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(a) SEM images and (b) TEM images of Cu3(HHTP)2-Fs. (c) Size-dependent NO2 sensing characteristics of the Cu3(HHTP)2-ω (ω = 10000–0) sensor. The error bars were calculated from the responses of 3 different sensors. (d) Normalized sensing transients of Cu3(HHTP)2-NFs sensor to NO2 under different illumination conditions (dark, red, green, and blue). (e) UV/vis spectra and (f) Tauc plot of Cu3(HHTP)2-NFs.
