Defect mediated magnetic transitions in Fe and Mn doped MoS2

2018 ◽  
Vol 20 (23) ◽  
pp. 15817-15823 ◽  
Author(s):  
Manish Kumar Singh ◽  
Prajwal Chettri ◽  
Ajay Tripathi ◽  
Archana Tiwari ◽  
Bratindranath Mukherjee ◽  
...  
Keyword(s):  
Single Phase ◽  
Magnetic Transitions ◽  
Hydrothermal Route ◽  
Facile Hydrothermal Route ◽  
Fe And Mn ◽  
Mn Doped

We report single-phase syntheses of undoped 2H-MoS2 as well as Mn and Fe doped MoS2 by a facile hydrothermal route.

Hydrothermal synthesis of Mn-doped CdS hollow sphere nanocomposites as efficient visible-light driven photocatalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (20) ◽  
pp. 15110-15117 ◽  
Author(s):  
Chunyan Zhang ◽  
Jiasheng Lai ◽  
Juncheng Hu
Keyword(s):  
Hydrothermal Synthesis ◽  
Visible Light ◽  
Hollow Sphere ◽  
Hydrothermal Route ◽  
Facile Hydrothermal Route ◽  
Visible Light Driven ◽  
First Time ◽  
Mn Doped

A series of Mn-doped CdS hollow sphere photocatalysts has been directly synthesized by a simple and facile hydrothermal route for the first time.

scholarly journals Magnetic transitions and structural characteristics of Mn-doped α-Fe2O3/silica nanocomposites

AIP Advances ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 065313
Author(s):  
Hyon-Min Song ◽  
Ivo Atanasov ◽  
Jeffrey I. Zink
Keyword(s):  
Structural Characteristics ◽  
Magnetic Transitions ◽  
Silica Nanocomposites ◽  
Mn Doped

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.

Effect of hydrothermal dwell time on the diameter-controlled synthesis and magnetic property of MnO2 nanorods

2014 ◽  
Vol 28 (06) ◽  
pp. 1450045 ◽  
Author(s):  
Arbab Mohammad Toufiq ◽  
Fengping Wang ◽  
Qurat-ul-Ain Javed ◽  
Yan Li
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Dwell Time ◽  
Hydrothermal Reaction ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Transmission Electron ◽  
Facile Hydrothermal Route ◽  
Hydrothermal Reaction Time

In this paper, single crystalline 1D tetragonal MnO 2 pen-type nanorods were synthesized by varying the dwell time through a facile hydrothermal route at a reaction temperature of 250°C. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that the diameter of MnO 2 nanorods decreases from 460 nm to 250 nm with the increase in hydrothermal reaction time from 5 h to 15 h. Field-emission scanning electron microscopy (FESEM) and TEM studies revealed the evolution of improved surface morphology of MnO 2 nanorods that are prepared with longer hydrothermal reaction time. The magnetic properties of the products were evaluated using vibrating sample magnetometer (VSM) at room temperature, which showed that the as-prepared samples exhibit weak ferromagnetic behavior. The effect of diameter on the magnetization values was observed and discussed in detail.

Fabrication of Hexagonal Ni Micro/Nano Plates by a Facile Hydrothermal Reduction Route

2014 ◽  
Vol 898 ◽  
pp. 173-176
Author(s):  
Jun Zhang ◽  
Hai Rui Yao ◽  
Hua Bo Li ◽  
Jing Jing Li ◽  
Xiao Kang Bai
Keyword(s):  
Magnetic Hysteresis ◽  
Magnetic Hysteresis Loop ◽  
Face Centered Cubic ◽  
Hydrothermal Route ◽  
Nickel Metal ◽  
Structure Directing Agent ◽  
X Ray ◽  
Facile Hydrothermal Route ◽  
Face Centered ◽  
Hydrothermal Reduction

Hexagonal Ni micro/nanoplates were successfully prepared via a facile hydrothermal route using the polyvinylpyrrolidone as structure-directing agent. It has been verified from x-ray powder diffraction and transmission electronic microscopy that as-prepared products with high purity and fine dispersity belong to face-centered cubic microstructure of nickel metal. The magnetic hysteresis loop of the hexagonal Ni micro/nanoplates exhibits the ferromagnetic characteristics, and its coercivity increases by 25 % in comparison with the bulk nickel materials. The possible mechanism of the formation of hexagonal micro/nanoplates was suggested.

