scholarly journals Nonlinear absorptions in Au-nanoparticles-precipitated glasses induced by a femtosecond laser

2005 ◽  
Vol 54 (1) ◽  
pp. 139
Author(s):  
Qu Shi-Liang ◽  
Zhao Chong-Jun ◽  
Gao Ya-Chen ◽  
Song Ying-Lin ◽  
Liu Shu-Tian ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Au Nanoparticles ◽  
Nonlinear Absorptions

scholarly journals Electric Field Assisted Femtosecond Laser Preparation of Au@TiO2 Composites with Controlled Morphology and Crystallinity for Photocatalytic Degradation

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3816
Author(s):  
Xiaojie Li ◽  
Xin Li ◽  
Pei Zuo ◽  
Xiaozhe Chen ◽  
Misheng Liang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Electric Field ◽  
Photocatalytic Degradation ◽  
Au Nanoparticles ◽  
High Efficiency ◽  
Free Electron Density ◽  
Pulse Delay ◽  
Dye Pollutants ◽  
Amorphous Tio2 ◽  
Laser Liquid

TiO2 is popular in photocatalytic degradation dye pollutants due to its abundance and its stability under photochemical conditions. Au loaded TiO2 can achieve efficient absorption of visible light and deal with the problem of low conversion efficiency for solar energy of TiO2. This work presents a new strategy to prepare Au nanoparticles-loaded TiO2 composites through electric−field−assisted temporally−shaped femtosecond laser liquid-phase ablation of Au3+ and amorphous TiO2. By adjusting the laser pulse delay and electric field parameters, gold nanoparticles with different structures can be obtained, such as nanospheres, nanoclusters, and nanostars (AuNSs). AuNSs can promote the local crystallization of amorphous TiO2 in the preparation process and higher free electron density can also be excited to work together with the mixed crystalline phase, hindering the recombination between carriers and holes to achieve efficient photocatalytic degradation. The methylene blue can be effectively degraded by 86% within 30 min, and much higher than the 10% of Au nanoparticles loaded amorphous TiO2. Moreover, the present study reveals the crystallization process and control methods for preparing nanoparticles by laser liquid ablation, providing a green and effective new method for the preparation of high-efficiency photocatalytic materials.

scholarly journals Optical and Electrical Properties of Gold-Silver Nanoalloys Synthesized through Photochemical Reduction using Femtosecond Laser

2020 ◽  
Vol 9 (3) ◽  
pp. 177-184
Author(s):  
Affi Nur Hidayah ◽  
◽  
Yuliati Herbani ◽  
Keyword(s):  
Electrical Properties ◽  
Femtosecond Laser ◽  
Au Nanoparticles ◽  
Volume Fraction ◽  
Conductivity Measurement ◽  
Silver Ions ◽  
Optical And Electrical Properties ◽  
Photochemical Reduction ◽  
Direct Irradiation ◽  
Gold Silver

In this work we investigated the optical and electrical properties of Au-Ag nanoalloys in various volume ratios. The nanoparticles have been prepared from gold and silver ions reduced by direct irradiation femtosecond laser. The samples were added into a quartz cuvette and irradiated for 10 minutes. Each sample was observed the optical property where surface plasmon resonance (SPR) peak was existed. In addition, electrical conductivity of the colloids was derived from the measurement of the correspond zeta potential by dynamic light scattering (DLS) method. The results showed that the SPR peak of Au-Ag nanoalloy were shifted almost linearly in between 409 nm for Ag and 530 nm for Au depending on their volume fraction. The conductivity measurement showed that Au0Ag100 (pure Ag) nanoparticles has the highest value and Au100Ag0 (pure Au) nanoparticles has the lowest value, and interestingly, Au-Ag nanoalloys have the values between Au0Ag100 and Au100Ag0. Briefly, this work revealed that both optical and electrical properties of Au-Ag nanoalloys can be easily tuned by regulating the volume fraction between the two elements.

