A Green High-k Dielectric from Modified Carboxymethyl Cellulose-Based with Dextrin

Leon Lukhas Santoso, Suhendro Purbo Prakoso, Hai Khue Bui, Qi An Hong, Ssu Yu Huang, Tai Chin Chiang, Kuan Yeh Huang*, Siti Nurkhamidah*, Dewi Tristantini*, Yu Cheng Chiu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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 (Vth ≈−0.8 V), moderate transconductance (gm ≈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.

Original languageEnglish
JournalMacromolecular Rapid Communications
Publication statusAccepted/In press - 2024


  • carboxymethyl cellulose-based hydrogels
  • high-k dielectrics
  • polyelectrolytes
  • surface modifications
  • thin film dielectric materials


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