I have prepared water soluble WS2 nanosheets and drop casted on a glass slide. I want to take Raman spectrum of WS2 powder (Bulk) and drop casted WS2 nanosheets using 532 nm excitation. what should be the approximate acquisition time and power ?
That depends on your spectrometer optics, especially the size of your laser spot. Since Raman isn't exactly a slow method, I'd say you can just try approach the power from below and the acquisition time from above. If your detector oversaturates before an acceptable S/N ratio is reached, most spectrometer software have also the option to do multiple acquisitions.
There is no universal standard for all samples or all spectrometer models. But, preferably you can measure within 1 mW laser-power (for red or green lasers) in order to avoid any oxidation or local sample-degradation.
I generally prefer to average out 10 spectral acquisitions with 6 s integration time each. This means, a total of 1 minute net integration time. This is sufficient for getting high quality publishable data, if the sample is properly focused and response is good.
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