A noble gas sensor platform: linear dense assemblies of single-walled carbon nanotubes (LACNTs) in a multi-layered ceramic/metal electrode system (MLES)

2018 ◽  
Vol 6 (5) ◽  
pp. 972-979 ◽  
Author(s):  
Tae-Yeon Hwang ◽  
Yomin Choi ◽  
YoSeb Song ◽  
Nu Si A. Eom ◽  
Seil Kim ◽  
...  
Keyword(s):  
Noble Gas ◽  
Cost Effective ◽  
Hydrogen Sensor ◽  
Metal Electrode ◽  
Electrode System ◽  
Sensor Platform ◽  
Walled Carbon Nanotubes ◽  
Effective Hydrogen ◽  
Layered Ceramic ◽  
Pt Catalyzed

Monodispersed nano Pt catalyzed linear dense assembly of SWCNTs bundles on a noble multi-layered electrode system for cost-effective hydrogen sensor.

scholarly journals A Flexible Platform of Electrochemically Functionalized Carbon Nanotubes for NADH Sensors

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 518 ◽  
Author(s):  
Aranzazu Heras ◽  
Fabio Vulcano ◽  
Jesus Garoz-Ruiz ◽  
Nicola Porcelli ◽  
Fabio Terzi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Direct Evidence ◽  
Electrode System ◽  
Electrochemical Process ◽  
Organic Residues ◽  
Flexible Electrode ◽  
Functionalized Carbon Nanotubes ◽  
Solution Interface ◽  
Sensor Platform ◽  
Walled Carbon Nanotubes

A flexible electrode system entirely constituted by single-walled carbon nanotubes (SWCNTs) has been proposed as the sensor platform for β-nicotinamide adenine dinucleotide (NADH) detection. The performance of the device, in terms of potential at which the electrochemical process takes place, significantly improves by electrochemical functionalization of the carbon-based material with a molecule possessing an o-hydroquinone residue, namely caffeic acid. Both the processes of SWCNT functionalization and NADH detection have been studied by combining electrochemical and spectroelectrochemical experiments, in order to achieve direct evidence of the electrode modification by the organic residues and to study the electrocatalytic activity of the resulting material in respect to functional groups present at the electrode/solution interface. Electrochemical measurements performed at the fixed potential of +0.30 V let us envision the possible use of the device as an amperometric sensor for NADH detection. Spectroelectrochemistry also demonstrates the effectiveness of the device in acting as a voltabsorptometric sensor for the detection of this same analyte by exploiting this different transduction mechanism, potentially less prone to the possible presence of interfering species.

B- and P-Doped Si0.8Ge0.2 Thin Film Deposited by Helicon Sputtering for the Micro-Thermoelectric Gas Sensor

2006 ◽  
Vol 320 ◽  
pp. 99-102 ◽  
Author(s):  
Kazuki Tajima ◽  
Woosuck Shin ◽  
Maiko Nishibori ◽  
Norimitsu Murayama ◽  
Toshio Itoh ◽  
...  
Keyword(s):  
Thin Film ◽  
Hydrogen Oxidation ◽  
Exothermic Reaction ◽  
High Sensitivity ◽  
Hydrogen Sensor ◽  
Thermoelectric Effect ◽  
Boron Doped ◽  
Reliable Monitoring ◽  
Ppm Level ◽  
Pt Catalyzed

Micro-thermoelectric hydrogen sensor (micro-THS) with the combination of the thermoelectric effect of Si0.8Ge0.2 thin film and the Pt-catalyzed exothermic reaction of hydrogen oxidation was prepared by microfabrication process. In the viewpoint of high sensitivity of micro-THS, the thermoelectric properties of the Si0.8Ge0.2 thin film could be improved by optimizing carrier concentration using helicon sputtering with an advantage of easy doping control, and sensitivity of the device with this thin film was investigated. As the result, the boron-doped Si0.8Ge0.2 thin film is considered to be the better choice ensuring the reliable monitoring of hydrogen concentration down to ppm level.

Pd/AlN/Si or SiC Structure for Hydrogen Sensing Device

2000 ◽  
Vol 622 ◽  
Author(s):  
Flaminia Serina ◽  
C. Huang ◽  
G. W. Auner ◽  
R. Naik ◽  
S. Ng ◽  
...  
Keyword(s):  
Molecular Beam ◽  
Hydrogen Sensor ◽  
Plasma Source ◽  
Metal Electrode ◽  
Pressure Effects ◽  
Mis Structure ◽  
Hydrocarbon Gases ◽  
Hydrogen Sensing ◽  
Design Structure ◽  
Aln Film

ABSTRACTAn AlN (insulator) MIS Hydrogen Sensor was created using plasma source molecular beam epitaxy (PSMBE) deposition on Si (111) and 6H-SiC. A Pd layer was deposited on top of the AlN film via magnetron sputtering technique utilizing a hard mask. Pd was chosen since H2 readily diffuses within its bulk, thus Pd acts not only as a metal electrode of the MIS structure, but also as a catalyst for hydrogen dissociation. To optimize the design structure several sensors with different AlN and Pd thickness have been developed. RHEED and XRD measurements show that AlN film is epitaxial on both Si (111) and 6H-SiC substrates. The sensors were characterized using capacitance versus voltage C(V) and I(V) measurements, at different frequencies ranging from 1kHz to 1 MHz. Shifts in the C-V and I-V curves occurred with the introduction of hydrogen in the chamber. The temperature, hydrogen partial pressure, effects of oxygen and hydrocarbon gases, insulator and metal thicknesses on sensor response were analyzed.

