Silk fibroin and ultra-long silver nanowire based transparent, flexible and conductive composite film and its Temperature-Dependent resistance

Abstract

A transparent, conductive, smooth, and temperature sensitive thin films was fabricated and characterized in this paper. Silk fibroin could be processed into transparent thin films, which can act as ideal opto-electronic substrates. As pure silk fibroin film is nonconductive, ultra-long silver nanowires coating and platinum sputtering were used to strengthen its conductivity. Ultra-long nanowires were used to reduce the junctions between wires, and platinum was to improve the conductivity of the film. The new nanowire-metal-organic composite film possesses excellent conductivity and good transmittance. The composite films containing different silver nanowires exhibit conductivities of as low as 6.9 X/sq, and transmittance of 60-80% in the visible light range. The films also showed potentials in practical applications as their resistance is almost linearly temperaturedependent. It also can transfer power to electrical devices. The new composite films could be expected to function in wearable electronics or implantable devices and sensors.

A highly sensitive strain sensor with a sandwich structure composed of two silver nanoparticles layers and one silver nanowires layer for human motion detection

“…Therefore, the use of WSC is beneficial to achieve a large GF. The UV-optical absorption spectrum of the strain sensor was also collected, showing a broad peak around 400 nm (figure S1(b)) [37][38][39], indicating the formation of AgNPs in the latex balloon. The sensor was cut into strips to perform a convenient test (figure 1(b)).…”

Heterogeneous Wafer Bonding Technology and Thin-Film Transfer Technology-Enabling Platform for the Next Generation Applications beyond 5G

“…This technology also provides new opportunities for growing and emerging fields, such as sensors, energy harvesting, flexibles electronics, photonics, and MEMS, etc. [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ].…”

Silk Fibroin as Sustainable Advanced Material: Material Properties and Characteristics, Processing, and Applications

“…[30,51,103,179] Films thickness is highly controllable, and it could vary from a few tens of nanometers to hundreds of microns. [30] In general, the use of mild conditions during SF solution casting (room temperature and humidity) results in films with dense and smooth surfaces (roughness below 50-60 nm), [180,181] high transparency (>90% in the visible region), high refractive index (between 2 and 1 at wavelengths from 500 to 800 nm respectively) [103,179] and wave-guiding properties (≈2.8 dB mm −1 ). [182] Also, by controlling casting conditions, it is possible to induce changes in film nanostructure, [55] increase the ultimate tensile strength [93] and induce major β-crystals formation (by using polar solvents or increasing the casting temperature).…”