Scheme 1. Formation of thin graphene layers from graphite mechanically deposited on GC.Figure optionsDownload full-size imageDownload as PowerPoint slide
3.2. Exfoliation of graphite in the presence of other TAA+ salts
Are the above exfoliation procedures applicable to all ammonium salts, in particular those with bulkiest cations like THA+ or TOA+? While TEA+ enables efficient exfoliation (see Fig. 4) quite similar to TMA+, the possibility of alternatively using other cations is dramatically reduced if they are significantly bulkier! It can be due to their much slower Cytarabine through natural graphite so that their action is quite probably limited to its edges (Scheme 2).
Fig. 4. Exfoliation of a GC-graphite electrode (7 mm2) in DMF/TEATf. v = 50 mV s−1. (A) One-step exfoliation. (B) Stability of the obtained electrode upon first 8 scans. Scan boundary: −2.2 V.Figure optionsDownload full-size imageDownload as PowerPoint slide
Scheme 2. Static charging (large cations) vs. dynamic migration of small cations between the planes of graphene stacks.Figure optionsDownload full-size imageDownload as PowerPoint slide