世界初の木製トランジスタ(The world’s first wood transistor)

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2023-04-28 リンショーピング大学

リンショーピング大学とKTH王立工科大学の研究者たちは、世界で初めて木材で作られたトランジスタを開発しました。この研究は、PNAS誌に掲載され、木材ベースのエレクトロニクスや電子植物の制御の更なる開発の道を開くことになります。
彼らはバルサ材を使用してトランジスタを作り、導電性プラスチックを注入することで連続的な機能と電気流の制御を実現しました。将来的な応用を促進する基礎的な研究であり、電子植物の調整などが可能であると考えられています。

<関連情報>

木材電気化学トランジスタの電流変調特性 Electrical current modulation in wood electrochemical transistor

Van Chinh Tran,Gabriella G. Mastantuoni,Marzieh Zabihipour,Lengwan Li,Lars Berglund,Magnus Berggren,Qi Zhou and Isak Engquist
Proceedings of the National Academy of Sciences  Published:April 24, 2023
DOI:https://doi.org/10.1073/pnas.2218380120

Significance

The orthotropic 3D microstructure has recently promoted wood as a template for applications in wood-based energy and electronic devices. Different varieties of electroconductive wood are widely reported; however, modulating the wood’s electrical conductivity without changing its chemical composition has not been done and remains challenging. In this work, we present an approach to preparing conductive wood (CW), in which the electrical conductivity can be modulated using an external potential. This has resulted in a transistor where all three terminals are made of conductive wood and which can be operated continuously at the selected conductivity without being limited by, e.g., saturation effects. We expect this device and concept will be a stepping stone for the development of wood-based electrical components.

Abstract

The nature of mass transport in plants has recently inspired the development of low-cost and sustainable wood-based electronics. Herein, we report a wood electrochemical transistor (WECT) where all three electrodes are fully made of conductive wood (CW). The CW is prepared using a two-step strategy of wood delignification followed by wood amalgamation with a mixed electron-ion conducting polymer, poly(3,4-ethylenedioxythiophene)–polystyrene sulfonate (PEDOT:PSS). The modified wood has an electrical conductivity of up to 69 Sm−1 induced by the formation of PEDOT:PSS microstructures inside the wood 3D scaffold. CW is then used to fabricate the WECT, which is capable of modulating an electrical current in a porous and thick transistor channel (1 mm) with an on/off ratio of 50. The device shows a good response to gate voltage modulation and exhibits dynamic switching properties similar to those of an organic electrochemical transistor. This wood-based device and the proposed working principle demonstrate the possibility to incorporate active electronic functionality into the wood, suggesting different types of bio-based electronic devices.

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