Novel electrochemical sensors with electrodes based on multilayers fabricated by layer-by-layer synthesis and their analytical potential

2016 ◽  
Vol 85 (8) ◽  
pp. 880-900 ◽  
Author(s):  
S S Ermakov ◽  
K G Nikolaev ◽  
V P Tolstoy
Keyword(s):  
Electrochemical Sensors ◽  
Layer By Layer ◽  
Analytical Potential

scholarly journals Development of a Novel Biosensor Using Cationic Antimicrobial Peptide and Nickel Phthalocyanine Ultrathin Films for Electrochemical Detection of Dopamine

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Maysa F. Zampa ◽  
Inês Maria de S. Araújo ◽  
José Ribeiro dos Santos Júnior ◽  
Valtencir Zucolotto ◽  
José Roberto de S. A. Leite ◽  
...  
Keyword(s):  
Antimicrobial Peptide ◽  
Electrochemical Sensors ◽  
Biological Fluids ◽  
Fundamental Aspect ◽  
Layer By Layer ◽  
Cationic Antimicrobial Peptide ◽  
Nickel Phthalocyanine ◽  
Layer Technique ◽  
Potential Applications ◽  
Pharmaceutical Industries

The antimicrobial peptide dermaseptin 01 (DS 01), from the skin secretion ofPhyllomedusa hypochondrialisfrogs, was immobilized in nanostructured layered films in conjunction with nickel tetrasulfonated phthalocyanines (NiTsPc), widely used in electronic devices, using layer-by-layer technique. The films were used as a biosensor to detect the presence of dopamine (DA), a neurotransmitter associated with diseases such as Alzheimer's and Parkinson's, with detection limits in the order of 10−6 mol L−1. The use of DS 01 in LbL film generated selectivity in the detection of DA despite the presence of ascorbic acid found in biological fluids. This work is the first to report that the antimicrobial peptide and NiTsPc LbL film exhibits electroanalytical activity to DA oxidation. The selectivity in the detection of DA is a fundamental aspect for the development of electrochemical sensors with potential applications in the biomedical and pharmaceutical industries.

scholarly journals Nanoporous hybrid CuO/ZnO/carbon papers used as ultrasensitive non-enzymatic electrochemical sensors

RSC Advances ◽  
2019 ◽  
Vol 9 (71) ◽  
pp. 41886-41892
Author(s):  
Minwei Zhang ◽  
Wenrui Zhang ◽  
Fei Chen ◽  
Chengyi Hou ◽  
Arnab Halder ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Sensors ◽  
Carbon Paper ◽  
Layer By Layer ◽  
Sacrificial Template ◽  
Graphene Oxide Paper

In this research, we demonstrate a facile approach for the synthesis of a graphite-analogous layer-by-layer heterostructured CuO/ZnO/carbon paper using a graphene oxide paper as a sacrificial template.

Layer-by-layer nanostructured films for electrochemical sensors fabrication

2022 ◽  
pp. 407-441
Author(s):  
Celina M. Miyazaki ◽  
Flavio M. Shimizu ◽  
Marystela Ferreira
Keyword(s):  
Electrochemical Sensors ◽  
Layer By Layer ◽  
Nanostructured Films

scholarly journals Electrochemical sensors based on carbon nanotubes and their use in biomedical research.Part 2: sensors manufactured by dispersion of carbon nanotubes by means of polyethyleneimine, organic dyes, cyclodextrins, chitosan, proteins, room-temperature ionic liquids, gels, and thiols. Sensors manufactured by dispersion of carbon nanotubes by electropolymerization process. sensors manufactured by dispersion of carbon nanotubes by layer-by-layer deposition

2012 ◽  
Vol 58 (2) ◽  
pp. 144-159 ◽  
Author(s):  
V.A. Buzanovskii
Keyword(s):  
Carbon Nanotubes ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Electrochemical Sensors ◽  
Organic Dyes ◽  
General Information ◽  
Room Temperature Ionic Liquids ◽  
Layer By Layer ◽  
Layer Deposition ◽  
Manufacturing Techniques

Electrochemical sensors based on carbon nanotubes are widely distributed in biomedical researches. One group of these sensors contains the sensors manufactured by dispersion of carbon nanotubes on an electrode surface by means of polyethyleneimine, organic dyes, cyclodextrins, chitosan, proteins, room-temperature ionic liquids, gels, thiols, by electropolymerization process, and by layer-by-layer deposition. The development directions of such sensors are analyzed. The general information on manufacturing techniques of these sensors is submitted. The opportunities of these sensors for carrying out biomedical researches are demonstrated.

