Structural and optical properties of TiO2–Ge nanoparticles prepared through laser ablation in liquid medium

2017 ◽  
Vol 95 (7) ◽  
pp. 645-649 ◽  
Author(s):  
Shaista Shahzada ◽  
Anbarin Fatima ◽  
Asma Nazir ◽  
Arshad Mehmood ◽  
Mazhar Mehmood ◽  
...  
Keyword(s):  
Optical Properties ◽  
Laser Ablation ◽  
Average Particle Size ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Visible Range ◽  
Average Particle ◽  
Laser Ablation In Liquid ◽  
X Ray ◽  
Scanning Electron

Quantum dot (QD) composite nanoparticles of titania germanium (TiO2–Ge) were fabricated by pulsed laser ablation of composite targets of TiO2–Ge immersed in deionized water. The single phase crystallanity, lattice parameters, and the evaluation of crystallite size of nanoparticles was investigated by X-ray diffraction (XRD). The morphology of the samples was analyzed through scanning electron microscopic studies. The average particle size calculated through XRD and measured through scanning electron microscope is in the range from 18 to 29 nm and are in agreement with each other. Compositional study was carried out through electron dispersive X-ray analysis showing that the ablation rate of Ge is smaller than TiO2. Optical properties were measured by UV–visible transmission spectra and Raman spectroscopy. The band gap of composite particles varies from the UV to the visible range by varying concentration of Ge QDs. This work shows that pulsed laser ablation in liquid media is an easy approach to synthesize ultrafine, contamination-free nanosized material, which is difficult to produce by other conventional methods.

scholarly journals Silver and Copper nano-colloid generation via Pulsed Laser Ablation in Liquid: Recirculation nanoparticle production mode

2021 ◽  
Author(s):  
Sithara Sreenilayam Pavithran ◽  
Ronan McCann ◽  
Éanna McCarthy ◽  
Brian Freeland ◽  
Karsten Fleischer ◽  
...  
Keyword(s):  
Particle Size ◽  
Laser Ablation ◽  
Average Particle Size ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Average Particle ◽  
Laser Ablation In Liquid ◽  
Wide Range ◽  
Ligand Free ◽  
Unique Chemical

Metal nanoparticles have unique chemical, physical, electrical, and optical properties that make them attractive for a wide range of applications in sensing, anti-fouling surfaces, medicine, and conductive inks. Pulsed Laser Ablation in Liquid (PLAL) is a green method of nanoparticle colloid production, capable of producing ligand-free nanoparticles in solution without the need for hazardous, environmentally unfriendly chemicals. Control of the process parameters can give control over the resulting colloid properties such as particle size distribution. In this work, silver (Ag) nanoparticles (NPs) with average particle size from 2.04 to 19.3 nm and copper (Cu) NPs with average particle size from 40 to 85.9 nm were produced by PLAL) technique.

SYNTHESIS OF ULTRAFINE/NANOSIZE POWDERS OF IRON OXIDES BY PULSED LASER ABLATION AND COLD CONDENSATION

1996 ◽  
Vol 10 (30) ◽  
pp. 1517-1527 ◽  
Author(s):  
S. R. SHINDE ◽  
A. G. BANPURKAR ◽  
K. P. ADHI ◽  
A. V. LIMAYE ◽  
S. B. OGALE ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Vibrating Sample Magnetometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Excimer Laser Ablation ◽  
Nanosize Particles ◽  
Cold Condensation ◽  
Scanning Electron

Ultrafine/nanosize powders of iron oxide have been synthesized from a sintered α- Fe 2 O 3 target by pulsed excimer laser ablation and cold condensation. The influence of target porosity and temperature of condensation on the formation of nanosize particles has been studied. The nanosize powders have been characterized by X-ray diffraction, Mössbauer spectroscopy, vibrating sample magnetometry and scanning electron microscopy. It is shown that the formation of ultrafine/nanosize particles is strongly governed by the target porosity, whereas, the temperature of condensation, over a range from 27°C to −130°C, does not affect the magnetic properties of the nanoparticles.

scholarly journals Pulsed Laser Ablation of the Solid Targets in a Liquid Environment

