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TEM images of the cross-linking monolayer prepared by the exchange reaction with different dithiol molecules: (A) 1,2-ethanedithiol; (B) 1,3-dimercaptopropane; (C) 1,4-butanedithiol; (D) 1,5-pentanedithiol; (E) 1,6-hexanedithiol; (F) UV–Vis absorption spectrum of the cross-linking monolayer with different dithiol molecules, inset is the plot of λmax vs dithiol carbon numbers.
