scholarly journals Controlled Synthesis of Manganese Dioxide Nanostructures via a Facile Hydrothermal Route

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Suh Cem Pang ◽  
Suk Fun Chin ◽  
Chian Ye Ling
Keyword(s):  
Phase Transformation ◽  
Manganese Dioxide ◽  
Structural Evolution ◽  
Controlled Synthesis ◽  
Hydrothermal Route ◽  
Hydrothermal Aging ◽  
Synthesis Parameters ◽  
Facile Hydrothermal Route ◽  
Lower Temperature ◽  
And Control

Manganese dioxide nanostructures with controllable morphological structures and crystalline phases were synthesized via a facile hydrothermal route at low temperatures without using any templates or surfactants. Both the aging duration and aging temperatures were the main synthesis parameters used to influence and control the rate of morphological and structural evolution of MnO2nanostructures. MnO2nanostructures comprise of spherical nanoparticulate agglomerates and highly amorphous in nature were formed at lower temperature and/or short aging duration. In contrast, MnO2nanostructures of sea-urchin-like and nanorods-like morphologies and nanocrystalline in nature were prepared at the combined higher aging temperatures and longer aging durations. These nanostructures underwent notable phase transformation from δ-MnO2to α-MnO2upon prolonged hydrothermal aging duration and exhibited accelerated rate of phase transformation at higher aging temperature.

scholarly journals Manganese Dioxide Nanowires of Tunable Dimensions Synthesized via a Facile Hydrothermal Route

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Ying Ying Kong ◽  
Suh Cem Pang ◽  
Suk Fun Chin
Keyword(s):  
Manganese Dioxide ◽  
Reaction Temperature ◽  
Homogeneous Solution ◽  
Hydrothermal Route ◽  
Initial Concentration ◽  
Aspect Ratios ◽  
Synthesis Parameters ◽  
Facile Hydrothermal Route ◽  
Mean Diameter ◽  
The Mean

Manganese dioxide (MnO2) nanowires of tunable dimensions were successfully synthesized via the facile water-bathing hydrothermal route. Homogeneous solution mixtures of KMnO4and MnSO4of varying compositions were being aged in a thermostated water bath under controlled conditions. The dimensional aspect ratios of MnO2nanowires formed were readily modulated by varying synthesis parameters such as the initial concentration of chemical precursors, reaction temperature, and aging duration. At fixed initial precursor concentrations, the mean diameter of MnO2nanowires decreased slightly from 57 nm to 53 nm with increased reaction temperature from 60°C to 90°C. The mean diameter of MnO2nanowires decreased linearly within the range of 104 nm and 35 nm as the initial concentration of both precursors was increased in turn within the range of 10 mmol and 40 mmol at fixed aging temperature and duration. Upon aging for 2 to 24 hours at 80°C, the mean diameter and length of MnO2nanowires were observed to vary within the range of 33–55 nm and 0.69–2.68 μm, respectively, which corresponded to the dimensional aspect ratio range of 21 to 49. Henceforth, MnO2nanowires of tunable dimensions could be synthesized through optimally controlled synthesis parameters.

Controlled Synthesis of Cobalt Flowerlike Architectures by a Facile Hydrothermal Route

2008 ◽  
Vol 2008 (17) ◽  
pp. 2733-2738 ◽  
Author(s):  
Ya-jing Zhang ◽  
Ying Zhang ◽  
Zhen-hua Wang ◽  
Da Li ◽  
Tie-yu Cui ◽  
...  
Keyword(s):  
Controlled Synthesis ◽  
Hydrothermal Route ◽  
Facile Hydrothermal Route

Morphology-tunable synthesis of ZnO nanoforest and its photoelectrochemical performance

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 8769-8780 ◽  
Author(s):  
Xing Sun ◽  
Qiang Li ◽  
Jiechao Jiang ◽  
Yuanbing Mao
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Controlled Synthesis ◽  
Zno Nanostructures ◽  
Photoelectrochemical Performance ◽  
Hydrothermal Route ◽  
Facile Hydrothermal Route ◽  
Architectural Characteristics

The morphology-controlled synthesis of ZnO nanoforests is achieved via a facile hydrothermal route based on the respective and synergistic influence of polyethylenimine (PEI) and ammonia. More importantly, the unique architectural characteristics endow the willow-like ZnO nanoforest with prominent photoelectrochemical water splitting performance, which leads to the realm of homogeneous ZnO nanostructures.

scholarly journals Facile hydrothermal route to the controlled synthesis of α-Fe2O3 1-D nanostructures

2008 ◽  
Vol 31 (7) ◽  
pp. 919-923 ◽  
Author(s):  
Lixia Yang ◽  
Ying Liang ◽  
Hou Chen ◽  
Lingyan Kong ◽  
Wei Jiang
Keyword(s):  
Controlled Synthesis ◽  
Hydrothermal Route ◽  
Facile Hydrothermal Route

In situ controlled synthesis of various TiO2 nanostructured materials via a facile hydrothermal route

2010 ◽  
Vol 13 (5) ◽  
pp. 1855-1863 ◽  
Author(s):  
Hai Wang ◽  
Yong Liu ◽  
Minyi Zhong ◽  
Hongmei Xu ◽  
Hong Huang ◽  
...  
Keyword(s):  
Nanostructured Materials ◽  
Controlled Synthesis ◽  
Hydrothermal Route ◽  
Facile Hydrothermal Route

PEG-Assisted Hydrothermal Synthesis and Photocatalytic Activity of Bi2Fe4O9 Crystallites

2011 ◽  
Vol 1292 ◽  
Author(s):  
Dengrong Cai ◽  
Jianmin Li ◽  
Shundong Bu ◽  
Shengwen Yu ◽  
Dengren Jin ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance Spectrum ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Peg 400 ◽  
Transmission Electron ◽  
Light Region ◽  
Facile Hydrothermal Route ◽  
Degradation Ratio

ABSTRACTA facile hydrothermal route assisted by polyethylene glycol (PEG) 400 was utilized to synthesize single-phase Bi2Fe4O9 crystallites. X-ray diffraction results showed the products with PEG 400 of 30 g/L exhibited a preferred growth along the (001) plane. Transmission electron microscopy indicated that the morphology of the as-prepared Bi2Fe4O9 crystallites with PEG 400 were plake-like and rod-like. Strong absorption in visible-light region of the products was characterized by UV-vis diffuse reflectance spectrum (UV-DRS). The photocatalytic activity of Bi2Fe4O9 crystallites was evaluated on degradation of methyl orange (MO) under visible light irradiation. For 3 h irradiation, the degradation ratio was increased to 93% with the aid of a small amount of H2O2. The analysis of FT-IR spectra proved that the Bi2Fe4O9 catalysts were remained stable after the photocalytic reactions.

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