scholarly journals A Comparison of Commercially Available Screen-Printed Electrodes for Electrogenerated Chemiluminescence Applications

2021 ◽  
Vol 8 ◽  
Author(s):  
Emily Kerr ◽  
Richard Alexander ◽  
Paul S. Francis ◽  
Rosanne M. Guijt ◽  
Gregory J. Barbante ◽  
...  
Keyword(s):  
Electrode Surface ◽  
Homogeneous Solution ◽  
Electrogenerated Chemiluminescence ◽  
Platinum Electrodes ◽  
Oxide Formation ◽  
Detection Systems ◽  
Screen Printed Electrodes ◽  
Ordered Mesoporous ◽  
Surface Oxide Formation ◽  
Screen Printed

We examined a series of commercially available screen-printed electrodes (SPEs) for their suitability for electrochemical and electrogenerated chemiluminescence (ECL) detection systems. Using cyclic voltammetry with both a homogeneous solution-based and a heterogeneous bead-based ECL assay format, the most intense ECL signals were observed from unmodified carbon-based SPEs. Three commercially available varieties were tested, with Zensor outperforming DropSens and Kanichi in terms of sensitivity. The incorporation of nanomaterials in the electrode did not significantly enhance the ECL intensity under the conditions used in this evaluation (such as gold nanoparticles 19%, carbon nanotubes 45%, carbon nanofibers 21%, graphene 48%, and ordered mesoporous carbon 21% compared to the ECL intensity of unmodified Zensor carbon electrode). Platinum and gold SPEs exhibited poor relative ECL intensities (16% and 10%) when compared to carbonaceous materials, due to their high rates of surface oxide formation and inefficient oxidation of tri-n-propylamine (TPrA). However, the ECL signal at platinum electrodes can be increased ∼3-fold with the addition of a surfactant, which enhanced TPrA oxidation due to increasing the hydrophobicity of the electrode surface. Our results also demonstrate that each SPE should only be used once, as we observed a significant change in ECL intensity over repeated CV scans and SPEs cannot be mechanically polished to refresh the electrode surface.

scholarly journals Amperometric Biosensor for Pesticide Methamidophos Assay

2007 ◽  
Vol 50 (4) ◽  
pp. 239-241 ◽  
Author(s):  
Miroslav Pohanka ◽  
Kamil Kuča ◽  
Daniel Jun
Keyword(s):  
Electrode Surface ◽  
Ache Activity ◽  
Limit Of Detection ◽  
Sample Volume ◽  
Amperometric Biosensor ◽  
Platinum Electrodes ◽  
Screen Printed

Amperometric biosensor based on enzyme acetylcholinesterase (AChE; EC 3.1.1.7) was tested for pesticide methamidophos assay. Biosensor consists from four screen printed platinum electrodes on ceramic strip. AChE was physically adsorbed onto the electrode surface. The measuring principle was based on the inhibition of AChE activity in the presence of methamidophos. The proposed method limit of detection was 2.45 nM, responding to 3.46 pg of methamidophos detected absolutely when we consider the sample volume.

scholarly journals Stable Electrochemical Measurements of Platinum Screen-Printed Electrodes Modified with Vertical ZnO Nanorods for Bacterial Detection

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Thi Hong Phuoc Nguyen ◽  
Matteo Tonezzer ◽  
Thi Thanh Le Dang ◽  
Quang Khue Vu ◽  
Quang Huy Tran ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Salmonella Enteritidis ◽  
Electrochemical Impedance ◽  
Structural Characteristics ◽  
Bacterial Pathogens ◽  
Zno Nanorods ◽  
Electrochemical Measurements ◽  
Platinum Electrodes ◽  
Screen Printed Electrodes ◽  
Screen Printed

The study is aimed at investigating the stability of electrochemical and biosensing properties of ZnO nanorod-based platinum screen-printed electrodes (SPEs) applied for detection of bacterial pathogens. The platinum SPEs were designed and patterned according to standard photolithography and lift-off process on a silicon wafer. ZnO nanorods (NRs) were grown on the platinum working electrode by the hydrothermal method, whereas Salmonella polyclonal antibodies were selected and immobilized onto ZnO NR surface via a crosslinking process. Morphological and structural characteristics of ZnO NRs were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The results showed that the ZnO NRs were grown vertically on platinum electrodes with a diameter around 20-200 nm and a length of 5-7 μm. These modified electrodes were applied for detection of Salmonella enteritidis at a concentration of 103 cfu/mL by electrochemical measurements including cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The ZnO NR-modified platinum electrodes could detect Salmonella bacteria well with stable measurements, and the signal to noise ratio was much higher than that of 3 : 1. This study indicated that ZnO NR-modified platinum SPEs could be potential for the development of biochips for electrochemical detection of bacterial pathogens.

scholarly journals Screen-Printed Electrodes Modified with Metal Nanoparticles for Small Molecule Sensing

Biosensors ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 9 ◽  
Author(s):  
Daniel Antuña-Jiménez ◽  
María Begoña González-García ◽  
David Hernández-Santos ◽  
Pablo Fanjul-Bolado
Keyword(s):  
Metal Oxides ◽  
Electrochemical Deposition ◽  
Surface Functionalization ◽  
Electrode Surface ◽  
Organic Molecule ◽  
Recent Progress ◽  
Metal Nanoparticle ◽  
Screen Printed Electrodes ◽  
Different Types ◽  
Screen Printed

Recent progress in the field of electroanalysis with metal nanoparticle (NP)-based screen-printed electrodes (SPEs) is discussed, focusing on the methods employed to perform the electrode surface functionalization, and the final application achieved with different types of metallic NPs. The ink mixing approach, electrochemical deposition, and drop casting are the usual methodologies used for SPEs’ modification purposes to obtain nanoparticulated sensing phases with suitable tailor-made functionalities. Among these, applications on inorganic and organic molecule sensing with several NPs of transition metals, bimetallic alloys, and metal oxides should be highlighted.

