Purification and Functionalization of Single-Walled Carbon Nanotubes through Different Treatment Procedures

Table 1

The TGA analysis of SWCNTs using a combination of ultrasonic and microwave for various treatment times (5, 10, 20, and 30 min) with various HNO₃ concentrations (0.5, 1, and 3 M).

Microwave treatment time (min)	HNO3 concentration (M)
	3 M		1 M		0.5 M
	𝑇^ad5 (°C)	Char yield (%)	𝑇d5 (°C)	Char yield (%)	𝑇d5 (°C)	Char yield (%)
0	678.7	90.2	678.7	90.2	678.7	90.2
5	619.6	86.6	655.9	89.0	692.2	91.1
10	553.7	82.5	571.2	86.4	717.7	92.9
20	522.8	81.3	534.8	84.2	815.9	95.7
30	490.5	80.4	522.8	80.7	752.7	93.8

aDecomposition temperature at 5% weight loss.