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

Hybrid ZnCo2O4@Co3S4 Nanowires for High-Performance Asymmetric Supercapacitors

2020 ◽  
Vol 15 (12) ◽  
pp. 1552-1558
Author(s):  
Yongli Tong ◽  
Xinyu Cheng ◽  
Dongli Qi ◽  
Baoqian Chi ◽  
Weiqiang Zhang
Keyword(s):  
High Performance ◽  
Reaction Path ◽  
Nickel Foam ◽  
Energy Storage Materials ◽  
Electrochemical Performances ◽  
Hydrothermal Route ◽  
Asymmetric Supercapacitors ◽  
High Area ◽  
Facile Hydrothermal Route

We successfully fabricate hierarchical ZnCo2O4@Co3S4 nanowires directly supported on nickel foam by a facile hydrothermal route. The as-synthesized product possesses large specific surface area and short reaction path, which result in superior electrochemical performances as the electrode of supercapacitor (SC). The obtained electrode material shows high area capacitance of 2.02 C g-1 at current density of 0.8 A g-1 with 95.3% retention of initial capacitance after 6000 cycles. Moreover, the assembled asymmetric supercapacitor (ASC) device using ZnCo2O4@Co3S4 nanowires as anode material displays noticeable electrochemical capability with an energy density of 79.8 mW h g-1 at power density of 1795 W kg-1 and 73.2 mW h g-1 at 9760 W kg-1. In addition, the device shows remarkable cycling capability, maintaining 82.2% retention after long-term cycles. It reveals the as-fabricated material would be promising energy storage materials.

scholarly journals Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

2019 ◽  
Vol 9 (8) ◽  
pp. 1519 ◽  
Author(s):  
Wenqing Dong ◽  
Kun Liang ◽  
Yanyi Qin ◽  
Huijia Ma ◽  
Xuan Zhao ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Adsorption Capacity ◽  
Red Mud ◽  
Maximum Adsorption Capacity ◽  
Magnetic Adsorbent ◽  
Hydrothermal Route ◽  
Hydrothermal Temperature ◽  
Facile Hydrothermal Route ◽  
Average Distribution ◽  
The Aluminum Industry

Red mud, a Fe-rich waste generated from the aluminum industry, was recovered as an adsorbent for wastewater treatment. The separation process of red mud from water after adsorption, including centrifugation and filtration, was complicated. This study demonstrated an alternative option to recycle red mud for preparing magnetic adsorbent via a facile hydrothermal route using ascorbic acid as reductant. Red mud is weakly magnetized and consists of andradite, muscovite, hematite, and cancrinite. After hydrothermal treatment, andradite in red mud was reductively dissolved by ascorbic acid, and transformed into magnetite and morimotoite. With increasing hydrothermal temperature, the dissolution of andradite accelerated, and the crystallite size of magnetite increased. When the hydrothermal temperature reached 200 °C, the prepared adsorbent P-200 showed a desirable saturation magnetization of 4.1 Am2/kg, and could be easily magnetically separated from water after adsorption. The maximum adsorption capacity of P-200 for Zn2+ was 89.6 mg/g, which is eight-fold higher than that of the raw red mud. The adsorption of Zn2+ by P-200 fitted the Langmuir model, where cation exchange was the main adsorption mechanism. The average distribution coefficient of Zn2+ at low ppm level was 16.81 L/g for P-200, higher than those of the red mud (0.3 L/g) and the prepared P-120 (1.48 L/g) and P-270 (5.48 L/g), demonstrating that P-200 had the best adsorption capacity for Zn2+ and can be served as a practical adsorbent for real-world applications. To our knowledge, this is the first study to report the conversion of red mud into a magnetic adsorbent under mild conditions.

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