A low temperature bottom-up approach for the synthesis of few layered graphene nanosheets via C–C bond formation using a modified Ullmann reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (58) ◽  
pp. 46589-46597 ◽  
Author(s):  
Sandesh Y. Sawant ◽  
Rajesh S. Somani ◽  
Moo Hwan Cho ◽  
Hari C. Bajaj
Keyword(s):  
Low Temperature ◽  
Graphene Nanosheets ◽  
Bond Formation ◽  
Graphene Sheets ◽  
Bottom Up ◽  
Ullmann Reaction

A low temperature, single-pot, bottom-up approach for the synthesis of few layered graphene sheets using the modified Ullmann reaction is reported.

scholarly journals Solution-Processable Porous Graphitic Carbon from Bottom-Up Synthesis and Low-Temperature Graphitization

2021 ◽  
Author(s):  
Sai Che ◽  
Lei Fang ◽  
Sarbajit Banerjee ◽  
Mohammed Al-Hashimi ◽  
Zi-Hao Guo ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Porous Graphitic Carbon ◽  
Graphitic Carbon ◽  
Bottom Up ◽  
Solution Processable

It is urgently desired yet challenging to synthesize porous graphitic carbon (PGC) in a bottom-up manner while circumventing the need for high-temperature pyrolysis. Here we present an effective and scalable...

scholarly journals Multishelled NiO Hollow Spheres Decorated by Graphene Nanosheets as Anodes for Lithium-Ion Batteries with Improved Reversible Capacity and Cycling Stability

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Lihua Chu ◽  
Meicheng Li ◽  
Yu Wang ◽  
Xiaodan Li ◽  
Zipei Wan ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Graphene Nanosheets ◽  
Hollow Spheres ◽  
Modern Science ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Graphene Sheets ◽  
Reduced Graphene ◽  
Graphene Nanocomposite ◽  
A Current

Graphene-based nanocomposites attract many attentions because of holding promise for many applications. In this work, multishelled NiO hollow spheres decorated by graphene nanosheets nanocomposite are successfully fabricated. The multishelled NiO microspheres are uniformly distributed on the surface of graphene, which is helpful for preventing aggregation of as-reduced graphene sheets. Furthermore, the NiO/graphene nanocomposite shows much higher electrochemical performance with a reversible capacity of 261.5 mAh g−1at a current density of 200 mA g−1after 100 cycles tripled compared with that of pristine multishelled NiO hollow spheres, implying the potential application in modern science and technology.

Preparation and Characterization of In Situ Nanocomposites of Graphene Nanosheets/Polyurethane

2019 ◽  
Vol 814 ◽  
pp. 90-95 ◽  
Author(s):  
Guang Lei Lv ◽  
Yuan Yuan Li ◽  
Chen Fei ◽  
Zhi Hao Shan ◽  
Jing Gan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Graphene Nanosheets ◽  
Graphene Sheets ◽  
Microstructural Properties ◽  
Wear Performance ◽  
Polyurethane Composites

Graphene nanosheets/polyurethane (GNS/PU) was prepared in situ by polymerization technique for the manufacture of PU safety shoes soles. The graphene nanosheets/polyurethane composites were characterized for their mechanical properties, thermal conductivity and abrasion resistance, and comparison is made with those of the neat polyurethane. The microstructural properties of GNS/PU were characterized by SEM. The results show that with the increase of the amount of graphene within the range of weight-percentages analyzed, the tensile strength of the composites gradually increases. The tensile strength of the GNS/PU composites increased to 64.14 MPa with 2 wt% GNS, compared with 55.1 MPa for neat PU. When the graphene sheets reached 2 wt%, the abrasion volume reached 71 mm3. Compared with the pure PU, the wear performance of GNS/PU composites was significantly improved.

