Fig. 3: Thickness-dependent lattice contraction.

a The HRTEM image of sample 1 (Table 2) with a ~30% O atom concentration. The upper right inset is a zoom-in view and the lower inset is a fast Fourier transform pattern. The HRTEM images of sample 11 (b) and sample 20 (c) are displayed for comparison. d Lattice contraction rates as a function of nanoribbon thickness measured from HRTEM at 300 K. The dot-and-dash line represents the situation of no lattice contraction from bulk TiS3, where lattice constant a is 0.4958 nm and b is 0.3401 nm. The error bars of lattice contraction rates are from the variations among several individual measurements (see Supplementary Note 6).