Third-order nonlinear optical properties of multiwalled carbon nanotubes modified by CdS nanoparticles |
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Authors: | Haijun Zeng Junhe Han Dongjin Qian Yuzong Gu |
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Institution: | 1. Institute of Microsystem Physics, School of Physics and Electronics, Henan University, Kaifeng 475004, PR China;2. Department of Chemistry, Fudan University, Shanghai 200433, PR China |
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Abstract: | CdS nanoparticles were coated on the side wall of multiwalled carbon nanotubes (MWCNTs) by a wet chemical synthesis approach via noncovalent functionalization of MWCNTs with poly(diallyldimethylammonium chloride) (PDDA). The as-prepared material was characterized by X-ray diffraction (XRD), UV–vis absorption, fluorescence and transmission electron microscopy (TEM). The results indicated that CdS nanoparticles were uniformly coated on the surface of MWCNTs. Third-order optical nonlinearity of the as-prepared material was studied with the Z-scan technique with picosecond laser pulses at 532 nm. The Z-scan curve revealed that CdS nanoparticle-modified MWCNTs exhibited negative nonlinear refraction index and positive absorption coefficient. The real part and imaginary part of the third-order nonlinear susceptibility χ(3) were calculated to be −4.9 × 10−12 and 6.8 × 10−13 esu, respectively. |
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Keywords: | Third-order optical nonlinearity Z-scan CdS nanocrystals MWCNTs |
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