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In this article, we report a Field Effect Transistor (FET) with Aluminum doped graphene channel. The graphene is doped by spin coating a chemical dopant solution which tailored the electrical properties of graphene, such as transfer characteristics and output characteristics. The Doping of graphene was successfully verified by X-Ray photoelectron spectra (XPS) measurements. The testing results showed...
The catalyst support layer is fabricated by applying a DC electrophoretic deposition on a colloid consisting of dispersed nanographitic flakes along with magnesium ions in isopropyl alcohol. The thickness and conductivity of the deposited layers are controlled by varying the time of the voltage application in the electrophoretic deposition EPD technique. The catalyst supports are decorated by sputtering...
Two-dimensional (2D) atomic crystals are considered to be very promising for nanoelectronics and spintronics applications. It provides a large class of materials proposed to be important for long distance spin transport, spin polarized tunneling and large spin-orbit coupling. Here I will discuss spintronic aspects of these 2D materials and their heterostructures. Graphene is considered to be an ideal...
Nano-optoelectronic sensors and devices bring tremendous revolutions in photoelectric conversion due to dimension reduced. The device geometry dominates the electron transport so that the spatially resolved optoelectronics properties are critical to characterize device performance. In this paper, it reports a two-photon pulsed laser scanning microscopy method which utilizes raster scan on device with...
Graphene's extraordinary electrical, electrochemical and structural property holds great promise for biological sensing applications. In most graphene based sensing studies, the changes in conductance are widely employed as a method for detection. Here, we propose the graphene thermoelectric property, such as the thermo power profile, can also be used for sensing purposes. We conducted a first principle...
Novel devices are desperately required for effective detection of bacteria because of its potential risks in the fields of food safety and public health. In this paper, we demonstrated graphene field-effect transistors (G-FETs) for Escherichia coli (E. coli) detection. Linker molecules and antibodies were employed to functionalize graphene. Raman spectroscopy and confocal microscopy were used to confirm...
We have performed a simplified numerical simulation of the transport properties of a graphene ribbon with an antidot lattice. We have used an envelope function model for graphene, in which a space-dependent mass term approximately reproduces the effect of the regions of the ribbon where the carbon atoms are absent. The envelope function equation has been solved in proper subregions of the ribbon and...
Polymer-composites based on polyvinylidene fluoride (PVDF) and reduced graphene oxide (RGO) have been fabricated from PVDF/GO membrane by a simple hot-molding technique. Several characterizations such as AFM, XRD, FT-IR and Raman have been employed to confirm thermal reduced process from GO to RGO in the composite. The enhanced dielectric properties were investigated. It turns out that the composites...
Preserved the exceptional properties of graphene, the graphene nanowall (GNW) with inter-networked vertically oriented three-dimensional graphene morphology possess superior potential in constructing advanced microsystems. In this paper, GNW thin film was synthesized through the microwave plasma-enhanced chemical vapor deposition method on SiO2/Si wafer and a spiral GNW microelectrode was further...
Time-controlled pulse plasma CVD has been developed aiming for the mass production of narrow chirality distributed single-walled carbon nanotubes (SWNTs). Through the comparison of continuous plasma CVD and pulse plasma CVD, it is found that the amount of SWNTs can be increased in keeping with the initial narrow chirality distribution by repeating pulse plasma CVD. The effects of pulse time parameter,...
We report the fabrication of graphene quantum dots on Cu substrates by thermal CVD. The synthesized high-density graphene quantum dots exhibit strong surface enhanced Raman scattering (SERS) effects. The nanoscale distance of 30∼50nm between neighboring quantum dots combined with quantum dots to form nanostructures favorable for plasmonic coupling enhanced high local electric fields, which lead to...
Graphene-based noble metal nanocomposites have attracted tremendous research interest in the fields of surface-enhanced Raman scattering (SERS) recently. However, efficient utilization as SERS substrates has been impeded by the difficulty of tuning SERS enhancement effects induced from chemical and plasmonic enhancement by different preparation methods of graphene. Herein, three kinds of graphene-based...
This study developed simple multiplex miRNA amplification and detection platform using the combination of RCA approach and fluorescence quenching property of reduced graphene oxide. miRNA 29 and miRNA 144*, which are short noncoding RNA (22 nt) found highly expressed in the blood circulation of tuberculosis patients, are chosen for the development model. Our combination approaches could detect miRNA...
Recent experimental efforts in investigating low-dimensional nanomaterials have spanned significantly beyond carbon nanotube (CNT) and graphene, which are often considered hallmarks of one- and two-dimensional (1&2D) nanostructures. Emerging layered nanomaterials, such as transition metal dichalcogenides (TMDC) and black phosphorus (P), have enabled new device functions and potential applications...
Remarkable optical and electrical properties of graphene and other two-dimensional (2D) materials provide significant potential for novel optoelectronic applications and devices, many of which depend on nonlinear optical effects in these 2D materials. In this paper we use a theoretical and computational formalism we have recently introduced to efficiently and accurately compute the linear and nonlinear...
The transport properties of back-gated graphene field effect transistors (GFETs) can be tuned via chemical doping. In this study, we report alteration of charge transport properties of GFET via 5-(4-hydroxyphenyl)-10,15,20-tri-(p-tolyl) zinc(II) porphyrin (Zn(II)-TTPOH) and its free base counterpart. We propose that, the porphyrin induces p - type doping in graphene.
In this work, we demonstrate a fast hydrothermal approach for the facile synthesis of graphene (GN) from reduction of graphene oxide (GO) in the presence of reducing agents (sodium hydroxide, NaOH). The obtained GN was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopic techniques (Raman) and thermogravimetric...
Pd is a unique substrate to explore graphene growth. Pd is a well-known “carbon sponge” which have potential to grow graphene with semiconducting properties in nature. Here, we reveal a solid phase reaction process to achieve Pd assisted graphene growth in nanoscale by in-situ transmission electron microscope (TEM). Significant structural transformation of amorphous carbon nanofiber (CNF) incorporated...
This study reports the laser direct writing of graphene oxide (GO) to form reduced graphene oxide (RGO)-GO-RGO interdigitated on-chip micro-supercapacitors (MSCs) by reducing GO to RGO. The resolution of the laser writing lines can be lowered to 10 µm, which is much lower than that formed by the CO2 pulse laser, suggesting the potential to fabricate much smaller MSCs in 10 µm scale. The micro-supercapacitor...
Graphene has already been verified to have potential applications in sensor development due to its unique properties, such as large specific surface area, high carrier mobility, conductivity and optical transparency. Here, we discuss our development of a micro bubble generator that could be used to generate and actuate micron-scale bubbles based on monolayer graphene made from chemical vapor deposition...
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