scholarly journals Room-temperature Magnetic Ordering in Functionalized Graphene

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Jeongmin Hong ◽  
Elena Bekyarova ◽  
Ping Liang ◽  
Walt A. de Heer ◽  
Robert C. Haddon ◽  
...  
Keyword(s):  
Room Temperature ◽  
Magnetic Ordering ◽  
Functionalized Graphene

Tuning the magnetic properties of graphene derivatives by functional group selection

2019 ◽  
Vol 21 (23) ◽  
pp. 12697-12703 ◽  
Author(s):  
Rostislav Langer ◽  
Piotr Błoński ◽  
Michal Otyepka
Keyword(s):  
Magnetic Properties ◽  
Functional Groups ◽  
Group Selection ◽  
Room Temperature ◽  
Functional Group ◽  
Magnetic Ordering ◽  
Functionalized Graphene ◽  
Antiferromagnetic Ordering ◽  
Graphene Derivatives

The recent discovery of hydroxofluorographene G(OH)F, a graphene derivative showing room temperature antiferromagnetic ordering, suggests that there may be other sp-materials based on sp3-functionalized graphene that exhibit magnetic ordering and whose properties can be controlled by selecting suitable functional groups.

Molecule-Based Magnets—An Overview

MRS Bulletin ◽  
2000 ◽  
Vol 25 (11) ◽  
pp. 21-30 ◽  
Author(s):  
Joel S. Miller ◽  
Arthur J. Epstein
Keyword(s):  
Low Temperature ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Magnetic Ordering ◽  
Low Density ◽  
Materials Properties ◽  
The Common ◽  
New Processing ◽  
Very High

Molecule-based magnets are a broad, emerging class of magnetic materials that expand the materials properties typically associated with magnets to include low density, transparency, electrical insulation, and low-temperature fabrication, as well as combine magnetic ordering with other properties such as photoresponsiveness. Essentially all of the common magnetic phenomena associated with conventional transition-metal and rare-earth-based magnets can be found in molecule-based magnets. Although discovered less than two decades ago, magnets with ordering temperatures exceeding room temperature, very high (∼27.0 kOe or 2.16 MA/m) and very low (several Oe or less) coercivities, and substantial remanent and saturation magnetizations have been achieved. In addition, exotic phenomena including photoresponsiveness have been reported. The advent of molecule-based magnets offers new processing opportunities. For example, thin-film magnets can be prepared by means of low-temperature chemical vapor deposition and electrodeposition methods.

Magnetic Ordering in Relation to the Room-Temperature Magnetoelectric Effect ofSr3Co2Fe24O41

2011 ◽  
Vol 106 (8) ◽  
Author(s):  
Minoru Soda ◽  
Taishi Ishikura ◽  
Hiroyuki Nakamura ◽  
Yusuke Wakabayashi ◽  
Tsuyoshi Kimura
Keyword(s):  
Room Temperature ◽  
Magnetoelectric Effect ◽  
Magnetic Ordering

L-cysteine functionalized graphene quantum dots for sub-ppb detection of As (III)

2021 ◽  
Author(s):  
Md. Farhan Naseh ◽  
Neelam Singh ◽  
Jamilur R. Ansari ◽  
Ashavani Kumar ◽  
Tapan Sarkar ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Quantum Dots ◽  
Room Temperature ◽  
Graphene Quantum Dots ◽  
Optical Characterization ◽  
Functionalized Graphene ◽  
Transmission Electron ◽  
Sensitivity And Selectivity ◽  
Structural Characterizations

Abstract Here, we report functionalized graphene quantum dots (GQDs) for the optical detection of arsenic at room temperature. GQDs with the fluorescence of three fundamental colors (red, green, and blue) were synthesized and functionally capped with L-cysteine (L-cys) to impart selectively towards As (III) by exploiting the affinity of L-cys towards arsenite. The optical characterization of GQDs was carried out using UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy, and fluorescence spectrometry and the structural characterizations were performed using transmission electron microscopy. The fluorescence results showed instantaneous quenching in intensity when the GQDs came in contact with As (III) for all test concentrations over a range from 0.025 ppb to 25 ppb, which covers the permissible limit of arsenic in drinking water. The experimental results suggested excellent sensitivity and selectivity towards As (III).

Multi-functional biomimetic graphene induced transformation of Fe3O4 to ε-Fe2O3 at room temperature

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89488-89497 ◽  
Author(s):  
Soumya Bhattacharya ◽  
Anirban Roychowdhury ◽  
Dipankar Das ◽  
Suprabha Nayar
Keyword(s):  
Room Temperature ◽  
Functionalized Graphene ◽  
Protein Polymer ◽  
Graphene Nanoflakes ◽  
Visual Evidence

A schematic showing the formation of nanosized ε-Fe2O3 in protein–polymer functionalized graphene; the templated IONPs literally coat the graphene nanoflakes. G–IONP colloidal fluid, TEM and MFM micrographs provide visual evidence of the same.

Concentration Dependence of Room Temperature Magnetic Ordering in Dilute Fe: Ge1 − x Te x Alloy

2005 ◽  
Vol 160 (1-4) ◽  
pp. 241-246 ◽  
Author(s):  
D. R. S. Somayajulu ◽  
Narendra Patel ◽  
Mukesh Chawda ◽  
Mitesh Sarkar ◽  
K. C. Sebastian
Keyword(s):  
Concentration Dependence ◽  
Room Temperature ◽  
Magnetic Ordering

scholarly journals Spontaneous Magnetization and Optical Activity in the Chiral Series {(L-proline)nV[Cr(CN)6]x} (0 < n < 3)

2020 ◽  
Vol 6 (1) ◽  
pp. 12
Author(s):  
Bárbara Rodríguez-García ◽  
Jose Ramon Galan-Mascaros
Keyword(s):  
Spectroscopic Data ◽  
Room Temperature ◽  
Spontaneous Magnetization ◽  
Magnetic Hysteresis ◽  
Magnetic Ordering ◽  
Structural Features ◽  
Natural Amino Acid ◽  
Amorphous Nature ◽  
Redox Stability ◽  
Circular Dichroic

The incorporation of the natural amino acid L-proline in the synthesis to vanadium-chromium Prussian blue derivatives results in materials exhibiting magnetic ordering including chiral magnetic centers. Although the amorphous nature of these materials makes difficult to assess the structural features of these proline-containing compounds, magnetic and spectroscopic data confirms their multifunctionality. They exhibit high-temperature magnetic ordering (Tc < 255 K) and a circular dichroic signal, representing the molecule-based chiral magnets with the highest ordering temperatures reported to date. In addition, the presence of chiral L-proline (or D-proline) has additional benefits, including higher redox stability and the appearance of magnetic hysteresis. The latter was not observed in the parent compounds, the series of room temperature molecule-based magnets V[Cr(CN)6]x.

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