title: Printing low-melting-point alloy ink to directly make a solidified circuit or functional device with a heating pen.
abstract: A new method to directly print out a solidified electronic circuit through low-melting-point metal ink is proposed. A functional pen with heating capability was fabricated. Several typical thermal properties of the alloy ink Bi35In48.6Sn16Zn0.4were measured and evaluated. Owing to the specifically selected melting point of the ink, which is slightly higher than room temperature, various electronic devices, graphics or circuits can be manufactured in a short period of time and then rapidly solidified by cooling in the surrounding air. The liquid-solid phase change mechanism of the written lines was experimentally characterized using a scanning electron microscope. In order to determine the matching substrate, wettability between the metal ink Bi35In48.6Sn16Zn0.4and several materials, including mica plate and silicone rubber, was investigated. The resistance-temperature curve of a printed resistor indicated its potential as a temperature control switch. Furthermore, the measured reflection coefficient of a printed double-diamond antenna accords well with the simulated result. With unique merits such as no pollution, no requirement for encapsulation and easy recycling, the present printing approach is an important supplement to current printed electronics and has enormous practical value in the future.
authors.affiliation: Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.affiliation: Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, People's Republic of China ; Department of Biomedical Engineering , School of Medicine, Tsinghua University , Beijing 100084, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
keywords: direct writing; heating pen; liquid metal; low-melting-point metal ink; printed electronics