Kun Yu , Wenyou Zhang , Jiakun Feng , Junyu Yue , Yi Ding , Qingxuan Liang , Yi Cao , Dichen Li , Jiankang He
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引用次数: 0
Abstract
Multi-material printing has recently gained extensive attention as an efficient strategy for the integrated fabrication of 3D heterogeneous structures with microscale conformal/embedded electronics in the field of antennas or metasurface. However, as one of the most popularly utilized multi-material printing processes, fused filament fabrication (FFF) commonly suffers from poor surface morphology, which poses a significant challenge for the subsequent deposition of conductive features with micro-resolution and stable conductivity. Here, we propose a novel multi-material printing strategy by combining coaxial electrohydrodynamic (CEHD) printing and FFF for the one-step fabrication of 3D heterogeneous structures with conformal or embedded microelectronics. It is found that the outer polyimide (PI) layer applied during the CEHD process can locally smooth the FFF-printed PEEK surfaces with varying roughness and enables the direct deposition of microscale core-shell conductive features with stable conductivity. Remarkably, the smallest conductive linewidth of Ag that can be achieved on an FFF-printed surface with a roughness of 23.57 ± 6.24 μm is 42.10 ± 3.45 μm, showing a conductivity of (0.32 ± 0.01) × 107 S/m. The proposed strategy demonstrates wide applicability across different substrate materials and geometries, and exhibits strong interfacial bonding strength and excellent electrical stability under different mechanical/physical conditions. More importantly, the presented multi-material printing technique offers great flexibility in integrally fabricating 3D heterogeneous structures with built-in microelectronics. The patterns of the embedded microelectronics exhibit a layer-specific variation, which demonstrates an innovative strategy to modulate the electromagnetic functionalities of the resultant heterogeneous structures. We envision that the proposed multi-material printing technique offers a unique capability to integrally fabricate mechanical/electrical structures with designed electromagnetic functionalities, enabling applications in curved conformal antennas and electromagnetic shielding devices.
期刊介绍:
Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects.
The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.