A stretchable and breathable form of epidermal device based on elastomeric nanofibre textiles and silver nanowires

Abstract

A breathable and stretchable form of electronic nanotextile is developed as a platform for epidermal devices.

A New Class of Electronic Devices Based on Flexible Porous Substrates

“…The thickness and uniformity of the coating can be controlled by the spray speed, the number of sprayed layers, the distance between substrate and spray nozzle, and the droplet size. [ 25a ] Numerous porous substrates including paper, [ 38 ] cotton fabric, [ 116 ] electrospinning PU textile, [ 128 ] and porous PDMS [ 153 ] have been functionalized by spray coating to fabricate electrodes for TENG and various sensors. As shown in Figure 11d , Ag NWs were spray‐coated on a porous elastomer to construct multifunctional on‐skin electronics for sensing electrophysiological signals, temperature, hydration, and pressure.…”

“…Dip-coating PANI, [42] Ag NWs, [ 110] RGO, CNTs, [ 126] carbon nanofibers [ 127] Simple, low-cost, uniform thin layer with a large coverage area Elaborate procedures and environmentally unfriendly chemicals, a lot of material waste Spray coating MWCNT, [ 116] Ag NWs [ 128] Cheap, simple, high material usage…”

Cyber–Physiochemical Interfaces

“…Besides design strategies on the molecular level, nano or micro‐materials, including particles, nanowires (NWs), 2D materials and their composites, are able to dynamically tune the strain distribution via conductive nano/micro networks. For example, based on silver nanoparticles (Ag NPs), a printable elastic conductor was reported to exhibit conductivity higher than 4000 S cm −1 at 0% strain and 935 S cm −1 when exposed to 400% strain (Figure c).…”

Ultrathin, Stretchable, and Breathable Epidermal Electronics Based on a Facile Bubble Blowing Method

“…The electrospinning technique shows great potential in fabricating porous substrates with good breathability; however, the attainment of nanoscale-thick devices with this method requires subsequent processing steps because the prepared freestanding nanofiber membrane is usually limited to a micron thickness. [32][33][34] Moreover, time-consuming processes and the need for expensive specialized equipment greatly restrict its extensive application.…”

“…As shown in Figures S11 and S12, Supporting Information, a patterned silver nanowire (AgNW) thin film was spray printed on a silicon wafer covered with a shadow mask, which was then in intimate contact with a viscous and hydrophobic (109°, Figure S13, Supporting Information) TPE nanomembrane under uniform pressure provided by a nitrogen flow, and the pattern was intact when transferred to the TPE nanomembrane based on the larger adhesion force between the AgNW film and TPE nanomembrane. [37,38] AgNW thin film was employed as the functional electrode layer due to its good biocompatibility (researchers have employed AgNW as the skin-attached flexible electrode, [32][33][34] and provided www.advelectronicmat.de evidences that AgNW neither irritant to the skin nor penetrate into the deeper layer of the epidermis [39] ), as well as superior mechanical, optical, and electrical properties. [32,40] A detailed description of the preparation process is given in the Experimental Section, and a schematic of the process is illustrated in Figure S11, Supporting Information.…”