Stretchable circuits based on liquid metals are promising for wearables but the lack of scalable processes for sintering of printed liquid metal dispersions constitutes a challenge for large-area and high-volume manuf...Stretchable circuits based on liquid metals are promising for wearables but the lack of scalable processes for sintering of printed liquid metal dispersions constitutes a challenge for large-area and high-volume manufacturing.In this work,materials and methods for fully screen printed stretchable liquid metal multilayer circuits have been developed.The ink is based on liquid metal droplets dispersed in the green solvent propylene glycol using the harmless dispersion agent polyvinylpyrrolidone.The development of a scalable water-spray sintering method in combination with ink optimization yielded highly conductive prints of≈7.3×10^(5)S/m.Interestingly,the printed conductors experienced a resistance increase of less than 10%during 50%strain cycling,which is far below the expected 125%increase due to the geometry factor.The process allows for printing of highperformance multilayer circuits,which is demonstrated by the development of printed stretchable near-field communication tags.展开更多
The implementation and characteristics of a compact lumped-element three-order low pass filter are presented in this paper. The filter with 120 MHz cut off frequency, as well as more than 20 dB of the attenuation abov...The implementation and characteristics of a compact lumped-element three-order low pass filter are presented in this paper. The filter with 120 MHz cut off frequency, as well as more than 20 dB of the attenuation above 360 MHz frequency band is successfully manufactured in an LTCC substrate with 40 pm layer thickness. The overall size of the filter is 2.0 mm×1.2 mm×0.9 mm. A good coincidence between the measured results and the full-wave electromagnetic designed responses is observed.展开更多
Application of liquid metals and electrospun nanofibers offer a promising solution to insufficient resilience and human com-fort of wearable electronics.However,a sustainable manufacturing process is hindered by the l...Application of liquid metals and electrospun nanofibers offer a promising solution to insufficient resilience and human com-fort of wearable electronics.However,a sustainable manufacturing process is hindered by the low surface tension of liquid metal,and it's poor attachment to the surface of the fabric.This research reveals that tuning the pressure can control the adhesion of semiliquid metal(SLM)on substrates with varying roughness to achieve selective adhesion.Furthermore,a simple and rapid(30 s)fabrication method based on selective adhesion and low mobility of SLM is presented for preparing a multilayered monitoring device capable of measuring human body temperature and ECG signals for 24 h.This device exhibits excellent air permeability of 311.1 g·m^(-2)·h^(-1),water resistance(washing for 120 min).Our novel approach can inspire the development of methods for printing liquid metal circuits on roughness substrates and enable the practical use of waterproof and breathable wearable electronic devices in the future.展开更多
基金supported by the Swedish Foundation for Strategic Research,the Swedish Research Council(2023-04694)the Knut and Alice Wallenberg Foundation(Wallenberg Academy Fellow)the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University(Faculty Grant SFO Mat LiU No 200900971).
文摘Stretchable circuits based on liquid metals are promising for wearables but the lack of scalable processes for sintering of printed liquid metal dispersions constitutes a challenge for large-area and high-volume manufacturing.In this work,materials and methods for fully screen printed stretchable liquid metal multilayer circuits have been developed.The ink is based on liquid metal droplets dispersed in the green solvent propylene glycol using the harmless dispersion agent polyvinylpyrrolidone.The development of a scalable water-spray sintering method in combination with ink optimization yielded highly conductive prints of≈7.3×10^(5)S/m.Interestingly,the printed conductors experienced a resistance increase of less than 10%during 50%strain cycling,which is far below the expected 125%increase due to the geometry factor.The process allows for printing of highperformance multilayer circuits,which is demonstrated by the development of printed stretchable near-field communication tags.
基金This work was supported by the National Nature Science Foundation of China under Grant No. 60425102.
文摘The implementation and characteristics of a compact lumped-element three-order low pass filter are presented in this paper. The filter with 120 MHz cut off frequency, as well as more than 20 dB of the attenuation above 360 MHz frequency band is successfully manufactured in an LTCC substrate with 40 pm layer thickness. The overall size of the filter is 2.0 mm×1.2 mm×0.9 mm. A good coincidence between the measured results and the full-wave electromagnetic designed responses is observed.
基金supported by the Key Research and Development Program of Zhejiang Province under Grant nos.2021C05005 and 2021C05007-2the National Natural Science Foundation of China under Grant no.52121002.
文摘Application of liquid metals and electrospun nanofibers offer a promising solution to insufficient resilience and human com-fort of wearable electronics.However,a sustainable manufacturing process is hindered by the low surface tension of liquid metal,and it's poor attachment to the surface of the fabric.This research reveals that tuning the pressure can control the adhesion of semiliquid metal(SLM)on substrates with varying roughness to achieve selective adhesion.Furthermore,a simple and rapid(30 s)fabrication method based on selective adhesion and low mobility of SLM is presented for preparing a multilayered monitoring device capable of measuring human body temperature and ECG signals for 24 h.This device exhibits excellent air permeability of 311.1 g·m^(-2)·h^(-1),water resistance(washing for 120 min).Our novel approach can inspire the development of methods for printing liquid metal circuits on roughness substrates and enable the practical use of waterproof and breathable wearable electronic devices in the future.
