Journal
NANO ENERGY
Volume 49, Issue -, Pages 655-666Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2018.05.014
Keywords
Spider silk; Piezoresponse force microscopy; Bio-piezoelectricity; SSBPNG; Energy conversion efficiency
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Funding
- Department of Science and Technology (DST) Govt. of India [IF130632]
- National Research Foundation of Korea (NRF) - Korean government [2013R1A3A2042196]
- National Research Foundation of Korea [2013R1A3A2042196] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Spider silk fibers having remarkable protein sequence structure contain nature's most outstanding mechanical properties and unrivalled elasticity along with biocompatibility and biodegradability. Unfortunately, it remains completely unidentified how the mechanical properties of spider silk effectively contribute to the performance and integrity on piezoelectric nanogenerator. Here, using piezoresponse force microscopy (PFM), we report for the first time structure-dependent piezoelectric response of the spider silk at the molecular level and confirm that silk fiber shows vertical (or out of the plane) piezoelectric coefficient of up to similar to 0.36 pm/V. We also design a mechanically robust piezoelectric nanogenerator (PNG) using nature driven spider silk that exhibits high energy conversion efficiency (approximate to 66%), high output voltage (approximate to 21.3 V) and current (approximate to 0.68 mu A) with instantaneous power density of approximate to 4.56 mu W/cm(2). The fabricated device is biocompatible and ultra-sensitive towards physiological signal monitoring such as arterial pulse response which can be useful for potential biomedical applications.
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