CHARACTERIZATION OF CARBON NITRIDE NANOPARTICLES PREPARED BY LASER ABLATION IN LIQUID FOR OPTOELECTRONIC APPLICATION

2015 ◽  
Vol 22 (04) ◽  
pp. 1550055 ◽  
Author(s):  
KHAWLA S. KHASHAN ◽  
MAYYADAH H. MOHSIN
Keyword(s):  
Laser Ablation ◽  
High Performance ◽  
Carbon Nitride ◽  
High Efficiency ◽  
Silicon Substrates ◽  
Laser Ablation In Liquid ◽  
Optoelectronic Application ◽  
Transmission Electron ◽  
Stretching Vibration ◽  
Size And Morphology

In this work, carbon nitride ( C 3 N 4) nanoparticles (NPs) were synthesized by pulse laser ablation of graphite in ammonium solution, and deposited on silicon substrates by spray. Fourier transform infrared spectroscopy (FTIR), UV-visible spectrophotometer and transmission electron microscopy (TEM) were used to study bonding, absorption, size and morphology of the produce NPs. The FTIR absorption peaks at 2121.6, 1631.7 and 1384 cm-1 stretching vibration bond, it is inferred for the C ≡ N , C = N and C – N , respectively. Bonds suggests the formation, C 3 N 4 NPs. UV absorption peaks coincide with the electronic transitions corresponding to the formation, C 3 N 4 NPs with 3.98 eV optical bandgap. The TEM show the aggregation of the C 3 N 4 NPs with size ranges from 4 to 83 nm, and also the leaf-like structure are shown in the structure of C 3 N 4 suspension. High performance rectifying C 3 N 4/ Si heterojunction with a rectifying ratio exceeding 345 at V = 5 V was obtained, with high photoresponsivity of 2.33 A/W at 600 nm.The results show that C 3 N 4 NPs on silicon substrates will act as very good candidates for making high efficiency photodiodes.

Laser assisted synthesis of WS2 nanorods by pulsed laser ablation in liquid environment

2021 ◽  
pp. 2140007
Author(s):  
Pankaj Koinkar ◽  
Kohei Sasaki ◽  
Tetsuro Katayama ◽  
Akihiro Furube ◽  
Satoshi Sugano
Keyword(s):  
Electron Microscopy ◽  
Laser Ablation ◽  
2D Materials ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Laser Ablation In Liquid ◽  
Simple Method ◽  
Liquid Environment ◽  
Transmission Electron ◽  
Specific Morphology

Two dimensional (2D) materials are widely attracting the interest of researchers due to their unique crystal structure and diverse properties. In the present work, tungsten disulfide (WS[Formula: see text] nanorods were synthesized by a simple method of pulsed laser ablation in liquid (PLAL) environment. The prepared WS2 are analyzed by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), UV-visible spectroscopy (UV-vis) and Raman spectroscopy to confirm the surface morphology, phase and structure. A possible growth mechanism of WS2 is proposed. This study indicates new door for the preparation of 2D materials with specific morphology.

scholarly journals Ni2P/rGO/NF Nanosheets As a Bifunctional High-Performance Electrocatalyst for Water Splitting

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 744 ◽  
Author(s):  
Jinyu Huang ◽  
Feifei Li ◽  
Baozhong Liu ◽  
Peng Zhang
Keyword(s):  
Electron Microscopy ◽  
Water Splitting ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
High Efficiency ◽  
Splitting Method ◽  
Bifunctional Catalyst ◽  
Strong Activity ◽  
X Ray ◽  
Transmission Electron

The hydrogen generated via the water splitting method is restricted by the high level of theoretical potential exhibited by the anode. The work focuses on synthesizing a bifunctional catalyst with a high efficiency, that is, a nickel phosphide doped with the reduced graphene oxide nanosheets supported on the Ni foam (Ni2P/rGO/NF), via the hydrothermal approach together with the calcination approach specific to the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). The Raman, X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Transmission Electron Microscope (TEM), Scanning Electron Microscopy (SEM), High-Resolution Transmission Electron Microscopy (HRTEM), as well as elemental mapping, are adopted to study the composition and morphology possessed by Ni2P/rGO/NF. The electrochemical testing is performed by constructing a parallel two-electrode electrolyzer (Ni2P/rGO/NF||Ni2P/rGO/NF). Ni2P/rGO/NF||Ni2P/rGO/NF needs a voltage of only 1.676 V for driving 10 mA/cm2, which is extremely close to Pt/C/NF||IrO2/NF (1.502 V). It is possible to maintain the current density for no less than 30 hours. It can be demonstrated that Ni2P/rGO/NF||Ni2P/rGO/NF has commercial feasibility, relying on the strong activity and high stability.

