1‐Aza‐15‐Crown‐5 Functionalized Graphene Oxide for 2D Graphene‐Based Li⁺‐ion Conductor

Abstract

Attachment of Li(+) ion on graphene surface to realize Li(+)-ion conductor is a real challenge because of the weak interaction between the ions and the functional groups of graphene oxide; although, a large number of theoretical results are already available in the literature. To overcome this problem, graphene oxide is functionalized by 1-aza-15-crown-5, the cage-like structure containing four oxygens that can bind Li(+) ion through electrostatic interaction. Li(+) migration on graphene surface has been investigated using ac relaxation mechanism. Perfect Debye-type relaxation behavior with β (relaxation exponent) value ≈1 resulting from single ion is observed. The activation energy of Li(+) migration arising due to cation-π interaction is found to be 0.37 eV, which agrees well with recently reported theoretical value. It is believed that this study will help to design isolated ion conductors for Li(+)-ion battery.

Refinements to the structure of graphite oxide: absolute quantification of functional groups via selective labelling

“…Of the four labels, only 2,4-DNPH and 1,2-PD contain amine moieties, which as strong nucleophiles are commonly used to attack epoxide groups in GO. [60][61][62][63] Our XPS data supports this conclusion due to the loss of C-O bonding modes in GO after both reactions. While the reaction between 1,2-PD and epoxyls does proceed to give secondary amines, these adducts are electrochemically inactive.…”

Highly luminescent N-doped carbon quantum dots from lemon juice with porphyrin-like structures surrounded by graphitic network for sensing applications

“…[11][12][13] Compared with traditional inorganic semiconductor QDs, CQDs with superior photostability and lower cytotoxicity have shown exceptional performance in bio-applications, especially in sensors. [14][15][16] During the last few years graphene quantum sheets and functionalized graphene based materials are used for studying different functional properties, [17][18][19] selective detection of nitro explosive 20 and adsorption of toxic metal ions (As, Hg, Cr etc.) from waste water.…”

Crown-Ether Derived Graphene Hybrid Composite for Membrane-Free Potentiometric Sensing of Alkali Metal Ions

“…17 No coverage was reported by Banerjee and co-workers. 18 A high surface coverage of approximately 34% is achieved in the present work.…”

“…In the previous reports, for example by Ballesteros-Garrido and co-workers for 9-crown[3]­ether on RGO and by Banerjee and co-workers for 15-crown[5] on GO, the crown-ether was directly attached to graphene-like two-dimensional (2D) materials. In contrast to such approaches, we introduced a short flexible glycine-linker between the crown ether and RGO to evoke conformational flexibility.…”