Synthesis Of Nanoribbons Research Articles

Green synthesis of silver nanoribbons from waste X-ray films using alkaline protease

Green synthesis of silver nanoribbons from waste X-ray films using alkaline protease

High-yield synthesis of gold nanoribbons by using binary surfactants

Gold nanoribbons with high morphological yield and great SERS performance have been successfully prepared by using binary surfactants.

Synthesis of Y‐Tip Graphitic Nanoribbons from Alcohol Catalytic Chemical Vapor Deposition on Piezoelectric Substrate

We report the synthesis of Graphitic Nanoribbons (GNRs) using Alcohol Catalytic Chemical Vapor Deposition (ACCVD). Bulk GNR was synthesized directly on a piezoelectric substrate using one‐step ACCVD. The synthesized GNRs were characterized by X‐Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Energy Dispersive X‐Ray (EDX), Atomic Force Microscopy (AFM), and Raman spectroscopy. The characterization results showed Y‐tip morphology of bulk and filamentous as‐grown GNR having varying width that lies between tens and hundreds of nm and length of several microns. Based on the thickness obtained from the AFM and the analysis from the Raman spectroscopy, it was concluded that the synthesized GNRs are multiple‐layered and graphitic in nature. With the direct synthesis of GNR on a piezoelectric substrate, it could have applications in the sensor industries, while the Y‐tip GNR could have potentialities in semiconductor applications.

Hydrothermal synthesis and characterization of HgTe nanoribbons from [Hg(Salen)] as mercury source

In this paper, synthesis and characterization of HgTe nanoribbons via hydrothermal method is reported using inorganic precursor, [Hg(Salen)] (H2Salen=N,N′-bis-salicylidene-1,2-ethylendiamine) as a mercury source. Besides, the effect of various reaction factors is studied and the role of reducing agent on morphology and phase of the products is presented with a mechanistic point of view. The prepared HgTe nanoribbons were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform Infrared (FT-IR) spectra, ultraviolet–visible (UV–vis) spectroscopy, and energy dispersive X-ray (EDX).

Scaled synthesis of boron nitride nanotubes, nanoribbons, and nanococoons using direct feedstock injection into an extended-pressure, inductively-coupled thermal plasma.

A variable pressure (up to 10 atm) powder/gas/liquid injection inductively coupled plasma system has been developed and used to produce high-quality boron nitride nanotubes (BNNTs) at continuous production rates of 35 g/h. Under suitable conditions, collapsed BN nanotubes (i.e., nanoribbons), and closed shell BN capsules (i.e., nanococoons) are also obtained. The process is adaptable to a large variety of feedstock materials.

Synthesis and characterization of tungstite (WO3·H2O) nanoleaves and nanoribbons

An environmentally benign method capable of producing large quantities of materials was used to synthesize tungstite (WO3·H2O) leaf-shaped nanoplatelets (LNPs) and nanoribbons (NRs). These materials were simply obtained by the aging of colloidal solutions prepared by adding hydrochloric acid (HCl) to dilute sodium tungstate solutions (Na2WO4·2H2O) at a temperature of 5–10°C. The aging medium and the pH of the precursor solutions were also investigated. Crystallization and growth occurred by Ostwald ripening during the aging of the colloidal solutions at ambient temperature for 24–48h. When dispersed in water, the LNPs and NRs take many days to settle, which is a clear advantage for some applications (e.g., photocatalysis). The materials were characterized using scanning and transmission electron microscopy, Raman and ultraviolet/visible spectroscopies. The current vs. voltage characteristics of the tungstite NRs showed that the material behaved as a Schottky diode with a breakdown electric field of 3.0×105Vm−1. They can also be heat-treated at relatively low temperatures (300°C) to form tungsten oxide (WO3) NRs and can be used as photoanodes for photoelectrochemical water splitting.

One-pot synthesis of carbon nanoribbons and their enhanced lithium storage performance

The manuscript reports a new one-pot synthesis of carbon nanoribbons with enhanced lithium storage performances for lithium ion batteries.

Geometric nonlinearity and mechanical anisotropy in strained helical nanoribbons.

Fabrication and synthesis of helical nanoribbons have received increasing attention because of the broad applications of helical nanostructures in nano-elecromechanical/micro-electromechanical systems (NEMS/MEMS), sensors, active materials, drug delivery, etc. In this paper, I study the mechanical principles used in designing strained helical nanoribbons, and propose the use of a full three-dimensional finite element method to simulate the coexistence of both left- and right-handed segments in the same strained nanoribbon. This work can both help understand the large deformation behaviours of such nanostructures and assist in the design of helical nanostructures for engineering applications.