Conducting Properties of a Contact Between Open-End Carbon Nanotube and Various Electrodes

2009 ◽  
Author(s):  
Feng Gao ◽  
Jianmin Qu ◽  
Matthew Yao
Keyword(s):  
Electronic Structure ◽  
Carbon Nanotube ◽  
Density Functional ◽  
Low Voltage ◽  
Local Density ◽  
Electrical Contact ◽  
Metal Electrode ◽  
Electrode System ◽  
Voltage Bias ◽  
Electronic Conductance

The carbon nanotube (CNT) is becoming a promising candidate as electrical interconnects in nanoscale electronics. This paper reports the electronic structure and the electrical conducting properties at the interface between an open-end single wall CNT (SWCNT) and various metal electrodes, such as Al, Au, Cu, and Pd. A simulation cell consisting of an SWCNT with each end connected to the metal electrode was constructed. A voltage bias is prescribed between the left- and right-electrodes to compute the electronic conductance. Due to the electronic structure, the electron density and local density of states (LDOS) are calculated to reveal the interaction behavior at the interfaces. The first-principle quantum mechanical density functional and non-equilibrium Green’s function (NEGF) approaches are adopted to compute the transport coefficient. After that, the voltage-current relation is calculated using the Landauer-Buttiker formalism. The results show that electrons are conducted through the electrode/CNT/electrode two-probe system. The contact electronic resistance is calculated by averaging the values in the low voltage bias regime (0.0–0.1 V), in which the voltage–current relationship is found to be linear. And the electrical contact conductance of electrode/CNT/electrode system show the electrode-type dependent, however, the amplitude for different electrodes is of the same order.

scholarly journals Two Electrode ECG And EOG System For Monitoring Applications

2019 ◽  
Vol 8 (11) ◽  
pp. 262-265
Keyword(s):  
Reference Electrode ◽  
Cost Effective ◽  
Electrode System ◽  
Ecg Signal ◽  
Biomedical Signal ◽  
Ecg Signals ◽  
Arm Position ◽  
The Stability ◽  
Electrocardiogram Ecg ◽  
Total Gain

Heart and Eye are two vital organs in the human system. By knowing the Electrocardiogram (ECG) and Electro-oculogram (EOG), one will be able to tell the stability of the heart and eye respectively. In this project, we have developed a circuit to pick the ECG and EOG signal using two wet electrodes. Here no reference electrode is used. EOG and ECG signals have been acquired from ten healthy subjects. The ECG signal is obtained from two positions, namely wrist and arm position respectively. The picked-up biomedical signal is recorded and heart rate information is extracted from ECG signal using the biomedical workbench. The result found to be promising and acquired stable EOG and ECG signal from the subjects. The total gain required for the arm position is higher than the wrist position for the ECG signal. The total gain necessary for the EOG signal is higher than the ECG signal since the ECG signal is in the range of millivolts whereas EOG signal in the range of microvolts. This two-electrode system is stable, cost-effective and portable while still maintaining high common-mode rejection ratio (CMRR).

scholarly journals A ruthenium-based catalyst on carbon electrodes for electrochemical water splitting

2021 ◽  
Author(s):  
Lin Li ◽  
Biswanath Das ◽  
Ahibur Rahaman ◽  
Andrey Shatskiy ◽  
Fei Ye ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
State Of The Art ◽  
Cost Effective ◽  
Molecular Catalyst ◽  
Electrolysis Cells ◽  
Multi Walled Carbon Nanotubes ◽  
Energy Economy ◽  
Electrochemical Water Splitting ◽  
Walled Carbon Nanotubes

Electrochemical water splitting constitutes one of the most promising strategies for converting water into hydrogen-based fuels, and this technology is predicted to play a key role in our transition towards a carbon-neutral energy economy. To enable the design of cost-effective electrolysis cells based on this technology, new and more efficient anodes with augmented water splitting activity and stability will be required. Herein, we report an active molecular Ru-based catalyst for electrochemically-driven water oxidation and two simple methods for preparing anodes by attaching this catalyst onto multi-walled carbon nanotubes. The anodes modified with the molecular catalyst were characterized by a broad toolbox of microscopy and spectroscope techniques, and interestingly no RuO2 formation was detected during electrocatalysis over 4 h. These results demonstrate that the herein presented strategy can be used to prepare anodes that rival the performance of state-of-the-art metal oxide anodes.

Development of Synergistic Opto-Electronic Sensing Platform based on Zinc Oxide Semiconducting Nanostructures

2012 ◽  
Vol 2012 (1) ◽  
pp. 001191-001196
Author(s):  
Anurag Gupta ◽  
Bruce C. Kim ◽  
Mitchell Spryn ◽  
Eugene Edwards ◽  
Christina Brantley ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Cost Effective ◽  
Zinc Oxide Nanowires ◽  
Oxide Nanowires ◽  
Sensing Platform ◽  
Sensor Platform ◽  
Semiconducting Nanostructures ◽  
Ft Ir ◽  
Characterization Studies ◽  
Electronic Sensing

Potential of zinc oxide nanowires for developing a sensitive opto-electronic platform was demonstrated. Zinc oxide nanowires synthesized on insulating sapphire substrates were functionalized with an optically active receptor, 1-pyrenebutyric acid. Appropriate characterization studies including XPS and FT-IR ATR are reported. I-V curves of pristine and receptor-modified nanowires were utilized to highlight the potential of zinc oxide nano-heterostructures for developing a sensitive opto-electronic platform for p-nitrophenol sensing. Packaging issues for achieving an efficient and cost-effective sensor platform have also been outlined.

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