Physicochemical characteristics of pristine and functionalized graphene

Area of Science:

• * Nanomaterials Science
• * Materials Chemistry
• * Toxicology

Background:

• * Graphene-based nanomaterials exhibit unique electrical, thermal, and strength properties.
• * Applications include composite materials, drug delivery, and tissue regeneration scaffolds.
• * Growing use necessitates understanding potential graphene toxicity.

Purpose of the Study:

• * To evaluate the toxicity of pristine graphene and oxidized graphene.
• * To characterize the surface chemistry and structure of these graphene variants.
• * To understand how these properties influence interactions in aqueous environments for in vitro and in vivo toxicity assessments.

Main Methods:

• * Synthesis of oxidized graphene from pristine graphene.
• * Characterization using X-ray photoelectron spectroscopy, Raman spectroscopy, infrared spectroscopy, thermogravimetric analysis, zeta-potential, atomic force microscopy, and electron microscopy.
• * Comparison of imaging results from atomic force microscopy and transmission electron microscopy.

Main Results:

• * Pristine and oxidized graphene samples displayed distinct surface chemistry and structures.
• * Differences in surface properties directly affect interactions with aqueous environments.
• * Discrepancies were observed in sample size measurements between atomic force microscopy and transmission electron microscopy.

Conclusions:

• * The surface chemistry and structure of graphene significantly influence its behavior in biological systems.
• * Understanding these variations is crucial for accurate in vitro and in vivo toxicity assessments.
• * Further research is needed to fully elucidate graphene's toxicological profile.