Triggered Transience of Metastable Poly(phthalaldehyde) for Transient Electronics

Hernandez, Hector Lopez; Kang, Seung Kyun; Lee, Olivia P.; Hwang, Suk Won; Kaitz, Joshua A.; İnci, Bora; Park, Chan Woo; Chung, Sang‐Jin; Sottos, Nancy R.; Moore, Jeffrey S.; Rogers, John A.; White, Scott R.

doi:10.1002/adma.201403045

Cited by 180 publications

(255 citation statements)

References 27 publications

(30 reference statements)

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“…H. L. Hernandez reported the dissolution of the substrate and thus destruction of the electronics through UV illumination 9 , and C. H. Lee reported wirelessly controlled releasing of etching solution in microfluidic system for on-demand chemical dissolution 15 . Thermal induced shrinkage of the electrospun PCL based electronics can also be implemented with on-demand destruction ability.…”

Section: Resultsmentioning

confidence: 99%

Thermally Triggered Mechanically Destructive Electronics Based On Electrospun Poly(ε-caprolactone) Nanofibrous Polymer Films

Gao

Sim

Yan

et al. 2017

Sci Rep

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Electronics, which functions for a designed time period and then degrades or destructs, holds promise in medical implants, reconfigurable electronic devices and/or temporary functional systems. Here we report a thermally triggered mechanically destructive device, which is constructed with an ultra-thin electronic components supported by an electrospun poly(ε-caprolactone) nanofibrous polymer substrate. Upon heated over the melting temperature of the polymer, the pores of the nanofibers collapse due to the nanofibers’ microscopic polymer chain relaxing and packing. As a result, the polymer substrate exhibits approximately 97.5% area reduction. Ultra-thin electronic components can therefore be destructed concurrently. Furthermore, by integrating a thin resistive heater as the thermal trigger of Joule heating, the device is able to on-demand destruct. The experiment and analytical results illustrate the essential aspects and theoretical understanding for the thermally triggered mechanical destructive devices. The strategy suggests a viable route for designing destructive electronics.

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Section: Resultsmentioning

confidence: 99%

Thermally Triggered Mechanically Destructive Electronics Based On Electrospun Poly(ε-caprolactone) Nanofibrous Polymer Films

Gao

Sim

Yan

et al. 2017

Sci Rep

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“…[5,12] These stimuli can be humidity, heat, light or mechanical stress, and the degradation kinetics can be tuned by material composition. [5,12] These stimuli can be humidity, heat, light or mechanical stress, and the degradation kinetics can be tuned by material composition.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

“…Low-ceiling temperature polymers, which can be kinetically stabilized at room temperature by end-capping or cyclization of polymer chain and depolymerized by backbone bond cleavage under external stimuli, serve as great candidates for transient materials. [5,12,15] Transient power sources including both energy storage devices and energy harvesters, however, are indispensable for a fully transient electronic system. Diesendruck et al realized a mechanochemically triggered autonomic remodeling system using high molecular weight PPHA that can go through the depolymerization-repolymerization cycle similar to biological tissues.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

Sunlight‐Triggerable Transient Energy Harvester and Sensors Based on Triboelectric Nanogenerator Using Acid‐Sensitive Poly(phthalaldehyde)

Jiang

Guo

et al. 2019

Adv Elect Materials

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operation. [5] They have found potential applications as medical diagnostic and therapeutic devices that can resorb into the body, environmental sensors that do not require recovery after data collection, and consumer devices that can be easily disposed without hazards. [6] The potential feature of disappearance with minimal or non-traceable remains also enables transient electronics to find opportunities in privacy or security applications where stealth is required or reverse engineering needs to be avoided. The transience property is largely attributed to the triggerable degradation of device substrates and encapsulation, which are typically made of a group of materials called transient polymers. Depending on constituting material, the transience can be achieved either through material dissolution or depolymerization. Pioneering efforts on transient electronics focused on solution dissolution of polymer matrix. Bioresorbable polymers such as silk, polycaprolactone, poly(glycolic acid), and poly(L-lactide-co-glycolide), were used as substrates, [7][8][9] and biocompatible, implantable devices such as transistor, [1] ring oscillators, [10] and energy harvesters, [11] have been demonstrated. The lifetime of such devices is controlled by the dissolution rate of the materials in the surrounding aqueous solution, making them unsuitable for non-biological applications. Transient electronics that disintegrate via material dissolution or depolymerization under certain stimuli have great potential in biomedical and military applications. The triboelectric nanogenerator (TENG), an emerging mechanical energy harvesting technology with great flexibility in material choices, is promising in offering transient power sources. Previously reported transient energy harvesters using biodegradable polymers require solutionbased degradation and have limited applications in non-biological scenarios. A short time span, sunlight-triggered degradable TENG is developed. The main substrate includes an acid-sensitive poly(phthalaldehyde) (PPHA), a photoacid generator (PAG), and a photosensitizer (PS). Through photoinduced electron transfer, the ultraviolet radiation absorbed by the PS istransferred to the PAG to generate photoacids that trigger the depolymerization of PPHA. Transient TENG-based mechanical energy harvesters and touch/acoustic sensors are successfully demonstrated by embedding silver nanowires onto the PPHA-based films. The fabricated devices degrade rapidly under winter sunlight. The degradation rate can be further tuned via changing the ratio of photosensitive agents. This work not only broadens the applicability of TENG as transient power sources and sensors, but also extends the use of transient functional polymers toward advanced energy and sensing applications.

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“…[46] UV emission from the UCNPs in the PAG solution decreases dramatically as the PAG concentration increases (Figure 3e) due to UV absorption by the PAG (left blue peaks in Figure S11d Supporting Information), whereas blue emission from the UCNPs, which is not absorbed by the PAG (right blue peaks in Figure S11d, Supporting Information), maintains its original intensity (Figure 3f). [46] UV emission from the UCNPs in the PAG solution decreases dramatically as the PAG concentration increases (Figure 3e) due to UV absorption by the PAG (left blue peaks in Figure S11d Supporting Information), whereas blue emission from the UCNPs, which is not absorbed by the PAG (right blue peaks in Figure S11d, Supporting Information), maintains its original intensity (Figure 3f).…”

Section: Doi: 101002/adma201603169mentioning

confidence: 99%

Ultra‐Wideband Multi‐Dye‐Sensitized Upconverting Nanoparticles for Information Security Application

et al. 2016

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Triggered Transience of Metastable Poly(phthalaldehyde) for Transient Electronics

Cited by 180 publications

References 27 publications

Thermally Triggered Mechanically Destructive Electronics Based On Electrospun Poly(ε-caprolactone) Nanofibrous Polymer Films

Thermally Triggered Mechanically Destructive Electronics Based On Electrospun Poly(ε-caprolactone) Nanofibrous Polymer Films

Sunlight‐Triggerable Transient Energy Harvester and Sensors Based on Triboelectric Nanogenerator Using Acid‐Sensitive Poly(phthalaldehyde)

Ultra‐Wideband Multi‐Dye‐Sensitized Upconverting Nanoparticles for Information Security Application

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