Direct Writing on Paper of Foldable Capacitive Touch Pads with Silver Nanowire Inks

Abstract

Paper-based capacitive touch pads can be fabricated utilizing high-concentration silver nanowire inks needle-printed directly onto paper substrates through a 2D programmable platform. Post deposition, silver nanowire tracks can be photonically sintered using a camera flash to reduce sheet resistance similar to thermal sintering approaches. Touch pad sensors on a variety of paper substrates can be achieved with optimized silver nanowire tracks. Rolling and folding trials, which yielded only modest changes in capacitance and no loss of function, coupled with touch pad functionality on curved surfaces, suggest sufficient flexibility and durability for paper substrate touch pads to be used in diverse applications. A simplified model to predict touch pad capacitance variation ranges with differing touch conditions was developed, with good agreement against experimental results. Such paper-based touch pads have the advantage of simple structure, easy fabrication, and fast sintering, which holds promise for numerous commercial applications including low-cost portable devices where ultrathin and lightweight features, coupled with reliable bending stability are desirable.

Ag Nanowire and Nanoplate Composite Paste for Low Temperature Bonding

“…Based on the experiment, an optimized preceding temperature of 80°C can be achieved with a bonding strength of 16.2 MPa and a resistivity of 5.3 m³ m. This low bonding temperature with high bonding strength and low resistivity displays a great advantage using Ag NPL/NW for flexible organic electronics packaging and interconnection. 3,4) The formation of ferroconcrete structure is also responsible for the high bonding strength. Figure 5 shows SEM images of cracks produced perpendicular to the fracture surfaces.…”

Research Progress in Flexible Wearable Electronic Sensors

“…以 ZnO 和 ZnS 为代表的无机半导体材料由于其出 色的压电特性, 在可穿戴柔性电子传感器领域显示出了 广阔的应用前景 [7] . 一种基于直接将机械能转换为光学 信号的柔性压力传感器被开发出来 [36] (见图 3 [38] .…”

“…柔性可穿 戴电子传感器的信号转换机制主要分为压阻 [6] 、电容 [7] 和压电 [8] 三大部分. 近年来为了实时扫描动态压力和发 展可拉伸的能量收集器件, 基于力致发光 [9] 、摩擦发 电 [10] 机制的传感器受到了高度关注(见图 1).…”

Pencil-on-Paper Capacitors for Hand-Drawn RC Circuits and Capacitive Sensing

“…Transistors, luminescent displays, solar cells, batteries, capacitive touch pads, and super capacitors have all been demonstrated through sophisticated printing and/or coating methods used to deposit various organic or inorganic materials onto the surface of the paper substrate [3][4][5][6][7][8][9][10]. While these efforts certainly demonstrate the scope of what is possible using paper as a canvas for more traditional fabrication methods, other groups have begun using specialty papers or even graphite from pencils as a conductor to draw or connect circuit components.…”