中文摘要：

使用生物分子DL-甲硫氨酸辅助水热方法合成Cu7S4纳米管,产物的形貌与晶型可通过改变实验参数进行调控.研究表明,硝酸铜和DL-甲硫氨酸在反应开始时的配位比为1∶2,而且当反应物的摩尔比为1∶2和反应温度为200℃时可合成直径为100-600nm、长度达40-100μm的多晶Cu7S4纳米管.使用D-或L-甲硫氨酸均能得到类似Cu7S4纳米管.Cu7S4纳米管的禁带宽度为2.88eV,与Cu7S4的块体材料相比有明显蓝移.基于实验研究结果,讨论了甲硫氨酸分子中的官能团与反应产物之间的联系并提出了Cu7S4纳米管的自牺牲模板法形成机理.

英文摘要：

Cu7S4 nanotubes were synthesized using a biomolecule DL-methionine-assisted hydrothermal method.The morphology and phase of the products can be controlled by adjusting the reaction parameters such as synthesis temperature,reaction time and the molar ratio of the reagents.We found that uniform polycrystal Cu7S4 nanotubes with diameters of 100-600 nm and lengths of 40-100 μm can be controllably synthesized at 200℃ when the molar ratio of Cu（NO3）2 to DL-methionine in the synthesis system is 1：2.Similar Cu7S4 nanotubes can be obtained from D-or L-methionine systems.The bandgap energy of the Cu7S4 nanotubes was measured to be about 2.88 eV,a remarkable blue shift in comparison with that of bulk Cu7S4（2.0 eV）.We discussed the relationship between the products and the functional groups in the amphiphilic biomolecules.On the basis of our experimental data,we proposed that the Cu7S4 nanotubes were formed versus a self-sacrificing template mechanism.