![]() Such EES have physical properties that approximate those of the epidermis, integrating both passive sensing functions 18, 19 and active modalities 20 for daily healthcare monitoring with maximum comfort and high sensing precision. Recent work 14– 17 has established various ultrathin, soft electronic technologies, sometimes referred to as epidermal electronic systems (EES). Such circumstances motivate the development of wearable devices that offer improved compatibility with the skin at the level of the materials, the geometries, the mass density, the mechanical properties and the air/water permeability 12, 13. Additional negative consequences include inconsistent, unreliable coupling to the skin, discomfort associated with contact pressure and interfacial shear and frictional forces, and constraints on locations for body integration, thereby adversely affecting the user experience and sensor accuracy. The result is a mechanical and geometrical mismatch with the soft and curvilinear textures of the body, thereby necessitating the use of fixtures (wrist bands, head bands, chest straps or glasses) 11 or strong adhesives for mounting. A significant challenge in the creation of comfortable, non-irritating interfaces with the body originates from the current use of rigid or semi-rigid substrates and packages directly adopted from those found in non-wearable consumer electronics 1. Future advances in this rapidly evolving area will improve processes for delivering health care 9 and for reshaping personal lifestyles to enhance well-being 10. ![]() Recent research and development in wearable technologies has yielded a broad range of devices with applications in daily health monitoring 1, activity tracking 2, 3, data logging 4, human–machine interfaces 5, 6 and clinical diagnostics 7, 8. The results suggest robust capabilities for battery-free RF power, with relevance to many emerging epidermal technologies. Systematic studies of the individual components and the overall performance in various dielectric environments highlight the key operational features of these systems and strategies for their optimization. These components, separately fabricated and tested, can be integrated together via methods involving soft contact lamination. Here we introduce an epidermal, far-field radio frequency (RF) power harvester built using a modularized collection of ultrathin antennas, rectifiers and voltage doublers. A primary challenge is power supply the physical bulk, large mass and high mechanical modulus associated with conventional battery technologies can hinder efforts to achieve epidermal characteristics, and near-field power transfer schemes offer only a limited operating distance. Epidermal electronic systems feature physical properties that approximate those of the skin, to enable intimate, long-lived skin interfaces for physiological measurements, human–machine interfaces and other applications that cannot be addressed by wearable hardware that is commercially available today.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |