Preparation Of Bi Research Articles

Preparation of Bi2Te3 Based on Saturable Absorption System and Its Application in Fiber Lasers

Fiber laser is a fundamental component of laser systems and is of great significance for development of laser technology. Its pulse output can be divided into Q-switched and mode-locked. Achieving ultrashort pulse with narrower pulse duration and higher power is the focus of current research on mode-locked lasers. As an important component of fiber laser systems, saturable absorber (SA) can modulate losses in the optical cavity and generate pulses, enabling the laser system to achieve pulse output under long-term normal operating conditions better. Therefore, expanding the selection range of materials with better saturable absorption properties to improve the quality of pulse output is an important topic in current research. Here, the second generation topological insulator Bi2Te3 single crystal is prepared, and a ring fiber laser system is built with the Bi2Te3 SA. The mode-locked pulse with a pulse duration of 288 fs and a signal-to-noise ratio of 80.202 dB is realized. This result verifies that Bi2Te3, as a member of topological insulator, has good saturable absorption characteristics, and has broad prospects for the application research in lasers.

New application of resin macrospheres: preparation of Bi2O3/C photocatalysts from an inexpensive organic carbon source and their application in dye wastewater treatment

The Bi2O3/C optimized band structure improved light absorption and electron transfer efficiency.

Photochemical [2 + 2] Cycloaddition of Alkenyl Boronic Derivatives: An Entry into 3-Azabicyclo[3.2.0]heptane Scaffold.

The synthesis of 3-azabicyclo[3.2.0]heptyl boropinacolates and trifluoroborates via the [2 + 2] photocycloaddition of the corresponding alkenyl boronic derivatives and maleimides or maleic anhydride is described. Optimization of the reaction conditions (i.e., wavelength, concentration of the reagents, photosensitizer) was carried out, and the scope and limitations of the method were studied. Alkenyl boronic acid pinacolates were found to be more suitable for the [2 + 2] cycloaddition, providing better reaction outcomes compared to the trifluoroborates. The utility of this approach was shown by the preparation of bi- and trifunctional building blocks (21 examples), which could be easily synthesized on up to 60 g scale. These cycloadducts provide a convenient entry into the 3-azabicyclo[3.2.0]heptane scaffold through the C-C coupling or oxidative deborylation reactions.

Synchronized preparation of bi- and tri-qubit entanglement with nitrogen-vacancy centers coupled to microtoroidal resonators

We research the input–output process with nitrogen-vacancy (NV) centers fixed on the surface of micro-toroidal resonators (MTRs) with whispering-gallery modes (WGMs) and then present an efficient scheme for the synchronized generation of Bell and W states. In our scheme, entanglement can be prepared with the assistance of the polarized photon pulse and electron spin state of NV center. The analysis of the efficiency shows that our scheme is feasible with the current technology, which can be further used for quantum information processing.

Preparation of Bi2Sr2CaCu2O8+δ-YBa2Cu 3O7−δ Bilayer Films by Acetate Based Photosensitive Sol-Gel Method

Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sr <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> CaCu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">8+δ</sub> (Bi-2212)/YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> (YBCO) and YBCO/Bi-2212 heteroepitaxial bilayer films have been successfully prepared on LaAlO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (LAO) monocrystalline substrates by acetate based photosensitive Sol-Gel method. Two superconducting transition steps in the R-T curves of YBCO/Bi-2212 and Bi-2212/YBCO bilayer films were clearly observed. The first transition step has the superconducting critical transition temperature (Tc) of 90.1-90.8 K and the superconducting transition width (ΔTc) of 2-2.2 K, and these values correspond to the Tc and ΔTc values of YBCO single film. The second transition step has the Tc of 80-84 K and the ΔTc of 4.6-5.2 K, and these values correspond to the Tc and ΔTc values of Bi-2212 single film. XRD results showed that YBCO/Bi-2212 and Bi-2212/YBCO bilayer films grow heteroepitaxially with good in-plane and out-of-plane growth texture.

Preparation of Bi&lt;sub&gt;2&lt;/sub&gt;WO&lt;sub&gt;6&lt;/sub&gt; Powders with Micro-Carbon Spheres Acting as a Template by Refluxing Method

Firstly, we made the glucose as raw material to prepare carbon microspheres hydrothermal method. Then carbon microspheres use as a template, and Bi (NO3)3.5H2O and Na2WO4.2H2O as raw material to synthesize the Bi2WO6/carbon composite by refluxing method. Finally, Bi2WO6 samples were obtained by calcination so as to remove the template. And samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffuse reflection absorption spectroscopy (DRS). The Rhodamine B (RhB) was simulated as the sewage under the visible light to study the impact of the illumination time, calcination temperature and the amount of catalyst. The results show that Bi2WO6 synthesized by calcination at 500 °C had the best photocatalytic performance, and when samples (30 mg) was put into RhB solution (10 mg/L) and illumination for 180 min, the degradation rate could reach 92%, which demonstrated that the samples exhibit excellent visible photocatalytic performance.

Preparation of Bi2S3/carbon quantum dot hybrid materials with enhanced photocatalytic properties under ultraviolet-, visible- and near infrared-irradiation.

