Surface Enhanced Raman Scattering (SERS) of tetrasodium meso-tetrakis (4-sulfonatophenyl) porphine (H2TSPP) and silver tetraphenylporphyrin (Ag(Ⅱ)TSPP)adsorbed spontarleously on uniform Fe3O4 colloids are recorded. T...Surface Enhanced Raman Scattering (SERS) of tetrasodium meso-tetrakis (4-sulfonatophenyl) porphine (H2TSPP) and silver tetraphenylporphyrin (Ag(Ⅱ)TSPP)adsorbed spontarleously on uniform Fe3O4 colloids are recorded. The enhancement of Raman bands is approximately 30. An analysis of the SERS spectrum shows that on the Fe3O4 surface H2TSPP takes its diacid form H42+TSPP.展开更多
Using polyvinyl alcohol(PVA) and sodium dodecyl suifae(SDS) as the surfactans respectively, nano-size amorphous molybdenum dioxide powders were prepared by y-radiation method at ambient pressure and room temperature, ...Using polyvinyl alcohol(PVA) and sodium dodecyl suifae(SDS) as the surfactans respectively, nano-size amorphous molybdenum dioxide powders were prepared by y-radiation method at ambient pressure and room temperature, and the products were characterized by use of laser Raman spectra(LRS), X-ray powder diffraction(XRD) and transmisson electron micrograph(TEM). The experimental results reveal that the relative pure satnples can be obtained using PVA as sdrictant, and the average particle size is about 10nm, but using SDS as swhctant, the samples with the average particle size 30nm are a mixture of MoO2 and MoO3. This suggestes PVA is prior to SDS in the preparaion of nano-sized amorphous molybdenum dioxide powders by γ-radiation method.展开更多
文摘Surface Enhanced Raman Scattering (SERS) of tetrasodium meso-tetrakis (4-sulfonatophenyl) porphine (H2TSPP) and silver tetraphenylporphyrin (Ag(Ⅱ)TSPP)adsorbed spontarleously on uniform Fe3O4 colloids are recorded. The enhancement of Raman bands is approximately 30. An analysis of the SERS spectrum shows that on the Fe3O4 surface H2TSPP takes its diacid form H42+TSPP.
文摘Using polyvinyl alcohol(PVA) and sodium dodecyl suifae(SDS) as the surfactans respectively, nano-size amorphous molybdenum dioxide powders were prepared by y-radiation method at ambient pressure and room temperature, and the products were characterized by use of laser Raman spectra(LRS), X-ray powder diffraction(XRD) and transmisson electron micrograph(TEM). The experimental results reveal that the relative pure satnples can be obtained using PVA as sdrictant, and the average particle size is about 10nm, but using SDS as swhctant, the samples with the average particle size 30nm are a mixture of MoO2 and MoO3. This suggestes PVA is prior to SDS in the preparaion of nano-sized amorphous molybdenum dioxide powders by γ-radiation method.
