One Pot Self-Assembling Fe@PANI Core-Shell Nanowires for Radar Absorption Application

Chung-Kwei Lin; Yuh-Jing Chiou; Sheng-Jung Tsou; Chih-Yi Chung; Chen-Chun Chao; Ruey-Bing Yang

doi:10.3390/nano13061100

One Pot Self-Assembling Fe@PANI Core-Shell Nanowires for Radar Absorption Application

Nanomaterials (Basel). 2023 Mar 19;13(6):1100. doi: 10.3390/nano13061100.

Authors

Chung-Kwei Lin^{1

2}, Yuh-Jing Chiou³, Sheng-Jung Tsou³, Chih-Yi Chung³, Chen-Chun Chao³, Ruey-Bing Yang⁴

Affiliations

¹ Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan.
² School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan.
³ Department of Chemical Engineering and Biotechnology, Tatung University, Taipei 104, Taiwan.
⁴ Department of Aerospace and Systems Engineering, Feng Chia University, Taichung 407, Taiwan.

Abstract

The one-pot process, which combines the polymerization of polyaniline (i.e., PANI) with subsequent reduction of iron nanowire (i.e., Fe NW) under a magnetic field, was developed to produce Fe@PANI core-shell nanowires. The synthesized nanowires with various PANI additions (0-30 wt.%) were characterized and used as microwave absorbers. Epoxy composites with 10 wt.% absorbers were prepared and examined using the coaxial method to reveal their microwave absorbing performance. Experimental results showed that the Fe NWs with PANI additions (0-30 wt.%) had average diameters ranging from 124.72 to 309.73 nm. As PANI addition increases, the α-Fe phase content and the grain size decrease, while the specific surface area increases. The nanowire-added composites exhibited superior microwave absorption performance with wide effective absorption bandwidths. Among them, Fe@PANI-90/10 exhibits the best overall microwave absorption performance. With a thickness of 2.3 mm, effective absorption bandwidth was the widest and reached 3.73 GHz, ranging from 9.73 to 13.46 GHz. Whereas with a thickness of 5.4 mm, Fe@PANI-90/10 reached the best reflection loss of -31.87 dB at 4.53 GHz.

Keywords: iron nanowire; one pot and radar absorption; polyaniline.

Grants and funding

The authors gratefully acknowledge the years of grants from the Taiwan National Science and Technology Council (109-2221-E-036-004, 111-2926-I-036-501-G, and 111-2221-E-038-020-MY3) and Tatung University (B111-C01-006) for financially supporting for this work.