Journal: Nature Communications

Article Title: Langmuir-Schaefer deposition of 2D PbS quantum dot superlattices with millimetre square coverage

doi: 10.1038/s41467-025-64065-y

Figure Lengend Snippet: Schematic of 2D superlattice fabrication in the Langmuir-Schaefer trough: ( a ), the colloidal solution of PbS QD is drop-casted at the centre of the bath on the EG surface; ( b ), after solvent evaporation, the compression is started and the film is compacted until the desired starting surface pressure is reached; ( c ), the ligand exchange solution is injected in the trough from both sides underneath the barriers while compression is continued; ( d ), once the desired final surface pressure is reached, the SLs are transferred to the substrate of choice with the Langmuir-Schaefer method. e Exemplary surface pressure isotherms as a function of the area available per single QD. The dashed arrows indicate the points of solution injection and film pick-up on the ligand exchange curve. The coloured regions indicate the approximate timespan of ligand exchange injection. f STEM-HAADF micrograph of the OA sample fabricated at high surface pressure. The FFT is relative to the area indicated by the white square (scale bars: 200 nm, 0.5 nm −1 ).

Article Snippet: A Langmuir trough (Biolin KSV NIMA KN-2001 with Teflon barriers KN-0041) was installed inside a glovebox.

Techniques: Solvent, Evaporation, Injection