[(a)–(c)] Different magnification SEM image of TGCs observed at a tilt angle of 35°. The sharpest TGC has an apex angle as small as 2.3° (c); (d) the distribution of straight TGC’s apex angle.
(a) Low-resolution TEM image of single TGC, (b) high-resolution TEM image of the TGC tip; the inset of (a) is an EDS spectrum of the TGC.
[(a) and (c)] Cross-sectional SEM image of the TGC sample; (c) EDS spectra taken from the root and middle of individual TGCs shown in (a); (d) enlarged image of the marked area in (b), showing a CNT in the TGC.
(a) Typical Raman spectra of different areas of a single TGC; (b) the / and FWHM of band as a function of distance from the tip to the root, showing the highly crystalline tip and poor-quality root.
Emission current density vs the applied electric field of TGCs and corresponding FN plot (inset).
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