Fabrication of Highly Dense Silk Fibroin Biomemristor Array and Its Resistive Switching Characteristics,Advanced Materials Technologies

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Fabrication of Highly Dense Silk Fibroin Biomemristor Array and Its Resistive Switching Characteristics
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-02-24 , DOI: 10.1002/admt.201900991
Geon Kook ₁ , Sohyeon Jeong _{2,

3} , Mi Kyung Kim ₁ , Sungwoo Lee ₁ , Nakwon Choi _{2,

3,

4} , Hyunjoo J. Lee _{1,

5,

6}

Affiliation

Development of polymeric memristors is of great interest for wearable and implantable applications because of its flexibility and transparency. One of distinguished polymeric memristor materials is silk fibroin, which is a biodegradable protein extracted from Bombyx mori cocoons. However, fibroin memristors demonstrated earlier show low memory cell density (<100 cells mm⁻²). In this paper, silk fibroin memristors with cell density 25 times higher than that of the previously reported silk fibroin memristors by utilizing wafer‐scale UV photolithography are reported. Unlike shadow masking technique adopted in the previous researches, UV photolithography allows single‐micrometer‐scale alignment between layers to obtain a much denser structure. Memristive characteristics of the silk fibroin memristors are studied under different values of compliance current during SET process with different thickness of silk fibroin films. The ON/OFF ratio of the fabricated memristors is maintained over 1000 s of measurement, and remains the same during bending over a cylinder with a radius of curvature of 1.3 mm. It is shown that silk fibroin remains biocompatible and biodegradable after undergoing the fabrication process. Demonstrated transparency and lightweight characteristics are desirable for electronic components for wearable and implantable systems.

中文翻译：

高密度丝素蛋白生物忆阻器阵列的制备及其电阻转换特性

聚合物忆阻器的开发由于其柔性和透明性而在可穿戴和可植入应用中引起了极大的兴趣。一个杰出的聚合忆阻器材料是丝纤蛋白，它是从提取的可生物降解的蛋白家蚕的茧。但是，先前证明的丝蛋白忆阻剂显示出低的记忆细胞密度（<100个细胞mm ^-2）。在本文中，通过使用晶圆级UV光刻技术，发现了丝素蛋白忆阻剂的细胞密度是以前报道的丝素蛋白忆阻剂的25倍。与先前研究中采用的阴影掩膜技术不同，UV光刻技术允许层之间的单微米级对齐以获得更致密的结构。在不同厚度的丝素蛋白膜的SET过程中，在顺应电流值不同的情况下，研究了丝素蛋白忆阻剂的忆阻特性。制成的忆阻器的ON / OFF比率在1000 s的测量时间内保持不变，并且在弯曲半径为1.3 mm的圆柱体上弯曲时保持不变。结果表明，丝素蛋白在经过制造过程后仍具有生物相容性和可生物降解性。

更新日期：2020-02-24

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