Synthesis and solid-state NMR structural characterization of 13C-labeled graphite oxide

Area of Science:

• Materials Science
• Chemistry
• Solid-State Physics

Background:

• Graphite oxide (GO) is a layered material and precursor to chemically modified graphenes.
• The precise chemical structure of GO has remained unresolved due to pseudo-random functionalization and compositional variations.
• Standard 13C solid-state nuclear magnetic resonance (SSNMR) of natural abundance GO yields poor signal-to-noise ratios.

Purpose of the Study:

• To resolve the detailed chemical structure of graphite oxide (GO).
• To overcome limitations of low signal-to-noise ratios in SSNMR analysis of GO.
• To enable fundamental studies of 13C-labeled graphite and graphene.

Main Methods:

• Preparation of approximately 100% 13C-labeled graphite.
• Conversion of 13C-labeled graphite to 13C-labeled GO.
• Analysis of 13C-labeled GO using 13C solid-state nuclear magnetic resonance (SSNMR).

Main Results:

• Detailed insights into the chemical bonding network of GO were obtained.
• Identification of specific chemical groups and their interconnections within the GO structure.
• Enhanced sensitivity in SSNMR spectra of 13C-labeled GO was achieved.

Conclusions:

• 13C-labeled graphite is a viable precursor for preparing 13C-labeled GO for detailed SSNMR analysis.
• The study successfully revealed previously unresolved details of GO's chemical structure.
• This methodology facilitates advanced studies of chemically modified graphenes and labeled carbon materials.