Premium
Naturally Derived Melanin Nanoparticle Composites with High Electrical Conductivity and Biodegradability
Author(s) -
Eom Taesik,
Jeon Jisoo,
Lee Seunghyeon,
Woo Kyungbae,
Heo Jae Eun,
Martin David C.,
Wie Jeong Jae,
Shim Bong Sup
Publication year - 2019
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201900166
Subject(s) - materials science , bioelectronics , nanoparticle , vinyl alcohol , biodegradation , composite material , nanotechnology , microstructure , annealing (glass) , polymer , biosensor , chemistry , organic chemistry
The development of electronic devices from naturally derived materials is of enormous scientific interest. Melanin, a dark protective pigment ubiquitous in living creatures, may be particularly valuable because of its ability to conduct charges both electronically and ionically. However, device applications are severely hindered by its relatively poor electrical properties. Here, the facile preparation of conductive melanin composites is reported in which melanin nanoparticles (MNPs), directly extracted from squid inks, form electrically continuous junctions by tight clustering in a poly(vinyl alcohol) (PVA) matrix. Prepared as freestanding films and patterned microstructures by a series of precipitation, dry casting, and post‐thermal annealing steps, the percolated composites show electrical conductivities as high as 1.17 ± 0.13 S cm −1 at room temperature, which is the best performance yet obtained with biologically‐derived nanoparticles. Furthermore, the biodegradability of the MNP/PVA composites is confirmed through appetitive ingestion by Zophobas morios larvae (superworms). This discovery for preparing versatile biocomposites suggests new opportunities in functional material selections for the emerging applications of implantable, edible, green bioelectronics.