1. Dielectric behaviour of montmorillonite/cyanoethylated cellulose nanocomposites.
- Author
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Madusanka, Nadeesh, Shivareddy, Sai G., Eddleston, Mark D., Hiralal, Pritesh, Oliver, Rachel A., and Amaratunga, Gehan A.J.
- Subjects
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CELLULOSE , *DIELECTRIC properties , *SONICATION , *THIN films , *METAL-insulator-metal structures , *ATOMIC force microscopy - Abstract
A dielectric nanocomposite based oncyanoethylatedcellulose (CRS) and MMT nanoclay was successfully prepared with different weight percentages (5%, 10% and 15%) of MMT. MMT nanoplatets obtained via sonication of MMT nanoclay in acetone for a prolonged period was used in the preparation of CRS-MMT nanocomposites. CRS-MMT thin films on SiO 2 /Si wafers are used to form metal-insulator-metal (MIM) type capacitors. At 1 kHz CRS-MMT nanocomposites exhibited high dielectric constants (ε r ) of 71, 55 and 42 with low leakage current densities (10 −6 –10 −7 A/cm 2 ) for nanocomposites with 5%, 10% and 15% weight of MMT respectively, higher than values of pure CRS (21), Na-MMT(10). Reduction of ε r with higher MMT loading can be attributed to a network formation as evidenced via strong bonding interactions between CRS and MMT leading to a lower molecular mobility. The leakage is studied using conductive atomic force microscopy (C-AFM) indicates that leakage pathways are associated with MMT nanoplatelets embedded in the CRS polymer matrix. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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