Fabrication and characterization of conductive silk fibroin–gold nanocomposite films

Ranjana, R.; Parushuram, N.; Harisha, K. S.; Asha, S.; Narayana, B.; Mahendra, M.; Sangappa, Y.

doi:10.1007/s10854-019-02485-5

Cited by 20 publications

(12 citation statements)

References 53 publications

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“…polypyrrole [ 13 ]) and nanomaterials (e.g. carbon nanotubes [ 14 ], silver nanowires [ 15 ] or gold nanoparticles [ 16 ]) into silk fibroin. As an alternative to ILs, ionotronic materials using metal ions and water, are also interesting options to generate silk fibroin conducting materials [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Synergy between silk fibroin and ionic liquids for active gas-sensing materials

Moreira¹,

Esteves²,

Palma³

et al. 2022

Materials Today Bio

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Section: Introductionmentioning

confidence: 99%

Synergy between silk fibroin and ionic liquids for active gas-sensing materials

Moreira¹,

Esteves²,

Palma³

et al. 2022

Materials Today Bio

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“…A charge hopping mechanism for the electrical conductivity in SF/gold nanocomposite has been reported in the literature 48 . This mechanism is widely used to explain the conductivity in disordered or amorphous material.…”

Section: Resultsmentioning

confidence: 98%

“…The conductivity of regenerated SF films reported in the literature lies in the range 10 −9 -10 −15 S cm −1 . 38,48 The conductivities of pure SF with 30, 50, 70, 100 and 200 μm thickness were observed to be 3.58 × 10 −5 , 3.45 × 10 −5 , 3.26 × 10 −5 , 2.97 × 10 −5 and 2.74 × 10 −5 S cm −1 respectively. The films show higher conductivity at lower thickness due to better orientation of the polymeric chains at lower film thickness.…”

Section: Electrical Conductivity Of Sf/tio 2 Nanocomposite Filmsmentioning

confidence: 97%

“…A charge hopping mechanism for the electrical conductivity in SF/gold nanocomposite has been reported in the literature. 48 This mechanism is widely used to explain the conductivity in disordered or amorphous material. The protein conformation plays a significant role in developing the conducting pathways by forming a charge transfer complex on the interaction of the hydroxyl groups of SF and gold nanoparticles which reduces the barrier height between the tapping sites (active sites of molecular chain), facilitating the charge hopping mechanism in SF for conductivity.…”

Section: Electrical Conductivity Of Sf/tio 2 Nanocomposite Filmsmentioning

confidence: 99%

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N‐type silk fibroin/TiO₂ nanocomposite transparent films: electrical and optical properties

Yadav

Batra

Bansal

et al. 2021

Polymer International

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This paper highlights the effect of different concentrations of titanium dioxide (TiO2) nanoparticles on the electrical and optical properties of silk fibroin (SF). TiO2 based SF nanocomposite films were prepared using the solvent casting method. Uniform dispersion and agglomeration of nanoparticles, in nanocomposite films, were observed by field emission SEM. The conductivity of pure SF and nanocomposite films was determined by a four‐point probe and the TiO2 nanoparticles were found to bring high conductivity to the nanocomposite films. Dielectric strength improved with the addition of nanoparticles to the SF matrix. Dielectric constant and capacitance of the pure SF and nanocomposite films were measured using an LCR meter, which showed a 10‐fold enhancement on the addition of nanoparticles in SF. A very unusual property, i.e. negative resistance, was observed during LCR meter analysis for the nanocomposite films for a particular range of frequency (200–550 kHz), voltage (1 V) and current (0.5–1.5 μA). TiO2 nanoparticles changed the semiconducting behavior of the SF films from p‐type to n‐type as measured by the Hall effect experiment. The optical properties of pure SF and nanocomposite films were measured using a UV–visible spectrophotometer. The increased concentration of nanoparticles in the SF has effectively enhanced the absorbing coefficient, refractive index and percentage transmittance and reduced the bandgap energy. These SF/TiO2 nanocomposite films have shown the potential to be used as dielectric and high refractive index material for optoelectronics applications. © 2021 Society of Industrial Chemistry.

