scholarly journals Spectroscopic Analysis of Au-Cu Alloy Nanoparticles of Various Compositions Synthesized by a Chemical Reduction Method

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Latif-ur-Rahman ◽  
Afzal Shah ◽  
Rumana Qureshi ◽  
Sher Bahadar Khan ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
Reduction Method ◽  
Chemical Reduction ◽  
Average Diameter ◽  
Alloy Nanoparticles ◽  
X Ray Diffraction ◽  
Chemical Reduction Method ◽  
Cu Alloy ◽  
Sem And Tem ◽  
Number Of Binding Sites ◽  
Free Energy Of Binding

Au-Cu alloy nanoparticles were synthesized by a chemical reduction method. Five samples having different compositions of Au and Cu (Au-Cu 3 : 1, Au-Cu 2 : 1, Au-Cu 1 : 1, Au-Cu 1 : 2, and Au-Cu 1 : 3) were prepared. The newly synthesized nanoparticles were characterized by electronic absorption, fluorescence, and X-ray diffraction spectroscopy (XRD). These alloy nanoparticles were also analyzed by SEM and TEM. The particle size was determined by SEM and TEM and calculated by Debye Scherrer’s equation as well. The results revealed that the average diameter of nanoparticles gets lowered from 80 to 65 nm as the amount of Cu is increased in alloy nanoparticles. Some physical properties were found to change with change in molar composition of Au and Cu. Most of the properties showed optimum values for Au-Cu alloy nanoparticles of 1 : 3. Cu in Au-Cu alloy caused decrease in the intensity of the emission peak and acted as a quencher. The fluorescence data was utilized for the evaluation of number of binding sites, total number of atoms in alloy nanoparticle, binding constant, and free energy of binding while morphology was deduced from SEM and TEM.

Synthesis of CuxNi1−x alloy nanoparticles from double complex salts and investigation of their magnetoimpedance effects

RSC Advances ◽  
2015 ◽  
Vol 5 (88) ◽  
pp. 71601-71607 ◽  
Author(s):  
Seyed Abolghasem Kahani ◽  
Mansoure Shahrokh
Keyword(s):  
Reduction Method ◽  
Chemical Reduction ◽  
Alloy Nanoparticles ◽  
Chemical Reduction Method ◽  
Double Complex ◽  
Double Complex Salts ◽  
Complex Salts

This work is a novel study of the synthesis of CuxNi1−x nanoalloy from double complex salts by chemical reduction method.

The Synthesis and Characterization of Oxide Free Tin Nanoparticles

2014 ◽  
Vol 670-671 ◽  
pp. 26-29
Author(s):  
Zhi Long Pan ◽  
Shi Liang Ao ◽  
Jian Ping Jia
Keyword(s):  
Reduction Method ◽  
Chemical Reduction ◽  
Thermal Characterization ◽  
X Ray Diffraction ◽  
Chemical Reduction Method ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Xrd Study ◽  
Tin Nanoparticles

Oxide free Tin nanoparticles were synthesized from a chemical reduction method. Their morphological and thermal characterizations were studied in this paper. The X-ray diffraction (XRD) study showed that no oxides of Tin nanoparticles were formed. The thermal characterization by differential scanning calorimetry (DSC) exhibited the size dependency of the melting points. The melting point was as low as 202.16°C.

Preparation and characterization of Cu–Co alloy nanoparticles from double complex salts by chemical reduction

2015 ◽  
Vol 39 (10) ◽  
pp. 7916-7922 ◽  
Author(s):  
Seyed Abolghasem Kahani ◽  
Mansoure Shahrokh
Keyword(s):  
Reduction Method ◽  
Chemical Reduction ◽  
Alloy Nanoparticles ◽  
Chemical Reduction Method ◽  
Double Complex ◽  
Double Complex Salts ◽  
Complex Salts

This work is a novel study of the synthesis of Cu–Co nanoalloy from double complex salts by chemical reduction method.

scholarly journals Glycerol Valorization over ZrO2-Supported Copper Nanoparticles Catalysts Prepared by Chemical Reduction Method

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1040
Author(s):  
Juan Garcés ◽  
Ramón Arrué ◽  
Néstor Novoa ◽  
Andreia F. Peixoto ◽  
Ricardo J. Chimentão
Keyword(s):  
Copper Nanoparticles ◽  
Reduction Method ◽  
Chemical Reduction ◽  
X Ray Diffraction ◽  
Chemical Reduction Method ◽  
X Ray ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Region I ◽  
Temperature Programmed

