【作者】 张鸿斌； 林国栋； 武小满； 董昆明； 黄传敬；

【Author】 ZHANG Hong-bin,LIN Guo-dong,WU Xiao-man,DONG Kun-ming,HUANG Chuan-jing Inst.of Chemistry & Chemical Eng.and State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University, Xiamen 361005,China

【机构】 厦门大学化学化工学院,固体表面物理化学国家重点实验室；

【摘要】 用Raman光谱方法研究碳纳米管对H₂的吸附特性,得到一些有意义的结果。更多还原

【Abstract】 Raman spectra of the H₂ /K⁰ -MWCNTs adsorption system were taken in region of 500-5 000 cm^-1 with an UV-Vis Raman System.The observed strong Raman bands at 1 580 and 1 416 cm^-1 could be attributed to the fundamental frequency modes E_2g and D（induced by defects） of the MWCNTs,analogous to those of graphite,and the bands at 2 832,2 996,3 160 cm^-1 and the region of 4 410-4 422 cm^-1 may be due to their second and third-order combination frequencies:2D,D+ E_2g,2E_2g,and 2D+ E_2g,respectively. It was experimentally demonstrated that adsorption of H₂ on the K⁰-MWCNTs at room temperature could occur in associative and dissociative forms,and the observed Raman bands at 2 856,3 228 and 3 946 cm^-1 could be assigned to v_s（C—H） for CH₂,v （C—H） for CH and v（H—H） for H₂（a）,respectively,and that the modification of metallic potassium to the MWCNTs resulted not only in a significant increase in intensity of the Raman bands associated with surface hydrogen-containing adspecies,CH_x（x = 3,2, 1） and H₂（a）,but also in a red-shift of 18 cm^-1(from 3 960 cm^-1 to 3 942 cm^-1) for H—H stretching of H₂（a） adspecies,which could be understood considering that the modification of metallic potassium to the MWCNTs substrate enhanced the tendency of backdonating electron from the MWCNTs to the empty antibonding-orbitalσ^* of molecularly adsorbed H₂（a）,thereby further decreasing the bonding-order of the H—H bond.更多还原