To solve the growing pollution issues, it is a promising alternative to develop efficient sunlight-driven photocatalysts for purifying organic wastewater. Herein, we report a new and efficient full-spectrum-responsive photocatalyst composed of Bi2S3 nanotubes incorporated with carbon quantum dots (C-dots) for rapidly degrading methylene blue (MB) and tetracycline hydrochloride (TC). Compared with naked Bi2S3 nanotubes, the as-prepared Bi2S3/C-dot nanohybrids show a remarkably higher photocatalytic efficiency for degrading MB or TC under ultraviolet (UV-), visible (vis-) and near-infrared (NIR-) light irradiation within 5 minutes. A possible mechanism is proposed for the enhanced photocatalytic activity of the Bi2S3/C-dot nanohybrids. A lower band gap as well as a wider absorbance in the UV-, vis- and NIR-regions can increase the light harvesting ability of the Bi2S3/C-dots. Meanwhile, the existence of C-dots can facilitate the charge separation of the photo-generated electron/hole pairs while electrons transfer from Bi2S3 to C-dots. Besides, an increased surface area of the Bi2S3/C-dot nanohybrids also contributes to the excellent photocatalytic activity.

Coupling with a narrow-band-gap semiconductor for the enhancement of visible-light photocatalytic activity: preparation of Bi2OxS3-x/Nb6O17 and application to the degradation of methyl orange.

A series of 2D sheet Bi2OxS3-x/Nb6O17 (Bi/Nb) heterostructure photocatalysts were synthesized through a facile hydrothermal vulcanization method between Bi(3+) exchanged K4Nb6O17 and thiourea (NH2CSNH2). XRD results confirm that the heterostructures were composed of Bi2OxS3-x and Nb6O17. HRTEM indicates that Bi2OxS3-x was successfully intercalated into layers of K4Nb6O17. Such large interfacial contacts can be beneficial to the transfer and separation of photogenerated charge carriers. Thus the composites exhibit good photocatalytic performance for the degradation of methyl orange (MO) under visible light irradiation (λ > 400 nm), which is superior to that of both precursors, pure Bi2S3 and K4Nb6O17. Radical capture tests reveal that photogenerated holes h(+) and ˙O2(-) play important roles in the photodegradation of MO. And based on the UV-visible diffuse reflectance spectra (DRS) and the band gap of the semiconductors, the mechanism of the enhanced visible light photocatalytic activity of these composites has been proposed.

Coupling with a narrow-band-gap semiconductor for enhancement of visible-light photocatalytic activity: preparation of Bi2S3/g-C3N4 and application for degradation of RhB

Bi2S3 was synthesized on the surface of g-C3N4 to narrow the band gap of the catalyst for a visible-light response.

N-heterocyclic carbene-phosphinidyne transition metal complexes.

The N-heterocyclic carbene-phosphinidene adduct IPrPSiMe3 is introduced as a synthon for the preparation of terminal carbene-phosphinidyne transition metal complexes of the type [(IPrP)MLn ] (MLn =(η(6) -p-cymene)RuCl) and (η(5) -C5 Me5 )RhCl). Their spectroscopic and structural characteristics, namely low-field (31) P NMR chemical shifts and short metal-phosphorus bonds, show their similarity with arylphosphinidene complexes. The formally mononegative IPrP ligand is also capable of bridging two or three metal atoms as demonstrated by the preparation of bi- and trimetallic RuAu, RhAu, Rh2 , and Rh2 Au complexes.

Characterization of Superconducting BSCCO/CaSiO&lt;sub&gt;3&lt;/sub&gt; and BSCCO/CaZrO&lt;sub&gt;3&lt;/sub&gt; Ag PIT Wires

The addition of two compounds, calcium silicate and calcium zirconate was tested, in the preparation of Bi: 2212 silver sheathed wires by powder-in-tube method, which were successfully tested previously in processing chips. The wires were treated in an atmosphere of O2/Ar using partial melting method. The characterizations were structural and on their electrical and magnetic properties. As the results, transition temperatures were higher than the expected for this stage, ranged from 105K (BSCCO880) to 116K (+Si883). The critical current densities encountered in transport and magnetization measurements were improved in comparison with the wires without addition.

Preparation of Bi:TiO2 thin films by an hybrid deposition configuration: pulsed laser deposition and thermal evaporation

The aim of this work was to report the application of an hybrid deposition configuration to deposit Titanium dioxide (TiO2) thin films modified with different amounts of bismuth (Bi:TiO2). The samples were synthesized combining a TiO2 laser ablation plasma with a flux of vapor of bismuth produced by thermal evaporation. By varying the deposition rate of Bi it was possible to control the amount of Bi incorporated in the film and consequently the film properties. A detailed compositional, structural, and optical characterization by XPS, RBS, Raman spectroscopy, and UV–Vis spectrometry techniques is discussed. Photocatalytic response of the deposited thin films was studied through the degradation of a malachite green solution.

