论文部分内容阅读
Highly active,stable and affordable surface enhanced Raman scattering(SERS) substrates were obtained by electrolyzing a mixture of AgNO_3(4×10~(-4) mol/L) and Na_3C_6H_5O_7·H_2O(6×10~(-5) mol/L) for 1,2,3 and 4h at 7V.With crystal violet(CV) as a test molecule,a portable Raman spectrometer with 785 nm laser excitation was employed to carry out the SERS detection.Colloidal Ag nanoparticles prepared by electrolyzing for 3 h with the particle size of(65±17) nm is a perfect SERS substrate for the ultratrace detection of CV,which displayed an enhancement factor of ca.1.3×10~8 and the detection limit of CV is down to ca. 10~(-15)mol/L(ca.10~(-4)ppb) with 10~(-1)mol/L KBr as aggregating agent.Thus,this SERS substrate will provide a hopeful foreground in ultratrace detection.Meanwhile,it will provide a possibility to bring Raman analysis out of the laboratory to process in situ,real-time detection and identification.
Highly active, stable and affordable surface enhanced Raman scattering (SERS) substrates were obtained by electrolyzing a mixture of AgNO_3 (4 × 10 -4 mol / L) and Na_3C_6H_5O_7 · H_2O (6 × 10 -5 mol / L) for 1,2,3 and 4h at 7V.With crystal violet (CV) as a test molecule, a portable Raman spectrometer with 785 nm laser excitation was employed to carry out the SERS detection. Colloidal Ag nanoparticles prepared by electrolzing for 3 h with the particle size of (65 ± 17) nm is a perfect SERS substrate for the ultratrace detection of CV, which displayed an enhancement factor of ca 1.3 × 10 -8 and the detection limit of CV is down to ca. 10 ~ (-15) mol / L (ca.10 ~ (-4) ppb) with 10 ~ (-1) mol / L KBr as aggregating agent.Thus, this SERS substrate will provide a hopeful foreground in ultratrace detection.Meanwhile, it will provide a possibility to bring Raman analysis out of the laboratory to process in situ, real-time detection and identification.