Jiye Qiu,Xiangwei Wang,Yong Ma,Zhiwei Yu,Tingxi Li
Stretchable transparent conductive films (STCFs) show great potential for application in flexible electronics. Herein, a facile and scalable method to prepare STCFs based on Ag nanowires (AgNWs) for flexible circuits and tension sensors is introduced for the first time. AgNWs were embedded in a substrate, and its bonding property with the substrate was tested using 3M Scotch tape. The transmittance of STCFs with a sheet resistance of 20 Ω/sq was found to be more than 85% at a wavelength of 550 nm. The STCFs with less than 20 Ω/sq almost stayed constant even after twisting and bending for 10,000 cycles and stretching for 1000 cycles, respectively. Then, the current signal variation was studied using an electrochemical workstation with STCFs stretched periodically. Finally, we fabricated transparent flexible circuits for light-emitting diodes (LEDs) and tension sensors for knuckles to detect their real-time motion. The LEDs worked well in the circuits, and the sensor quickly responded to knuckle bending, which demonstrated that STCFs would have good prospects in flexible electronics.
Low-temperature co-fired ceramic (LTCC) devices have been widely used in the defense, automotive, medical, and aerospace industries. However, the traditional manufacturing process of LTCC devices is hardly suitable for cost-effective, fast design and customization requirements. In this work, we propose a multi-material integrated 3D printing technology for LTCC. LTCC slurry was configured using homemade borosilicate glass powder and Al 2 O 3 powder, and the influence of printing parameters on the printed effect was investigated. The shrinkage of the ceramics sintered at 850 °C for 15 min was 14.82 ± 0.47 % in the XY direction and 13.7 ± 0.26 % in the Z direction, comparable to that of commercial LTCC. Wireless sensing multilayer LED circuit and passive humidity sensor were fabricated, where the sensor with a sensitivity of 0.132 MHz/%RH. These cases demonstrate that the proposed technology can rapidly produce LTCC devices and meet the demand for custom LTCC devices in high-end manufacturing.
Qiaoyun Qi,Yanru Li,Wu Qiu,Wenhai Zhang,Chenyang Shi,Chen Hou,Wen Yan,Jiani Huang,Likun Yang,Hao Wang,Wenxi Guo,Xiang Yang Liu,Naibo Lin
Transient devices have attracted extensive interest because they allow changes in physical form and device function under the control of external stimuli or related commands and have very broad application prospects for information security, biomedical care and the environment. Transient bioelectrical devices were fabricated inspired by a silkworm moth breaking out of its cocoon, which has shown many advantages, including the use of mild stimulation, biocompatible materials, a simple process, and a universal strategy. For the fabrication of the transient devices, heat-sensitive microspheres with a 9.3 mol L−1 LiBr solution in wax shells were prepared by microfluidic technology, which were then assembled into silk fibroin (SF) electronic materials/devices, such as SF conductive film, an LED circuit on SF film, and a Ag/SF film/Pt/SF film memristor. The contribution from the LiBr/wax microspheres to the transient time of the SF films upon exposure to heat was quantitatively investigated. This approach was applied to transiently dissolve a flexible Ag-nanowire resistance circuit line on a SF substrate. Moreover, memristors constructed with a functional layer of SF were destroyed by melting the LiBr/wax microspheres. This technique paves the way for realizing transient bioelectrical devices inspired by biological behavior, which have been well optimized by nature via evolution.
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