This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:


peer-reviewed publication

trusted source


Researchers report technique to fabricate nanosheets in one minute

Researchers report technique to fabricate nanosheets in about one minute
High-quality 2D films could be one-drop away. Credit: Dr Minoru Osada

A research group led by Professor Minoru Osada (he, him) and postdoctoral researcher Yue Shi (she, her) at the Institute for Future Materials and Systems (IMaSS), Nagoya University in Japan, has developed a new technology to fabricate nanosheets, thin films of two-dimensional materials a couple of nanometers thick, in about one minute.

This technology enables the formation of high-quality, large films with a single click without the need for specialized knowledge or technology. Their findings are expected to contribute to developing the industrial manufacturing process for various types of nanosheet devices. The study was published in ACS Applied Materials & Interfaces.

Nanosheets have a thickness that is measured in nanometers. Nanometers are so thin that the sheets cannot be seen from the side with the naked eye. They have potential uses in several different fields, including electronics, catalysis, energy storage, and biomedicine. Those made from graphene and inorganic nanosheets are being tested for use in a range of devices, from to sensors and batteries, because they have electrical, transparency, and heat-resistance functions different from those of conventional bulk materials.

However, the current techniques used to fabricate these , such as the Langmuir-Blodgett method require skilled operation and complex conditions. "Using existing methods, it takes about one hour to fabricate a single layer," Osada said. "This creates a major bottleneck in nanosheet manufacturing."

The group aimed to develop a new process that can produce high-quality neatly tiled monolayer films of nanosheets easily and in a short time. They developed an automated film-forming process that produced nanosheets in about a minute with a simple drop of a colloidal aqueous solution onto a substrate heated on a hotplate using an automatic pipette. Afterwards, they followed this with aspiration of the solution and liquid removal. The result was a neatly tiled monolayer film with no gaps between the nanosheets.

"The reduction of the surface tension of the colloidal aqueous solution and the promotion of convection of the nanosheets suppressed the overlap and gaps between the nanosheets and allowed us control over its alignment," Osada said. "Layer-by-layer construction of multilayer films controlled by the thickness unit of nanosheets was possible by repeating the neatly tiled monolayer film fabrication operation."

"The newly developed method is expected to become an important technology as an industrial thin-film fabrication method and nano-coating method for nanosheets because it is simple, quick, and requires only a small amount of solution to fabricate a high-quality, large-area film with a neatly tiled alignment," he said.

"The technology is based on simple drop and aspiration operations using an automatic pipette and does not require specialized knowledge or technology. This technology is applicable to nanosheets of various compositions and structures, such as oxides, graphene, and , and can form films on substrates of various shapes, sizes, and materials, making it an extremely versatile film-forming technology," Osada said.

More information: Yue Shi et al, Automated One-Drop Assembly for Facile 2D Film Deposition, ACS Applied Materials & Interfaces (2023). DOI: 10.1021/acsami.3c02250

Provided by Nagoya University

Citation: Researchers report technique to fabricate nanosheets in one minute (2023, May 19) retrieved 7 June 2023 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Thinnest-ever freestanding film with ferroelectric properties


Feedback to editors