4.6 Article

Flexible ultraviolet detector with robust ZnO nanoparticle nanoassemblies on catechol-functionalized polysiloxane nanofilms

Journal

JOURNAL OF APPLIED POLYMER SCIENCE
Volume 138, Issue 37, Pages -

Publisher

WILEY
DOI: 10.1002/app.50947

Keywords

adhesives; nanoparticles; nanowires and nanocrystals; sensors and actuators

Funding

  1. Ogasawara Foundation for the Promotion of Science Engineering

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The study developed a catechol-containing polysiloxane adhesive to firmly anchor ZnO nanoparticles on plastic substrates for flexible UV detector applications, demonstrating outstanding mechanical stability and stable photo-response performance even after repeated bending. The results indicate the promising potential of polycyclosiloxane-based flexible devices for wearable detector applications.
As a result of the vast Young's moduli difference between an inorganic semiconducting channel and flexible substrates, flexible optoelectronic devices readily lose their functionality through material delamination and local fracturing, which lead to short-circuiting of devices. For this study, we synthesized a catechol-containing polysiloxane (CFPS) adhesive and applied it to ZnO nanoparticle (NP) assembly on plastic substrates for flexible UV detector applications. The 30 nm thick CFPS adhesive can anchor 70 nm thick ZnO NPs strongly through a coordination bond, thereby forming an ultra-stable ZnO NP channel layer. A peeling test of ZnO NP layer was conducted using transparent tape (Scotch (R); 3 M Inc.). The ZnO NPs were firmly immobilized, reflecting the outstanding mechanical stability of CFPS adhesives. A UV detector also exhibited stable photo-response performance even after a thousand iterations of bending with 3 mm curvature radii. The result indicates the polycyclosiloxane-based flexible device as promising for wearable detector applications.

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