Department of Chemical Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Da'an Dist., Taipei, 10607, Taiwan.
Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei, 10617, Taiwan.
Macromol Rapid Commun. 2024 Jun;45(12):e2400059. doi: 10.1002/marc.202400059. Epub 2024 Apr 5.
Many crucial components inside electronic devices are made from non-renewable, non-biodegradable, and potentially toxic materials, leading to environmental damage. Finding alternative green dielectric materials is mandatory to align with global sustainable goals. Carboxymethyl cellulose (CMC) is a bio-polymer derived from cellulose and has outstanding properties. Herein, citric acid, dextrin, and CMC based hydrogels are prepared, which are biocompatible and biodegradable and exhibit rubber-like mechanical properties, with Young modulus values of 0.89 MPa. Hence, thin film CMC-based hydrogel is explored as a suitable green high-k dielectric candidate for operation at low voltages, demonstrating a high dielectric constant of up to 78. These fabricated transistors reveal stable high capacitance (2090 nF cm) for ≈±3 V operation. Using a polyelectrolyte-type approach and poly-(2-vinyl anthracene) (PVAn) surface modification, this study demonstrates a thin dielectric layer (d ≈30 nm) with a small voltage threshold (V ≈-0.8 V), moderate transconductance (g ≈65 nS), and high ON-OFF ratio (≈10). Furthermore, the dielectric layer exhibits stable performance under bias stress of ± 3.5 V and 100 cycles of switching tests. The modified CMC-based hydrogel demonstrates desirable performance as a green dielectric for low-voltage operation, further highlighting its biocompatibility.
许多电子设备内部的关键组件都是由不可再生、不可生物降解且可能有毒的材料制成的，这导致了环境破坏。寻找替代的绿色介电材料是符合全球可持续发展目标的必要条件。羧甲基纤维素（CMC）是一种从纤维素衍生而来的生物聚合物，具有出色的性能。在此，制备了基于柠檬酸、糊精和 CMC 的水凝胶，它们具有生物相容性和可生物降解性，并表现出橡胶状的机械性能，杨氏模量值为 0.89 MPa。因此，探索基于薄膜 CMC 的水凝胶作为适用于低电压操作的合适绿色高介电常数候选材料，其介电常数高达 78。这些制造的晶体管在 ≈±3 V 的工作电压下显示出稳定的高电容（2090 nF cm）。通过使用聚电解质型方法和聚（2-乙烯基蒽）（PVAn）表面修饰，本研究展示了一种具有小电压阈值（V ≈-0.8 V）、适度跨导（g ≈65 nS）和高 ON-OFF 比（≈10）的薄介电层（d ≈30 nm）。此外，该介电层在 ± 3.5 V 的偏置应力和 100 次开关测试循环下表现出稳定的性能。改性基于 CMC 的水凝胶作为用于低压操作的绿色介电材料表现出良好的性能，进一步突出了其生物相容性。
