Single-layer graphene

Fig. 32. Reversible capacity of microporous carbon prepared from phenolic resins heated between 940 to 1 I00°C plotted as a function of the X-ray ratio R. R is a parameter which is empirically correlated to the fraction of single-layer graphene sheets in the samples.

Fig. 2. By rolling up a graphene sheet (a single layer of ear-bon atoms from a 3D graphite erystal) as a cylinder and capping each end of the eyiinder with half of a fullerene molecule, a fullerene-derived tubule, one layer in thickness, is formed. Shown here is a schematic theoretical model for a single-wall carbon tubule with the tubule axis OB (see Fig. 1) normal to (a) the 6 = 30° direction (an armchair tubule), (b) the 6 = 0° direction (a zigzag tubule), and (c) a general direction B with 0 < 6 < 30° (a chiral tubule). The actual tubules shown in the figure correspond to (n,m) values of (a) (5,5), (b) (9,0), and (c) (10,5).

Flat single-layer graphene is a zero band-gap semiconductor [50], in which every direction for electron transport is possible. However, when the graphene sheet is rolled up to form a SWCNT, the number of allowed states is limited by quantum confinement in the radial direction [17], i.e. the movement of electrons is confined by the periodic boundary condition [51] ... 

A.A. Balandin, S. Ghosh, W. Bao, I. Calizo, D. Teweldebrhan, F. Miao, et al., Superior thermal conductivity of single-layer graphene, Nano Letters, 8 (2008) 902-907. 

P.Y. Huang, C.S. Ruiz-Vargas, A.M. van der Zande, W.S. Whitney, M.P. Levendorf, ).W. Kevek, et al., Grains and grain boundaries in single-layer graphene atomic patchwork quilts, Nature. 469 (2011) 389-392. 

Fig. 4.11 Time frames obtained by simulation of stress-strain tests on (a) N-doped SWCNTs, (b) B-doped SWCNTs and (c) N-doped single layer graphene.

Gutes, A., C. Carraro, and R. Maboudian, Single-layer CVD-grown graphene decorated with metal nanoparticles as a promising biosensing platform. Biosensors and Bioelectronics,... 

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