Abstract
Two or three types of semiconductor nanoparticles (NPs) have been deposited on the sidewalls of multi-wall carbon nanotubes (MWCNTs) by a solvothermal treatment of a mixture containing poly(sodium 4-styrenesulfonate) (PSS) wrapped MWCNTs, metal chloride (CuCl2 and SnCl2), and thiourea. Changing the ratio of Cu2+ to Sn2+ alters the composition of the resultant MWCNT–PSS–NP hybrids. Under Cu/Sn ratios of 3:1 and 2:1, MWCNTs can be simultaneously decorated with Cu2S and Cu3SnS4 NPs. When the ratio is reduced to 1:1, Cu3SnS4, Cu2S and SnO2 NPs would be formed at the same time. Further decreasing the ratio results in the formation of Cu2SnS3 and SnO2 instead of Cu3SnS4 and Cu2S. Open-aperture z-scan measurements have been carried out on three typical MWCNT–PSS–NP samples to study their optical limiting (OL) properties. The addition of semiconductor NPs can improve the OL performance of MWCNTs, and the composition of the NPs has a significant effect on the OL behavior of the hybrids.
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