Liquid metal-integrated ultra-elastic conductive microfibers

from microfluidics for wearable electronics

Yunru Yu a,b,c, Jiahui Guo c, Biao Ma c, Dagan Zhang c, Yuanjin Zhao a,b,c,*

a Department of Rheumatology and Immunology, The Affiliated Drum Tower

Hospital of Nanjing University Medical School, Nanjing 210008, China

b Department of Clinical Laboratory, Nanjing Drum Tower Hospital, Clinical College

of Xuzhou Medical University, Nanjing 210008, China.

c State Key Laboratory of Bioelectronics, School of Biological Science and Medical

Engineering, Southeast University, Nanjing 210096, China

*Corresponding author: E-mail: yjzhao@seu.edu.cn

Supporting Figures

Figure S1. Digital image of the generation device.

Figure S2. Energy Dispersive Spectrometer results of the LM core. (a)

Energy dispersive spectrum of the liquid metal and its atomic concentrations. (b)

Weight concentrations of the LM elements.

Figure S3. Resistances of the LM microfiber according to different

temperatures.

Figure S4. Stress-strain curves of the hollow microfiber and the LM-

integrated microfiber.

Figure S5. Cycled resistance changes of the LM microfiber under

reciprocating stretching processes at different strains.

Figure S6. Relationship between diameter of the microfiber and that of the

outlet of the microfluidic device.

Figure S7. Relationships between shell thicknesses of the microfiber and

flow rates. (a) Different shell thicknesses under different outer flow rates and

microfluidic devices with different diameters of the outlet. (b) Different shell

thicknesses under different inner flow rates and microfluidic devices with different

diameters of the outlet.

Figure S8. Relative resistance change of the flexible film containing LM

fiber under cyclic tensile loading and unloading 50% strain.

Figure S9. Detailed images of the flexible film for wrist pulse sensing. (a) An

overview of the bandage covering the pulse sensor. (b) Inner side of the bandage

suggesting the encapsulation of LM microfiber.

Figure S10. Flexible films as motion indicators. (a) Digital images of the film

attached on the wrist during the bending process. (b) Digital images of the film

attached on the thumb during the bending process. (c) Relative resistance change of

the film during bending of the wrist. (d) Relative resistance change of the film during

bending of the thumb.

Figure S11. Overview and detailed digital images of the electro-magnet.

Figure S12. Digital image of the film used for electro-thermal conversion

application.

Figure S13. Relationships between the temperature of the film with input

current and input time.

Figure S14. The structural color of the film recovering from blue to red without

an input current.

Supporting Movies

Movie S1. Generation process of the LM-integrated microfiber.

Movie S2. Electro-magnetic conversions.

Movie S3. Color change induced by electro-thermal conversion.