Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 49, Pages 45844-45852Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14431
Keywords
biodegradable electronics; biodegradable conductor; transient electronics; flexible electronics; selective laser sintering
Funding
- National Key Research and Development Program of China [2018YFB1105400]
- National Natural Science Foundation of China [61704074]
- Key Research and Development Program of Jiangsu Provincial Department of Science and Technology of China [BE2019002]
- Fundamental Research Funds for the Central Universities
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Biodegradable electronic devices are able to break down into benign residues after their service life, which may effectively alleviate the environmental impacts as a consequence of the proliferation of consumer electronic technology. The widespread adaptation to biodegradable systems is currently impeded by the lack of economic fabrication techniques for functional devices. Here, a facile approach to generate a biodegradable conductor is developed based on selective laser sintering of zinc and iron microparticle ink. The sintering process is effective to convert naturally oxidized microparticles into interconnected conductors. Arbitrary conductive features are readily created over flexible biodegradable substrates under ambient conditions, which exhibits excellent conductivity (similar to 2 x 10(6) S m(-1)), low sheet resistance (similar to 0.64 Omega square(-1)), fine feature resolution (similar to 45 mu m), and mechanical flexibility. The practical suitability is demonstrated by fabricating a miniaturized near-field communication tag with the dimension to mount on the fingernail. The methodology is further extended to create a metallic grid as a biodegradable transparent electrode with low sheet resistance (2.5 Omega square(-1)) and high optical transmittance (96%), which is employed as an epidermal transparent heater for thermotherapy. Maskless patterning of biodegradable conductors may find a broad range of applications in environment friendly gadgets and implantable medical devices.
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