Highly ordered silicon nanorod(Si NR)arrays with controllable geometry are fabricated via nanosphere lithography and metal-assisted chemical etching.It is demonstrated that the key to achieving a high-quality metal mask is to construct a non-close-packed template that can be removed with negligible damage to the mask.Hydrophobicity of Si NR arrays of different geometries is also studied.It is shown that the nanorod structures are effectively quasi-hydrophobic with a contact angle as high as 142°,which would be useful in self-cleaning nanorod-based device applications.
BACKGROUND: The oncogenesis of hepatocellular carcinoma(HCC) is not clear. The current methods of the pertinent studies are not precise and sensitive. The present study was to use liver cancer cell line to explore the bio-compatibility and cytotoxicity of ternary quantum dots(QDs) probe and to evaluate the possible application of QDs in HCC.METHODS: CuInS_2-ZnS-AFP fluorescence probe was designed and synthesized to label the liver cancer cell HepG 2. The cytotoxicity of CuInS_2-ZnS-AFP probe was evaluated by MTT experiments and flow cytometry. RESULTS: The labeling experiments indicated that CuInS_2-ZnS QDs conjugated with AFP antibody could enter HepG 2 cells effectively and emit intensive yellow fluorescence by ultraviolet excitation without changing cellular morphology. Toxicity tests suggested that the cytotoxicity of CuInS_2-ZnS-AFP probe was significantly lower than that of CdT e-ZnS-AFP probe(t test, F=0.8, T=-69.326, P<0.001). For CuInS_2-ZnS-AFP probe, timeeffect relationship was presented in intermediate concentration(>20%) groups(P<0.05) and dose-effect relationship was presented in almost all of the groups(P<0.05). CONCLUSION: CuInS_2-ZnS-AFP QDs probe had better biocompatibility and lower cytotoxicity compared with CdT e-ZnS-AFP probe, and could be used for imaging the living cells in vitro.
We numerically investigate the transmission properties of a subwavelength composite hole-pillar array. As the radius of the pillar increases, the transmission properties experience a complex evolution. It is found that the magnetic dipole resonance of the pillar suppresses the surface plasmon polariton resonance(SPPR) at the gold-air interface. There are two strong transmission peaks associated with the magnetic dipole resonance of pillar and SPPR at the gold-silica interface. A peak associated with magnetic quadrupole resonance of the pillar is observed. Moreover, there is a weak peak associated with the coupling between the whispering-gallery plasmon(WGP) mode and magnetic dipole. Our work is helpful for making a dual band optical filter.