Derivatization of SWCNTs with cobalt phthalocyanine residues and applications in screen printed electrodes for electrochemical detection of thiocholine

2011 ◽  
Vol 56 (11) ◽  
pp. 3988-3995 ◽  
Author(s):  
Elena Jubete ◽  
Kamila Żelechowska ◽  
Oscar A. Loaiza ◽  
Pedro J. Lamas ◽  
Estibalitz Ochoteco ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Cobalt Phthalocyanine ◽  
Screen Printed Electrodes ◽  
Screen Printed

scholarly journals How the anisotropy of surface oxide formation influences the transient activity of a surface reaction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
P. Winkler ◽  
J. Zeininger ◽  
Y. Suchorski ◽  
M. Stöger-Pollach ◽  
P. Zeller ◽  
...  
Keyword(s):  
Hydrogen Oxidation ◽  
Surface Oxidation ◽  
Surface Reactivity ◽  
Surface Oxide ◽  
Surface Structures ◽  
Oxide Formation ◽  
Reaction Fronts ◽  
Transient Activity ◽  
Surface Oxide Formation ◽  
Stepped Surface

AbstractScanning photoelectron microscopy (SPEM) and photoemission electron microscopy (PEEM) allow local surface analysis and visualising ongoing reactions on a µm-scale. These two spatio-temporal imaging methods are applied to polycrystalline Rh, representing a library of well-defined high-Miller-index surface structures. The combination of these techniques enables revealing the anisotropy of surface oxidation, as well as its effect on catalytic hydrogen oxidation. In the present work we observe, using locally-resolved SPEM, structure-sensitive surface oxide formation, which is summarised in an oxidation map and quantitatively explained by the novel step density (SDP) and step edge (SEP) parameters. In situ PEEM imaging of ongoing H2 oxidation allows a direct comparison of the local reactivity of metallic and oxidised Rh surfaces for the very same different stepped surface structures, demonstrating the effect of Rh surface oxides. Employing the velocity of propagating reaction fronts as indicator of surface reactivity, we observe a high transient activity of Rh surface oxide in H2 oxidation. The corresponding velocity map reveals the structure-dependence of such activity, representing a direct imaging of a structure-activity relation for plenty of well-defined surface structures within one sample.

scholarly journals Toward the Rapid Diagnosis of Sepsis: Detecting Interleukin-6 in Blood Plasma Using Functionalized Screen-Printed Electrodes with a Thermal Detection Methodology

2021 ◽  
Author(s):  
Robert D. Crapnell ◽  
Whitchuta Jesadabundit ◽  
Alejandro García-Miranda Ferrari ◽  
Nina C. Dempsey-Hibbert ◽  
Marloes Peeters ◽  
...  
Keyword(s):  
Blood Plasma ◽  
Interleukin 6 ◽  
Rapid Diagnosis ◽  
Screen Printed Electrodes ◽  
Thermal Detection ◽  
In Blood Plasma ◽  
Screen Printed

Enhanced voltammetric response of monosodium glutamate on screen-printed electrodes modified with NiAl layered double hydroxide films

2021 ◽  
pp. 101055
Author(s):  
Dora Domnica Baciu ◽  
Ruxandra Bîrjega ◽  
Valentina Mărăscu ◽  
Rodica Zăvoianu ◽  
Andreea Matei ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Monosodium Glutamate ◽  
Screen Printed Electrodes ◽  
Double Hydroxide ◽  
Screen Printed

Biological Multilayer Films Assembled by Redox Polymer and HRP on Screen-Printed Carbon Electrode

2012 ◽  
Vol 571 ◽  
pp. 56-59
Author(s):  
Yu Fang Sha ◽  
Mei Zhao ◽  
Ming Quan Yang ◽  
Hai Xin Bai ◽  
Man Zhao
Keyword(s):  
Horseradish Peroxidase ◽  
Electrostatic Interaction ◽  
Electrode Surface ◽  
Multilayer Films ◽  
Carbon Electrode ◽  
Layer By Layer ◽  
Redox Polymer ◽  
Screen Printed Carbon Electrode ◽  
Positively Charged ◽  
Screen Printed

Biological multilayer films of redox polymer and horseradish peroxidase (HRP) were successfully assembled on a screen-printed carbon electrode using layer-by-layer (LBL) assembled method based on the electrostatic interaction. The screen-printed carbon electrode surface was modified by the positively charged redox polymer, and the negatively charged HRP by LBL method.

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