Two-Dimensional Piezoelectric MoS₂-Modulated Nanogenerator and Nanosensor Made of Poly(vinlydine Fluoride) Nanofiber Webs for Self-Powered Electronics and Robotics

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• 作者：Kuntal Maity ; Biswajit Mahanty ; Dr. Tridib Kumar Sinha ; Samiran Garain ; Anirban Biswas ; Sujoy Kumar Ghosh ; Dr. Smarajit Manna ; Prof. Samit K. Ray and Dr. Dipankar Mandal
• 刊名：Energy Technology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：5
• 期：2
• 页码：234-243
• 全文大小：2592K
• ISSN：2194-4296

文摘

With the widespread use of wearable electronics, portable and flexible energy harvesting devices with a high sensitivity have attracted considerable interest. Herein, an ultrasensitive piezoelectric nanogenerator (PNG) made of a few layers of 2 D-MoS₂-incorporated electrospun poly(vinlydine fluoride) (PVDF) nanofiber webs (NFW) is described for the first time. As a result of the semiconducting properties and piezoelectric functionalities of 2 D-MoS₂, the resultant piezoelectric performance of PNG can be modulated, which leads to a material suitable for wearable electronics to power devices and to fabricate self-powered biomedical nanosensors for diagnosis, such as heartbeat monitoring, pressure mapping from footsteps, and speech signal abnormality. We have demonstrated that our PNG has a 70 times improvement in acoustic sensitivity than nanosensors made of neat PVDF NFW and are able to charge a capacitor quickly (e.g., 9 V is charged within 44 s). As a result of the ultrafast charging performance and external low-impact detection capability of 2 D-MoS₂-modulated PNG, this paves the way to design cost-effective self-powered wearable electronics and robotics.