Improving piezoelectric performance of lead-free polymer composites with high aspect ratio BaTiO3 nanowires

2016 ◽  
Vol 53 ◽  
pp. 143-148 ◽  
Author(s):  
Woongchul Choi ◽  
Kyungwho Choi ◽  
Gang Yang ◽  
Jae Chul Kim ◽  
Choongho Yu
Keyword(s):  
Aspect Ratio ◽  
Polymer Composites ◽  
High Aspect Ratio ◽  
Lead Free ◽  
Piezoelectric Performance

scholarly journals Microfabrication of High-Aspect Ratio KNN Lead-Free Piezoceramic Pillar Arrays by Aqueous Gelcasting

Ceramics ◽  
2020 ◽  
Vol 3 (3) ◽  
pp. 287-296
Author(s):  
Cailing Wu ◽  
Benke Li ◽  
Xiaofeng Wang ◽  
Feng Ji ◽  
Dou Zhang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Lead Free ◽  
Solid Loading ◽  
High Mechanical Strength ◽  
Pillar Array ◽  
Novel Approach ◽  
Pillar Arrays ◽  
Gelcasting Process

The present paper reported a novel approach for the fabrication of a high-aspect ratio (K, Na)NbO3 (KNN) piezoelectric micropillar array via epoxy gelcasting, which involves the in situ consolidation of aqueous KNN suspensions with added hydantoin epoxy resin on a polydimethylsiloxane (PDMS) soft micromold. KNN suspensions with solid loadings of up to 45.0 vol.% have rheological behavior, which was suitable for the gelcasting process. The uniform green KNN bodies derived from the optimized suspension of 42.0 vol.% solid loading and 15.0 wt.% resin had exceptionally high mechanical strength (9.14 MPa), which was responsible for the integrity of the piezoceramic micropattern structure. The square-shaped KNN piezoelectric pillar array with lateral dimensions of up to 5 μm and an aspect ratio of up to five was successfully fabricated.

Simulating the effective electric conductivity of polymer composites with high aspect ratio fillers

2016 ◽  
Vol 132 ◽  
pp. 16-23 ◽  
Author(s):  
Fritjof Nilsson ◽  
Johannes Krückel ◽  
Dirk W. Schubert ◽  
Fei Chen ◽  
Mikael Unge ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Electric Conductivity ◽  
Polymer Composites ◽  
High Aspect Ratio

Dice-and-fill processing and characterization of microscale and high-aspect-ratio (K, Na)NbO3-based 1–3 lead-free piezoelectric composites

2016 ◽  
Vol 42 (9) ◽  
pp. 10745-10750 ◽  
Author(s):  
Muhammad Saleem Mirza ◽  
Qing Liu ◽  
Tariq Yasin ◽  
Xiaomei Qi ◽  
Jing-Feng Li ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Lead Free ◽  
Piezoelectric Composites

Topochemical Synthesis of High-Aspect-Ratio Lead-Free (K, Na)NbO3 Plate-Like Structures

2018 ◽  
Vol 281 ◽  
pp. 622-627
Author(s):  
Li Qian Cheng ◽  
Mei Feng ◽  
Kai Chen
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Raw Materials ◽  
Piezoelectric Materials ◽  
Three Dimensional ◽  
Piezoresponse Force Microscopy ◽  
Lead Free ◽  
Layered Perovskite ◽  
Single Crystalline ◽  
Average Size

Single crystalline lead-free (K, Na)NbO3 (KNN) nanostructures have attracted much attention for the high piezoelectricity and environmental compatibility. Especially, the plate-like KNN structures are supposed to be utilized in the synthesis of textured KNN-based ceramics. The KNN plate-like templates were prepared by a two-step molten salt reaction. The layered-perovskite Bi2.5Na3.5Nb5O18 (BNN5) was first prepared by using Bi2O3, Nb2O5, Na2CO3, NaCl as raw materials. The BNN5 precursors possess high aspect ratio with an average size of 15 - 20 μm in width and 0.5 - 1 μm in thickness. Then Bi element in the BNN5 was replaced by Na/K through topochemical reaction, and KNN plate-like products which have anisotropic crystal structure were fabricated. It should be emphasized that piezoresponse force microscopy (PFM) was used to confirm three-dimensional (3-D) morphology, while piezoelectric properties of single crystalline KNN platelets were acquired simultaneously. The as-synthesized KNN structures are expected to play an important role in the study of textured KNN ceramics. Meanwhile, the methodology investigated in this paper can also be applied for further fundamental studies on KNN system as well as other lead-free piezoelectric materials.

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