Try to start with the lowest excitation laser power. At the next experiment you could increase power. You should measure range from at least 600-3500 cm-1

Thanks for your answer, I tried it but no sign of graphite or graphene.

Dear Amin,

It's a bit strange. RS is quite capable of giving GO or reduced Graphene spectra. Please find some examples attached that were acquired on this machine.

Anyway:

(1) Use 10-20 mW of laser power

(2) Use videocamera auto-Focus option (+/- 0.1 mm ) after raw joystick focussing.

(3) Try Monitor regime first at 10-20 s exposure time

(4) If see some signal, increase exposure time (say to 40-60 s)

(5) If the signal is still noisy, indicate 4-9 accumulated scans in Configure window

(6) If still not satisfied with the signal, use 3 min accumulation Time

(instead of indicating exposure times and number of scans) The RS400

will find a best exposure time automatically. As soon as see satisfactory signal,

press Halt button. There is no need to accumulate several scans.

Good luck!

This is a major problem with my samples too and I am not getting any bands other than the one at 2829 cm-1.

Please suggest something.

Alexander Shchegolikhin Alexander S Krylov

Shraddha Shukla

First, as mentioned above, start from a low excitation power.

Second, try to adjust the focal point very precisely. However, fine adjustment of the focus usually depends on the system you are using, but it gives quite positive results