Fabrication of nanostructured materials with photo-functionalities via self-assembly

Takayoshi Sasaki (Managing Director, National Institute for Materials Science)

Research area: Development of Advanced Nanostructured Materials for Energy Conversion and Storage (FY2002-2007)
Development of 2D nanomaterials with molecule-level thickness
Drastically reducing environmental load through reducing the energy demands of electronic devices and realization of antifouling nanocoating.

Research Overview
A two-dimensional crystal made of titanium oxide or other substances with a thickness of approximately 1 nm has been synthesized through a unique process known as layer exfoliation. A technique to create ultra-thin film has been developed, by which nanosheets are layered one by one in an aqueous solution using wet processes. Its applications are diverse, including photocatalytic self-cleaning coating and dielectric film that functions at nano-level thickness.

Impact of Research Achievements
The controllability and orderliness of nanostructures comparable to those of artificial lattice thin films have been attained through a simple, low-cost wet process.
■ The performance of photocatalytic film has been assessed using test vehicles with the aim of applying it to the windows of Shinkansen trains. Application in antifouling coating and others can also be expected.
■ Research on dielectric film has grown into joint research activities with semiconductor manufacturers.

nanosheet colloid suspension, nanosheet (AFM image)photocatalytic film dielectric film
nanosheet colloid suspension     nanosheet (AFM image) photocatalytic film dielectric film