My carbon nanotube (CNT) film was fabricated using the floating catalyst CVD method. It was transferred onto a piece of quartz slide that could then be inserted in a 1-cm cuvette. The cuvette was filled with distilled water.
The UV-Vis spectrum turned out to have 2 peaks. The peak at 264 nm was expected due to pi-plasmon resonance but I did not understand the 203-nm peak. The result is attached. Can somebody help me please? Thank you.