【作者】 吴挺；

【导师】 余海湖；

【作者基本信息】 武汉理工大学 ， 材料学， 2006， 硕士

【摘要】 碳纳米管具有优异的物理、化学、机械性能和独特的结构,碳纳米管基复合材料的研究受到广泛关注。金纳米粒子在纳米电子学、金催化等领域有着广泛应用,在生物医学领域可用于生物标记和检测。在待测物浓度较低时,存在检测信号微弱等问题。若将碳纳米管与金纳米粒子复合,可通过碳纳米管表面硫金键来吸附有机大分子,使分散的有机大分子富集起来,增强检测信号。 采用加热氧化法制备了可溶性多壁碳纳米管,经处理的碳纳米管明显细化,夹杂的非晶碳和金属杂质基本去除,红外光谱结果显示碳纳米管管壁和端头存在一定数量的羧基和羟基等官能团。碳纳米管表面官能团数量与混酸氧化的时间有很大关系,对后续实验有关键影响。所制备的碳纳米管水溶胶具有良好的分散性和稳定性。 采用柠檬酸钠还原氯金酸制备了金水溶胶,研究了影响金纳米粒子的粒径的相关因素。实验表明,金纳米颗粒的大小与反应时间和加入的还原剂的量密切相关,通过控制反应时间和还原剂的加入量,获得金纳米粒子的最小粒径为约12nm。柠檬酸钠还原氯金酸,因成核数量有限,所制备的金纳米粒子粒径在12nm以上。 将纯化后的多壁碳纳米管进行预处理,使其表面形成巯基,采用自组装的方法实现了金纳米粒子在碳纳米管表面的自组装,制备了碳纳米管/金纳米粒子复合材料。研究表明,所制样品结构稳定,碳纳米管表面的金纳米粒子呈球形且分布均匀,平均粒径约为2nm。碳纳米管表面的金纳米粒子粒径较小,是因为碳纳米管表面形成大量的晶核,溶液中氯金酸的浓度降低,限制金纳米粒子生长,导致纳米颗粒粒径较小。 碳纳米管有很大的比表面积,金纳米粒子有高比例表面原子,使碳纳米管/金纳米粒子复合材料具有大的比表面积及表面活性,预计可在催化、生物学检测等领域得到应用。更多还原

【Abstract】 Carbon nanotubes have demonstrated a wealth of exceptional structure, mechanical and electronic properties, which have made them potentially useful for application in nano-composites. The nanogold particle has extensive application in the fields of nanometer electronics, gold catalysis etc. It also can be used in the biological mark and measure, but when the solution is lower in density in the biomedical, the question such as being faint of the testing signal exists. Compound carbon nanotube with the nanogold particles.It can unite the C₆H₁₆SSi and a large number of nanogold particles through the key, and then absorb the organic macromolecule through the sulphur gold key, make the originally scattered organic macromolecule collect richly, originally faint information will be strengthened.Water soluble multiwall carbon nanotube （MWNT） was prepared via chemical oxidation. Studies have shown, the carbon nanotubes is obviously thinning, have higher purity , It is in charge of some carboxyl and hydroxyl exist in the carbon nanotube, the quantity of functional group on the surface of carbon nanotube relate of oxidize time, the control of oxidizes time is the key to testing successfully in follow-up. Water soluble multiwall carbon nanotube has good dispersiveness and stability.Adopt the One-step prepare nanogold sol, having selected Na3-citrate aqueous solution reduced HAuCl₄·3H₂O and prepared nanogold sol. We have studied a relevant factor of influencing the gold nanometer particle. The experiment shows , the size of the nanogold particles is closely related with the quantity of reducing agent, through controlling the joining amount and the time, the minimum diameter we obtain the gold nanometer particle are 12nm, Because nanometer particles are limited, nanogold particle’s diameter are larger.The pretreatment of carbon nanotubes make its surface form the sulfhydryl-base, It realized the gold nanometer particle on carbon nanotube surface equipment by self-assembling, have prepared carbon nanotubes/nanogold composite. Studies have shown, the structure of samples is steady, the nanogold particles on the carbon nanotubes takes the form of ball and distributed evenly , the average diameters are about 2nm. Because there are more surface area on the carbon nanotubes than the others, thus form more nanometer particle on the carbon nanotube surface, it make the original density of nanogold solution lower, restraining the gold nanometer particle from growing, making nanometer particle are smaller.更多还原