Warren Scott C, Banholzer Matthew J, Slaughter Liane S, Giannelis Emmanuel P, DiSalvo Francis J, Wiesner Ulrich B
Department of Chemistry & Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
J Am Chem Soc. 2006 Sep 20;128(37):12074-5. doi: 10.1021/ja064469r.
We report the generalized synthesis of metal nanoparticles with liquid-like behavior. We introduce a thiol-containing ionic liquid, N,N-dioctyl-N-(3-mercaptopropyl)-N-methylammonium bromide, which serves as a ligand for platinum, gold, palladium, and rhodium nanoparticles. A rapid reduction using THF-soluble metal salts in the presence of the thiol generates nanoparticles with tunable sizes and size distributions. The as-synthesized nanoparticles are a solid and decompose before melting. Upon exchange of the halide anion for an amphiphilic sulfonate anion, however, the nanoparticles exhibit liquid-like properties at room temperature. The liquids have high metal loadings; for example, the 2.7 nm platinum nanoparticle liquid is 36% platinum by mass.
我们报道了具有类液体行为的金属纳米颗粒的通用合成方法。我们引入了一种含硫醇的离子液体，N,N-二辛基-N-(3-巯基丙基)-N-甲基溴化铵，它作为铂、金、钯和铑纳米颗粒的配体。在硫醇存在下，使用可溶于四氢呋喃的金属盐进行快速还原，可生成尺寸和尺寸分布可调的纳米颗粒。合成的纳米颗粒是固体，在熔化前会分解。然而，当卤化物阴离子被两亲性磺酸根阴离子交换后，纳米颗粒在室温下表现出类液体性质。这些液体具有高金属负载量；例如，2.7纳米的铂纳米颗粒液体的质量含铂量为36%。
