Enhancement of Mechanical Properties of Multilayer Ceramic Capacitors through a BaTiO3/polydopamine Cover Layer

To fabricate multilayer ceramic capacitors (MLCCs) that can withstand external impacts, technologies to achieve excellent adhesion and mechanical strength of the cover layer should be essentially developed. Low adhesion and strength of the cover layer can lead to delamination and cracks in the MLCC,...

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Published inPolymers Vol. 15; no. 19; p. 4014
Main Authors Park, Yong, Park, Jung Jin, Park, Kwan Soo, Hong, Yong Min, Lee, Eun Jung, Kim, Sang Ouk, Lee, Jong Ho
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 07.10.2023
MDPI
Subjects
Adhesive strength
Barium titanates
BaTiO3
Bond strength
Capacitors
cover layer
Crack propagation
Graphene
Insulation
Mechanical properties
Moisture resistance
multilayer ceramic capacitor
Multilayers
polydopamine
Polyethylene terephthalate
Polymers
Transmission electron microscopy
United States > US
South Korea
Japan
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Summary:To fabricate multilayer ceramic capacitors (MLCCs) that can withstand external impacts, technologies to achieve excellent adhesion and mechanical strength of the cover layer should be essentially developed. Low adhesion and strength of the cover layer can lead to delamination and cracks in the MLCC, respectively. In this study, we present a method for applying polydopamine (PDA), a mussel-inspired adhesive protein, for as robust cover layer on an MLCC. Barium titanate (BT) particles treated with PDA increase the dispersion stability of the BT/PDA slurry, preventing re-agglomeration of the particles and enhancing the adhesiveness and strength owing to the cohesive properties of PDA. Compared to the BT layer, the adhesion of the BT/PDA layer was significantly enhanced by 217%; consequently, the compression modulus of the BT/PDA cover layer increased by 29.4%. After firing, the N-doped graphitic PDA played an important role in producing an MLCC cover layer with increased hardness and toughness. Furthermore, the N-doped graphitic PDA with a hydrophobic surface forms tortuous moisture paths in the cover layer, preventing the degradation of insulation resistance of the MLCC.
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These authors have contributed equally to this work.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym15194014