载Au@Ag核壳复合双金属纳米棒的复合滤纸用作SERS基底

Study on Au@Ag Core-Shell Composite Bimetallic Nanorods Laoding Filter Paper as SERS Substrate

通过静电相互作用将单分散性良好的Au@Ag核壳复合双金属纳米棒(Au@AgNRs)负载于滤纸,制得载Au@AgNRs的复合滤纸。用扫描电子显微镜观察了使用不同Au@AgNRs溶液制备的复合滤纸Au@AgNRs中的分布情况,并统计了单位面积滤纸中Au@AgNRs的粒子数。将制得的载不同数量Au@AgNRs复合滤纸用作表面增强拉曼光谱(SERS)基底,通过擦拭载玻片检测了其表面吸附的微量二硫化四甲基秋兰姆,发现使用150nmol·L^(-1)Au@AgNRs溶液制备的复合滤纸具有较好的增强效果和检测重复性,十次重复检测结果的相对标准偏差为3.1%,检测线性范围为10^(-14)~10^(-7)mol·L^(-1)。载Au@AgNRs复合滤纸可作为SERS基底用于蔬菜水果表面农残的检测。

In this paper,the Au@Ag core-shell composite bimetallic nanorods（Au@AgNRs）with good monodispersity were loaded into filter paper by electrostatic interaction to prepare composite filter paper.Moreover,the distribution of Au@AgNRs on the composite filter paper was observed by scanning electron microscopy（SEM）,and the number of Au@AgNRs in the filter paper per unit area was statistically counted.In addition,the prepared Au@AgNRs loading composite filter paper was used as a surface-enhanced Raman spectroscopy（SERS）substrate,and trace amount of tetramethylthiuram disulfide adsorbed on slide was detected by using the paper to wipen its surface.It can be seen that the composite filter paper prepared with 150nmol·L^（-1 ）Au@AgNRs solution has better enhancement effect and detection repeatability.The relative standard deviation of the results of ten repeated tests is 3.1%,and the linear detection range was 10-14-10-7mol·L-1.The prepared Au@AgNRs loading composite filter paper as a SERS substrate can be used for the detection of pesticide residues on fruits and vegetables like apple.