Triggered Transience of Metastable Poly(phthalaldehyde) for Transient Electronics
Triggered Transience of Metastable Poly(phthalaldehyde) for Transient Electronics
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DOI：
10.1002/adma.201403045
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发表时间：
2014-12-03
影响因子：
29.4
通讯作者：
White, Scott R.
中科院分区：
文献类型：
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作者：
Hernandez, Hector Lopez;Kang, Seung-Kyun;White, Scott R.
据我们所知，以前的努力集中在实现与浸没在生物流体或水溶液中的设备的瞬态。这限制了这些装置的应用，因为系统的生命周期仅由初始制造时选择的材料的溶解速率控制，并且对基于溶液的降解的依赖性在很大程度上消除了非生物应用。亚稳态聚合物，如具有低上限温度（Tc）的聚合物，和自分解聚合物，它可以通过特定的刺激（触发）迅速解聚，提供了一个通用的新途径材料选择，提供精确的控制寿命的瞬态设备和扩展的瞬态设备的实用性超出溶解方法。[11-14]我们设想了一种独特的方法，用于各种触发刺激（如湿度，温度或光线）的电子产品的按需物理瞬态。这些亚稳态聚合物必须满足几个技术标准：i）显示出作为微电子封装的基底或密封剂的合适性能，ii）经历使电子器件失活的环境触发的解聚，以及iii）允许可调的降解动力学。在迄今报道的亚稳态聚合物中，根据需要物理或功能分解的瞬态电子器件具有潜在的应用，例如生物医学诊断、远程环境传感器和具有时间功能轮廓的多功能器件。具有瞬态特性的材料的开发对于该技术的进步及其潜在应用至关重要。Hwang等人展示了用Mg电极、MgO栅电极、Si纳米膜半导体和丝衬底成功制造的生物可吸收装置。[1]以前的工作集中在演示各种瞬态器件，如高性能互补金属氧化物半导体（CMOS）晶体管，硅太阳能电池，应变/温度传感器，数字成像设备和无线电力收集系统，以及机械能采集器和致动器。[1-5]还有各种用于电极的金属，如Mo，W，Zn和Fe;以及用于封装和钝化材料的金属，如SiO2和SiNx。[6，7]此外，已经提出了几种可生物降解的聚合物，例如聚己内酯、聚（乙醇酸）、聚（乳酸）、聚（乳酸-共-乙醇酸），作为用于瞬时降解的合适底物。
To the best of our knowledge, previous efforts have focused on achieving transience with devices submerged in a biofluid or aqueous solution. This limits the application of these devices because the life-cycle of the system is solely controlled by the dissolution rate of the materials selected at initial fabrication and the dependence on solution-based degradation largely eliminates non-biological applications. Metastable polymers, such as those with low ceiling temperatures (Tc), and selfimmolative polymers, which can be depolymerized rapidly by specific stimuli (triggers), offer a versatile new avenue for materials selection, providing precise control over the lifetime of the transient device and expanding the utility of transient devices beyond dissolution methods alone.[11–14] We envisage a unique approach towards on-demand physical transience of electronics for a variety of triggering stimuli, such as humidity, temperature, or light. These metastable polymers must fulfill several technical criteria: i) displaying suitable performance as a substrate or encapsulant for microelectronic packaging, ii) undergoing environmentally triggered depolymerization that deactivates the electronics, and iii) allowing for tunable degradation kinetics. Among the metastable polymers reported to date, Transient electronic devices that physically or functionally disintegrate on demand have potential applications, such as biomedical diagnostics, remote environmental sensors, and multifunctional devices with temporal functional profiles. The development of materials with transient properties is critical for the advancement of this technology and its potential application. Hwang et al. demonstrated bioresorbable devices that were successfully fabricated with Mg electrodes, MgO gate dielectrics, Si nano-membrane semiconductor, and silk substrates.[1] Previous work has focused on demonstrating various classes of transient devices such as high-performance complementary metal-oxide-semiconductor (CMOS) transistors, Si solar cells, strain/temperature sensors, digital-imaging devices, and wireless power-scavenging systems, as well as mechanical energy harvesters and actuators.[1–5] There is also a variety of metals for electrodes, such as Mo, W, Zn, and Fe; and for encapsulation and passivation materials, such as SiO 2 and SiN x.[6, 7] Additionally, several biodegradable polymers, such as polycaprolactone, poly (glycolic acid), poly (lactic acid), poly (lactic-co-glycolic acid), have been proposed as suitable substrates for transient