scholarly journals A Pd/MnO2 Electrocatalyst for Nitrogen Reduction to Ammonia under Ambient Conditions

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 802
Author(s):  
Chang Sun ◽  
Yingxin Mu ◽  
Yuxin Wang
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Pd Nanoparticles ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Transmission Electron ◽  
Alternative Approach ◽  
Supported Pd

Electrochemical ammonia synthesis, which is an alternative approach to the Haber–Bosch process, has attracted the attention of researchers because of its advantages including mild working conditions, environmental protection, and simple process. However, the biggest problem in this field is the lack of high-performance catalysts. Here, we report high-efficiency electroreduction of N2 to NH3 on γ-MnO2-supported Pd nanoparticles (Pd/γ-MnO2) under ambient conditions, which exhibits excellent catalytic activity with an NH3 yield rate of 19.72 μg·mg−1Pd h−1 and a Faradaic efficiency of 8.4% at −0.05 V vs. the reversible hydrogen electrode (RHE). X-ray diffraction (XRD) and transmission electron microscopy (TEM) characterization shows that Pd nanoparticles are homogeneously dispersed on the γ-MnO2. Pd/γ-MnO2 outperforms other catalysts including Pd/C and γ-MnO2 because of its synergistic catalytic effect between Pd and Mn.

Synthesis of carbon nitride nanocrystals on Co/Ni-covered substrate by nitrogen-atom-beam-assisted pulsed laser ablation

2003 ◽  
Vol 18 (11) ◽  
pp. 2552-2555 ◽  
Author(s):  
Ning Xu ◽  
Hao Lin ◽  
Li Li ◽  
Weijian Pan ◽  
Jian Sun ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Nitrogen Atom ◽  
Carbon Nitride ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
Atom Beam ◽  
Transmission Electron ◽  
Deposited Films

Carbon nitride nanocrystals were synthesized on Co/Ni-covered Si(100) wafers using a nitrogen-atom-beam-assisted pulsed laser ablation deposition method. Transmission electron miscroscopy, x-ray diffraction, and Raman spectroscopy showed that as-deposited films were constructed primarily from nanometer-sized β-C3N4 and CNx crystallites. The co-catalyzation by the cobalt and nickel in the synthesis process is considered to play an important role in the formation of nanocrystalline β-C3N4. The reasons for the formation of carbon nitride nanocrystals were analyzed.

scholarly journals Synthesis of polyynes by laser ablation of graphite in ethanol

2019 ◽  
Vol 11 (21) ◽  
pp. 37-47 ◽  
Author(s):  
Khawla S. Khashan
Keyword(s):  
Laser Ablation ◽  
Carbon Nanoparticles ◽  
Pulse Laser Ablation ◽  
Pulse Number ◽  
Ethanol Solution ◽  
Electronic Transitions ◽  
Graphite Target ◽  
Transmission Electron ◽  
Stretching Vibration ◽  
Uv Visible

In this work  Polyynes was synthesized by pulse laser ablation of graphite target in ethanol solution. UV-Visible Spectrophotometer, Fourier Transform Infrared Spectroscopy (FTIR) and Transmission electron microscopy (TEM) were used to study the optical absorption, chemical bonding, particle size and the morphology.  UV absorption peaks coincide with the electronic transitions corresponding to linear hydrogen – capped polyyne (Cn+1H2), the absorption peaks intensity increased when the polyynes were produced at different laser energies and the formation rats of polyynes increased with the increasing of laser pulse number. The FTIR absorption peak at 2368.4 cm-1, 1640.0 cm-1 and 1276.8 cm-1 stretching vibration bond, were refer to the C ≡ C, C = C and C-C, respectively. A bond suggests the formation carbon nanoparticles suspend in this solvent and the TEM show the formation of spherical nanoparticles with size ranges from (1.2 to 105.9 nm) and aggregation of the carbon nanoparticles.

