An RF-Powered Self-Locating Flexible Building Environment Sensor System

Schwartz, David E.; Ladan, Shabnam; Venkatasubramanian, Vijay Karthik; Lee, Joseph; Mei, Ping; Krusor, B. S.; Smith, C.J.; Gowri, Shakthi Priya

doi:10.1109/wptc45513.2019.9055560

Cited by 1 publication

(1 citation statement)

References 4 publications

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“…For example, FPE sensors have been used to monitor heart rate [1], body temperature [2], and blood pressure [3], as well as other important rehabilitation metrics [4][5][6][7]. The additive quality of FPE allows scaling to large areas (many m 2 ) without material waste [8][9][10]. Additionally, the printing processes employed to fabricate FPE devices are typically roll-to-roll (R2R) compatible, allowing high-throughput production at low cost per unit area.…”

Section: Introductionmentioning

confidence: 99%

Self-aligned, inkjet-printed resistors on flexible substrates with excellent mechanical stability, high yield, and low variance

Hartnett,

Nguyen,

Francis

et al. 2024

Flex. Print. Electron.

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Resistors are basic yet essential circuit components that must be fabricated with high precision at low cost if they are to be viable for flexible electronic applications. Inkjet printing is one of many additive fabrication techniques utilized to realize this goal. In this work, a process termed self-aligned capillarity-assisted lithography for electronics (SCALE) was used to fabricate inkjet-printed resistors on flexible substrates. Capillary channels and reservoirs imprinted onto flexible substrates enabled precise control of resistor geometry and straightforward alignment of materials. More than 300 devices were fabricated using poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) as the resistive material and silver as the electrode material. By varying PEDOT:PSS ink formulation and resistor geometry, resistances spanning from 170 Ω to 3.8 MΩ were achieved. Over 98% of devices were functional and the standard deviation in resistance ranged from 3% to 18% depending on resistor length and ink composition. The resistors showed no significant change in resistance after 10,000 cycles of bend testing at 1.6% surface tensile strain. In summary, this work demonstrated a fully roll-to-roll (R2R) compatible process for inkjet printing resistors with superior properties.

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