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Here, we examine the influence of surface chemical reactivity toward ambient gases on the performance of nanodevices based on two-dimensional materials “beyond graphene” and novel topological phases of matter. While surface oxidation in ambient conditions was observed for silicene and phosphorene with subsequent reduction of the mobility of charge carriers, nanodevices with active channels of indium...
The design of a two dimensional material is performed using first principle calculations by utilizing Mg7 clusters in a periodic manner. In particular, placing the Mg7 clusters in a hexagonal shape enables the formation of two dimensional Mg7. Calculations reveal the formation of two dimensional Mg7 would occur in exothermic matter where the bond between each Mg7 is considered to be due to physisorption...
Two different pyrene-substituted ions were used to render the surface of graphene hydrophilic. Self-limiting monolayers of ammonium and sulfonate substituted pyrenes were used to give, respectively, an overall positive and negative charge to the surface. Both pyrenes gave a stable hydrophilic surface and were used to selectively immobilise negatively or positively charged macro-molecules. This simple...
Necessity of opening of energy gap in the band structure of, otherwise a zero gap semiconductor, graphene, is a must for its use in fabrication of high speed electronic devices. One such technique, for opening of energy gap in graphene, is by way of doping the pristine graphene with boron or nitrogen. Besides many important applications, to which B- and N-doped graphene has been put, the one very...
Three different graphite-based powders (expandable graphite and two different nano-graphite powders) were investigated as starting materials for an effective liquid phase exfoliation process in isopropyl alcohol (IPA). The prepared dispersions were analyzed and compared in terms of their graphene concentration, stability, number of graphene layers and quality, as well as the electrical conductivity...
The present work investigates the barrier protection mechanism of functionalised graphene when coated on mild steel substrate. Electrochemical parameters of the coating such as pore resistance, coating capacitance and water uptake characteristics were evaluated using electrochemical impedance spectroscopy. Additionally, breakpoint frequencies were deduced to evaluate the electrochemical activity at...
Graphene and its multifunctional derivatives may offer passive targeting toward tumor sites and could be designed as drug delivery systems. Surface modifications of graphene materials convey specific biological activity to themselves and improve their biocompatibility. Herein we report the conjugation of Silibinin, a flavonoid employed mainly as hepatoprotective and anticancer agent, to a graphene...
Voltage-induced graphene oxide (GO) reduction is a facile and environmentally benign procedure for removing oxygen-containing functional groups from GO and recovering electrical conductivity. In this work, we perform a comprehensive investigation of the reduction process, structure, and electrical properties associated with voltage-reduced graphene oxide (V-rGO), obtained by applying a voltage between...
The power of polymorphism in carbon is vividly manifested by the numerous applications of carbon-based nano-materials. Ranging from environmental issues to biomedical applications, it has the potential to address many of today’s dire problems. However, an understanding of the mechanism of transformation between carbon allotropes at a microscopic level is crucial for its development into highly desirable...
Hydrothermally reduced porous graphene (PGs) and polyaniline (PANI) nanofiber composites (PGs–PANI) were prepared by interfacial polymerization of aniline in the presence of reduced porous graphene (PGs) under acidic conditions. Hydrothermal reduction of graphene oxide (GO) produced graphene quantum dots (GQDs) along with porous reduced graphene (PGs). The removal of nano sized GQDs generate several...
The surfactant assisted exfoliation and non-covalent functionalization of two-dimensional layered materials, like graphene, transition metal dichalcogenides, etc., has extraordinarily been propelled forward within the last 5years. Numerous molecules have been designed and attached to the exfoliated layers, and based on their outstanding properties, perylene based dyes have become one of the most frequently...
We derive core-level spectra for doped free-standing bilayer graphene. Numerical results are presented for all nine combinations of the doping concentrations 1012cm-2,1013cm-2, and 1014cm-2 in the two graphene sheets and we compare the results to the reference spectra for monolayer graphene. We furthermore discuss the spectrum of single-particle inter-band and intra-band excitations in the ωq-plane,...
Molybdenum disulfide (MoS2) is a layered material with promising photo-electroactive properties with possible application in solar cell devices. In this work, exfoliated MoS2 (E-MoS2) was produced using a chemical intercalation and exfoliation process. After an exhaustive characterization of the material, two different solar cell arrays were studied for the photoanode using the synthetized exfoliated...
Two-dimensional (2D) materials such as graphene and transition metal chalcogenides (MX2, M: transition metal, X: S, Se, Te) have emerged as a new class of materials due to their high carrier mobility, high transparency, tunable band gap, low cost, and solution-processable properties. These materials can be fabricated into single layers or few layers through facile processes such as chemical vapor...
In the rapidly expanding field of two-dimensional (2D) materials, special attention is given to systems that can be stabilized as free-standing monolayers. Here we use density-functional theory calculations to show how a well-established synthesis route can prepare stable 2D sheets of P-based hydrides. In particular, we show that strongly exothermic topotactic reactions of suitable AlB2-like precursors...
Interest in two-dimensional (2D) materials is growing exponentially across various scientific and engineering disciplines owing to their fascinating electrical, optical, chemical, and thermal properties. As one of the newest members in the 2D nanomaterial family, black phosphorus (BP), has recently attracted much attention all over the world and shown great potential in novel nanoelectronics owing...
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