Figure 5 Pore size distribution for carbon nanopipe
determined by Barrett-Joyner-Halenda analysis of the N2
adsorption isotherm (calculated as described in ref. 15). Inset:
N2 adsorption-desorption isotherms
Figure 6 EXAFS data for Pt/carbon nanopipe. a,
k3-weighted EXAFS oscillation [k3c
(k)] for 2 wt% Pt/carbon nanopipe in wave vector
(k) space. b, Fourier transform of the k3c
(k) to distance (r)-space. Solid lines:
experimental. Dashed lines: best curve fits obtained with Pt-Pt
coordination number of 5.4, bond distance of 0.255 nm and
Debye-Waller factor of 106 pm2, with the assumption of
face-centered-cubic packing and spherical cluster geometry.
Figure 7 Scanning electron microscopic image of carbon
nanopipe sample in the form of freestanding thin film. The image was
taken by a Philips 535M apparatus operating at 20 kV.