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RISS 인기검색어
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- 저자 : Anirban Maitra (검색결과 2 건)
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Nature driven spider silk as high energy conversion efficient bio-piezoelectric nanogenerator
Karan, Sumanta Kumar,Maiti, Sandip,Kwon, Owoong,Paria, Sarbaranjan,Maitra, Anirban,Si, Suman Kumar,Kim, Yunseok,Kim, Jin Kon,Khatua, Bhanu Bhusan Elsevier 2018 Nano energy Vol.49 No.-
<P><B>Abstract</B></P> <P>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 ~ 0.36 pm/V. We also design a mechanically robust piezoelectric nanogenerator (PNG) using nature driven spider silk that exhibits high energy conversion efficiency (≈ 66%), high output voltage (≈ 21.3 V) and current (≈ 0.68 μA) with instantaneous power density of ≈ 4.56 μW/cm<SUP>2</SUP>. 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.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spider-silk (SS) shows vertical piezoelectric coefficient (≈ 0.36 pm/V) as confirmed by PFM. </LI> <LI> Nature driven spider silk as an effective bio-piezoelectric nanogenerator (SSBPNG). </LI> <LI> SSBPNG shows power density (≈ 4.56 μW/cm<SUP>2</SUP>) and energy conversion efficiency (≈ 66%). </LI> <LI> Multiple devices in series connection can generate 65 V and turn on 55 LEDs. </LI> <LI> One-dimensional (1D) wire type SSBPNG could be as a promising textile nanogenerator. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P> <B>This study provides an in-depth insight of naturally abundant spider silk as bio-piezoelectric material.</B> We have successfully shown that spider silk has a definite vertical piezoelectric coefficient (∼ 0.36 pm/V) through PFM experiment which is newly added information to the existing piezoelectric history on silk. The fabricated energy harvester with energy conversion efficiency of ≈ 66%, reveals high output performance with instantaneous power density of ≈ 4.56 μW/cm<SUP>2</SUP>.</P> <P>[DISPLAY OMISSION]</P>
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