Sol-Gel Preparation of Bi&lt;sub&gt;2&lt;/sub&gt;InTaO&lt;sub&gt;7&lt;/sub&gt; and its Photocatalytic Behavior for Organic Compounds Degradation

In this work it was carried out the synthesis of Bi2InTaO7 pyrochlore-type structure compound by the sol-gel method. By X-Ray powder diffraction the sol-gel compound calcined at 600°C showed the pyrochlore-type structure phase and by scanning electron microscopy its morphology revealed the presence of particles with size lower than 1 micron. Its chemical elemental composition was determined by EDS analysis. Results of SBET area and Eg values of this compound suggested higher properties than those obtained by the compound prepared by solid state reaction. Bi2InTaO7 sol-gel was used as active photocatalyst on the degradation reaction of organic compounds such as Alizarin Red S, and Red and Green Tide, under UV-light. Half time life results showed that Bi2InTaO7 sol-gel compound could be a good candidate for the degradation of organic compounds because after few minutes showed high efficiency on the degradation reaction of Alizarin Red S (t1/2 = 30 min), and Green Tide inactivation (t1/2 = 17 min).

Study of Preparation and Property of BZN Ceramic Ink

Preparation of Bi_2O_3-ZnO- Nb_2O_5(BZN)ceramic ink for Ink-Jet printing was studied with an aqueous,multifunctional organic solvent-sokalan PM70.The effects of different content of PM70 and the solid content BZN powder on the stability and viscosity of suspension liquid were discussed,and rather stable ink with high solid content was obtained.A planar capacitor was printed successfully with the prepared ink by the iP-210 Personal Plotter controlled by MD-E-201H.The influence of controlling parameters on the Ink-Jet printing was also dealt with.The thickness distribution of printed images was measured by Rodenstock RM600S.The experiment indicates that when the content of PM70 is 3.2wt%, the stability of ceramic ink is much more stable with the highest solid content of 48.8wt%.A better practical printing result will be obtained in the condition that drive voltage is 10V,the pulse width is 1.5 and the pulse period is about 800μs.

Preparation of Bi 2- xSb xTe 3 thermoelectric films by electrodeposition

Bi 2- x Sb x Te 3 thermoelectric films were electrochemically deposited from the solution containing Bi 3+, HTeO 2 +and SbO +. ESEM (environmental scanning electron microscope) investigations indicated that the crystalline state of Bi 2- x Sb x Te 3 films transformed from equiaxed crystal to dendritic crystal with the negative shift of deposition potential. XRD and EDS were used to characterize the structure and composition of the electrodeposited films. The Seebeck coefficient and the temperature dependence of the resistance of Bi 2- x Sb x Te 3 films were measured. The results showed that the composition of the film electrodeposited at −0.5 V is Bi 0.5Sb 1.5Te 3 with the largest Seebeck coefficient of 213 μV·K −1.

A simple method for preparation of Bi and Sb metal nanocrystalline particles

Bi or Sb nanocrystalline metal particles can very easily be prepared by a solid–solid reaction of the powders of BiCl3 or SbCl3 and KBH4 at room temperature. The characterizations indicate that the resultant is the pure metal-nanoparticles with an average diameter of about 30–80 nm.

Preparation of Bi2Te3 Films by Electrodeposition from Solution Containing Bi‐Ethylenediaminetetraacetic Acid Complex and TeO2.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Preparation of metastable Bi-2223 phase of Bi 2(Ln xCa 2− x)Ca 2Cu 3O z thin films (0.3⩽ x⩽0.7, Ln=Pr, Nd, Sm, Eu and Gd)

Preparation of Bi 2(Ln x Ca 2− x )Ca 2Cu 3O z thin films (0.3⩽ x⩽0.7, Ln=Pr, Nd, Sm, Eu and Gd) by the laser ablation method and their physical properties are described. These films have been of a metastable Bi-2223 phase, which had not been synthesized by the solid-state reaction method. In the Bi 2(Pr x Ca 2− x )Ca 2Cu 3O z system, the resistivity of Bi-2223 films has decreased with decreasing Pr content x, and the film with x=0.3 has shown the lowest resistivity. When x is fixed to 0.3 in the Bi 2(Ln x Ca 2− x )Ca 2Cu 3O z systems, the film with Ln=Sm has shown the lowest resistivity. However, the result of the resistivity and magnetic measurements have shown that none of the films is superconductive.

Strain as driving force for interface roughening of δ-doping layers

The growth of smooth and abrupt heteroepitaxial semiconductor interfaces is limited by strain originating from the lattice mismatch of the different materials. Employing measurements of crystal truncation rods, we have performed an extensive study of the impact of intra-layer strain on structural properties of ultra-thin ( δ) doping layers. The use of molecular beam epitaxy and related methods, i.e., the use of surfactants and low growth temperatures with subsequent annealing (solid phase epitaxy) allows the preparation of Bi, Sb, Ge and Si 1− x C x δ layers with doping profiles of monolayer width and high peak layer concentration (>10%). We find a linear dependence of the interface roughness on the intra-layer strain.

ChemInform Abstract: Preparation of Bi‐ and Tridentate Doubly P‐Chiral Diphosphine Dioxide Ligands for Asymmetric Catalysis.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.