scholarly journals Light-Addressable Electrochemical Sensing of Dopamine Using on N-Silicon/gold Schottky Junctions

2019 ◽  
Author(s):  
Irina Terrero Rodriguez ◽  
Alexandra J. Borrill ◽  
Glen O'Neil
Keyword(s):  
Au Nanoparticles ◽  
Electrochemical Sensors ◽  
Aqueous Electrolyte ◽  
Potassium Ferrocyanide ◽  
Electrochemical Sensing ◽  
Schottky Junction ◽  
Au Nps ◽  
Virtual Array ◽  
Schottky Junctions ◽  
Local Illumination

Here, we report the use of semiconductor/metal (Schottky) junctions as light-addressable electrochemical sensors (LAES). We employ an n-Si/Au Schottky junction prepared by electrodeposition of Au nanoparticles (NPs) on a freshly etched n-Si photoelectrode. The sensors demonstrate near reversible electrochemical behavior for the oxidation of ferrocene methanol and potassium ferrocyanide. Moreover, n-Si/Au LAES were stable for 1000 cyclic voltammetry cycles in an aqueous electrolyte – even though the n-Si surface was only partially covered with Au NPs. We also challenged the LAES to detect the neurotransmitter dopamine and found that the sensors were quantitative over the range from 15-500 µM in buffer. We used local illumination to generate a virtual array of electrochemical sensors for dopamine as a strategy for circumventing sensor fouling.

scholarly journals Light-Addressable Electrochemical Sensing of Dopamine Using on N-Silicon/gold Schottky Junctions

2019 ◽  
Author(s):  
Irina Terrero Rodriguez ◽  
Alexandra J. Borrill ◽  
Glen O'Neil
Keyword(s):  
Au Nanoparticles ◽  
Electrochemical Sensors ◽  
Aqueous Electrolyte ◽  
Potassium Ferrocyanide ◽  
Electrochemical Sensing ◽  
Schottky Junction ◽  
Au Nps ◽  
Virtual Array ◽  
Schottky Junctions ◽  
Local Illumination

Here, we report the use of semiconductor/metal (Schottky) junctions as light-addressable electrochemical sensors (LAES). We employ an n-Si/Au Schottky junction prepared by electrodeposition of Au nanoparticles (NPs) on a freshly etched n-Si photoelectrode. The sensors demonstrate near reversible electrochemical behavior for the oxidation of ferrocene methanol and potassium ferrocyanide. Moreover, n-Si/Au LAES were stable for 1000 cyclic voltammetry cycles in an aqueous electrolyte – even though the n-Si surface was only partially covered with Au NPs. We also challenged the LAES to detect the neurotransmitter dopamine and found that the sensors were quantitative over the range from 15-500 µM in buffer. We used local illumination to generate a virtual array of electrochemical sensors for dopamine as a strategy for circumventing sensor fouling.

Au nanoparticles supported on functionalized two-dimensional titanium carbide for the sensitive detection of nitrite

2019 ◽  
Vol 43 (6) ◽  
pp. 2464-2470 ◽  
Author(s):  
Huiyan Zou ◽  
Feifei Zhang ◽  
Haiyan Wang ◽  
Jianfei Xia ◽  
Linna Gao ◽  
...  
Keyword(s):  
Titanium Carbide ◽  
Au Nanoparticles ◽  
Electrochemical Sensing ◽  
Sensitive Detection ◽  
Two Dimensional ◽  
Au Nps ◽  
Sensing Platform

A novel electrochemical sensing platform based on a Au NPs/Ti3C2TX composite was constructed.

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 Fabrication and Application of SERS-Active Cellulose Fibers Regenerated from Waste Resource

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2142
Author(s):  
Shengjun Wang ◽  
Jiaqi Guo ◽  
Yibo Ma ◽  
Alan X. Wang ◽  
Xianming Kong ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Regenerated Cellulose ◽  
Sers Substrate ◽  
Au Nps ◽  
Convenient Approach ◽  
Theoretical Simulations ◽  
Difference Time ◽  
Raman Probe

The flexible SERS substrate were prepared base on regenerated cellulose fibers, in which the Au nanoparticles were controllably assembled on fiber through electrostatic interaction. The cellulose fiber was regenerated from waste paper through the dry-jet wet spinning method, an eco-friendly and convenient approach by using ionic liquid. The Au NPs could be controllably distributed on the surface of fiber by adjusting the conditions during the process of assembling. Finite-difference time-domain theoretical simulations verified the intense local electromagnetic fields of plasmonic composites. The flexible SERS fibers show excellent SERS sensitivity and adsorption capability. A typical Raman probe molecule, 4-Mercaptobenzoicacid (4-MBA), was used to verify the SERS cellulose fibers, the sensitivity could achieve to 10−9 M. The flexible SERS fibers were successfully used for identifying dimetridazole (DMZ) from aqueous solution. Furthermore, the flexible SERS fibers were used for detecting DMZ from the surface of fish by simply swabbing process. It is clear that the fabricated plasmonic composite can be applied for the identifying toxins and chemicals.

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.

A novel photoelectrode based on eosin Y–rhodamine B duo-dye sensitized Au nanoparticles by in situ reduction

2017 ◽  
Vol 9 (38) ◽  
pp. 5586-5592 ◽  
Author(s):  
Y. L. Yuan ◽  
G. M. Pang ◽  
X. K. Li ◽  
W. Y. Zhu ◽  
H. C. Pan
Keyword(s):  
Rhodamine B ◽  
Au Nanoparticles ◽  
Specific Response ◽  
Eosin Y ◽  
In Situ Reduction ◽  
Au Nps ◽  
Dye Sensitized ◽  
Novel Strategy

A novel strategy for the fabrication of a photoelectrochemical system, involving a duo-dye sensitized Au NPs composite, that displays a specific response to mercury.

scholarly journals An Electrochemical Sensor Based on Gold Nanodendrite/Surfactant Modified Electrode for Bisphenol A Detection

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Nguyen Thi Lien ◽  
Le Quoc Hung ◽  
Nguyen Tien Hoang ◽  
Vu Thi Thu ◽  
Dau Thi Ngoc Nga ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Electrochemical Sensors ◽  
Differential Pulse ◽  
Electrochemical Sensing ◽  
Fluorescence Measurements ◽  
Sensing Platform ◽  
Electrochemical Window ◽  
Galvanostatic Deposition ◽  
Bisphenol A Detection ◽  
Good Agreement

In the present work, we reported the simple way to fabricate an electrochemical sensing platform to detect Bisphenol A (BPA) using galvanostatic deposition of Au on a glassy carbon electrode covered by cetyltrimethylammonium bromide (CTAB). This material (CTAB) enhances the sensitivity of electrochemical sensors with respect to the detection of BPA. The electrochemical response of the modified GCE to BPA was investigated by cyclic voltammetry and differential pulse voltammetry. The results displayed a low detection limit (22 nm) and a linear range from 0.025 to 10 µm along side with high reproducibility (RSD = 4.9% for seven independent sensors). Importantly, the prepared sensors were selective enough against interferences with other pollutants in the same electrochemical window. Notably, the presented sensors have already proven their ability in detecting BPA in real plastic water drinking bottle samples with high accuracy (recovery range = 96.60%–102.82%) and it is in good agreement with fluorescence measurements.

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