Low-temperature synthesis of nanoscale ferromagnetic α′-MnB

2020 ◽  
Vol 49 (1) ◽  
pp. 131-135
Author(s):  
S. Klemenz ◽  
M. Fries ◽  
M. Dürrschnabel ◽  
K. Skokov ◽  
H.-J. Kleebe ◽  
...  
Keyword(s):  
Low Temperature ◽  
Nano Particles ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Bottom Up ◽  
Ferromagnetic Properties

Bottom-up synthesis of α′-MnB reveals semi-hard ferromagnetic properties of the nano-particles.

The low temperature thermal decomposition of ammonium perchlorate: nitryl perchlorate as the reaction intermediate

1984 ◽  
Vol 396 (1811) ◽  
pp. 425-440 ◽  
Keyword(s):  
Thermal Decomposition ◽  
Low Temperature ◽  
Ammonium Perchlorate ◽  
Bond Formation ◽  
Covalent Bond ◽  
Subsequent Reaction ◽  
Temperature Decomposition ◽  
Covalent Bond Formation ◽  
Localized Reaction

We identify nitryl perchlorate as the essential intermediate in the low temperature thermal decomposition of ammonium perchlorate AP. Evidence supporting this identification includes the analytical detection of an oxidized nitrogenous species in partly reacted AP and the ability of ammonium nitrate and several other nitrates to markedly reduce the induction period to decomposition of AP and to accelerate the subsequent reaction. It is also shown that the measured rate of the reaction of pure AP is in very satisfactory agreement with that estimated to result from this amount of NO 2 ClO 4 present. This mechanism differs from those currently accepted, in which the controlling process is believed to involve the transfer of either a proton or an electron. Our proposal is based on the known instability of NO 2 ClO 4 at reaction temperature ( ca . 500 K), the enhanced reactivity compared to the ionic alkali perchlorates being ascribed to covalent bond formation O 2 NO─ClO 3 . Subsequent reactions of the products of breakdown of this species, NO + , ClO 3 - and 2O or O 2 , are regarded as capable of oxidizing reactant NH 4 + (→NO 2 + ), thus regenerating the intermediate. Localized reaction in migrating ‘particles’ of fluid NO 2 ClO 4 , advancing through the reactant and leaving a residue of porous NH 4 ClO 4 , explains the unusual, incomplete low temperature decomposition that is characteristic of AP. The article reports comparative kinetic data for the decomposition of pure AP and the reaction initiated by various added nitrates. Rate studies are complemented by scanning electron microscope examinations of the geometry of interface development and the structure of the decomposed salt. From these and analytical results the role of nitryl perchlorate in AP decomposition is discussed.

Synthesis of FeC2O4-Graphene Composites and their Application in Removal Dyes

2012 ◽  
Vol 463-464 ◽  
pp. 533-537 ◽  
Author(s):  
Shui Sheng Wu ◽  
Ya Ming Wang ◽  
Qing Ming Jia ◽  
Li Li Gu ◽  
Yan Lin Sun
Keyword(s):  
Energy Storage ◽  
Graphene Nanosheets ◽  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Energy Storage Materials ◽  
Graphene Sheets ◽  
Storage Materials ◽  
Simple Chemical

A well-organized composite of graphene nanosheets decorated with FeC2O4 particles was synthesized through a simple chemical precipitation method. The FeC2O4 nanoparticles obtained were 100-150 nm in size and homogeneously anchored on graphene sheets as spacers to keep the neighboring sheets separated. The FeC2O4-graphene exhbited excellent performances in absorption propties and supercapacitor make potential uses as environment and energy storage materials in future.

Bottom-Up Assembly of Hydrophobic Nanocrystals and Graphene Nanosheets into Mesoporous Nanocomposites

Langmuir ◽  
2014 ◽  
Vol 30 (15) ◽  
pp. 4434-4440 ◽  
Author(s):  
Jijiang Huang ◽  
Wenxian Liu ◽  
Li Wang ◽  
Xiaoming Sun ◽  
Fengwei Huo ◽  
...  
Keyword(s):  
Graphene Nanosheets ◽  
Bottom Up
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