Design and Synthesis of High Performance Multifunctional Ultrathin Hematite Nanoribbons

1D porous ultrathin nanoribbons of hematite (α-Fe2O3) were prepared by controlled annealing of different oxides and hydroxides of iron obtained from a solvothermal synthesis method. It is found that calcination at a temperature of 500 °C for 150 min decomposes these iron hydroxides into their most stable oxide form, i.e., α-Fe2O3. Driven by different attractive forces, these porous α-Fe2O3 nanoparticles get aggregated in an ordered fashion to form an ultrathin 1D nanoribbon structure, as observed by detailed time dependent TEM and HRTEM analysis. It has been found that the high aspect ratio and porous surface morphology of these nanoribbons have significantly improved their electronic and spintronic properties as manifested by their photocatalysis, gas sensing, electrochemical, and magnetic behaviors. These hematite nanoribbons exhibit a weak ferromagnetic behavior due to surface spin disorder and shape anisotropy. Lateral confinement of electrons increases the band gap of the nanoribbons, as evident from the UV absorption analysis, which in turn improves their photocatalytic degradation efficiency (rate constant ∼0.95 h(-1)) by delaying the electron-hole recombination process. However, their liquid petroleum gas sensing properties have been found to be mainly governed by the improved (porous) surface of the hematite nanoribbons that provides huge interaction sites for the analyte gas. Most of all, these hematite nanoribbons show a significantly enhanced pseudocapacitive performance exhibited by their high specific capacitance of about 145 F g(-1) at a current density of 1 A g(-1), high rate capability, and also long cycle stability (nearly 96% of capacity retention after 1600 charging/discharging cycles).

Regioselective Oxidation of Strained Graphene for Controllable Synthesis of Nanoribbons

We propose a regioselective unzipping and cutting of strained graphene by oxidation to form graphene nanoribbons (GNRs) of controllable width with well-defined and smooth edges at low temperature. The proposed process is based on first-principles calculations involving a uniaxial external compressive strain along the armchair direction. The process consists of three steps: (i) compressive strain engineering of graphene into periodic 1D sinusoidal ripple patterns, (ii) oxidation of a strained ripple, which leads to the unzipped graphene ripple with curvature-directed linear alignment of ether chains along the zigzag (ZZ) directions perpendicular to the strain, and (iii) subsequent further oxidation of the highly ordered unzipped ripple, which cuts it into uniform-width ZZ-GNRs. This method offers a potentially high level of control of the ZZ-GNRs width at low temperature.

Rapid Synthesis and Electrochemiluminescence Behavior of CdTe Nanoribbons

A rapid chemical method has been developed for the synthesis of the CdTe nanoribbons with cubic crystalline phase. The method is based on the template-engaged synthesis in which the Te nanowires were used as template reagents. On the basis of a series of experiments and characterizations, the electrochemical property of CdTe nanoribbons was determined by the voltammetric technique. Furthermore, electrochemiluminescence property of CdTe nanoribbons was investigated. The results show that CdTe nanoribbons are helpful to obtain stable electrochemiluminescence emission for 1200 seconds.

Inorganic Nanostructures with Sizes down to 1 nm: A Macromolecule Analogue

Ultrathin nanostructures exhibit many interesting properties which are absent or less-pronounced in traditional nanomaterials of larger sizes. In this work, we report the synthesis of ultrathin nanowires and nanoribbons of rare earth hydroxides and demonstrate some new phenomena caused by their atomic-level lateral size (1 nm), including ligand-induced gelation, self-assembly framework, and conformational diversity. These features are typically, although not exclusively, found in polymer solutions. The properties of the inorganic backbone and the emerging polymeric characteristics combined prove to be very promising in the design of new hybrid materials.

Rapid synthesis of CuO nanoribbons and nanoflowers from the same reaction system, and a comparison of their supercapacitor performance

One-dimensional CuO nanoribbons and three-dimensional CuO nanoflowers were synthesized via a facile, rapid, low-temperature, one-pot water bath method, in which the synthesis was performed in Cu(CH3COO)2/NaOH and aqueous/ethanol systems at 70 °C for 15 min. Control over the shape and dimensionality of the well-defined CuO single crystals was achieved simply by varying the order of addition of the reactive materials. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and selected area electron diffraction were used to characterize the products. The formation mechanism in the in situ, rapid reaction was investigated. In Brunauer-Emmett-Teller and thermogravimetry measurements, the nanoribbons exhibited a higher specific surface area and higher adsorption capabilities than the nanoflowers. Using cyclic voltammetry, chronopotentiometry and EIS measurement for supercapacitance, it was shown that the nanoflower electrodes had better performance than the nanoribbon electrodes, however, the nanoribbon/C electrodes had better performance than the nanoflower/C electrodes at lower current density, but were worse at higher current density.

Synthesis and characterization of ultrathin metal coordination Prussian blue nanoribbons

Ultrathin metal coordination Prussian blue (PB) nanoribbons with tunable width have been successfully synthesized. The morphology and microstructure of PB nanoribbons are characterized using UV-vis, FT-IR, AFM, TEM and XRD. PB nanoribbons synthesized possess an ultrathin thickness of approximately 1 nm and narrow width. The width of PB ribbons can be tuned by varying the chain length of polymeric precursors. The PB hybrid nanoribbons synthesized exhibit enhanced thermal stability and electrochemical activity. The merit of narrow and tunable width as well as ultrathin thickness of PB hybrid nanoribbons along with enhanced thermal stability and electrochemical activity makes them potentially useful in nano-devices, biosensors and so on.

