Electricity from the Silk Cocoon Membrane

Tulachan, Brindan; Meena, Sunil Kumar; Kumar, Ratan; Mallick, Chandrakant; Kusurkar, Tejas Sanjeev; Teotia, Arun Kumar; Sethy, Niroj Kumar; Bhargava, Kalpana; Bhattacharya, Shantanu; Kumar, Ashok; Sharma, Raj Kishore; Sinha, Neeraj; Singh, Sushil Kumar; Das, Mainak

doi:10.1038/srep05434

Cited by 72 publications

(65 citation statements)

References 73 publications

(185 reference statements)

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“…The elemental composition of coated and uncoated silk fiber is presented in Figure and Table . Silk fibroin fibers display the typical distribution of major elements present in other silks with calcium, oxygen, chlorine, nitrogen, and sodium being the most abundant . In contrast, the presence of carbon, oxygen, chloride, and iron was observed for pure PPY samples (Figure b), which is in good agreement with the structure of this polymer and its method of synthesis, as iron doping is expected to occur.…”

Section: Resultssupporting

confidence: 66%

Fabrication and Characterization of Conductive Conjugated Polymer‐Coated Antheraea mylitta Silk Fibroin Fibers for Biomedical Applications

Kong

Gautrot

et al. 2017

Macromolecular Bioscience

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Conductive polymers are interesting materials for a number of biological and medical applications requiring electrical stimulation of cells or tissues. Highly conductive polymers (polypyrrole and polyaniline)/Antheraea mylitta silk fibroin coated fibers are fabricated successfully by in situ polymerization without any modification of the native silk fibroin. Coated fibers characterized by scanning electron microscopy confirm the silk fiber surface is covered by conductive polymers. Thermogravimetric analysis reveals preserved thermal stability of silk fiber after coating process. X-ray diffraction of degummed fiber diffraction peaks at around 2θ = 20.4 and 16.5 confirms the preservation of the β-sheet structure typical of degummed silk II fibers. This phenomenon implies that both polypyrrole and polyaniline chains form interactions with peptide linkages in degummed fiber macromolecules, without significantly disrupting protein assembly. Fourier transform infrared spectroscopy of coated fibers indicates hydrogen bonding and electrostatic interactions exist between silk fibroin macromolecules and conductive polymers. Resulting fibers display good conductive properties compared to corresponding conjugated polymers. In vitro analysis (live/dead assay) of the behavior of human immortalized keratinocytes (HaCaTs) on coated fibers demonstrates improved cell-adhesive properties and viability after polymers coating. Hence, polypyrrole- and polyaniline-coated A. mylitta silk fibers are suitable for application in cell culture and for tissue engineering, where electrical conduction properties are required.

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Section: Resultssupporting

confidence: 66%

Fabrication and Characterization of Conductive Conjugated Polymer‐Coated Antheraea mylitta Silk Fibroin Fibers for Biomedical Applications

Kong

Gautrot

et al. 2017

Macromolecular Bioscience

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“…141 Fully understanding, and emulating, these attributes remains an ongoing pursuit, as research continues to reveal the novel, potentially useful, properties of natural silks beyond their well-known mechanical performance. 142 In the quest of a spider-like silk fiber, it is important to note that reproducing the precise mechanical properties of native spider silk may not necessarily be useful. First, spider silk has evolved as a single-use material, which is perhaps its greatest weakness as a commercial fiber.…”

Section: Discussionmentioning

confidence: 99%

With great structure comes great functionality: Understanding and emulating spider silk

et al. 2014

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The overarching aim of biomimetic approaches to materials synthesis is to mimic simultaneously the structure and function of a natural material, in such a way that these functional properties can be systematically tailored and optimized. In the case of synthetic spider silk fibers, to date functionalities have largely focused on mechanical properties. A rapidly expanding body of literature documents this work, building on the emerging knowledge of structure-function relationships in native spider silks, and the spinning processes used to create them. Here, we describe some of the benchmark achievements reported until now, with a focus on the last five years. Progress in protein synthesis, notably the expression on full-size spidroins, has driven substantial improvements in synthetic spider silk performance. Spinning technology, however, lags behind and is a major limiting factor in biomimetic production. We also discuss applications for synthetic silk that primarily capitalize on its nonmechanical attributes, and that exploit the remarkable range of structures that can be formed from a synthetic silk feedstock.

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“…Bombyx mori ) with several unique properties, which have been recognized as making it a suitable choice for high performance advanced devices such as memory devices, bio‐flexible devices and optical devices . In this context, natural silk fibroin (NSF) is known as a flourishing bio‐protein material which has revealed outstanding properties for bio‐integrated electronic, biomedical, energy and flexible electronic device applications . Usually, NSF is extracted from the naturally available cocoon of the Bombyx mori silkworm.…”

Section: Introductionmentioning

confidence: 99%

Bio‐industrial Waste Silk Fibroin Protein and Carbon Nanotube‐Induced Carbonized Growth of One‐Dimensional ZnO‐based Bio‐nanosheets and their Enhanced Optoelectronic Properties

Saravanan

Huang

Kathiravan

2018

Chemistry A European J

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High performance UV/Visible photodetectors are successfully fabricated from ZnO/fibroin protein-carbon nanotube (ZFP ) composites using a simple hydrothermal method. The as-fabricated ZnO nanorods (ZnO NRs) and ZFP nanostructures were measured under different light illuminations. The measurements showed the UV-light photoresponse of the as-fabricated ZFP nanostructures (55,555) to be approximately 26454 % higher than that of the as-prepared ZnO NRs (210). This photodetector can sense photons with energies considerably smaller (2.75 eV) than the band gap of ZnO (3.22 eV). It was observed that the finest distribution of fibroin and CNT into 1D ZnO resulted in rapid electron transportation and hole recombination via carbon/nitrogen dopants from the ZFP . Carbon dopants create new energy levels on the conduction band of the ZFP , which reduces the barrier height to allow for charge carrier transportation under light illumination. Moreover, the nitrogen dopants increase the adsorptivity and amount of oxygen vacancies in the ZFP so that it exhibits fast response/recovery times both in the dark and under light illumination. The selectivity of UV light among the other types of illumination can be ascribed to the deep-level energy traps (E ) of the ZFP . These significant features of ZFP lead to the excellent optical properties and creation of new pathways for the production of low-cost semiconductors and bio-waste protein based UV/Visible photodetectors.

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Electricity from the Silk Cocoon Membrane

Cited by 72 publications

References 73 publications

Fabrication and Characterization of Conductive Conjugated Polymer‐Coated Antheraea mylitta Silk Fibroin Fibers for Biomedical Applications

Fabrication and Characterization of Conductive Conjugated Polymer‐Coated Antheraea mylitta Silk Fibroin Fibers for Biomedical Applications

With great structure comes great functionality: Understanding and emulating spider silk

Bio‐industrial Waste Silk Fibroin Protein and Carbon Nanotube‐Induced Carbonized Growth of One‐Dimensional ZnO‐based Bio‐nanosheets and their Enhanced Optoelectronic Properties

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