Abstract
This chapter presents an overview on typical electrical properties of liquid metal in making soft or flexible printed biomedical electronics. The core manufacturing material—the room temperature liquid metal was particularly focused for illustration purpose. Meanwhile, a series of recently developed manufacturing technologies spanning from personal electronic circuit printing to 3D room temperature liquid metal printing were comprehensively introduced. Applications of these planar or three-dimensional printing technologies and the related liquid metal alloy inks in making flexible electronics were briefly discussed. The significantly different adhesions of liquid metal inks on various substrates under different oxidation degrees, un-firmness of circuits, difficulty of fabricating high-accuracy device and low rate of good product which challenge current liquid metal flexible printed electronics were interpreted. Prospects of liquid metal electronics to develop ending user biomedical devices and more extensive applications in the coming daily life were given.
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