Polyethylene glycol (PEG) assembled on the surface of two-dimensional tungsten disulfide (WS) into a limited number of nanoislands (NIs), nanoshells (NSs), and granular nanoparticulates (GNPs) depending on its chain length. NI assemblies showed a nonmeasurable shift of photoluminescence (PL) and the A and B absorption peaks of WS. This confirmed that the electronic doping by thiol is not effective. The PEG NS assembly displayed a smaller red shift of the PL and a slight decrease of the energy difference between the A and B absorption peaks of WS. However, increasing the dielectric function on the surface of WS has a small influence on their optical properties. The PEG NP assembly on WS exhibited a significant red shift of the PL spectrum and a large decrease of the energy difference between A and B absorption peaks. Deforming the WS sheet by the PEG NP assembly decreased the orbital coupling and lowered the electronic direct band gap significantly. Raman bands of WS are shifted to a higher frequency on improving its mechanical strength after the PEG assembly.
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