【摘要】 通过调控过氧化氢与金纳米棒相互作用时溶液的H~+和Br~-浓度,考察了过氧化氢刻蚀金纳米棒的条件.通过静电相互作用将聚苯乙烯磺酸钠修饰到带正电的金纳米棒表面,并探讨了表面配体变化对过氧化氢与金纳米棒相互作用的影响,比较了聚苯乙烯磺酸钠浓度改变对过氧化氢刻蚀金纳米棒所引起的等离子体吸收峰的变化.结果表明,过氧化氢与金纳米棒作用过程中,H~+浓度增加可以加快刻蚀反应速率,Br~-起到稳定金离子的作用.采用聚苯乙烯磺酸钠修饰抑制了过氧化氢对金纳米棒的刻蚀,当聚苯乙烯磺酸钠与金纳米棒表面的CTAB完全作用后,复合材料电位接近零,金纳米棒的稳定性降低,继续增加聚苯乙烯磺酸钠的量至电位为负,复合材料稳定性增加.更多还原

【Abstract】 The interaction conditions for H₂O₂ with Au nanorods（ Au NRs） were investigated by changing the concentrations of H+and Br-in the reaction solution. Au NRs with positively surface were modified by poly（ sodium-styrenesulfonate）（ PSS） via electrostatic interaction to detect the effect of different ligands on the interaction between H₂O₂ and Au NRs. Different PSS concentration led to the corresponding change in localized surface plasmon resonance（ LSPR） absorption peak of Au NRs. The results demonstrated that the increase of H⁺ concentration led to the increase of etching reaction ratio of Au NRs. The role of Br^-was depicted as stabilizing gold ions during the etching process of Au NRs. PSS molecules on Au NRs inhibited the etching process. In addition,the stability of PSS-modified Au NRs had great relation with the concentration of PSS molecules. When the amounts of PSS and hexadceyl trimethyl ammonium bromide（ CTAB） were the same,the zeta potential was zero. Thus,Au NRs were unstable. With increasing the amount of PSS,the surface zeta potential became negatively and the stability of Au NRs increased.更多还原