Fig. 5: Consecutive TERS imaging of the plasmon-induced 2D polymerization within monomer 1 ML on Au(111). | Nature Communications

Fig. 5: Consecutive TERS imaging of the plasmon-induced 2D polymerization within monomer 1 ML on Au(111).

From: In-situ nanospectroscopic imaging of plasmon-induced two-dimensional [4+4]-cycloaddition polymerization on Au(111)

Fig. 5: Consecutive TERS imaging of the plasmon-induced 2D polymerization within monomer 1 ML on Au(111).

a The 1st, b 2nd, and c 3rd TERS intensity images of the band at 965 cm−1. The maps were repeatedly measured over a 100 × 100 nm2 area with 3.125 × 3.125 nm2 pixels resolution at the same location under continuous laser irradiation (633 nm, 0.3 mW, 10 s integration). d–f Corresponding growth kinetics of the plasmon-induced [4+4]-cycloaddition polymerization in monomer 1 on Au(111). In order to connect the TERS maps with the chemistry of the monomer array, an artificial hexagonal network was created considering relevant sizes of the monomer packing obtained from the model in Fig. 4. This network contains 55 × 55 hexagonal units. Lattice sites specified with blue areas represent the unreacted monomers and the yellow (1st imaging), pink (2nd imaging), and green (3rd imaging) areas exhibit polymerized parts based on the signal/noise criterion S/N > 4 of the band at 965 cm−1. g Baseline corrected average TER spectra of monomer 1 (blue curve, averaged from 1024 spectra in a) and corresponding plasmon-induced 2DP 1 (red curve, averaged from 100 spectra in the black frame in c). h 10 sequential TERS measurements along the line trace and retrace scans marked in a. i Corresponding TERS intensity and Gaussian fitting of the band at 965 cm−1 in h. The spatial resolution is estimated using a full-width at half maximum (FWHM) analysis. a.u. arbitrary units.

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