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US 12,490,657 B2Granted
Piezoelectric bio-organic films and fabrication method thereof
AssigneeCity University of Hong Kong
InventorsZhengbao Yang, Zhuomin Zhang, Xuemu Li
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AssigneeCity University of Hong Kong
InventorsZhengbao Yang, Zhuomin Zhang, Xuemu Li
Estimating the term…
A piezoelectric bio-organic films resembling ceramic-based piezoelectric films, and also a fabrication method thereof. In particular, the bio-organic piezoelectric films are formed by compact nanocrystals resembling the inorganic ceramic structure, where nanocrystallization on biomaterials and in-situ electric field are applied to facilitate domain orientation alignment across the entire films. The present fabrication method provides flexibility to tune various parameters of the resulting bio-organic films according to the needs, and therefore is substantially applicable to a wide range of biomaterials to form piezoelectric bio-organic films comparable to those formed by conventional piezoceramics in terms of piezoelectricity, thermostability and durability.
A piezoelectric bio-organic film comprising compact nanocrystals of one or more biomaterials formed by homogenous nucleation and in-situ electric field, the nanocrystals having an average grain size between 100 and 800 nm, and the piezoelectric bio-organic film having a piezoelectric strain constant from 5 to 15 pm/V, piezoelectric voltage constant of at least 150×10−3 V m/N, and a relative permittivity of less than 10, wherein the one or more biomaterials constituting the compact nanocrystals include one or more materials of glycine, L-alanine, DL-alanine, DL-threonine, DL-leucine, or L-Phenylalanine-L Phenylalanine.
Dependencies are inferred from the claim text.