scholarly journals Electrochemical Deposition of Nanomaterials for Electrochemical Sensing

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1186 ◽  
Author(s):  
Domenica Tonelli ◽  
Erika Scavetta ◽  
Isacco Gualandi
Keyword(s):  
Electrochemical Sensors ◽  
Electrochemical Sensing ◽  
Applied Potential ◽  
Potential Constant ◽  
Synthesis Conditions ◽  
Figures Of Merit ◽  
Electrochemical Approach ◽  
Double Hydroxides ◽  
Analytical Figures Of Merit ◽  
Shape And Size

The most commonly used methods to electrodeposit nanomaterials on conductive supports or to obtain electrosynthesis nanomaterials are described. Au, layered double hydroxides (LDHs), metal oxides, and polymers are the classes of compounds taken into account. The electrochemical approach for the synthesis allows one to obtain nanostructures with well-defined morphologies, even without the use of a template, and of variable sizes simply by controlling the experimental synthesis conditions. In fact, parameters such as current density, applied potential (constant, pulsed or ramp) and duration of the synthesis play a key role in determining the shape and size of the resulting nanostructures. This review aims to describe the most recent applications in the field of electrochemical sensors of the considered nanomaterials and special attention is devoted to the analytical figures of merit of the devices.

scholarly journals Utilising Commercially Fabricated Printed Circuit Boards as an Electrochemical Biosensing Platform

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 793
Author(s):  
Uroš Zupančič ◽  
Joshua Rainbow ◽  
Pedro Estrela ◽  
Despina Moschou
Keyword(s):  
Printed Circuit Boards ◽  
Electrochemical Sensors ◽  
Cost Effective ◽  
Electrochemical Sensing ◽  
Label Free ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Sensing Applications ◽  
Electrochemical Biosensing ◽  
Pre Treatment

Printed circuit boards (PCBs) offer a promising platform for the development of electronics-assisted biomedical diagnostic sensors and microsystems. The long-standing industrial basis offers distinctive advantages for cost-effective, reproducible, and easily integrated sample-in-answer-out diagnostic microsystems. Nonetheless, the commercial techniques used in the fabrication of PCBs produce various contaminants potentially degrading severely their stability and repeatability in electrochemical sensing applications. Herein, we analyse for the first time such critical technological considerations, allowing the exploitation of commercial PCB platforms as reliable electrochemical sensing platforms. The presented electrochemical and physical characterisation data reveal clear evidence of both organic and inorganic sensing electrode surface contaminants, which can be removed using various pre-cleaning techniques. We demonstrate that, following such pre-treatment rules, PCB-based electrodes can be reliably fabricated for sensitive electrochemical biosensors. Herein, we demonstrate the applicability of the methodology both for labelled protein (procalcitonin) and label-free nucleic acid (E. coli-specific DNA) biomarker quantification, with observed limits of detection (LoD) of 2 pM and 110 pM, respectively. The proposed optimisation of surface pre-treatment is critical in the development of robust and sensitive PCB-based electrochemical sensors for both clinical and environmental diagnostics and monitoring applications.

scholarly journals Molecularly Imprinted Polymers Combined with Electrochemical Sensors for Food Contaminants Analysis

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4607
Author(s):  
Dounia Elfadil ◽  
Abderrahman Lamaoui ◽  
Flavio Della Pelle ◽  
Aziz Amine ◽  
Dario Compagnone
Keyword(s):  
Food Safety ◽  
Molecularly Imprinted Polymers ◽  
Electrochemical Sensors ◽  
Low Cost ◽  
Electrochemical Analysis ◽  
Ease Of Use ◽  
Electrochemical Sensing ◽  
Food Contaminants ◽  
Molecularly Imprinted ◽  
Imprinted Polymers

