scholarly journals Room temperature organic magnets derived from sp3 functionalized graphene

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Jiří Tuček ◽  
Kateřina Holá ◽  
Athanasios B. Bourlinos ◽  
Piotr Błoński ◽  
Aristides Bakandritsos ◽  
...  
Keyword(s):  
Room Temperature ◽  
Functionalized Graphene ◽  
Organic Magnets

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.

scholarly journals Metal-organic magnets with large coercivity and ordering temperatures up to 242°C

Science ◽  
2020 ◽  
Vol 370 (6516) ◽  
pp. 587-592 ◽  
Author(s):  
Panagiota Perlepe ◽  
Itziar Oyarzabal ◽  
Aaron Mailman ◽  
Morgane Yquel ◽  
Mikhail Platunov ◽  
...  
Keyword(s):  
Metal Ions ◽  
Room Temperature ◽  
Building Blocks ◽  
Inorganic Materials ◽  
Coordination Networks ◽  
Critical Temperatures ◽  
Considerable Success ◽  
Organic Magnets ◽  
Metal Organic ◽  
Constituent Elements

Magnets derived from inorganic materials (e.g., oxides, rare-earth–based, and intermetallic compounds) are key components of modern technological applications. Despite considerable success in a broad range of applications, these inorganic magnets suffer several drawbacks, including energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation magnets relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands. Following this approach, we report the general, simple, and efficient synthesis of lightweight, molecule-based magnets by postsynthetic reduction of preassembled coordination networks that incorporate chromium metal ions and pyrazine building blocks. The resulting metal-organic ferrimagnets feature critical temperatures up to 242°C and a 7500-oersted room-temperature coercivity.

Stable Cu2O nanocrystals grown on functionalized graphene sheets and room temperature H2S gas sensing with ultrahigh sensitivity

Nanoscale ◽  
2013 ◽  
Vol 5 (4) ◽  
pp. 1564 ◽  
Author(s):  
Lisha Zhou ◽  
Fangping Shen ◽  
Xike Tian ◽  
Donghong Wang ◽  
Ting Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Graphene Sheets ◽  
Functionalized Graphene ◽  
Ultrahigh Sensitivity

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.

scholarly journals Aryl fluoride functionalized graphene oxides for excellent room temperature ammonia sensitivity/selectivity

RSC Advances ◽  
2018 ◽  
Vol 8 (36) ◽  
pp. 20440-20449 ◽  
Author(s):  
Farheen Khurshid ◽  
M. Jeyavelan ◽  
Keisuke Takahashi ◽  
M. Sterlin Leo Hudson ◽  
S. Nagarajan
Keyword(s):  
Graphene Oxide ◽  
Room Temperature ◽  
Click Reaction ◽  
Functionalized Graphene ◽  
Graphene Oxides ◽  
Covalent Functionalization ◽  
Ammonia Sensing ◽  
Aryl Fluoride

Covalent functionalization of graphene oxide (GO) through ‘‘click’’ reaction and its applications towards ammonia sensing has been demonstrated.

Room temperature ammonia gas sensor using Meta Toluic acid functionalized graphene oxide

2020 ◽  
Vol 240 ◽  
pp. 121922 ◽  
Author(s):  
Ravi Kumar ◽  
Anil Kumar ◽  
Rakesh Singh ◽  
Rajesh kashyap ◽  
Rajiv Kumar ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Gas Sensor ◽  
Room Temperature ◽  
Functionalized Graphene ◽  
Ammonia Gas ◽  
Functionalized Graphene Oxide

scholarly journals Room Temperature Chemoresistive Gas Sensor Based on Organic-Functionalized Graphene Oxide

Proceedings ◽  
2017 ◽  
Vol 1 (8) ◽  
pp. 805
Author(s):  
Matteo Valt ◽  
Barbara Fabbri ◽  
Andrea Gaiardo ◽  
Sandro Gherardi ◽  
Cesare Malagù ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Gas Sensor ◽  
Room Temperature ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide
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