A biodegradable polymer-assisted efficient and universal exfoliation route to a stable few layer dispersion of transition metal dichalcogenides

Large‐Scale Solution‐Processed Ultrathin 2D Tri‐layer Heterostructures for Photodetector Applications

“…In a typical procedure, 20 mg of bulk MoS 2 , MoSe 2 , TiS 2 powder were added into a 50 mL glass vial containing 20 mL of 1‐Butanol and 20 mg of HPC. The solution was sonicated for 4 h by using a bath sonicator [30] . The dispersions were allowed to settle for 24 h, and then the top layer of the dispersion was collected.…”

“…The overall photodetector fabrication process via solution processable route is schematically shown in Figure 1. In brief, individually dispersed 2D MoS 2 , MoSe 2 and TiS 2 nanosheets were firstly exfoliated from the bulk materials using a previously reported liquid phase exfoliation method [30] . To fabricate thin films, 2 ml of each solution was subsequently filtered under vacuum onto a AAO Whatmann filter paper one after the another with a 30 mins interval and dried in a vacuum oven overnight.…”

“…The solution was sonicated for 4 h by using a bath sonicator. [30] The dispersions were allowed to settle for 24 h, and then the top layer of the dispersion was collected. To fabricate the hybrid photodetector, 2 ml of supernatant solution of each TMDs was collected in different vials, and then filtered under vacuum on a AAO Whatmann filter paper one after the another with a gap of 30 mins to fabricate the TiS 2 /MoSe 2 / MoS 2 heterojunction.…”

“…In Figure 4, the Raman spectral bands at ~382 cm À 1 (strong, E 1 2g mode) and ~404 cm À 1 (strong, A 1g mode) representing in-plane E 1 2g , out of plane A 1g vibrations respectively of 2D-MoS 2 whereas, peak near ~235 cm À 1 representing the A 1g (out-of-plane) mode corresponding to 2D-MoSe 2 were observed. [30] Due to low penetration depth of source, TiS 2 peaks were not observed in case of Raman mapping.…”