Synthesis of silicon carbide nanomaterials by microwave heating: Effect of types of carbon nanotubes

One-dimensional silicon carbide nanomaterial (SiCNM) is the leading potential material for high temperature, high power and harsh environment components and devices. This is due to the outstanding properties of the one-dimensional SiCNMs such as high mechanical properties, high hardness, good chemical inertness and excellent electronic properties. In this paper, we reported the successful synthesis of one-dimensional SiCNMs from blend of SiO2 particles with two types of CNTs, namely MWCNTs and SWCNTs by using microwave heating and the effect of types of CNTs on the synthesis of one-dimensional SiCNMs. The result of x-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive x-ray spectroscopy, photoluminescence spectroscopy, Fourier transform infrared spectroscopy and thermo-gravimetric analysis revealed that high purity of β-SiC nanotube was obtained from blend of SiO2 particles and MWCNTs while solid SiC nanowire was synthesized from blend of SiO2 particles and SWCNTs and associated with the presence of residual of unreacted SiO2 particles. This clearly shows that types of one dimensional SiCNMs (hollow or solid) can be controlled by using different types of CNTs and thus this study proposed a high efficiency microwave heating method for the synthesis of one-dimensional SiCNMs with controllable morphology. © 2019 Elsevier Masson SA

Aptamer-based impedimetric determination of the human blood clotting factor IX in serum using an interdigitated electrode modified with a ZnO nanolayer

This article describes a sensitive impedimetric method for the determination of human blood coagulation factor IX protein (FIX) which is present in extremely low concentration in serum. An interdigitated electrode (IDE) whose surface was layered with zinc oxide was modified with two kinds of probes. One is an antibody, the other an aptamer against FIX. A comparative study between anti-FIX aptamer and anti-FIX antibody showed the aptamer to possess higher affinity for FIX. A sandwich aptamer assay was worked out by using the FIX-binding aptamer on the surface of the IDE. It has a detection limit as low as 10 pM which makes it 4 to 30-fold more sensitive than any other method reported for FIX. Moreover, to practice detection in clinical samples, FIX was detected from the human blood serum by spiking. In our perception, the sensitivity of the ZnO-modified IDE presented here makes it a promising tool for sensing clinically relevant analytes that are present in very low (sub-pM) concentrations

Integration of microfluidic channel on electrochemical-based nanobiosensors for monoplex and multiplex analyses: An overview

Background Microfluidic devices have evolved into low-cost, simple, and powerful analytical tool platforms. Herein, an electrochemically-based microfluidic nanobiosensor array for monoplex and multiplex detection of physiologically relevant analytes is reviewed. Unlike other analyte detection methods, microfluidics-based embedded electrochemical nanobiosensors are portable, custom electrochemical readers for signal reading. Methods Microfluidic devices and electrochemical sensors can be integrated into monoplex or multiplex systems. The integrated system is simple to use and sensitive, and so has great potential as a powerful tool for profiling immune-mediated treatment responses in real time. It may also be developed further as a point-of-care diagnostic device for conducting near-patient tests using biological samples. Therefore, using mutiplex analysis, a biosensor array may detect multiple analytes in a sample solution and provide different outputs for each analyte. A microfluidic electrochemical nanobiosensor, for example, can detect urine glucose, lactate, and uric acid. The microfluidic array of integrated nanobiosensors and electrochemical sensors enables fast and cost-effective selection of high-quality and statistically significant diagnostic data at the point of care. The multiplex analytical test is an important molecular tool for academic research as well as clinical diagnosis. Although key approaches for analysing numerous analytes have been developed, none of them are suitable for point-of-care diagnostics, especially in situations with limited resources. Significant findings In this study, monoplex and multiplex microfluidic assays for rapid measurement of single and multiple analytes at the point of care are presented. Since this test can analyse both single and multiple analytes, it is exceptionally specific, easy to use, and inexpensive. The ability of integrated electrochemical-based microfluidic devices with single channel and multiple channels systems to perform monoplex and multiplex analysis simultaneously and independently is the novelty of this review

RF behavior of undoped channel ultra-thin body with ultra-thin BOX MOSFETs

RF performance of ultra-thin body with ultra-thin buried oxide (BOX), so-called UTBB, MOSFETs with gate length down to 30 nm is presented. Current gain cut-off frequency fT and maximum oscillation frequency fmax of 160 GHz and 143 GHz, respectively, are demonstrated. Based on an accurate extraction of the small-signal equivalent circuit of UTBB MOSFET over a wide frequency range, it is revealed that ground plane (GP) implementation (i.e. highly-doped region underneath the BOX)does not increase the high frequency parasitic capacitances, and thus does not degrade the RF performance of UTBB devices

On the gm/ID-based Threshold Voltage Extractions in Advanced SOI MOSFETs

In this work, using analytical modeling, simulations and experiments, we investigate the gm/ID-based methods for the threshold voltage extraction using two popular threshold voltage criteria applicable to advanced SOI MOSFETs, namely: the condition of the maximum of the second derivative of the inversion charge and of the equality of the drift and diffusion drain current components. Limitations and practical applicability of these methods are discussed

Effect of parasitic elements on UTBB FD SOI MOSFET RF figures of merit

This work details the harmful effect of parasitic resistances and capacitances on RF figures of merit (FoM) of ultra-thin body and thin buried oxide (UTBB) FD SOI n-MOSFETs. It is demonstrated that UTBB device intrinsically can reach significantly high fT provided the reduction of parasitic elements

UTBB SOI MOSFETs analog figures of merit: effect of ground plane and asymmetric double-gate regime

In this work, we experimentally investigate the effect of ground plane (GP) on analog figures of merit (FoM) of ultra-thin body and thin buried oxide (UTBB) SOI MOSFETs. Both n- and p-type GP configurations are considered. Next, we demonstrate that application of asymmetric double-gate regime allows for the improvement of analog FoM in UTBB SOI MOSFETs with GP