Fe^(3+)对植酸封端的金纳米颗粒SERS性能的影响

Influence of Fe^(3+) on SERS Performance of Phytic Acid Terminated Gold Nanoparticles

利用植酸(IP6)、柠檬酸三钠和硝酸银的氧化还原制备了银纳米粒子,基于银纳米粒子与氯金酸的置换反应制备了IP6封端的金纳米颗粒,研究了该纳米颗粒的粒径分布和组成,结果显示:该纳米颗粒的均匀性良好;通过合成表面增强拉曼散射(SERS)基底可以准确有效地检测拉曼探针,检测极限可以达到10^(-8) mol·L^(-1);当添加质量分数为0.28×10^(-6)～0.56×10^(-6)的Fe^(3+)时,IP6与Fe^(3+)形成的螯合物可以增加热点数,使SERS增强效果及检测灵敏度得到提升。

Silver nanoparticles are prepared by redox reduction of phytic acid(IP6),trisodium citrate and silver nitrate,and IP6 terminated gold nanoparticles are synthesized by displacement reaction of silver nanoparticles with chloroauric acid.The particle size distribution and composition are studied,and it is found that the uniformity of the nanoparticles is favorable.By synthesizing surface enhanced Raman scattering(SERS)substrate,Raman probes can be accurately and efficiently detected,and the detection limit can reach 10-8 mol·L-1.When a proper amount of Fe3+(mass fraction from 0.28×10-6 to 0.56×10-6)is added,IP6 forms a chelate with Fe3+,which increases the number of hot spots and further enhances the SERS enhancement effect and detection sensitivity.