Pasricha Renu, Swami Anita, Sastry Murali
Nanoscience Group, Materials Chemistry Division, National Chemical Laboratory, Pune-411 008, India.
J Phys Chem B. 2005 Oct 27;109(42):19620-6. doi: 10.1021/jp0530552.
The transmetalation reaction between a sacrificial nanoparticle and more noble metal ions in solution has emerged as a novel method for creating unique hollow and bimetallic nanostructures. In this report, we investigate the possibility of carrying out the transmetalation reaction between hydrophobic silver nanoparticles assembled and constrained at the air-water interface and subphase gold ions. We observe that facile reduction of the subphase gold ions by the sacrificial silver nanoparticles occurs resulting in the formation of elongated gold nanostructures that appear to cross-link the sacrificial silver particles. This transmetalation reaction may be modulated by the insertion of an electrostatic barrier in the form of an ionizable lipid monolayer between the silver nanoparticles and the aqueous gold ions that impacts the gold nanoparticle assembly. Transmetalation reactions between nanoparticles constrained into a close-packed structure and appropriate metal ions could lead to a new strategy for metallic cross-linking of nanoparticles and generation of coatings with promising optoelectonic behavior.
牺牲性纳米颗粒与溶液中更贵金属离子之间的金属转移反应已成为一种制备独特中空和双金属纳米结构的新方法。在本报告中,我们研究了在空气-水界面组装并受限的疏水性银纳米颗粒与亚相金离子之间进行金属转移反应的可能性。我们观察到,牺牲性银纳米颗粒使亚相金离子易于还原,从而形成了似乎能交联牺牲性银颗粒的细长金纳米结构。这种金属转移反应可通过在银纳米颗粒与影响金纳米颗粒组装的水基金离子之间插入可电离脂质单层形式的静电屏障来调节。受限形成紧密堆积结构的纳米颗粒与合适的金属离子之间的金属转移反应可能会导致一种用于纳米颗粒金属交联和生成具有有前景的光电行为涂层的新策略。