Deposition of gallium oxide nanodots prepared from metal-assembling dendrimer molecules isolated by the spacing of the nonmetal-assembling dendrimer molecules in the two-dendrimers mixture monolayer

作者：Hirano Isao; Imaoka Takane; Yamamoto Kimihisa^*

来源：Polymers for Advanced Technologies, 2013, 24(10): 903-908.

DOI：10.1002/pat.3163

• dendrimers
• dendritic polyphenylazomethine
• metal-polymer complexes
• metal oxide nanoparticles
• dendrimer monolayer

Phenylazomethine dendrimers (DPA) can precisely incorporate metal chlorides onto the imine sites in a stepwise fashion. Such precise dendrimer-metal complexes allow the preparation of size-controlled subnanometer metal particles. We now propose a novel approach for the fabrication of size-controlled subnanometer metal oxide dots isolated on a substrate using two different-type dendrimers. One is a fourth-generation phenylazomethine dendrimer (DPAG4) and the other is a benzylether dendrimer (BzEG3) with a zinc porphyrin core. Even though the diameter of BzEG3 corresponds to that of DPAG4, BzEG3 has no metal-complexing site. Upon dip coating on a highly oriented pyrolytic graphite substrate by the mixed solution of the metal chloride-assembling DPAG4 molecules and BzEG3 molecules, the dendrimer monolayer was immobilized on the substrate. The concentration of the dendrimer mixture was determined in order to separate each DPAG4-metal chloride complex molecule by BzEG3. Monodispersed metaloxide nanodot arrays could be obtained from the dendrimer monolayer in which DPAG4-metal chloride complex molecule is well isolated by the BzEG3 as a spacer after the hydrolysis of metal chlorides followed by the complete removal of dendrimers.

• 出版日期2013-10