We present our results from the measurements of third-order optical nonlinearity in DNA doped Rhodamine 6G/PVA films achieved through Z-scan measurements using ~2 picosecond (ps) pulses at a wavelength of 800 nm. The ...We present our results from the measurements of third-order optical nonlinearity in DNA doped Rhodamine 6G/PVA films achieved through Z-scan measurements using ~2 picosecond (ps) pulses at a wavelength of 800 nm. The films demonstrated negative nonlinear refractive index (n2) with magnitudes of (0.065 - 2.89) × 10–14 cm2/W with varying concentration of DNA. Open aperture data demonstrated strong two-photon absorption with a magnitude of ~1.6 cm/GW for films doped with 2 wt% of DNA. The recovery time of excited state population, retrieved from the degenerate pump-probe experimental data, was <4 ps. These data suggests that DNA is promising material for applications such as optical switching.展开更多
The mixture of Nano-graphite and organic vehicles doped to Nano-diamond paste. The suitable paste proportion was found. Nano-diamond film (NDF) was prepared by sol-gel coating method on ITO glass at 3000/min. The fiel...The mixture of Nano-graphite and organic vehicles doped to Nano-diamond paste. The suitable paste proportion was found. Nano-diamond film (NDF) was prepared by sol-gel coating method on ITO glass at 3000/min. The field emission characteristics of luminance-current, luminance-voltage and luminance-power of Nano-diamond film were analyzed and tested. Comparing these tested curves, the luminance was well proportional to current was got. Theoretic, the inner resistance of NDF field emission display (FED) consumes electric energy and real voltage change between the cathode and the anode of NDF-FED was very small after electrons emit. So the characteristic of NDF-FED was preferable to describe by luminance-current linear relationship, which was advantageous to device tested and designed.展开更多
Titania thin films with hierarchically macro-mesoporous were prepared by the addition of bulky organic molecule(1,3,5-trimethylbezenze) in aqueous solution of F127(EO106PO70EO106). After calcined at 673 K,ordered thin...Titania thin films with hierarchically macro-mesoporous were prepared by the addition of bulky organic molecule(1,3,5-trimethylbezenze) in aqueous solution of F127(EO106PO70EO106). After calcined at 673 K,ordered thin films with cubic meso-structure and macropores were formed. DNA(Cytochrome c) was used as probe to study the adsorption ability of macromolecules on this film. The hierarchically macro-mesoporous films show high adsorption ability of DNA molecules compared with conventional titania films and mesoporous titania films,which is attributed to the presence of macropores.展开更多
A NOS gene electrochemical biosensor was prepared by covalently immobilizing of NOS ssDNA sequence on the mercaptoacetic acid monolayer self-assembled gold electrode with the help of N-（3-dimethylaminopropyl）-N’-et...A NOS gene electrochemical biosensor was prepared by covalently immobilizing of NOS ssDNA sequence on the mercaptoacetic acid monolayer self-assembled gold electrode with the help of N-（3-dimethylaminopropyl）-N’-ethylcarbodiimide hydrochloride（EDC）and N-hydroxysuccinimide（NHS）.By using methylene blue as the electrochemical indicator,the increase of cathodic peak current was in linear with the concentration of complementary ssDNA in the concentration range of 5.0×10-8 1.0×10-4 mol/L with the linear regression equation as ΔI pc=1.10lgc+8.25（n=8,γ=0.998 5）and the detection limit as 3.60×10-8 mol/L（3σ）.展开更多
文摘We present our results from the measurements of third-order optical nonlinearity in DNA doped Rhodamine 6G/PVA films achieved through Z-scan measurements using ~2 picosecond (ps) pulses at a wavelength of 800 nm. The films demonstrated negative nonlinear refractive index (n2) with magnitudes of (0.065 - 2.89) × 10–14 cm2/W with varying concentration of DNA. Open aperture data demonstrated strong two-photon absorption with a magnitude of ~1.6 cm/GW for films doped with 2 wt% of DNA. The recovery time of excited state population, retrieved from the degenerate pump-probe experimental data, was <4 ps. These data suggests that DNA is promising material for applications such as optical switching.
文摘The mixture of Nano-graphite and organic vehicles doped to Nano-diamond paste. The suitable paste proportion was found. Nano-diamond film (NDF) was prepared by sol-gel coating method on ITO glass at 3000/min. The field emission characteristics of luminance-current, luminance-voltage and luminance-power of Nano-diamond film were analyzed and tested. Comparing these tested curves, the luminance was well proportional to current was got. Theoretic, the inner resistance of NDF field emission display (FED) consumes electric energy and real voltage change between the cathode and the anode of NDF-FED was very small after electrons emit. So the characteristic of NDF-FED was preferable to describe by luminance-current linear relationship, which was advantageous to device tested and designed.
文摘Titania thin films with hierarchically macro-mesoporous were prepared by the addition of bulky organic molecule(1,3,5-trimethylbezenze) in aqueous solution of F127(EO106PO70EO106). After calcined at 673 K,ordered thin films with cubic meso-structure and macropores were formed. DNA(Cytochrome c) was used as probe to study the adsorption ability of macromolecules on this film. The hierarchically macro-mesoporous films show high adsorption ability of DNA molecules compared with conventional titania films and mesoporous titania films,which is attributed to the presence of macropores.
文摘A NOS gene electrochemical biosensor was prepared by covalently immobilizing of NOS ssDNA sequence on the mercaptoacetic acid monolayer self-assembled gold electrode with the help of N-（3-dimethylaminopropyl）-N’-ethylcarbodiimide hydrochloride（EDC）and N-hydroxysuccinimide（NHS）.By using methylene blue as the electrochemical indicator,the increase of cathodic peak current was in linear with the concentration of complementary ssDNA in the concentration range of 5.0×10-8 1.0×10-4 mol/L with the linear regression equation as ΔI pc=1.10lgc+8.25（n=8,γ=0.998 5）and the detection limit as 3.60×10-8 mol/L（3σ）.
