With the rapid advancement of flexible wearable technology, bio-compatible textile piezoelectric pressure sensors are a promising candidates for next-generation sensing platforms to monitor human health. Smart textiles can be easily incorporated into our daily wear clothing in a breathable and conformable manner. In this study, a novel structural hierarchy consisting of a piezoelectric composite film Glycine - Chitosan (GC) sandwiched between two Zinc Oxide (ZnO) nanorods patterned conductive textile electrodes was developed. A low temperature hydrothermal method was used to grow ZnO nanorods directly on the conductive fabric, and a simple solvent casting technique was employed to form a Glycine-Chitosan film. SEM and XRD analyses were performed to investigate the growth of the bio-compatible piezoelectric materials. Under periodic deformation, the fabricated sensor exhibited a good piezoelectric response over a wide range of sensing pressures. The use of non-toxic, bio-compatible piezoelectric materials in the development of textile pressure sensors paves the way for the development of eco-friendly wearables.

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New Schiff base metal complexes of Co(II), Ni(II), Cu(II) and Zn(II) with 3-Acetylcoumarin and 2-methylbenzyl hydrazinecarbodithioate {[Co(L)(OAc)] (1), [Ni(L)(OAc)] (2), [Cu(L)(OAc)] (3) and [Zn(L)(OAc)] (4)} were synthesized and characterized by elemental analysis, IR, UV-Vis, 1H-NMR, molar conductance, ESR and mass spectrometry. Based on these data, it is clear that the Schiff base act as tridentate for metal complexes via the ionic sulphur of thiol and azomethine nitrogen atom, as well as the oxygen atom of the carbonyl group. Electronic spectral results were used to infer the geometry of the complexes, which was then validated using DFT calculations. The molar conductance discloses that the Schiff base complexes are non-electrolytic. The in vitro antibacterial activity suggest that the metal complexes are highly active against two bacteria (Streptococcus pneumonia and Escherichia coli). Furthermore, the in vitro antioxidant activity of all the complexes was determined by DPPH radical scavenging method.