scholarly journals Nucleation and growth of gold nanoparticles initiated by nanosecond and femtosecond laser irradiation of aqueous [AuCl4]−

2018 ◽  
Vol 20 (45) ◽  
pp. 28465-28475 ◽  
Author(s):  
Collin J. Rodrigues ◽  
Julian A. Bobb ◽  
Mallory G. John ◽  
Sergey P. Fisenko ◽  
M. Samy El-Shall ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Surface Plasmon ◽  
Au Nanoparticles ◽  
Nucleation And Growth ◽  
Femtosecond Laser Irradiation ◽  
532 Nm ◽  
Polydisperse Particles ◽  
Autocatalytic Growth

Irradiation of aqueous [AuCl4]− with 532 nm, 8 ns pulses produces uniform 5 nm Au nanoparticles through surface plasmon-mediated photothermal autocatalytic growth, in contrast to the large polydisperse particles formed with 800 nm, 30 fs pulses.

scholarly journals Femtosecond laser induced synthesis of Au nanoparticles mediated by chitosan

2011 ◽  
Vol 20 (1) ◽  
pp. 518 ◽  
Author(s):  
P. H. D. Ferreira ◽  
M. G. Vivas ◽  
L. De Boni ◽  
D. S. dos Santos ◽  
D. T. Balogh ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Au Nanoparticles

Photoinduced formation of colloidal Au by a near-infrared femtosecond laser

2003 ◽  
Vol 18 (7) ◽  
pp. 1710-1714 ◽  
Author(s):  
Chongjun Zhao ◽  
Shiliang Qu ◽  
Jianrong Qiu ◽  
Congshan Zhu
Keyword(s):  
Femtosecond Laser ◽  
Absorption Spectra ◽  
Near Infrared ◽  
Au Nanoparticles ◽  
X Ray Diffraction ◽  
Local Formation ◽  
X Ray ◽  
Transmission Electron ◽  
Red Color ◽  
Yellow Orange

A Au colloid was prepared in a 5 mM HAuCl4 solution through irradiation with a focused infrared femtosecond laser at 800 nm. The Au colloid was characterized by absorption spectra, transmission electron microscopy, and x-ray diffraction analysis. The appearance of absorption peak around 526 nm in the absorption spectra and the wine-red color of sample solution HAuCl4 under focused laser irradiation verified the formation of Au colloid. The solution color changed in the order of yellow → orange → wine-red due to the local formation of Au nanoparticles near the focus. The pulse energy, focus position of laser beam, and solvent composite play important roles in formation, grain size, and stability of the Au colloid. A mechanism for the precipitate of Au nanoparticles was proposed, and a multiphoton process of femtosecond laser was involved.

Femtosecond laser synthesis of bimetallic Pt–Au nanoparticles

2011 ◽  
Vol 65 (4) ◽  
pp. 804-807 ◽  
Author(s):  
Joseph Lik Hang Chau ◽  
Chun-Yen Chen ◽  
Min-Chieh Yang ◽  
Kwang-Lung Lin ◽  
Shunichi Sato ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Au Nanoparticles ◽  
Laser Synthesis

scholarly journals Ultra-pure, water-dispersed Au nanoparticles produced by femtosecond laser ablation and fragmentation

2013 ◽  
pp. 2601 ◽  
Author(s):  
Saulius Juodkazis ◽  
Kubiliute ◽  
Lajevardipour ◽  
Yong ◽  
Jennifer Hartley ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Au Nanoparticles ◽  
Pure Water ◽  
Femtosecond Laser Ablation ◽  
Ultra Pure Water

Precipitation of Au nanoparticles induced in silicate glass by ultraviolet femtosecond laser

2015 ◽  
Author(s):  
Xiuzhang Tang ◽  
Qinfeng Wang ◽  
Xiaofei Lan ◽  
Leijian Wang ◽  
Zhixing Gao
Keyword(s):  
Femtosecond Laser ◽  
Silicate Glass ◽  
Au Nanoparticles
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