High-yield Synthesis of Multiwalled Carbon Nanotube by Mechanothermal Method

Table 1 Characteristics of different samples used for investigation during milling

Milling time (h)	Sample (Id)	SA (m²/g)	Crystalline size = D(nm)
0	C₀	5.5	31.1
5	C₅	21.2	30.1
10	C₁₀	25.8	29.8
20	C₂₀	31.5	29.1
30	C₃₀	35.1	27.4
40	C₄₀	39.9	26.2
50	C₅₀	45.6	25.4
60	C₆₀	50.1	24.6
70	C₇₀	56.1	23.9
80	C₈₀	62.5	22.1
90	C₉₀	70.2	20.1
100	C₁₀₀	78.9	18.5
110	C₁₁₀	91.1	17.1
120	C₁₂₀	115.2	13.9
130	C₁₃₀	145.2	11.2
140	C₁₄₀	175.5	8.5
150	C₁₅₀	200.5	5.2
160	C₁₆₀	205.5	4.9
170	C₁₇₀	207.4	4.8
180	C₁₈₀	209.1	4.7
190	C₁₉₀	209.5	4.8
200	C₂₀₀	211.2	4.8
210	C₂₁₀	211.2	4.8
220	C₂₂₀	211.2	4.8

D is the average crystalline size, determined by the Williamson-Hall method; SA is the specific surface area, determined by the BET-method