Issue

Vol. 19 (2027)

Rheologically Engineered 3D-Printed Highly Loaded Magneto-Dielectric Absorbers for Device-Level Electromagnetic Compatibility

https://doi.org/10.1007/s40820-026-02312-7
Yuheng Jiang
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Zihao Chen
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Xiao Sun
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Haotian Li
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Jinlong Xie
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Yueting Li
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Xiaolei Nie
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Feng Lan
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Yaxin Zhang
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
Qiye Wen
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China

Corresponding Author: Qiye Wen

qywen@uestc.edu.cn

Nano-Micro Letters, Vol. 19 (2027), Article Number: 13

Abstract

Highly loaded magneto-dielectric composite systems are promising for achieving strong electromagnetic loss and structural design flexibility, yet their processability and geometric controllability remain extremely challenging. Herein, a rheologically engineered direct ink writing (DIW) 3D printing strategy is developed. Graphene (Gr) is introduced to reconstruct the particle-loading network, which synergistically improves the ink’s yield behavior, shear-thinning property, structural recovery, and a magnetic–dielectric synergistic loss system is constructed with carbonyl iron powder (CIP). The critical CIP content (~ 84.06 wt%) is determined by the yield model, and a tunable Gr/CIP (GC) composite ink is obtained. The correlation among rheological response, geometric fidelity, and temporal stability is established, enabling high-fidelity 3D-printed gradient honeycomb structures. The rationally designed 3D-printed GC honeycomb (GCH) absorber achieves an effective absorption bandwidth of 18 GHz–4 THz, with an RLmin of − 84.30 dB at a thickness of 2.6 mm. When integrated into device-level terahertz reconfigurable intelligent surfaces (RIS), the GCH absorber contributes to a ~ 3.3 dBi main lobe gain enhancement, 1.9–3.3 dB sidelobe suppression, and a ~ 58% reduction in reflection beamwidth, showing excellent electromagnetic compatibility performance for communication, imaging, and radar. This work offers a practical strategy for the structural fabrication and device integration of high-load magneto-dielectric synergistic absorbers.


Highlights:
1 A rheologically engineered approach enables the 3D printing of high-loading (~84.06 wt%) magneto-dielectric composite inks, with quantitative composition–rheology–printability relationships established.
2 3D-printed GC honeycomb (GCH) absorber achieves ultra-broadband absorption covering 18 GHz–4 THz, with reflection loss (RL) ≤ − 10 dB and RLmin of − 84.30 dB in the terahertz band.
3 The monolithic integration of the GCH absorber with a terahertz reconfigurable intelligent surface delivers a 3.3 dBi increase in main lobe gain and ~58% reduction in specular reflection beamwidth.

Keywords

Direct ink writing (DIW) 3D printing Rheologically engineered Highly loaded composite inks Magneto-dielectric composite Ultra-broadband absorption
Jiang, Yuheng, Zihao Chen, Xiao Sun, Haotian Li, Jinlong Xie, Yueting Li, Xiaolei Nie, Feng Lan, Yaxin Zhang, and Qiye Wen. 2026. “Rheologically Engineered 3D-Printed Highly Loaded Magneto-Dielectric Absorbers for Device-Level Electromagnetic Compatibility”. Nano-Micro Letters 19 (July):13. https://doi.org/10.1007/s40820-026-02312-7.
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