Erratum: “Laser Wavelength Effect on Size and Morphology of Silicon Nanoparticles Prepared by Laser Ablation in Liquid”

2014 ◽  
Vol 53 (3) ◽  
pp. 039201
Author(s):  
Pattarin Chewchinda ◽  
Takeharu Tsuge ◽  
Hiroshi Funakubo ◽  
Osamu Odawara ◽  
Hiroyuki Wada
Keyword(s):  
Laser Ablation ◽  
Silicon Nanoparticles ◽  
Laser Wavelength ◽  
Laser Ablation In Liquid ◽  
Size And Morphology

scholarly journals Clean rhodium nanoparticles prepared by laser ablation in liquid for high performance electrocatalysis of the hydrogen evolution reaction

2019 ◽  
Vol 1 (11) ◽  
pp. 4296-4300 ◽  
Author(s):  
Giulia Alice Volpato ◽  
David Muneton Arboleda ◽  
Riccardo Brandiele ◽  
Francesco Carraro ◽  
Giovanni Battista Sartori ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Performance ◽  
Ablation Procedure ◽  
Laser Ablation In Liquid ◽  
Rhodium Nanoparticles ◽  
Excellent Activity

Rhodium nanoparticles prepared by a facile laser ablation procedure show excellent activity towards the hydrogen evolution reaction.

Ultra fine carbon nitride nanocrystals synthesized by laser ablation in liquid solution

2007 ◽  
Vol 9 (6) ◽  
pp. 1181-1185 ◽  
Author(s):  
Li Yang ◽  
Paul W. May ◽  
Lei Yin ◽  
James A. Smith ◽  
Keith N. Rosser
Keyword(s):  
Laser Ablation ◽  
Carbon Nitride ◽  
Liquid Solution ◽  
Laser Ablation In Liquid ◽  
Fine Carbon

Synthesis of Carbon Encapsulated Nickel Nanoparticles by Laser Ablation in Liquid

2011 ◽  
Vol 110-116 ◽  
pp. 5487-5494 ◽  
Author(s):  
Kai Yang Niu ◽  
Jing Sun ◽  
Xi Wen Du
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Laser Ablation ◽  
High Purity ◽  
Nickel Nanoparticles ◽  
Laser Evaporation ◽  
Liquid Droplets ◽  
Laser Ablation In Liquid ◽  
Cooling Stage ◽  
Transmission Electron

Carbon encapsulated nickel nanoparticles (CENNPs) with high purity were fabricated by laser ablation of nickel target in ethanol. The size of CENNPs varies from tens to hundreds of nanometers, and CENNPs show two kinds of typical morphologies i. e. a nickel core with a carbon shell or a nickel core with two carbon shells. Transmission electron microscopy indicated that the CENNPs formed as a result of laser evaporation of the nickel target and the decomposition of ethanol, whose carbon atoms mixed with the nickel vapor, and Ni/C liquid droplets appeared during the cooling stage. The carbon shells formed by precipitation of carbon atoms on the surface of the nickel cores led to the formation of CENNPs.

scholarly journals Water Treatment Ability of CuO-ZnO Nanocomposites Synthesized by Laser Ablation and Anodization Techniques

2020 ◽  
Vol 55 (1) ◽  
Author(s):  
R.B. Rashid ◽  
D. H. Hussain ◽  
R. S. Mahmood
Keyword(s):  
Laser Ablation ◽  
High Performance ◽  
Pollutant Removal ◽  
Force Microscopy ◽  
Laser Ablation Method ◽  
Atomic Force ◽  
Transmission Electron ◽  
New Ideas ◽  
Diyala River ◽  
Anodization Method

The article describes new ideas about the differences in the pollutant-removal ability of nanocomposite prepared by two methods. Nanocomposites (CuO-ZnO) can be simply synthesized chemically in aqueous solution by anodization method or physically by a laser ablation method. Therefore, both anodization and laser ablation methods were investigated. UV-visible spectra, atomic force microscopy AFM, and transmission electron microscopy TEM were used for characterizations. Results indicated that nanoparticles prepared by laser ablation had less diameters (74nm) than that prepared by anodization method. TEM images showed that particles produced by laser ablation method were homogeneous and core-shell structures with no aggregation, but that produced by anodization method were aggregated. This result could suggest that the laser ablation method is specifically preferable. The nanoparticles diameters ranged from 10–17 nm, which may confirm that ZnO nanoparticles have successfully shielded the CuO nanocore. Results also indicated that these synthesized nanocomposites have actively removed pollutions from water samples of Diyala River. There is a clear difference between the activity of laser ablation nanocomposite and that of anodization composite. Laser ablation nanocomposite needs less than 60 min to treat 85% of water pollution, but with anodization composite, even after 90 min. the water sample is still polluted (30% treated). Laser ablation nanocomposites give high performance of removing pollutants.

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