Fig. 5

(i) Schematic illustration of the sacrificial templates assisted electrospinning fabrication process for hierarchically porous WO₃ NFs functionalized by Apo-Pt NPs, SEM images of (b-i) as-spun W precursor/PVP composite NFs, (c) dense WO₃ NFs after calcination, and (d) magnified image of (c), SEM images of (e) as-spun W precursor/PVP composite NFs embedded with MWCNTs, (f) MP_WO₃ NFs after calcination, and (g) magnified image of (f). SEM images of (h) as-spun W precursor/PVP composite NFs embedded with MWCNTs, PS colloids and Apo-Pt NPs, (i) Apo-Pt@HP_WO₃ NFs after calcination, and (j) magnified image of (i). (ii) Pattern recognition based on principal component analysis (PCA) using sensor arrays (Apo-Pt@HP_WO₃ NFs, HP_WO₃ NFs and MP_WO₃ NFs) for (a) selectivity and (b) diagnosis of simulated acetone breath. Reprinted from [97] with permission from Elsevier