Hierarchically porous Co3O4 film prepared by hydrothermal synthesis method based on colloidal crystal template for supercapacitor application

2012 ◽  
Vol 64 ◽  
pp. 154-161 ◽  
Author(s):  
B.R. Duan ◽  
Q. Cao
Keyword(s):  
Hydrothermal Synthesis ◽  
Colloidal Crystal ◽  
Synthesis Method ◽  
Hierarchically Porous ◽  
Supercapacitor Application ◽  
Colloidal Crystal Template

scholarly journals Sol-Gel Synthesis of the Double Perovskite Sr2FeMoO6 by Microwave Technique

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3876
Author(s):  
Jesús Valdés ◽  
Daniel Reséndiz ◽  
Ángeles Cuán ◽  
Rufino Nava ◽  
Bertha Aguilar ◽  
...  
Keyword(s):  
Particle Size ◽  
Hydrothermal Synthesis ◽  
Microwave Radiation ◽  
Structural Characteristics ◽  
Sol Gel ◽  
Synthesis Method ◽  
Double Perovskite ◽  
Synthesis Methods ◽  
X Ray ◽  
Sol Gel Synthesis

The effect of microwave radiation on the hydrothermal synthesis of the double perovskite Sr2FeMoO6 has been studied based on a comparison of the particle size and structural characteristics of products from both methods. A temperature, pressure, and pH condition screening was performed, and the most representative results of these are herein presented and discussed. Radiation of microwaves in the hydrothermal synthesis method led to a decrease in crystallite size, which is an effect from the reaction temperature. The particle size ranged from 378 to 318 nm when pH was 4.5 and pressure was kept under 40 bars. According to X-ray diffraction (XRD) results coupled with the size-strain plot method, the product obtained by both synthesis methods (with and without microwave radiation) have similar crystal purity. The Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques showed that the morphology and the distribution of metal ions are uniform. The Curie temperature obtained by thermogravimetric analysis indicates that, in the presence of microwaves, the value was higher with respect to traditional synthesis from 335 K to 342.5 K. Consequently, microwave radiation enhances the diffusion and nucleation process of ionic precursors during the synthesis, which promotes a uniform heating in the reaction mixture leading to a reduction in the particle size, but keeping good crystallinity of the double perovskite. Precursor phases and the final purity of the Sr2FeMoO6 powder can be controlled via hydrothermal microwave heating on the first stages of the Sol-Gel method.

scholarly journals Microwave-Assisted vs. Conventional Hydrothermal Synthesis of MoS2 Nanosheets: Application towards Hydrogen Evolution Reaction

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1040 ◽  
Author(s):  
Getachew Solomon ◽  
Raffaello Mazzaro ◽  
Vittorio Morandi ◽  
Isabella Concina ◽  
Alberto Vomiero
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Crystal Morphology ◽  
Synthesis Method ◽  
Synthesis Methods ◽  
Mos2 Nanosheets ◽  
Microwave Assisted

Molybdenum sulfide (MoS2) has emerged as a promising catalyst for hydrogen evolution applications. The synthesis method mainly employed is a conventional hydrothermal method. This method requires a longer time compared to other methods such as microwave synthesis methods. There is a lack of comparison of the two synthesis methods in terms of crystal morphology and its electrochemical activities. In this work, MoS2 nanosheets are synthesized using both hydrothermal (HT-MoS2) and advanced microwave methods (MW-MoS2), their crystal morphology, and catalytical efficiency towards hydrogen evolution reaction (HER) were compared. MoS2 nanosheet is obtained using microwave-assisted synthesis in a very short time (30 min) compared to the 24 h hydrothermal synthesis method. Both methods produce thin and aggregated nanosheets. However, the nanosheets synthesized by the microwave method have a less crumpled structure and smoother edges compared to the hydrothermal method. The as-prepared nanosheets are tested and used as a catalyst for hydrogen evolution results in nearly similar electrocatalytic performance. Experimental results showed that: HT-MoS2 displays a current density of 10 mA/cm2 at overpotential (−280 mV) compared to MW-MoS2 which requires −320 mV to produce a similar current density, suggesting that the HT-MoS2 more active towards hydrogen evolutions reaction.

Enhancement of blue emission in β-NaYbF4:Tm3+/Nd3+ nanophosphors synthesized by nonclosed hydrothermal synthesis method

2010 ◽  
Vol 101 (3) ◽  
pp. 623-629 ◽  
Author(s):  
X. F. Wang ◽  
X. H. Yan ◽  
C. X. Kan ◽  
K. L. Ma ◽  
Y. Xiao ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Synthesis Method ◽  
Blue Emission

Hydrothermal synthesis of novel photosensitive gold and silver bimetallic nanoclusters protected by adenosine monophosphate (AMP)

2017 ◽  
Vol 5 (38) ◽  
pp. 9979-9985 ◽  
Author(s):  
Jiao Liu ◽  
Xin-Xin Yuan ◽  
Hong-Wei Li ◽  
Yuqing Wu
Keyword(s):  
Hydrothermal Synthesis ◽  
Quantum Yield ◽  
Synthesis Method ◽  
Adenosine Monophosphate ◽  
High Quantum Yield ◽  
High Quantum ◽  
Luminescence Emission ◽  
Bimetallic Nanoclusters ◽  
Strong Luminescence

AMP-capped gold and silver bimetal nanoclusters, Au–AgNCs@AMP, showing strong luminescence emission with a high quantum yield (QY = 8.46%) and novel photosensitivity, have been prepared using the hydrothermal synthesis method.

Germanium FCC Structure from a Colloidal Crystal Template

Langmuir ◽  
2000 ◽  
Vol 16 (10) ◽  
pp. 4405-4408 ◽  
Author(s):  
H. Míguez ◽  
F. Meseguer ◽  
C. López ◽  
M. Holgado ◽  
G. Andreasen ◽  
...  
Keyword(s):  
Colloidal Crystal ◽  
Colloidal Crystal Template ◽  
Fcc Structure

DNA assisted synthesis of CeO2 nanocrystals with enhanced peroxidase-like activity

CrystEngComm ◽  
2018 ◽  
Vol 20 (29) ◽  
pp. 4075-4079 ◽  
Author(s):  
Meng Wang ◽  
Mei-Fang Wang ◽  
Yi-Ming Wang ◽  
Ji-Wei Shen ◽  
Zhi-Ying Wang ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Synthesis Method

We have synthesized a series of CeO2 nanocrystals in different sizes with DNA as the template by a hydrothermal synthesis method.

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