Redox Route from Inorganic Precursor Li sub(2)C sub(2) to Nanopatterned Carbon

• Published in: ACS nano 2017-02, Vol.11 (2), p.1455-1465
• Main Authors: Simon, Paul, Feng, Xian-Juan, Bobnar, Matej, Hohn, Peter, Schwarz, Ulrich, Carrillo-Cabrera, Wilder, Baitinger, Michael, Grin, Yuri
• Format: Article
• Language: English
• Subjects: Carbon; Computer networks; Nanostructure; Porosity; Precursors; Routing (telecommunications); Surface layer; Texture
• ISSN: 1936-0851; 1936-086X
• DOI: 10.1021/acsnano.6b06721

We present the synthesis route to carbon with hierarchical morphology on the nanoscale. The structures are generated using crystalline orthorhombic lithium carbide (Li sub(2)C sub(2)) as precursor with nanolamellar organization. Careful treatment by SnI sub(4) oxidizes carbon at the fairly low temperature of 80 degree C to the elemental state and keeps intact the initial crystallite shape, the internal lamellar texture of particles, and the lamellae stacking. The reaction product is amorphous but displays in the microstructure parallel band-like arrangements with diameters in the range of 200-500 nm. These bands exhibit internal fine structure made up by thin strips of about 60 nm width running inclined with respect to the long axis of the band. The stripes of neighboring columns sometimes meet and give rise to arrow-like arrangements in the microstructure. This is an alternative preparation method of nanostructured carbon from an inorganic precursor by a chemical redox route without applying physical methods such as ion implantation, printing, or ablation. The polymerization reaction of the triple bond of acetylide anions gives rise to a network of carbon sp super(2) species with statistically sized and distributed pores with diameters between 2 and 6 Aa resembling zeolite structures. The pores show partially paracrystal-like ordering and may indicate the possible formation of carbon species derived from graphitic foams. Keywords: amorphous carbon; lithium carbide; nanopatterning; pores; redox reaction; TEM;