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Carbon trees grown under the current density of and concentration of 2%. (a) Typical dc plasma with a drum-like shape generated between two electrodes, the distance between which is about 3 cm. [(b)–(d)] Growth evolution of carbon trees with time in the edge region. (e) SEM image and (f) Raman spectrum of the carbon tree in Fig. 1(d), indicating the graphitelike carbon.
Diamond trees grown under the current density of and concentration of 0.26%. (a) In situ observation of the growing diamond trees. (b) Optical image of one grown diamond tree.
Morphology and characteristics of the diamond trees grown. (a) SEM image of the middle part of one branch of the diamond tree, displaying the stacking of large diamond spheres. (d) Raman spectra of surfaces of the root and middle parts of the diamond tree, demonstrating the first-order diamond peaks. (b) SEM image and (e) Raman spectrum of the cross section at the bottom of one diamond tree branch. (c) SEM image and (f) Raman spectra of the cross section near the top of the diamond tree branch.
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