期刊
ADVANCED FUNCTIONAL MATERIALS
卷 20, 期 2, 页码 296-303出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200901336
关键词
-
类别
资金
- MOE ARF [144-000-023-101]
- A*STAR SERC [052-117-0030]
Here, monolayer-protected gold and silver nanoparticles with extremely high solvent dispersibility (over 200 mg mL(-1) in water and glycols) and low coalescence temperature (approximately 150 degrees C, measured by the percolation transition temperature T-p) are developed, to reach conductivities better than 1 X 10(5) S cm(-1). These materials are suitable for inkjet and other forms of printing on substrates that may be solvent- and/or temperature-sensitive, such as for plastic electronics, and as bus lines for solar and lighting panels. This is achieved using a new concept of the sparse ionic protection monolayer. The metal nanoparticles; are initially protected by a two-component mixed ligand shell comprising an omega-functionalized ionic ligand and a labile ligand. These are selectively desorbed to give a sparse shell of the to-ionic ligands of ca. 25% coverage. Through a systematic study of different monolayer-protected Au nanoparticles using FTIR spectroscopy, supported by XPS and DSC, it is shown that T-p is not determined by thermodynamic size melting or by surface area effects, as previously thought, but by the temperature when ca. 80% of the dense monolayer is eliminated. Therefore, T-p depends on the thermal stability and packing density of the shell, rather than the size of the metal core, while the solubility characteristics depend strongly on the exposed terminal group.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据