scholarly journals Phosphate Modified Screen Printed Electrodes by LIFT Treatment for Glucose Detection

Biosensors ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 91 ◽  
Author(s):  
Francesco Milano ◽  
Livia Giotta ◽  
Daniela Chirizzi ◽  
Simos Papazoglou ◽  
Christina Kryou ◽  
...  
Keyword(s):  
Glassy Carbon ◽  
Glucose Sensor ◽  
Adsorbed Layer ◽  
Target Surface ◽  
Force Microscopy ◽  
Atomic Force ◽  
Screen Printed Electrodes ◽  
Forward Transfer ◽  
Glucose Electrooxidation ◽  
Screen Printed

The design of new materials as active layers is important for electrochemical sensor and biosensor development. Among the techniques for the modification and functionalization of electrodes, the laser induced forward transfer (LIFT) has emerged as a powerful physisorption method for the deposition of various materials (even labile materials like enzymes) that results in intimate and stable contact with target surface. In this work, Pt, Au, and glassy carbon screen printed electrodes (SPEs) treated by LIFT with phosphate buffer have been characterized by scanning electron microscopy and atomic force microscopy to reveal a flattening effect of all surfaces. The electrochemical characterization by cyclic voltammetry shows significant differences depending on the electrode material. The electroactivity of Au is reduced while that of glassy carbon and Pt is greatly enhanced. In particular, the electrochemical behavior of a phosphate LIFT treated Pt showed a marked enrichment of hydrogen adsorbed layer, suggesting an elevated electrocatalytic activity towards glucose oxidation. When Pt electrodes modified in this way were used as an effective glucose sensor, a 1–10 mM linear response and a 10 µM detection limit were obtained. A possible role of phosphate that was securely immobilized on a Pt surface, as evidenced by XPS analysis, enhancing the glucose electrooxidation is discussed.

scholarly journals Electrochemical characterisation of novel screen-printed carbon paste electrodes for voltammetric measurements

2017 ◽  
Vol 82 (7-8) ◽  
pp. 865-877 ◽  
Author(s):  
Milan Sýs ◽  
Elmorsy Khaled ◽  
Radovan Metelka ◽  
Karel Vytřas
Keyword(s):  
Glassy Carbon ◽  
Carbon Paste Electrode ◽  
Carbon Powder ◽  
Carbon Paste ◽  
Surface Characterisation ◽  
Carbon Paste Electrodes ◽  
Screen Printed Electrodes ◽  
Paste Electrode ◽  
Carbon Based ◽  
Screen Printed

This work is focused on the homemade screen-printed carbon paste electrode containing basically graphite powder (or glassy carbon powder), poly(vinylbchloride) (PVC) and paraffin oil. It compares the electrochemical properties of conventional carbon-based electrodes and prepared screen-printed carbon paste electrodes towards [Fe(CN)6]3-/[Fe(CN)6]4- and quinone/hydroquinone redox couples. Significant attention is paid to the development of the corresponding carbon inks, printing and the surface characterisation of the resulting electrodes by the scanning electron microscopy. An optimization consisted of the selection of the organic solvent, the optimal content of the used polymer with the chosen paste binder, appropriate isolation of electric contact, etc. Very similar properties of the prepared screen-printed electrodes, containing only corresponding carbon powder and 3 % PVC, with their conventional carbon paste electrode and glassy carbon-based electrodes, were observed during their characterisation. Screen-printed electrodes, with the pasting liquid usually provided satisfactory analytical data. Moreover, they can be used in the flow injection analysis and could undoubtedly replace the carbon paste grooved electrodes. It can be assumed that certain progress in the development of electrode materials was achieved by this research.

MICROCRACKS IN ~ 100 MeV Si7+-ION-IRRADIATED p-SILICON SURFACES

2004 ◽  
Vol 11 (03) ◽  
pp. 265-269
Author(s):  
O. P. SINHA ◽  
P. C. SRIVASTAVA ◽  
V. GANESAN
Keyword(s):  
Atomic Force Microscopy ◽  
Surface Morphology ◽  
Target Surface ◽  
Silicon Surfaces ◽  
Force Microscopy ◽  
Atomic Force ◽  
Induced Stress

The p-silicon surfaces have been irradiated with ~ 100 MeV Si 7+ions to a fluence of 2.2×1013 ions cm -2, and surface morphology has been studied with atomic force microscopy (AFM). Interesting features of cracks of ~ 47 nm in depth and ~ 103 nm in width on the irradiated surfaces have been observed. The observed features seemed to have been caused by the irradiation-induced stress in the irradiated regions of the target surface.

