Multiple-Sized Amphiphilic Janus Gold Nanoparticles by Ligand Exchange at Toluene/Water Interface
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2016年第8期
论文作者：Kun Luo Yongdong Xiang Haiming Wang Li Xiang Zhihong Luo
文章页码：733 - 737
摘 要：Amphiphilic Janus gold nanoparticles（GNPs） are prospected to encapsulate drug molecules in cancer therapy and to serve as heterogeneous catalysts at oil/water interfaces, where Janus GNPs with different sizes are required. In this work, multiple-sized precursor GNPs were synthesized by seeded growth method protected with tris（hydroxymethyl）phosphine oxide（THPO） ligand molecule, and a ligand exchange reaction with triphenylphosphine（PPh3） at the toluene/water interface was employed to prepare amphiphilic Janus GNPs. UV-vis and transmission electron microscopy（TEM） analyses indicate that the as-prepared GNPs are nanocrystals with average diameters of 2.3 nm, 9.5 nm, 16.1 nm and 18.8 nm, respectively. Contact angle, Raman and X-ray photonic spectroscopy（XPS） analyses reveal that the selfassembled GNP films exhibit hydrophilic on one side and hydrophobic on another, owing to the adsorption of hydrophilic ligands（THPO and THP） and a similar amount of hydrophobic ligands（PPh3 and PPh3O）.Angle-resolved XPS analysis further demonstrates that the individual GNPs actually possess hydrophilic and hydrophobic compartments on the surface, which regularly packed by supramolecular interactions at toluene/water interface to form the self-assembled GNP films.
Kun Luo，Yongdong Xiang，Haiming Wang，Li Xiang，Zhihong Luo
Guangxi Key Laboratory of Universities for Clean Metallurgy Comprehensive Utilization of Nonferrous Metal Resource, College of Materials Science and Engineering, Guilin University of Technology
摘 要：Amphiphilic Janus gold nanoparticles（GNPs） are prospected to encapsulate drug molecules in cancer therapy and to serve as heterogeneous catalysts at oil/water interfaces, where Janus GNPs with different sizes are required. In this work, multiple-sized precursor GNPs were synthesized by seeded growth method protected with tris（hydroxymethyl）phosphine oxide（THPO） ligand molecule, and a ligand exchange reaction with triphenylphosphine（PPh3） at the toluene/water interface was employed to prepare amphiphilic Janus GNPs. UV-vis and transmission electron microscopy（TEM） analyses indicate that the as-prepared GNPs are nanocrystals with average diameters of 2.3 nm, 9.5 nm, 16.1 nm and 18.8 nm, respectively. Contact angle, Raman and X-ray photonic spectroscopy（XPS） analyses reveal that the selfassembled GNP films exhibit hydrophilic on one side and hydrophobic on another, owing to the adsorption of hydrophilic ligands（THPO and THP） and a similar amount of hydrophobic ligands（PPh3 and PPh3O）.Angle-resolved XPS analysis further demonstrates that the individual GNPs actually possess hydrophilic and hydrophobic compartments on the surface, which regularly packed by supramolecular interactions at toluene/water interface to form the self-assembled GNP films.
关键词：
