Figure 7
From: Emerging flexible and wearable physical sensing platforms for healthcare and biomedical applications
Flexible and stretchable physical sensing platforms for physiological monitoring and assessment. (a) Soft piezoelectric compliant modulus sensor (CMS) constructed from the flexible networks of mechanical sensors and actuators based on lead zirconate titanate nanoribbons. (i) Schematic illustration showing the exploded view of the device architecture: the top view of the device is shown in the lower-left inset, whereas the cross-sectional view of the device is depicted in the black-dashed region. (ii) Optical image showing the actual fabricated device on a thin silicone substrate. Scale bar 1 cm. Insets show the gold interconnection region (upper right, scale bar, 5 mm) and the arrays of sensors and actuators (lower-right, scale bar 1 mm) with the corresponding electrical circuit diagram (upper left). (iii) Optical images of a device conformed onto a cylindrical glass (left) and a device laminated partially (center) and fully (right) on the skin. Scale bars 1 cm. (iv) SEM image showing a CMS unit consisting of an array of six sensors and seven actuators on an artificial skin (scale bar 0.5 mm) with the corresponding magnified image of the red-dashed region depicting a sensor (left) and actuator (right) pair (scale bar, 100 μm). (b) Spatiodirectional mapping capability of the rotatable CMS unit and in vivo ‘on patient’ assessment. (i) Schematic illustration showing the exploded view of the rotatable CMS unit. (ii) Diagram illustrating the spatiodirectional mapping principle of the device, where R defines the protractor radius, and w defines the distance between the protractor center and the first sensor edge in the array that describes the mapping region. (iii) Optical image showing the forearm in the absence (top) and presence (bottom) of the mounted device. (iv) Mapping data corresponding to the assessment in (iii). (v) Optical image showing the lower leg in the absence (top) and presence (bottom) of the mounted device. (vi) Mapping data corresponding to the assessment in (v). Adapted with permission from Ref. 47. Copyright 2015 Macmillan Publishers Limited.
