Size control of monodisperse Au nanoparticles synthesized via a citrate reduction process associated with a pH-shifting procedure

CrystEngComm ◽  
2013 ◽  
Vol 15 (42) ◽  
pp. 8412 ◽  
Author(s):  
Fumiyuki Shiba
Keyword(s):  
Au Nanoparticles ◽  
Size Control ◽  
Reduction Process ◽  
Ph Shifting ◽  
Citrate Reduction

scholarly journals Size Control of Synthesized Silver Nanoparticles by Simultaneous Chemical Reduction and Laser Fragmentation in Origanum majorana Extract: Antibacterial Application

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2326
Author(s):  
Entesar Ali Ganash ◽  
Reem Mohammad Altuwirqi
Keyword(s):  
Silver Nanoparticles ◽  
Irradiation Time ◽  
Chemical Reduction ◽  
Size Control ◽  
Reduction Process ◽  
Laser Wavelength ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Transmission Electron ◽  
Origanum Majorana

In this work, silver nanoparticles (Ag NPs) were synthesized using a chemical reduction approach and a pulsed laser fragmentation in liquid (PLFL) technique, simultaneously. A laser wavelength of 532 nm was focused on the as produced Ag NPs, suspended in an Origanum majorana extract solution, with the aim of controlling their size. The effect of liquid medium concentration and irradiation time on the properties of the fabricated NPs was studied. While the X-ray diffraction (XRD) pattern confirmed the existence of Ag NPs, the UV–Vis spectrophotometry showed a significant absorption peak at about 420 nm, which is attributed to the characteristic surface plasmon resonance (SPR) peak of the obtained Ag NPs. By increasing the irradiation time and the Origanum majora extract concentration, the SPR peak shifted toward a shorter wavelength. This shift indicates a reduction in the NPs’ size. The effect of PLFL on size reduction was clearly revealed from the transmission electron microscopy images. The PLFL technique, depending on experimental parameters, reduced the size of the obtained Ag NPs to less than 10 nm. The mean zeta potential of the fabricated Ag NPs was found to be greater than −30 mV, signifying their stability. The Ag NPs were also found to effectively inhibit bacterial activity. The PLFL technique has proved to be a powerful method for controlling the size of NPs when it is simultaneously associated with a chemical reduction process.

scholarly journals Synthesis of Copper Nanoparticles Using Glass Microfluidic Device

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1110
Author(s):  
Yiyang Liang ◽  
Yoko Shinozaki ◽  
Hiromasa Yagyu
Keyword(s):  
Particle Size ◽  
Ascorbic Acid ◽  
Microfluidic Device ◽  
Copper Nanoparticles ◽  
Flow Rate ◽  
Control Method ◽  
Size Control ◽  
Metallic Materials ◽  
First Time ◽  
Citrate Reduction

In a synthesis of gold nanoparticles on a microfluidic device by citrate reduction, a particle size control by changing a flow rate was reported. To apply this simple control method to the synthesis of other metallic materials, we propose the synthesis of copper nanoparticles (CuNPs) in ethylene glycol by the microfluidic device using ascorbic acid as both antioxidant and reducing agent. The experimental results found for the first time that the effect of the flow rate of agents on particle size of the synthesized CuNPs in the device.

Size Control and Characterization of Sn-Ag-Cu Lead-Free Nanosolders by a Chemical Reduction Process

2011 ◽  
Vol 41 (2) ◽  
pp. 313-321 ◽  
Author(s):  
K.C. Yung ◽  
C.M.T. Law ◽  
C.P. Lee ◽  
B. Cheung ◽  
T.M. Yue
Keyword(s):  
Chemical Reduction ◽  
Size Control ◽  
Reduction Process ◽  
Lead Free

Size Control of Monodisperse Au Nanoparticles: Controlling Role of Polyoxometalate [SiW9O34]10–

2020 ◽  
Vol 65 (8) ◽  
pp. 1276-1281
Author(s):  
R. X. Tan ◽  
Q. H. Wang ◽  
T. X. Xiao ◽  
J. Meng
Keyword(s):  
Au Nanoparticles ◽  
Size Control

Photocatalytic Reduction of CO2 on Au/TiO2 Nanocomposite Film

2014 ◽  
Vol 953-954 ◽  
pp. 995-998 ◽  
Author(s):  
Shuo Wang ◽  
Yi Chen Li ◽  
Chao Song ◽  
En Zhou Liu ◽  
Jun Fan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Absorption Spectrum ◽  
Photoluminescence Spectrum ◽  
Au Nanoparticles ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Photocatalytic Reduction ◽  
Microwave Assisted ◽  
Scanning Electron

Plasmonic Au decorated TiO2 nanosheet film was firstly prepared by the combination of a hydrothermal method and a microwave-assisted chemical reduction process. The prepared sample was characterized by scanning electron microscopy (SEM), UV-vis absorption spectrum (UV-vis) and photoluminescence spectrum (PL) respectively. Results show that Au nanoparticles with narrow distribution are uniformly loaded on the nanosheet surface, and the resulted composite nanostructure exhibits distinct surface plasmon absorption and quenched photoluminescence compared to pure TiO2 nanostructure. Photocatalytic tests show that Au decorated TiO2 exhibits enhanced photocatalytic activity for photocatalytic reduction of CO2 to methanol.

Decorating Polypyrrole Nanotubes with Au Nanoparticles by an In Situ Reduction Process

2009 ◽  
Vol 30 (11) ◽  
pp. 936-940 ◽  
Author(s):  
Jingjing Xu ◽  
Jianchen Hu ◽  
Baogang Quan ◽  
Zhixiang Wei
Keyword(s):  
Au Nanoparticles ◽  
Reduction Process ◽  
In Situ Reduction ◽  
Polypyrrole Nanotubes
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