Electrochemical Determination of Dopamine with Ruthenium(III)-Modified Glassy Carbon and Screen-Printed Electrodes

2017 ◽  
Vol 50 (10) ◽  
pp. 1602-1619 ◽  
Author(s):  
Safeta Redžić ◽  
Emira Kahrović ◽  
Adnan Zahirović ◽  
Emir Turkušić
Keyword(s):  
Glassy Carbon ◽  
Electrochemical Determination ◽  
Screen Printed Electrodes ◽  
Screen Printed

scholarly journals Effi ciency of dye sensitized solar cells with various compositions of TiO2 based screen printed photoactive electrodes

2013 ◽  
Vol 6 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Pavol Gemeiner ◽  
Milan Mikula
Keyword(s):  
Ethyl Cellulose ◽  
Screen Printing ◽  
Dye Sensitized Solar Cells ◽  
Tio2 Electrode ◽  
Force Microscopy ◽  
Dye Sensitized ◽  
Atomic Force ◽  
Effi Ciency ◽  
Vis Spectroscopy ◽  
Screen Printed

Abstract The TiO2 electrode has a key role in dye sensitized solar cell (DSSC) technology in the charge generation and charge transportation. The properties of TiO2 layer affect resulting efficiency of DSSC and can be controlled by printing process and chemical composition of printing paste. TiO2 pastes with different compositions of TiO2 nanoparticles, ethanol, ethyl cellulose, water, acetic acid, α-terpineol were prepared and screen printed onto the glass substrate with fluorine doped tin oxide (FTO). The TiO2 pastes for screen printing were characterized by rheological measurements and screen printed TiO2 electrodes by atomic force microscopy and UV-Vis spectroscopy. The photocurrent - voltage characteristics and efficiencies of DSSC were evaluated and compared. All prepared TiO2 pastes were suitable for screen printing with ideal rheological characteristics. The highest efficiency 0.68 % and current density ISC = 1.21 mA/cm2 reached by the DSSC based on TiO2 electrode with thickness 1.5 μm, with amount of absorbed dye 1.1 × 10-8 mol/cm2 and without visible cracks and particles aggregation. This TiO2 electrode was prepared from the paste containing 5.4 wt. % of TiO2, 65.3 wt. % of ethanol, 1.8 wt. % of ethyl cellulose, 23 wt. % of H2O and 4.5 wt. % of CH3COOH.

scholarly journals Monitoring of the morphologic reconstruction of deposited ablation products in laser irradiation of silicon

2008 ◽  
Vol 40 (1) ◽  
pp. 69-78 ◽  
Author(s):  
M. Vlasova ◽  
Márquez Aguilar ◽  
M.C. Reséndiz-González ◽  
M. Kakazey ◽  
V. Stetsenko ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Heating Temperature ◽  
Composite Films ◽  
Target Surface ◽  
Oxygen Impurity ◽  
Irradiation Channel ◽  
Force Microscopy ◽  
Atomic Force ◽  
Gaseous Atmospheres ◽  
Main Components

Using electron microscopy, atomic force microscopy, X-ray microanalysis, and IR spectroscopy, it was established that, in the regime of continuous laser irradiation of silicon at P = 170 W in different gaseous atmospheres with an oxygen impurity, SiOx composite films with a complex morphology form. The main components of ablation products are clusters that form during flight of ablation products and as a result of separation of SiOx-clusters from the zone of the irradiation channel. The roughness and density of the films depend on the heating temperature of the target surface and the type of deposited clusters.

Polyoxometalate-like sub-nanometer molybdenum(vi)-oxo clusters for sensitive, selective and stable H2O2 sensing

2020 ◽  
Vol 56 (66) ◽  
pp. 9465-9468 ◽  
Author(s):  
Rongji Liu ◽  
Yuyang Luo ◽  
Yuanhao Zheng ◽  
Guangjin Zhang ◽  
Carsten Streb
Keyword(s):  
Glassy Carbon ◽  
Mesoporous Carbon ◽  
Screen Printed Electrodes ◽  
H2o2 Sensing ◽  
Screen Printed

Polyoxometalate-like sub-nanometer molybdenum(vi)-oxo clusters supported on mesoporous carbon are stably deposited on glassy carbon and screen-printed electrodes suitable for selective, sensitive and stable H2O2 sensing.

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