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Dry electrodes for impedimetric sensing of physiological parameters (such as ECG, EEG, and GSR) promise the ability for long duration monitoring. This paper describes the feasibility of a novel dry electrode interfacing using Patterned Vertical Carbon Nanotube (pvCNT) for physiological parameter sensing. The electrodes were fabricated on circular discs (ϕ = 10 mm) stainless steel substrate. Multiwalled...
The present work demonstrates the in vivo biocompatibility and operation of a biofuel cell enclosed by a chitosan membrane. The measured power output in the range of 6.2 to 20.7 µW cm−2 (applied current from 10 to 70 µA) indicated that glucose and oxygen can reach the enzymes in the 3D matrix without any need for a buffer solution in the implant or a hydration step. This is very important to simplify...
We report on the use of catechol for the electrochemical activation of acid-functionalised single-walled carbon nanotubes immobilised on glassy carbon electrodes. Following well-published methods for catechol activation of bare glassy carbon electrodes, these studies show the efficacy of extending the method to activation of carbon nanotubes. Voltammetric scans in catechol show an increase in current...
Direct electronic interfaces between biological systems and solid-state devices offer considerable advantages over traditional optical interfaces by reducing system costs and affording increased signal levels. Integrating sensor transduction onto a complementary metal-oxide-semiconductor (CMOS) chip provides further advantages by enabling reduction of parasitics and improved sensor density. We present...
This paper present a research on the realization of polymeric coatings based on CNT/CNF - electroactive polymer networks structures type 3D for supercapacitor purposes. This paper shows effective measurements and tests made in order to determine the quality of electrodes using cyclic voltammetry method to realize a deposion of a reactant on the graphite electrode and to see the relationship between...
In any electronic devices and sensors, internal strain is induced because of the thermal change or the lattice mismatch between different materials. It is, therefore, expected that when carbon nanotubes (CNTs) are used for electronic devices, their electronic properties are changed caused by the deformation. In this study, we study the mechanism of the change in the band gap of CNTs under the radial...
We report on the observation of the significant photocurrent response of a carbon nanotube (CNT) heterostructure device illuminated by continuous-wave terahertz (THz) radiation. The device consists of a double-walled CNT macrobundle contacted with two metallic nickel electrodes. A room-temperature current responsivity up to ∼0.3 mA/W was obtained when THz radiation was incident on the position of...
High sensitive sensors are one of the goals of the modern society due to an increasing necessity for real-time monitoring. To achieve this, new devices and materials are being developed nowadays. In particular, electroacoustic resonators have gained importance in the chemical and biological sensors field owing to their promising performances. Although important advances have been made in the electroacoustic...
We report on the morphological, electrical and optical characteristics of Carbon nanotube (CNT) films on different transparent substrates, obtained using spray deposition. The effect of different substrate materials on the characteristics of spayed CNT films with varying thickness is investigated. While film morphology is shown to depend on the underlying surface characteristics, no significant changes...
In this paper, lightweight heat sinks based on carbon nanotubes (CNTs) are presented. CNTs were attached on the surface of silicon chips and their heat dissipation performance were monitored. As the morphology of heat sinks is an important factor for the heat dissipation efficiency, two types of CNTs, CNT arrays and sponge CNTs, were used here. Besides, the influence of airflow on the two kinds of...
Being direct band-gap materials, carbon nanotubes (CNTs) have a potential to be efficient optoelectronic detection material. In order to explore this potential application, a CNTs-based device is fabricated with micromachined techniques and depositing the CNTs on the substrate surface with CVD growth methods. The structure of the CNTs-based device is characterized with SEM picture. Normally CNTs forms...
Supercellulose gel and single-wall carbon nanotubes (SWCNTs) were used for the creation of binder-free electrode for supercapacitor application and the properties of the electrode were investigated in aqueous electrolyte. Two layers of the formed composite material were inserted on graphite current collectors and separated from each other by a separator to create a supercapacitor prototype for measurements...
Dielectrophoresis (DEP) is one of the most popular methods for fabricating devices based on nanotubes and nanowires. During a typical dielectrophoretic deposition experiment, several forces other than the DEP force itself could play important roles; however, their effects have often been neglected. Here, a particle tracing approach is used to follow the path of carbon nanotubes (CNTs) from suspension...
We propose a method to calculate the output current-voltage characteristics of a light induced thermionic emission device. This approach improves on the existing methods by having both a higher precision and higher range in evaluating the associated integrals, resulting in simulated device characteristics with a wider range of parameters. This method represents a significant step towards the characterization...
Controllable electrical breakdown of multiwall nanotubes (MWNTs) is studied utilizing the atomic force microscopy (AFM). Electrical breakdown has been known as the way to fundamentally understand the electrical properties of nanotubes and an approach to develop MWNT based transistors and sensors. Normally, electrical breakdown was known to be happened in the center of MWNT because of the thermal accumulation...
Carbon nanotube networks are compatible with silicon and possess features of light modulation, detection and emission in the transparency band of silicon. This makes them excellent candidates as active material for silicon photonics. However, the ubiquitous presence of residual metallic nanotubes in nanotube networks is a strong issue for this vision. In this work, we perform Monte Carlo simulations...
CNT (Carbon Nanotube) based memory (NRAM) demonstrates a beneficial scaling effect related to the patterned area of the CNT region, such that the scaled feature shows an improvement in ON/OFF resistance ratio (to ~10,000x and improved data retention relative to the original feature dimensions.
In this paper, lightweight heat sinks based on carbon nanotubes (CNTs) are presented. CNTs were attached on the surface of silicon chips and their heat dissipation performance were monitored. As the morphology of heat sinks is an important factor for the heat dissipation efficiency, two types of CNTs, CNT arrays and sponge CNTs, were used here. Besides, the influence of airflow on the two kinds of...
Characterization method for active layers for microelectrodes of electrochemical and gas sensors using scanning electron microscopy (SEM) is presented. In order to achieve maximum sensitivity and selectivity of the sensor, it is necessary to obtain precise knowledge of electrode's surface. Characterization was made using FEI Magellan SEM equipped with TLD secondary electron (SE) and CBS back-scattered...
A sensitive and label-free electrochemical immunosensor has been designed using chitosan (CHI)-carbon nano tubes (SWCNT) nano composite coated graphite electrodes for lung cancer detection using anti-hTERT for detection of hTERT biomarker (expressed in state of initial lung cancer progression). Computer interfacing technologies are now essentially desired to integrate diagnosis systems so as to progress...
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