Fig. 5From: Colorimetric Humidity Sensors Based on Electrospun Polyamide/CoCl2 Nanofibrous MembranesSEM images of a pure PA66 NFM, b PA66/CoCl2·6H2O (10 wt%) NFM, c PA66/CoCl2·6H2O (30 wt%) NFM, and d PA66/CoCl2·6H2O (50 wt%) NFMBack to article page