Direct stamping of silver nanoparticles toward residue-free thick electrode

Abstract

Direct stamping of functional materials has been developed for cost-effective and process-effective manufacturing of nano/micro patterns. However, there remain several challenging issues like the perfect removal of the residual layer and realization of high aspect ratio. We have demonstrated facile fabrication of flexible strain sensors that have microscale thick interdigitated capacitors with no residual layer by a simple direct stamping with silver nanoparticles (AgNPs). Polyurethane (PU) prepolymer was utilized as an adhesive layer to transfer AgNPs more efficiently during the separation step of the flexible stamp from directly stamped AgNPs. Scanning electron microscopy images and energy dispersive x-ray spectroscopy analysis revealed residue-free transfer of microscale thick interdigitated electrodes onto two different flexible substrates (elastomeric and brittle) for the application to highly sensitive strain sensors.

Flexible temperature sensor with laser scribed graphene oxide

“…A PDMS (Polydimethylsiloxane) stamp is made by ablation of its surface with CO 2 Laser to have a predesigned pattern (trenches) on it. Silver nano particle ink has been synthesized by method described in previously published paper [6]. Then it is mixed with toluene to make nano ink and sprayed on the stamp by using airbrush.…”

Roll-to-Roll Apparatus for Residue-Free Direct Stamping of Functional Nano-Inks

“…There is no difference in the transferred inter-digitated pattern than manually transferred one reported previously [5]. The length (l) and width (w) of the finger electrode, the overlapping length (v) and gap (g) between two adjacent fingers were measured to be 500, 80, 400, and 40 μm, respectively.…”

“…Then the thin PDMS stamp is installed on the upper stamp web by an adhesive film. Silver nano-inks which is prepared by a method reported elsewhere [5] are prepared and sprayed to fill the PDMS stamp by aerosol sprayer. The rolls located in the middle between substrate and stamp roll are wrapped with adhesive films to prepare adhesive rolls for removal of residual layers from the stamp.…”

“…These direct patterning technologies of functional materials demonstrate successful formation of structures, but they still have limitations for high throughput manufacturing like high vacuum, high temperature, high pressure and continuous pretreatment of stamps. Recently, we have reported direct stamping of nano-inks to overcome those restrictions [5]. In this study, it is adapted for a high throughput roll-to-roll direct stamping process for cost-effective and process-effective manufacturing of functional nano/micro structures foe flexible electronics.…”

A Flexible Accelerometer System for Human Pulse Monitoring

“…%) is prepared as silver nano ink. AgNPs are synthesized as previously reported [8]. Then, silver nano ink is directly sprayed onto top and bottom pre-patterned membranes.…”