Affiliation:
1. Manufacturing Science and Instrumentation CSIR‐Central Scientific Instruments Organisation Chandigarh Chandigarh India
2. Academy of Scientific and Innovative Research Ghaziabad Uttar Pradesh India
3. Green Engineered Materials and Additive Manufacturing Division CSIR‐Advanced Materials and Processes Research Institute Bhopal Madhya Pradesh India
Abstract
AbstractIn this work, we have synthesized the zinc‐aluminum layered double hydroxide (ZnAl LDH) nanostructures using cost‐effective hydrothermal technique. The ZnAl LDH and graphene‐based poly(vinyl alcohol) (PVA) nanocomposites are fabricated. The crystal structure, morphology, thermal, and dielectric properties of pristine PVA and ZnAl LDH and graphene‐based PVA nanocomposites films were investigated using X‐ray diffraction, HR‐transmission electron microscopy, thermo gravimetric analysis, and impedance analyzer. HRTEM analysis reveals the hexagonal nanoplates shape‐like morphology of Zn‐Al layered double hydroxides with an average thickness of 40–50 nm and size of 400–600 nm. High thermal stability was observed from ZnAl LDH and graphene‐reinforced nanocomposite. Enhanced thermal stability of 250°C and low weight loss was observed from ZnAl LDH reinforced PVA‐based nanocomposites compared to pristine PVA. Zn‐Al LDH nanoplates‐graphene‐PVA based nanocomposites showed ultra‐high dielectric constant (ɛ′) of 794 as compared to the ZnAl LDH‐PVA nanocomposites (ɛ′ ~ 334) and pristine PVA sample (ɛ′ ~ 35). Low dielectric loss of 0.27, 0.18, 0.38 was observed for pristine PVA, ZnAl‐LDH‐PVA and ZnAl‐LDH‐graphene‐PVA nanocomposites. The large enhancement of the dielectric constant and thermal stability were discussed in terms of improved crystallinity, interfacial polarization and formation of nanodipoles in the matrix. This study reveals a significant role of LDH‐graphene‐based hybrid nanocomposites in optoelectronics, energy storage, sensors, energy conversion and thermally stable devices.Highlights
Growth of highly crystalline zinc‐aluminum layered double hydroxide nanostructures.
Improved thermal stability for Zn‐Al LDH‐graphene‐PVA nanocomposites.
High thermal stability from ZnAl LDH‐based PVA nanocomposites.
Ultra‐high dielectric constant of 794 is observed from Zn‐Al LDH nanoplates‐graphene‐nanocomposites.
Funder
Council of Scientific and Industrial Research, India
Subject
Materials Chemistry,Marketing,Polymers and Plastics,General Chemical Engineering,General Chemistry
Cited by
1 articles.
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