Wearable electronics has emerged into the consumer markets over the past few years. Wrist worn and textile integrated devices are the most common apparatuses for unobtrusive monitoring in sports and wellness sectors. Disposable patches and bandages, however, represent the new era of wearable electronics. Soft and stretchable electronics is the enabling technology of this paradigm shift. It can conform to temporary transfer tattoo and deform with the skin without detachment or fracture. In this paper, we focus on screen-printed soft-electronics for remote body monitoring. We will present a fabrication process of a skin conformable electrode bandage designed for long-term outpatient electrocardiography (ECG) monitoring. The soft bandage is designed to be attached to the patient chest and miniaturized data collection device is connected to the bandage via Micro-USB connector. The fabricated bandage is tested in short exercise as well as continued long-term (72 hours) monitoring during normal daily activities. The attained quality of the measured ECG signals is fully satisfactory for rhythm-based cardiac analysis also during moderate-intensity exercise. After pre-processing, the signals could be used also for more profound morphological analysis of ECG wave shapes.
For application of device fabrication by inkjet printing, an accurate and high resolution patterning method is required.
However, high resolution inkjet printing, which limited by the inkjet nozzles and the ink movements, is one of the most
challenging issues at present. An enhanced control of ink flow and spread by surface energy patterning on substrates can
be used to improve the resolution and quality of the inkjet printed devices. Our strategy is depositing a hydrophobic pattern
on a hydrophilic substrate, and thereafter inkjet printing the functional ink on top of the surface energy pattern. High
surface energy contrast patterns on polyimide were got by microcontact printing, which can make ink moving from
hydrophobic area to hydrophilic polyimide substrate. Inkjet printed silver patterns with 15 μm thin gaps were obtained by
the surface energy pattern. This visible and easy processing pattern can be used widely in inkjet printing for higher
resolution, more precise pattern, and smaller devices.