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⁻²) 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_th ≈−0.8 V), moderate transconductance (g_m ≈65 nS), and high ON–OFF ratio (≈10⁵). 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.

中文翻译：

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一种基于糊精的改性羧甲基纤维素的绿色高介电常数电介质

电子设备内的许多关键部件都是由不可再生、不可生物降解且具有潜在毒性的材料制成，从而导致环境破坏。为了与全球可持续发展目标保持一致，必须寻找替代的绿色介电材料。羧甲基纤维素（CMC）是一种源自纤维素的生物聚合物，具有优异的性能。本文制备了基于柠檬酸、糊精和CMC的水凝胶，该水凝胶具有生物相容性和可生物降解性，并具有类似橡胶的机械性能，杨氏模量值为0.89 MPa。因此，基于薄膜CMC的水凝胶被探索作为一种适合在低电压下运行的绿色高k电介质候选物，表现出高达78的高介电常数。这些制造的晶体管表现出稳定的高电容（2090 nF cm ^-2） ≈±3V 操作。本研究采用聚电解质型方法和聚（2-乙烯基蒽）（PVAn）表面改性，证明了薄介电层（d ≈30 nm）具有小电压阈值（V _th ≈−0.8 V）和中等跨导( g _m ≈65 nS) 和高开关比 (≈10 ⁵ )。此外，介电层在±3.5V偏置应力和100次开关测试下表现出稳定的性能。改性的基于 CMC 的水凝胶表现出作为低电压操作的绿色电介质的理想性能，进一步突出了其生物相容性。