Synthesis and synergistic flocculation of Na2Ti3O7 nanoribbons

Na2Ti3O7 nanoribbons is synthesized via a convenient hydrothermal process. The characterization successively reveals that the nanoribbons have a good crystallinity and uniformity with the width of 60–120nm, the length more than 10μm and the growth direction of [001]. The charge densities that deeply influence the flocculation are measured under the different pH conditions. The Na2Ti3O7 nanoribbons presents the novel retention and flocculation properties in the dual retention system combined with the cationic polyacrylamide. The nanoribbons with super-high-aspect ratio possess the very large bridging effect in the micro-particle retention aided system.

Synthesis of CuO nanowalnuts and nanoribbons from aqueous solution and their catalytic and electrochemical properties

One dimensional copper hydroxide nanostrands, two dimensional Cu(2)(OH)(3)NO(3) nanoribbons and three dimensional CuO nanowalnuts were synthesized from the same diluted copper nitrate solution with ethanolamine at room temperature and 10 °C, respectively. The Cu(2)(OH)(3)NO(3) nanoribbons were formed by slowly hydrolyzing ethanolamine at low temperature. The CuO nanowalnuts were formed through dehydration of copper hydroxide nanostrands in aqueous solution at room temperature. Although their average size is about 500 nm, the specific surface area of the CuO nanowalnuts can be as large as 61.24 m(2) g(-1), due to their particular morphology with assembling of 8 nm grains. The Cu(2)(OH)(3)NO(3) nanoribbons were converted to CuO porous nanoribbons, keeping the shape. The catalytic performance of the CuO nanowalnuts for CO oxidation is 160 mL h(-1) g(cat)(-1) which is 23 times higher than those of the CuO porous nanoribbons and 40 nm commercial CuO nanoparticles, respectively. The electrochemical properties of the CuO nanowalnuts were also examined in a lithium-ion battery. After 30 cycles, the capacity of the as-prepared CuO nanowalnuts could sustain 67.1% (407 mA h g(-1)) of the second cycle (607 mA h g(-1)) at a rate of 0.1 C.

Synthesis, characterization, and finite size effects on electricaltransport of nanoribbons of the charge density wave conductorNbSe3

NbSe3 exhibits remarkable anisotropy in most of its physical properties and has been a model systemfor studies of quasi-one-dimensional charge density wave (CDW) phenomena. Herein, wereport the synthesis, characterization, and electrical transport of single-crystallineNbSe3 nanoribbons by a facile one-step vapour transport process involving the transport of seleniumpowder onto a niobium foil substrate. Our investigations aid the understanding of the CDW natureof NbSe3 and the growth process of the material. They also indicate thatNbSe3 nanoribbons have enhanced CDW properties compared to those of the bulk phase due tosize confinement effects, thus expanding the search for new mesoscopic phenomena at thenanoscale level. Single nanoribbon measurements of the electrical resistance as a function oftemperature show charge density wave transitions at 59 and 141 K. We also demonstratesignificant enhancement in the depinning effect and sliding regimes mainly attributed tofinite size effects.

Nanostructures of sodium titanate/zirconium oxide

In this work is reported the synthesis of nanotubes and nanoribbons from mixed oxides (Ti1−x Zr x O2·nH2O), employing hydrothermal treatment in a highly alkaline medium. The morphology and crystal structure of the products obtained via hydrothermal treatment depend on the value of x. For example, for x equal to 0 and 0.50 were observed the presence of nanotubes (diameter around 9 nm) and nanoribbons (diameter around 200 nm), respectively. However, for x values above 0.50, there was no morphological change. Regarding the crystalline structure of these samples, for x equal to 0 was observed the sodium titanate phase; already for x values up to 0.50, we observed the presence of two crystalline phases: sodium titanate and tetragonal ZrO2. For x values above 0.50, only tetragonal ZrO2 was observed. Furthermore, only the product obtained from x equal to 0.15 was observed the presence of three-dimensional flower-like arrangements. The results obtained by the characterization techniques showed the segregation of zirconium after hydrothermal treatment of precursors with x less or equal to 0.50. Thus, we describe the important role that Ti/Zr molar ratio of the precursor plays on the morphology and crystalline phase of the products formed by hydrothermal treatment.

Silver nanoribbons synthesized on a silicon surface by the “layer-by-layer” technique

Conditions for the synthesis of silver nanoribbons on a silicon surface by the “layer-by-layer” technique were determined for the first time. The synthesized structures were studied by scanning electron microscopy, energy-dispersion microanalysis, and X-ray diffraction. A conclusion on the sequence of possible reactions occurring on the surface during the synthesis was drawn on the basis of the experimental data.

Synthesis of alpha-alumina nanoribbons: characterization and their morphological evolution

Single crystalline α-alumina nanoribbons were synthesized by reacting aluminum with silicon monoxide at high temperature. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and high-resolution transmission electron microscope (HRTEM). The intense peaks of XRD pattern indicate that the prepared nanoribbons have a high degree of crystallinity. In the present work, silicon monoxide was used as an oxidant and precursor, which served to control the reaction rate. An interesting morphological evolution that nanoribbons resulted from nanosaws was described, and these novel nanosaws were also carefully characterized.