2023-04-06 デューク大学(Duke)
薄膜トランジスターは最初に作られたプリントエレクトロニクスで、環境に優しいプリントエレクトロニクスの製造に向けた示唆を与えた。また、回路に必要な多層化に関して、これまで以上に努力をする必要があるとしている。
＜関連情報＞
- https://pratt.duke.edu/about/news/water-recyclable-printed-electronics
- https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.2c04196
水性インク印刷でオールカーボン薄膜トランジスタを実現 All-Carbon Thin-Film Transistors Using Water-Only Printing
Shiheng Lu, Brittany N. Smith, Hope Meikle, Michael J. Therien, and Aaron D. Franklin
Nano Letters February 28, 2023
DOI:https://doi.org/10.1021/acs.nanolett.2c04196
Abstract
Printing thin-film transistors (TFTs) using nanomaterials is a promising approach for future electronics. Yet, most inks rely on environmentally harmful solvents for solubilizing and postprint processing the nanomaterials. In this work, we demonstrate water-only TFTs printed from all-carbon inks of semiconducting carbon nanotubes (CNTs), conducting graphene, and insulating crystalline nanocellulose (CNC). While suspending these nanomaterials into aqueous inks is readily achieved, printing the inks into thin films of sufficient surface coverage and in multilayer stacks to form TFTs has proven elusive without high temperatures, hazardous chemicals, and/or lengthy postprocessing. Using aerosol jet printing, our approach involves a maximum temperature of 70 °C and no hazardous chemicals─all inks are aqueous and only water is used for processing. An intermittent rinsing technique was utilized to address the surface adhesion challenges that limit film density of printed aqueous CNTs. These findings provide promising steps toward an environmentally friendly realization of thin-film electronics.