Copper nanoparticles (NPs) and ZrO2-supported copper NPs (Cu NPs/ZrO2) were synthesized via a chemical reduction method applying different pH (4, 7 and 9) and evaluated in a glycerol dehydration reaction. Copper NPs were characterized with transmission electron microscopy (TEM) and UV–vis spectroscopy. Transmission electron microcopy (TEM) results revealed a homogeneous distribution of copper NPs. A hypsochromic shift was identified with UV–vis spectroscopy as the pH of the synthesis increased from pH = 4 to pH = 9. Zirconia-supported copper NPs catalysts were characterized using N2 physisorption, X-ray diffraction (XRD), TEM, X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), temperature-programmed desorption of ammonia (NH3-TPD) and N2O chemisorption. The presence of ZrO2 in the chemical reduction method confirmed the dispersion of the copper nanoparticles. X-ray diffraction indicated only the presence of tetragonal zirconia patterns in the catalysts. XPS identified the Cu/Zr surface atomic ratio of the catalysts. TPR patterns showed two main peaks for the Cu NPS/ZrO2 pH = 9 catalyst; the first peak between 125 and 180 °C (region I) was ascribed to more dispersed copper species, and the second one between 180 and 250 °C (region II) was assigned to bulk CuO. The catalysts prepared at pH = 4 and pH = 7 only revealed reduction at lower temperatures (region I). Copper dispersion was determined by N2O chemisorption. With NH3-TPD it was found that Cu NPs/ZrO2 pH = 9 exhibited the highest total quantity of acidic sites and the highest apparent kinetic constant, with a value of 0.004 min−1. The different pH applied to the synthesis media of the copper nanoparticles determined the resultant copper dispersion on the ZrO2 support, providing active domains for glycerol conversion.

scholarly journals Using silver nanoparticles for the increase of YAG: Ce luminescence

2021 ◽  
Vol 2094 (2) ◽  
pp. 022021
Author(s):  
A A Kravtsov ◽  
I S Chikulina ◽  
S N Kichuk ◽  
V A Tarala ◽  
M S Nikova ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Luminescence Intensity ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Reference Sample ◽  
Average Diameter ◽  
Inert Atmosphere ◽  
Chemical Reduction Method ◽  
Two Stage ◽  
Direct Addition

Abstract In this study, silver nanoparticles with an average diameter of 50-70 nm were synthesized by the chemical reduction method. Subsequently, nanoparticles in different concentrations were introduced into the YAG: Ce luminescent powder synthesized by the method of two-stage coprecipitation into hexamine. The luminescence of samples with different contents of nanosilver was investigated. It was shown that the direct addition of nanosilver to YAG: Ce significantly impairs luminescence. Upon calcination at 900 °C, an increase in the luminescence of the YAG: Ce samples with silver nanoparticles was observed; however, the luminescence intensity was lower than that of the reference sample (without nanosilver). After calcination in an inert atmosphere at a temperature of 1550 °C, a significant increase in the luminescence intensity (of the order of 30-40 %) of the samples with the addition of a nanosilver was observed in comparison with the reference sample. Thus, silver nanoparticles can be successfully used to improve the YAG: Ce phosphors.

scholarly journals Investigating the Formation Process of Sn-Based Lead-Free Nanoparticles with a Chemical Reduction Method

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Weipeng Zhang ◽  
Bingge Zhao ◽  
Changdong Zou ◽  
Qijie Zhai ◽  
Yulai Gao ◽  
...  
Keyword(s):  
Formation Process ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Lead Free ◽  
X Ray Diffraction ◽  
Chemical Reduction Method ◽  
Contributing Factors ◽  
Nucleation And Growth Mechanisms ◽  
The Difference ◽  
Free Solder

Nanoparticles of a promising lead-free solder alloy (Sn3.5Ag (wt.%, SnAg) and Sn3.0Ag0.5Cu (wt.%, SAC)) were synthesized through a chemical reduction method by using anhydrous ethanol and 1,10-phenanthroline as the solvent and surfactant, respectively. To illustrate the formation process of Sn-Ag alloy based nanoparticles during the reaction, X-ray diffraction (XRD) was used to investigate the phases of the samples in relation to the reaction time. Different nucleation and growth mechanisms were compared on the formation process of the synthesized nanoparticles. The XRD results revealed different reaction process compared with other researchers. There were many contributing factors to the difference in the examples found in the literature, with the main focus on the formation mechanism of crystal nuclei, the solubility and ionizability of metal salts in the solvent, the solid solubility of Cu in Ag nuclei, and the role of surfactant on the growth process. This study will help define the parameters necessary for the control of both the composition and size of the nanoparticles.

Sign in / Sign up

Export Citation Format

Share Document