Preparation and Physical Properties of Red-photoluminescent Graphene/Europium(III)/Picolinate

Abstract

Novel photoluminescent graphene, graphene/europium/picolinate, was made from the reaction of the graphene carboxylate, europium(III) and α-pyridoin anion in methanol solution. There was evidence on IR spectroscopic data that europium metal was coordinated by graphene carboxylate. The graphene/europium/picolinate materials emitted the red luminescence with main peaks at 609 and 695 nm, when solid sample was excited by an UV light at the wavelength of 254 nm. The surface morphology and physical properties of the graphene/europium/picolinate product have been investigated by IR, PL, SEM, TEM and TGA measurements.

Easy preparation of an MRI contrast agent with high longitudinal relaxivity based on gadolinium ions-loaded graphene oxide

“…In addition, although several types of metal ions (e.g. Ca 2+ , Mg 2+ , and Eu 3+ ) have been shown to be chelated by oxygen-containing functional groups on the GO sheets, 16,29 it is a well-known fact that chelating Gd 3+ is difficult due to its large radius. Thus, the question of whether Gd 3+ can be chelated by the carboxyl groups in CGO still remains.…”

Preparation and Properties of Luminescent Lanthanide Based Graphene Oxide

“…Graphene oxide was prepared by Teresa Bandosz, (City College New York) and used as obtained. Graphene oxide/europium materials were first prepared following the procedure outlined by Kim et al [44]. The graphene oxide (0.5 g), water (20 mL) and NaOH (1 M aqueous solution, 1 mL) were sonicated for 30 minutes in a Cole-Parmer sonicator at 200 W. Europium nitrate, Eu(NO 3 ) 3…”