Fig. 4: Extension of COF films.

a Chemical structure, and d XRD spectrum of Tp-Azo film (insert is the digital image of Tp-Azo film). b Chemical structure, and e XRD spectrum of Tp-Bpy film (insert is the digital image of Tp-Bpy film). c Chemical structure, and f XRD spectrum of Tp-PPDA film (insert is the digital image of Tp-PPDA film). g Chemical structure, and j XRD spectrum of TPB-DMTP film (insert is the digital image of TPB-DMTP film). h Chemical structure, and (k) XRD spectrum of TPB-TFB film (insert is the digital image of TPB-TFB film). i Chemical structure, and l XRD spectrum of TPB-PDA film (insert is the digital image of TPB-PDA film).