Uric Acid Sensor Based on PEDOT:PSS Modified Screen-Printed Carbon Electrode Fabricated with a Simple Painting Technique

2021 ◽  
Vol 24 (2) ◽  
pp. 43-50
Author(s):  
Wulan Tri Wahyuni ◽  
Rudi Heryanto ◽  
Eti Rohaeti ◽  
Achmad Fauzi ◽  
Budi Riza Putra
Keyword(s):  
Uric Acid ◽  
Electrochemical Sensors ◽  
Limit Of Detection ◽  
Electrochemical Measurement ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Layer By Layer ◽  
Screen Printed Carbon Electrode ◽  
Limit Of Quantitation ◽  
Screen Printed

A screen-printed carbon electrode is a suitable electrode for electrochemical sensors due to its simplicity and portability. This study aimed to fabricate a screen-printed carbon electrode modified with poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (SPCE-PEDOT:PSS) to improve the electrochemical performance for uric acid detection. The SPCE was fabricated using a layer-by-layer painting process of conductive ink consisting of graphite as a conductive material, polystyrene as a polymeric binder, and dichloromethane solvent on a polyvinyl chloride paper substrate. The fabricated SPCE was then modified with PEDOT:PSS by a drop-casting method. The characterization of SPCE-PEDOT:PSS surface morphology was performed using the scanning electron microscopy technique. The SPCE-PEDOT:PSS provided an acceptable linearity (R2 = 0.9985, 0.9993, 0.9985), sensitivity (0.070, 0.015, 0.024 µA/µM), precision (%RSD = 2.70%, 2.89%, 2.40%), limit of detection (1.61 µM, 1.14 µM, 1.62 µM), and limit of quantitation (5.37 µM, 3.81 µM to 5.39 µM) in measurement of uric acid standard solution using cyclic voltammetry, amperometry, and differential pulse voltammetry techniques, respectively. The studies using SPCE-PEDOT:PSS indicated that the electrode could be applied in the electrochemical measurement of uric acid in the human urine sample.

Layer-by-Layer films based on biopolymers extracted from red seaweeds and polyaniline for applications in electrochemical sensors of chromium VI

2015 ◽  
Vol 200 ◽  
pp. 9-21 ◽  
Author(s):  
Emanuel Airton de Oliveira Farias ◽  
Marianne Corrêa dos Santos ◽  
Natália de Araujo Dionísio ◽  
Patrick V. Quelemes ◽  
José Roberto de Souza Almeida Leite ◽  
...  
Keyword(s):  
Electrochemical Sensors ◽  
Layer By Layer ◽  
Red Seaweeds ◽  
Chromium Vi

scholarly journals Polyelectrolytes Assembly: A Powerful Tool for Electrochemical Sensing Application

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3211
Author(s):  
Ivana Škugor Rončević ◽  
Denis Krivić ◽  
Maša Buljac ◽  
Nives Vladislavić ◽  
Marijo Buzuk
Keyword(s):  
Electrochemical Sensors ◽  
System Development ◽  
Physical Stability ◽  
Electrochemical Sensing ◽  
Layer By Layer ◽  
Electronic Communications ◽  
Sensing Systems ◽  
Sensing Applications ◽  
Coating Methods

The development of sensing coatings, as important sensor elements that integrate functionality, simplicity, chemical stability, and physical stability, has been shown to play a major role in electrochemical sensing system development trends. Simple and versatile assembling procedures and scalability make polyelectrolytes highly convenient for use in electrochemical sensing applications. Polyelectrolytes are mainly used in electrochemical sensor architectures for entrapping (incorporation, immobilization, etc.) various materials into sensing layers. These materials can often increase sensitivity, selectivity, and electronic communications with the electrode substrate, and they can mediate electron transfer between an analyte and transducer. Analytical performance can be significantly improved by the synergistic effect of materials (sensing material, transducer, and mediator) present in these composites. As most reported methods for the preparation of polyelectrolyte-based sensing layers are layer-by-layer and casting/coating methods, this review focuses on the use of the latter methods in the development of electrochemical sensors within the last decade. In contrast to many reviews related to electrochemical sensors that feature polyelectrolytes, this review is focused on architectures of sensing layers and the role of polyelectrolytes in the development of sensing systems. Additionally, the role of polyelectrolytes in the preparation and modification of various nanoparticles, nanoprobes, reporter probes, nanobeads, etc. that are used in electrochemical sensing systems is also reviewed.