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“…In addition, as demonstrated by Shi et al, combining these conductive fillers with other proteins only enhances their compatibility with silk. With recent advances in fabrication of conductive nanocomposite silk films, [70] the specificity of silk binding motifs [52] and myriad of different types of spider silks, insect silks, and crustacean silks to choose from, there is a large number of untapped potential of silk materials for future flexible electronics.…”

Section: Silk Materials In Flexible Electronicsmentioning

confidence: 99%

The Power of Silk Technology for Energy Applications

Strassburg

Zainuddin

Scheibel

2021

Advanced Energy Materials

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The energy demands that support modern industries and lifestyles are largely fulfilled by the burning of fossil fuels, [1] whose greenhouse gas by-products are a major contributing cause of global warming. [2] It has become clear that the combustion of fossil fuels at the current scale is unsustainable and more sustainable alternative energy sources must be explored to offset the contribution of fossil fuels. [3] Solar energy has an important role to play in this transition. Solar irradiation available on Earth's surface per hour far exceeds the annual global energy demand. [4] However, adaptation to solar energy has been slow due to a number of factors, such as rare or hazardous raw materials, high sensitivity to water, and short life spans. [5] Compared to the fossil fuel, which can be burned on demand, solar irradiation is subject to fluctuations caused by many factors such as weather conditions, time of the day, time of the year, and latitude. [6] Because storing solar radiation in its original form, that is, electromagnetic waves, is prohibitively difficult, its conversion prior to storage is necessary. Biological systems developed 3.5 billion years ago [7] as a process to use sunlight to drive chemical reactions through photosynthesis. Specifically, oxygenic photosynthesis, which occurs in most plants, algae, and cyanobacteria, converts carbon dioxide from the atmosphere into carbohydrates. These carbohydrates form dense and portable packets of chemical energy that can be released through cellular respiration whenever needed.The first step in following nature's example in turning light energy to chemical energy was enabled with the discovery of the photovoltaic effect by Edmond Becquerel in 1839, [8] in which the current generated by an electrochemical cell increased upon exposure to light. The first photovoltaic cells in the 19th century were based on pure metal species and exhibited low efficiencies. [9] Major efficiency improvements came in the 20th century with the incorporation of semiconductor materials into photovoltaic cells but they remained bulky and difficult to manufacture. [9] A breakthrough came in the 1980s with the advent of thin film solar cells which largely solved this problem. [9] Despite many advances, solar cells have a limited lifetime, and once their efficiencies have dropped to a no longer useful level, disposal becomes an issue due to the difficulty of recycling component materials. In addition, energy storage is often a major concern due to the limited number of hours per day photovoltaic devices are exposed to solar irradiation. Thus, Silk fibers are a remarkable material made of proteins possessing excellent mechanical properties that match or even outperform, in some aspects, high performance fibers such as Kevlar and steel. Silk proteins can be further produced recombinantly, allowing the possibility for genetic modification, enhancing silks' already impressive range of benefits. Thus far, little research has explored the possibility of incorporating silk-based materials in el...

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Fabrication and characterization of conductive silk fibroin–gold nanocomposite films

Cited by 20 publications

References 53 publications

Synergy between silk fibroin and ionic liquids for active gas-sensing materials

Synergy between silk fibroin and ionic liquids for active gas-sensing materials

N‐type silk fibroin/TiO₂ nanocomposite transparent films: electrical and optical properties

The Power of Silk Technology for Energy Applications

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Fabrication and characterization of conductive silk fibroin–gold nanocomposite films

Cited by 20 publications

References 53 publications

Synergy between silk fibroin and ionic liquids for active gas-sensing materials

Synergy between silk fibroin and ionic liquids for active gas-sensing materials

N‐type silk fibroin/TiO2 nanocomposite transparent films: electrical and optical properties

The Power of Silk Technology for Energy Applications

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N‐type silk fibroin/TiO₂ nanocomposite transparent films: electrical and optical properties