2016 ◽  
Vol 59 (1) ◽  
pp. 68-73
Author(s):  
M. Osiac ◽  
M.A. Dinu ◽  
M.T. Udristioiu
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Morphological Properties ◽  
Medical Applications ◽  
Gold Target ◽  
Liquid Environment ◽  
X Ray ◽  
Compositional Properties ◽  
Scanning Electron

AbstractIn this paper, the viability of laser ablation of gold target immersed in medical distillated water used to produce nanoparticles having morphological, structural and compositional properties for medical applications is explored. The morphological properties were investigated by means of scanning electron microscopy (SEM). Energy-dispersive X-ray spectroscopy (EDX) analysis was used to reveal the composition of resulting particles. The absorbance in the wavelengths range of 300-800 nm can be assigned to the small gold nanoparticles.

scholarly journals Highly Defective Dark Nano Titanium Dioxide: Preparation via Pulsed Laser Ablation and Application

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2054 ◽  
Author(s):  
Elena D. Fakhrutdinova ◽  
Anastasiia V. Shabalina ◽  
Marina A. Gerasimova ◽  
Anna L. Nemoykina ◽  
Olga V. Vodyankina ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Visible Light ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Antibacterial Activities ◽  
Scanning Calorimetry ◽  
Laser Ablation In Liquid ◽  
X Ray ◽  
Nano Titanium Dioxide ◽  
Adsorption Desorption

The development of methods to synthesize and study the properties of dark titania is of the utmost interest due to prospects for its use, primarily in photocatalysis when excited by visible light. In this work, the dark titania powder was prepared by pulsed laser ablation (Nd:YAG laser, 1064 nm, 7 ns) in water and dried in air. To study the changes occurring in the material, the thermal treatment was applied. The structure, composition, and properties of the obtained powders were studied using transmission electron microscopy, low-temperature N2 adsorption/desorption, X-ray diffraction, thermogravimetry/differential scanning calorimetry, X-ray photoelectron, Raman and UV-vis spectroscopies, and photoluminescence methods. The processes occurring in the initial material upon heating were studied. The electronic structure of the semiconductor materials was investigated, and the nature of the defects providing the visible light absorption was revealed. The photocatalytic and antibacterial activities of the materials obtained were also studied. Dark titania obtained via laser ablation in liquid was found to exhibit catalytic activity in the phenol photodegradation process under visible light (>420 nm) and showed antibacterial activity against Staphylococcus aureus and bacteriostatic effect towards Escherichia coli.

scholarly journals Preparation of Nanostructured HgI2 Nanotubes /Si Photodetector by Laser Ablation in Liquid

2021 ◽  
Author(s):  
Amnah S. Abd-Alrahman ◽  
Raid Ismail ◽  
Mudhafar A. Mohammed
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Laser Ablation ◽  
Energy Gap ◽  
Average Length ◽  
Average Particle Size ◽  
Average Diameter ◽  
Average Particle ◽  
Optical Energy Gap ◽  
Laser Ablation In Liquid

Abstract In this work, HgI2 nanotubes/Si heterojunction has been prepared by pulsed laser ablation in ethanol at laser fluence of 12.7 J/cm2. The structural and optical properties of HgI2 nanotubes (NTs) are studied. The X-ray diffraction (XRD) result shows the presence of the mixture of tetragonal and orthorhombic phases of HgI2. The optical properties results show that the optical energy gap of HgI2 NTs was 2.98 eV measured at room temperature. The photoluminescence (PL) spectra of HgI2 display a single emission centered at 535nm. Fourier transformed infrared (FT-IR) results reveal the existence of small bonds at 612 and 1102 cm− 1. Scanning electron microscope (SEM) image show formation of nanotubes and spherical nanoparticles with average particle size of 23nm. Transmission electron microscope (TEM) image of HgI2 confirms the formation of nanotubes morphology with an average diameter of 80nm and an average length of 1.6µm. The I-V curve of HgI2 NTs/p-Si heterojunction were measured at dark and illumination. The responsivity of HgI2 NTs/p-Si heterojunction photodetector is 1.09A/W at 450 and the detectivity and external quantum efficiency are 3.6 ×1012 Jones at 450 and 3×102% at 400nm, respectively, without using post annealing.

scholarly journals Structural and Magnetic Properties of Co0.5Ni0.5Ga0.01Gd0.01Fe1.98O4/ZnFe2O4 Spinel Ferrite Nanocomposites: Comparative Study between Sol-Gel and Pulsed Laser Ablation in Liquid Approaches

