2025-04-25 東京大学
色の変化で力を可視化するウェアラブルセンサ
<関連情報>
ポリジアセチレンメカノクロミズムの面内異方性を利用した高感度ウェアラブルクロミック力センサー Highly Sensitive Wearable Chromic Force Sensor Utilizing In-Plane Anisotropy in Polydiacetylene Mechanochromism
Jianlu Zheng,Jiali Chen,Massimiliano Galluzzi,Yuge Hou,and Kaori Sugihara
Nano Letters Published: April 24, 2025
DOI:https://doi.org/10.1021/acs.nanolett.5c00085
Abstract
Force sensitivity is a crucial parameter in mechanochromic materials, determining their application range and practical success. In this study, we reveal an unexplored degree of freedom─in-plane anisotropy─for significantly enhancing the force sensitivity of polydiacetylene. Utilizing our newly developed dual nanofriction force/fluorescence microscopy setup, we discovered that force sensitivity reaches its peak when external forces are applied perpendicular to the polymer backbones in-plane. This phenomenon is explained by a “domino effect”, where point loads propagate along the backbones and affect the polymer structure even hundreds of nanometers from the contact point. Leveraging this finding, we developed a highly sensitive, stretchable force sensor and demonstrated that aligning polydiacetylene crystals perpendicular to the force direction increased the sensor’s sensitivity by up to 14-fold.
