I have bought CNTs from a supplier who gave us CNTs in alcohol. I want to do the Raman analysis of these CNTs. Can someone please suggest me the sample preparation steps? I tried to spread these black sheets on SiO2 substrates. I dried them by using compressed dry air. They stick to the substrate very well. Is that all I need to do? Or do I need to do any processing with these tubes to separate them from these long sheets before Raman or any other analysis?
Common method to perform Raman spectrum analysis of Cnt. Carbon Nanotube coated on glass slides can be submitted for analysis. The way of preparing the cnt is OK. They were imaged using the 20x
objective under the microscope and the Raman collected using the Ventuno Raman system. Several areas of each sample were evaluated. The instrument was equipped with a
532 nm diode laser; 2 gratings and an air cooled CCD detector. The integration times for spectral collection were 20 seconds per acquisition. The confocal aperture used (50mm), gives an approximate 1mm (x,y) and 2mm (z) sample volume.The laser power at the sample was 10 mW or less.The primary concern in the analysis of the nanotubes was burning of the samples under prolonged laser exposure. The switching of the wavelengths was one method used to help reduce this effect. Additionally a laser attenuator was added to reduce the power on the sample and allow for longer collection times. Many of the
nanotube samples were thin layers on microscope slides did not exhibit signs of burning. The more impure nanotube samples seemed to suffer the most from absorption of the laser.
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