Hydrothermal Synthesis of Bi1.5ZnNb1.5O7 Nanopowders

2007 ◽  
Vol 561-565 ◽  
pp. 495-498 ◽  
Author(s):  
Jin Liang Huang ◽  
Xiao Wang ◽  
Liu Shuan Yang ◽  
Chun Wei Cui ◽  
Xing Hua Yang
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Pyrochlore Phase ◽  
Synthesis Temperature ◽  
Minimum Size ◽  
Hydrothermal Reactions ◽  
Prolonged Reaction Time ◽  
Scherrer Equation ◽  
Xrd Patterns

The cubic pyrochlore phase Bi1.5ZnNb1.5O7 nanopowder was successfully synthesized by the hydrothermal method (HTM) from the starting materials: Bi(NO3)3·5H2O, ZnO, Nb2O5 and the mineralizer: KOH. The XRD patterns prove that the cubic pyrochlore phase Bi1.5ZnNb1.5O7 nanopowder can be obtained by HTM, and TEM photographs show that the powders present the regularly granular shape, when the hydrothermal reactions were conducted at synthesis temperatures 140~220°C and reaction time for 6~48h. The crystalline sizes of the powders were calculated by the Scherrer equation to be about 43~49nm. The crystalline sizes decreased both with the increase in synthesis temperature and the prolonged reaction time until they reached to the minimum size about 43nm at 220°C for 24h.However, they tended to increase when the reaction time was above 24h.

scholarly journals The Study on hydrothermal synthesis of ZrO2 nanofibers under different conditions

2021 ◽  
Vol 236 ◽  
pp. 01038
Author(s):  
Lingna Xu ◽  
Yifan Cheng ◽  
Tianen Chen ◽  
Rong Mao ◽  
Zhong Han
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Growth Mechanism ◽  
Traditional Method ◽  
Active Surface ◽  
Organic Additives ◽  
Preparation Methods ◽  
Catalyst Carrier ◽  
Traditional Preparation

Nano-ZrO2 has a high atomic active surface and is used as catalyst carrier. The traditional method of preparing ZrO2 nanofibers is electrostatic spinning, which has the problems of high cost and high equipment requirements. In order to solve the shortcomings of traditional preparation methods and prepare excellent ZrO2 nanofibers, a series of ZrO2 nanofibers were prepared based on hydrothermal method by changing the types of reactants, the ratio of reactants to organic additives, solvents, reaction time and other relevant parameters, to explore the growth mechanism of ZrO2 nanofibers, providing a new idea for the preparation of ZrO2 nanofibers on the active surface of altiplano.

Hydrothermal synthesis for the enhanced red and green Sr3Y(PO4)3:Eu3+, Tb3+ phosphors

2019 ◽  
Vol 33 (05) ◽  
pp. 1950048 ◽  
Author(s):  
Liyong Wang ◽  
Xue Wang ◽  
Qingwei Song ◽  
Tianying Xie ◽  
Xiaoqing Guo ◽  
...  
Keyword(s):  
Optical Properties ◽  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Light Emitting Diodes ◽  
Green Emission ◽  
Structural And Optical Properties ◽  
Light Emitting ◽  
Pl Spectra

A series of enhanced red and green emission phosphors: [Formula: see text] (SYP): [Formula: see text], [Formula: see text] were successfully synthesized via a novel hydrothermal method. The structural and optical properties were investigated through XRD and PL (photoluminescence) measurements. The results of PL spectra revealed that SYP exhibited red and green emission for [Formula: see text], [Formula: see text]-phosphors doped, respectively. In order to obtain optimal phosphors, we proposed the concentration of dopants and the reaction time. Results indicated that enhanced red and green emission phosphors SYP may be potential candidates in light-emitting diodes (LEDs).

P-type conducting transparent characteristics of delafossite Ca doped CuScO2 prepared by hydrothermal synthesis

2021 ◽  
Author(s):  
Han Gao ◽  
Xianwei Zeng ◽  
Qiang Guo ◽  
Zhi Yang ◽  
Yanwen Deng ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Delafossite Oxides ◽  
P Type

Ca doped CuScO2 (CSO) delafossite oxides with 3-4 μm were synthesized through hydrothermal method using Cu(NO3)2•3H2O, Sc(NO3)3•xH2O as precursor at 240 °C for 24 h in this work. The influence...

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.

Rapid microwave assisted hydrothermal synthesis of porous α-Fe2O3 nanostructures as stable and high capacity negative electrode for lithium and sodium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (44) ◽  
pp. 34761-34768 ◽  
Author(s):  
B. Nageswara Rao ◽  
P. Ramesh Kumar ◽  
O. Padmaraj ◽  
M. Venkateswarlu ◽  
N. Satyanarayana
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
High Capacity ◽  
Negative Electrode ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Base Catalyst ◽  
Microwave Assisted

Porous α-Fe2O3 nanostructures were developed in the presence of a base catalyst by a rapid microwave assisted hydrothermal method.

Hydrothermal synthesis of Pt–Ag alloy nano-octahedra and their enhanced electrocatalytic activity for the methanol oxidation reaction

Nanoscale ◽  
2014 ◽  
Vol 6 (21) ◽  
pp. 12310-12314 ◽  
Author(s):  
Geng-Tao Fu ◽  
Ru-Guang Ma ◽  
Xue-Qing Gao ◽  
Yu Chen ◽  
Ya-Wen Tang ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Methanol Oxidation ◽  
Electrocatalytic Activity ◽  
Oxidation Reaction ◽  
Methanol Oxidation Reaction ◽  
High Quality ◽  
One Pot

High-quality Pt48Ag52 alloy nano-octahedra are synthesized via one-pot hydrothermal method showing excellent electrocatalytic activity and stability for methanol oxidation reaction.

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