Detection of relevant contaminants using screening approaches is a key issue to ensure food safety and respect for the regulatory limits established. Electrochemical sensors present several advantages such as rapidity; ease of use; possibility of on-site analysis and low cost. The lack of selectivity for electrochemical sensors working in complex samples as food may be overcome by coupling them with molecularly imprinted polymers (MIPs). MIPs are synthetic materials that mimic biological receptors and are produced by the polymerization of functional monomers in presence of a target analyte. This paper critically reviews and discusses the recent progress in MIP-based electrochemical sensors for food safety. A brief introduction on MIPs and electrochemical sensors is given; followed by a discussion of the recent achievements for various MIPs-based electrochemical sensors for food contaminants analysis. Both electropolymerization and chemical synthesis of MIP-based electrochemical sensing are discussed as well as the relevant applications of MIPs used in sample preparation and then coupled to electrochemical analysis. Future perspectives and challenges have been eventually given.

scholarly journals Fundamentals, achievements and challenges in the electrochemical sensing of pathogens

The Analyst ◽  
2015 ◽  
Vol 140 (21) ◽  
pp. 7116-7128 ◽  
Author(s):  
Javier Monzó ◽  
Ignacio Insua ◽  
Francisco Fernandez-Trillo ◽  
Paramaconi Rodriguez
Keyword(s):  
Electrochemical Sensors ◽  
Electrochemical Sensing ◽  
Medical Applications

Electrochemical sensors are powerful tools widely used in industrial, environmental and medical applications.

Development of Au-Pd@UiO-66-on-ZIF-L/CC as a self-supported electrochemical sensor for in situ monitoring of cellular hydrogen peroxide

2021 ◽  
Author(s):  
Jilin Zheng ◽  
Peng Zhao ◽  
Shiying Zhou ◽  
Sha Chen ◽  
Yi Liang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Sensor ◽  
Noble Metals ◽  
Electrochemical Sensors ◽  
Metal Organic Frameworks ◽  
Electrochemical Sensing ◽  
In Situ Monitoring ◽  
Metal Organic

Integrating metal-organic frameworks (MOFs) of different components or structures together and exploiting them as electrochemical sensors for electrochemical sensing have aroused great interest. And the incorporation of noble metals with...

Nanowire Modification to Enhance the Performance of Neurotransmitter Sensors

2010 ◽  
Vol 1 (4) ◽  
Author(s):  
Hung Cao ◽  
J.-C. Chiao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electrochemical Sensors ◽  
Electrochemical Sensing ◽  
Human Central Nervous System ◽  
Excitatory Neurotransmitter ◽  
Modification Method ◽  
Solid Liquid ◽  
Scanning Electron ◽  
Si Wafer

In this work, we have developed a method to modify the platinum (Pt) working electrode with nanowires using vapor-solid-liquid (VLS) mechanism in order to increase the sensitivity of our microelectrochemical neurotransmitter sensors. Our sensor probes were manufactured from a 300 μm thick silicon (Si) wafer with several electrode designs for implantation in various locations of the human central nervous system. The surfaces of electrodes were observed and characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV). The complete devices were made and used to demonstrate the enhancement in performance contributed by nanowires in the enzyme-based electrochemical sensing of L-glutamate, which is the most abundant excitatory neurotransmitter. Comparison between electrodes with and without nanowire modification was conducted, showing that the modification method is a good option to improve the performance of electrochemical sensors.

Room-Temperature Luminescence of a Variety of Compounds on 1% α-Cyclodextrin/NaCl Mixture

1989 ◽  
Vol 43 (5) ◽  
pp. 810-812 ◽  
Author(s):  
Marsha D. Richmond ◽  
Robert J. Hurtubise
Keyword(s):  
Solid Surface ◽  
Room Temperature ◽  
Lower Cost ◽  
Model Compounds ◽  
Figures Of Merit ◽  
Room Temperature Luminescence ◽  
Analytical Figures Of Merit

With the use of model compounds of widely different functionality, it was found that a 1% α-cyclodextrin/NaCl mixture could be used in place of an 80% α-cyclodextrin/NaCl mixture to obtain solid surface room-temperature fluorescence (RTF) and phosphorescence (RTP) data. Analytical figures of merit are reported for four compounds. The use of a smaller percentage of α-cyclodextrin results in lower cost; no loss of analytical integrity, compared with that for an 80% α-cyclodextrin/NaCl mixture; and easier handling of the α-cyclodextrin/NaCl mixtures.

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