Figure 4.

(a) Electroless Cu plated samples: the whole surface, pattern, and corresponding optical microscopy image; (b) SEM images of electroless Cu plated sample: longitudinal view and cross-sectional; (c) illustration of electroless plating process (reprinted with permission from Ref. [69] Copyright 2021, American Chemical Society); (d) sheet resistance during periodic stretching and releasing test at different strain levels, using a wearable strain sensor prepared by silver plated cotton/spandex blended fabric (reprinted with permission from Ref. [23] Copyright 2021, Elsevier); (e) the scheme of an EMI shielding mechanism of Ni-W-P/PANI/PI fabric (reprinted with permission from Ref. [61] Copyright 2021, Elsevier).