<br/>Green electronics on biodegradable substrates from natural sources have gained broad interest due to the advantages of being biocompatible, biodegradable, recyclable, sustainable, and cost-efficient. This study presents a low-cost, yet simple extraction and purification method that explores aqueous extraction and precipitation with ethanol for the synthesis of galactomannan films. In salient contrast to the other materials of natural origin, the process to obtain galactomannan films is energy efficient and environmentally friendly. As an alternative biodegradable material, galactomannan, has direct relevance to the recent emerging biodegradable or transient electronics. The galactomannan substrate with temperature sensors and electrodes fabricated on top with zinc, a biodegradable material noted for its essential biological function, demonstrates high-precision measurement of temperature and high-fidelity monitoring of electrophysiological signals (electromyography, EMG; or electrocardiography, ECG). The resulting disposable sensors disappear without a trace in water and produce environmentally benign end products that could even be used for alkaline soil amendments. The set of materials explored in this study are also stable in organic solutions, enabling solvent-based fabrication that may be combined with recent advances in additive manufacturing techniques for a novel manufacturing method.

Fully water-soluble and biodegradable high-performance transient sensors on a low-cost, ultrathin galactomannan substrate

256th National Meeting (2018)

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