungsten oxide (SUWO3) nanostructures synthesized by a simple one-pot hydrothermal method for highly sensitive and selective detection of dopamine (DA) and uric acid (UA). Sea urchin-like nanostructures were clearly observed in scanning electron microscope images and WO3 composition was confirmed with XRD, FTIR and UV-Vis spectrophotometer. Modification SPCEs with SUWO3 nanostructures via the drop-casting method clearly reduced the R𝑐𝑡 value of the electrodes, lowered the ΔEp and enhanced the DA oxidation current due to high electrocatalytic activity. As a result, SUWO3/SPCEs enabled highly sensitive detection of DA (LOD: 51.4 nM and sensitivity: 127 μAmM−1cm−2) and UA (LOD: 253 nM and sensitivity: 55.9 μAmM−1cm−2) at low concentration. Lastly, SUWO3/SPCEs were tested with artificial urine, in which acceptable recoveries for both molecules were obtained. Given the high selectivity, the sensor has the potential to be used for highly sensitive simultaneous detection of DA and UA in real biological samples

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Section: Electrochemical Characterization Of Suwo 3 /Spcementioning

confidence: 99%

Highly Sensitive and Selective Electrochemical Detection of Dopamine and Uric Acid Using Sea Urchin-like Tungsten Oxide Nanostructure Modified SPCE

Oğuz

Aykaç

Şen

2023

Preprint

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“…Basically, the generator and collector electrodes were set at +0.35 V and 0 V (vs. Ag/AgCl) for 50 s and the oxidation and reduction currents at 50 s were used to obtain a calibration curve. The limit of detection (LOD) was calculated based on three replicates using the following equation: LOD = 3.3 × (standard deviation of the calibration curve/slope of the calibration curve) [7,8]. All electrochemical experiments were performed using a multipotentiostat.…”

Section: Redox-cyclingmentioning

confidence: 99%

Electrochemical detection of dopamine using a simple redox cycling-based device

Şen

2022

Preprint

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Here, a dual ITO microchip was fabricated for high sensitive detection of dopamine (DA) based on redox-cycling. The ITO electrodes with 3×3 mm working areas were made via photolithography and dry etching processes. The microchip was obtained by first aligning the working areas of two ITO electrodes to overlap and then fixing them in that position using a double-sided tape, which also formed a sealed microchannel between the ITO electrodes for test solution delivery. The ITO electrodes and microchips were electrochemically characterized using EIS, cyclic voltammetry and chronoamperometry. Compared to a single ITO electrode in a microchannel, the microchip had a significantly higher signal due to redox cycling. The microchip was lastly used for the detection of DA at varying concentrations. According to the results, the microchip had an LOD of 0.15 μM in a linear detection region of 0.1 to 50 μM. The microchip requires less than 1 μl of solution to complete the analysis and has great potential to be applied for immunosensing.

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Seeding Layer Effect on the Microstructure of Hydrothermally Grown α‐Manganese Dioxide Nanowires on Three‐Dimensional Graphene Foam

Feyza Yavuz,

Güneş,

Bartu Aydın

et al. 2024

ChemistrySelect

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Hydrothermal synthesis is a straightforward approach for producing high‐yield manganese dioxide (MnO2) nanostructures with efficient morphological control at low temperatures. This study investigates the microstructural dependency of hydrothermally grown α‐MnO2 nanowires (NWs) on pre‐treatment conditions on the substrate surface. Within this scope, α‐MnO2 NWs were synthesized on chemical vapor deposition (CVD)‐based graphene foam (GF) substrates pre‐treated via potassium permanganate (KMnO4) solution as a seeding layer with different concentrations (0.025, 0.050, 0.075, 0.1 M). A direct α‐MnO2 NWs growth (without pre‐treatment) was also performed on GF by hydrothermal method. The seeding layer effect on the NWs growth was elaborated to comprehend the process‐structure correlations by characterizing the resultant graphene foam/α‐MnO2 nanowires (GF/α‐MnO2 NWs) nanocomposites through Scanning Electron Microscopy (SEM), Raman Spectroscopy, X‐Ray Diffraction (XRD), and X‐Ray Photoelectron Spectroscopy (XPS). SEM, XRD, and Raman Spectroscopy revealed the successful acquisition of highly crystalline α‐MnO2 in one‐dimensional nanowire morphology on the high‐quality GF. Moreover, XPS results confirmed that all nanocomposites comprise α‐MnO2 and graphene without chemical degradation. Consequently, slight changes in solution concentration of seeding layers caused a noticeable alteration in the nanowire's structure, which could ensure effective control of nanocomposite properties without sacrificing the high purity of each component.

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Screen Printed Carbon Electrodes Modified with 3D Nanostructured Materials for Bioanalysis

Cited by 7 publications

References 51 publications

Highly Sensitive and Selective Electrochemical Detection of Dopamine and Uric Acid Using Sea Urchin-like Tungsten Oxide Nanostructure Modified SPCE

Highly Sensitive and Selective Electrochemical Detection of Dopamine and Uric Acid Using Sea Urchin-like Tungsten Oxide Nanostructure Modified SPCE

Electrochemical detection of dopamine using a simple redox cycling-based device

Seeding Layer Effect on the Microstructure of Hydrothermally Grown α‐Manganese Dioxide Nanowires on Three‐Dimensional Graphene Foam

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