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2461
Author(s):  
Munirah A. Almessiere ◽  
Sadik Güner ◽  
Yassine Slimani ◽  
Mohammed Hassan ◽  
Abdulhadi Baykal ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Laser Ablation ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Magnetic Data ◽  
Laser Ablation In Liquid ◽  
X Ray ◽  
Magnetic Parameters

In this study, the samples of the ZnFe2O4 (ZFO) spinel ferrites nanoparticles (SFNPs), Co0.5Ni0.5Ga0.01Gd0.01Fe1.98O4 (CNGaGdFO) SFNPs and (Co0.5Ni0.5Ga0.01Gd0.01Fe1.98O4)x/(ZnFe2O4)y (x:y = 1:1, 1:2, 1:3, 2:1, 3:1 and 4:1) (CNGaGdFO)x/(ZFO)y spinel ferrite nanocomposites (NC) have been synthesized by both sol-gel and Green pulsed laser ablation in liquid (PLAL) approaches. All products were characterized by X-ray powder diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), elemental mappings and energy dispersive X-ray spectroscopy (EDX). It was objected to tune the magnetic properties of a soft spinel ferrite material with a softer one by mixing them with different fractions. Some key findings are as follows. M-H investigations revealed the exhibition of ferrimagnetic phases for all synthesized samples (except ZnFe2O4) that were synthesized by sol-gel or PLAL methods at both 300 K and 10 K. ZnFe2O4 ferrite NPs exhibits almost paramagnetic feature at 300 K and glass-like phase at very low temperatures below 19.23 K. At RT analyses, maximum saturation magnetization (MS) of 66.53 emu/g belongs to nanocomposite samples that was synthesized by sol-gel method and x:y ratio of 1:3. At 10 K analyses, MS,max = 118.71 emu/g belongs to same nanocomposite samples with ratio of 1:3. Maximum coercivities are 625 Oe belonging to CNGaGdFO and 3564 Oe belonging to NC sample that was obtained by sol-gel route having the 3:1 ratio. Squareness ratio (SQRs = Mr/MS) of NC sample (sol-gel, 4:1 ratio) is 0.371 as maximum and other samples have much lower values until a minimum of 0.121 (laser, 3:1) assign the multi-domain wall structure for all samples at 300 K. At 10 K data, just CNGaGdFO has 0.495 SQR value assigning single domain nature. The maximum values of effective crystal anisotropy constant (Keff) are 5.92 × 104 Erg/g and 2.4 × 105 Erg/g belonging to CNGaGdFO at 300 K and 10 K, respectively. Further, this sample has an internal anisotropy field Ha of 1953 Oe as largest at 300 K. At 10 K another sample (sol-gel, 3:1 ratio) has Ha,max of 11138 Oe which can also be classified as a soft magnetic material similar to other samples. Briefly, most magnetic parameters of NCs that were synthesized by sol-gel route are stronger than magnetic parameters of the NCs that were synthesized by PLAL at both temperatures. Some NC samples were observed to have stronger magnetic data as compared to magnetic parameters of Co0.5Ni0.5Ga0.01Gd0.01Fe1.98O4 NPs at 10 K.

scholarly journals Synthesis of gold nanoparticles by laser ablation on porous silicon for sensing CO2 gas

2018 ◽  
Vol 16 (36) ◽  
pp. 1-10
Author(s):  
Uday Muhsin Nayef
Keyword(s):  
Laser Ablation ◽  
Porous Silicon ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
X Ray Diffraction ◽  
Laser Ablation In Liquid ◽  
Co2 Gas ◽  
X Ray ◽  
P Type ◽  
Si Wafer

In this research, porous silicon (PS) prepared by anodization etching on surface of single crystalline p-type Si wafer, then Gold nanoparticle (AuNPs) prepared by pulsed laser ablation in liquid. NPs deposited on PS layer by drop casting. The morphology of PS, AuNPs and AuNPs/PS samples were examined by AFM. The crystallization of this sample was characterized by X-ray diffraction (XRD). The electrical properties and sensitivity to CO2 gas were investigated to Al/AuNPs/PS/c-Si/Al, we found that AuNPs plays crucial role to enhance this properties.

Sign in / Sign up

Export Citation Format

Share Document