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选用乙酰丙酮铜Cu(acac)2为前驱物,氢气为反应气,采用低温有机金属化学气相沉积法(MOCVD)在介孔基质SBA-15中合成出了铜纳米棒.该反应过程中,氢气起了重要作用,一方面氢将金属有机物的配位还原,从而使其更容易扩散进入SBA-15孔内部,同时氢也将二价铜离子还原为金属铜,从而得到铜棒.这种铜纳米结构由于具有独特的光学、磁学及电学特性,因而在半导体研究领域中有潜在的重要应用价值.另外,研究还发现基质SBA-15的表面特性对于合成该铜纳米结构有重要影响,将一层碳覆盖于基质表面后,SBA-15由亲水表面变为憎水表面,更加有利于有机铜的吸附和铜离子在其内表面的沉积.该合成方法简单,反应只需较低的反应温度(400℃)和真空度(2kPa),实现了温和条件下制备铜纳米棒状材料.
Cu (acac) 2 as precursor and hydrogen as reactant were selected to synthesize copper nanorods in mesoporous SBA-15 by low temperature organic metal chemical vapor deposition (MOCVD) method. During the reaction, hydrogen Plays an important role in that on the one hand hydrogen reduces the complexation of the organometallics so that it diffuses more easily into the pores of the SBA-15 and at the same time the hydrogen also reduces the divalent copper ions to metallic copper, resulting in a copper rod. Due to its unique optical, magnetic and electrical properties, nanostructures have potential applications in the field of semiconductor research.In addition, the study also found that the surface properties of the matrix SBA-15 have an important impact on the synthesis of the copper nanostructures. After a layer of carbon is coated on the surface of the substrate, SBA-15 changes from a hydrophilic surface to a hydrophobic surface, which is more conducive to the adsorption of organic copper and the deposition of copper ions on the inner surface of the substrate. The synthesis method is simple and the reaction only needs a lower Reaction temperature (400 ℃) and degree of vacuum (2kPa), to achieve the preparation of copper nanorods under mild conditions.