Molecular Suturing Enabled Strong and Ultrahigh-Responsivity Janus 2D Semiconductor Fibers for Self-Powered Wearable...

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Semiconductor heterostructure fibers (SHF) are key for wearable optoelectronics.
• Current SHFs face challenges with structural defects hindering performance.

Purpose of the Study:

• To develop a novel strategy for constructing high-performance SHF.
• To improve carrier transport, mechanical properties, and device reliability.

Main Methods:

• A molecular suturing strategy using 1,5-Naphthalenedithiol (NTD) was employed.
• NTD acted as a carrier viaduct and mechanical solder to engineer defects in Janus WSe2/MoS2 SHF.

Main Results:

• Achieved meter-scale Janus WSe2/MoS2 SHF with aligned, densified, and interconnected heterointerfaces.
• Demonstrated over 16-fold higher responsivity and 2 orders of magnitude faster photoresponse speed.
• Exhibited excellent bending robustness and enhanced tensile strength.

Conclusions:

• The molecular suturing strategy effectively addresses defects in SHF.
• Developed a wearable self-powered photoplethysmography sensing platform for long-term biosignal tracking.
• Provides a scalable approach for advanced wearable fiber optoelectronics.