Microstructural characterization of CoPtCr/Cr thin film disks by cross-section TEM and elongated probe micro-diffraction

1991 ◽  
Vol 49 ◽  
pp. 762-763
Author(s):  
M.A. Parker ◽  
K.E. Johnson ◽  
C. Hwang ◽  
A. Bermea
Keyword(s):  
Magnetic Recording ◽  
Electron Probe ◽  
Microstructural Characterization ◽  
Crystallographic Structure ◽  
Recording Media ◽  
Layer By Layer ◽  
Cross Sectional ◽  
New Techniques ◽  
Polished Side

We have reported the dependence of the magnetic and recording properties of CoPtCr recording media on the thickness of the Cr underlayer. It was inferred from XRD data that grain-to-grain epitaxy of the Cr with the CoPtCr was responsible for the interaction observed between these layers. However, no cross-sectional TEM (XTEM) work was performed to confirm this inference. In this paper, we report the application of new techniques for preparing XTEM specimens from actual magnetic recording disks, and for layer-by-layer micro-diffraction with an electron probe elongated parallel to the surface of the deposited structure which elucidate the effect of the crystallographic structure of the Cr on that of the CoPtCr.XTEM specimens were prepared from magnetic recording disks by modifying a technique used to prepare semiconductor specimens. After 3mm disks were prepared per the standard XTEM procedure, these disks were then lapped using a tripod polishing device. A grid with a single 1mmx2mm hole was then glued with M-bond 610 to the polished side of the disk.

Epitaxial growth manner and structure of superconducting oxide films

1990 ◽  
Vol 48 (4) ◽  
pp. 2-3
Author(s):  
Yoshichika Bando ◽  
Takahito Terashima ◽  
Kenji Iijima ◽  
Kazunuki Yamamoto ◽  
Kazuto Hirata ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Film Surface ◽  
High Energy ◽  
Epitaxial Films ◽  
Layer By Layer ◽  
Initial Growth ◽  
In Situ Growth ◽  
High Quality ◽  
Activated Reactive Evaporation

The high quality thin films of high-Tc superconducting oxide are necessary for elucidating the superconducting mechanism and for device application. The recent trend in the preparation of high-Tc films has been toward “in-situ” growth of the superconducting phase at relatively low temperatures. The purpose of “in-situ” growth is to attain surface smoothness suitable for fabricating film devices but also to obtain high quality film. We present the investigation on the initial growth manner of YBCO by in-situ reflective high energy electron diffraction (RHEED) technique and on the structural and superconducting properties of the resulting ultrathin films below 100Å. The epitaxial films have been grown on (100) plane of MgO and SrTiO, heated below 650°C by activated reactive evaporation. The in-situ RHEED observation and the intensity measurement was carried out during deposition of YBCO on the substrate at 650°C. The deposition rate was 0.8Å/s. Fig. 1 shows the RHEED patterns at every stage of deposition of YBCO on MgO(100). All the patterns exhibit the sharp streaks, indicating that the film surface is atomically smooth and the growth manner is layer-by-layer.

Compact back-scattered electrons' energy analyzer for standard SEM

1994 ◽  
Vol 52 ◽  
pp. 488-489
Author(s):  
S. Likharev ◽  
A. Kramarenko ◽  
V. Vybornov
Keyword(s):  
Depth Resolution ◽  
High Energy ◽  
Primary Beam ◽  
Layer By Layer ◽  
Energy Analyzer ◽  
High Energy Part ◽  
Small Window ◽  
Energy Part ◽  
Wide Range ◽  
High Voltage Supply

At present time the interest is growing considerably for theoretical and experimental analysis of back-scattered electrons (BSE) energy spectra. It was discovered that a special angle and energy nitration of BSE flow could be used for increasing a spatial resolution of BSE mode, sample topography investigations and for layer-by layer visualizing of a depth structure. In the last case it was shown theoretically that in order to obtain suitable depth resolution it is necessary to select a part of BSE flow with the directions of velocities close to inverse to the primary beam and energies within a small window in the high-energy part of the whole spectrum.A wide range of such devices has been developed earlier, but all of them have considerable demerit: they can hardly be used with a standard SEM due to the necessity of sufficient SEM modifications like installation of large accessories in or out SEM chamber, mounting of specialized detector systems, input wires for high voltage supply, screening a primary beam from additional electromagnetic field, etc. In this report we present a new scheme of a compact BSE energy analyzer that is free of imperfections mentioned above.

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