Large magnetic moment at sheared ends of single-walled carbon nanotubes<xref rid="cpb_27_12_128101fn1" ref-type="fn">*</xref><fn id="cpb_27_12_128101fn1"><label>*</label><p>Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0208403 and 2016YFA0200403), the National Natural Science Foundation of China (Grant Nos. 51472057, 11874129, 91323304, and 11674387), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA09040101), and the Baotou Rare Earth Research and Development Centre, Chinese Academy of Sciences (Grant No. GZR 2018001).</p></fn>

Large magnetic moment at sheared ends of single-walled carbon nanotubes**

Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0208403 and 2016YFA0200403), the National Natural Science Foundation of China (Grant Nos. 51472057, 11874129, 91323304, and 11674387), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA09040101), and the Baotou Rare Earth Research and Development Centre, Chinese Academy of Sciences (Grant No. GZR 2018001).

Zhang Jian^{1, 4}, Deng Ya^{1, 4}, Hao Ting-Ting², Hu Xiao^{1, 4}, Liu Ya-Yun^{1, 4}, Peng Zhi-Sheng³, Nshimiyimana Jean Pierre^{1, 4}, Chi Xian-Nian^{1, 4}, Wu Pei^{1, 4}, Liu Si-Yu³, Zhang Zhong¹, Li Jun-Jie², Wang Gong-Tang^{3, ‡}, Chu Wei-Guo^{1, §}, Gu Chang-Zhi², Sun Lian-Feng^{1, ¶}

(color online) Thermo–gravimetric (TG) analysis and differential thermo–gravimetric (DTG) analysis of pristine and sheared SWNTs samples. Percentage of SWNTs with sheared ends in SWNT sample can be estimated by the comparison between DTG curves. The experiments are carried out in dry air with a ramp rate 5 °C/min. (a) Typical curve of TG and DTG of purified, pristine SWNTs sample. Small peak at 411.1 °C and main peak at 638.8 °C are attributed to oxidation temperature of amorphous carbon and SWNTs, respectively. Residual mass is 2.50%, which varies a little from sample to sample. (b) Typical TG and DTG curve of sheared SWNTs sample. Comparing with pristine SWNTs, oxidation temperature of SWNTs shifts a little bit to 633.8 °C. There is plateau in DTG curve with starting temperature 312.3 °C. This plateau of DTG curve comes from SWNTs with sheared ends in SWNT sample as shown by inset in SEM image marked with red rectangle. The percentage of SWNTs with sheared ends can be estimated by integrating the corresponding area in DTG curve after subtracting the percentage of amorphous carbon. Residual mass of sheared SWNTs becomes larger due to introduction of trace amount of titanium.