11 February 2019 3 9K Report

Dear Reader,

We have prepared a sample of MoS2 nanosheets using liquid phase exfoliation with DMF (Dimethylformamide) as solvent. 50ml was prepared with a concentration of 5mg/ml. After probe sonication for 3hrs, the sample was centrifuged at 3000rpm for 30 minutes. The supernatant was collected and labelled as DMF 1. The sediment was then re-suspended in fresh DMF and the sample so obtained was labelled as DMF 2.

According to the published paper, for UV-VIS spectrometry measurement two peaks at 612nm and 674nm should be observed which is not in the case of DMF 1.

Instead, two peaks are visible at 628 nm and 689 nm for case of DMF 2.

Which one is the correct method ? Plz help.

Thanks in advance.

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