米花型银-氮化钛薄膜SERS基底的制备及罗丹明6G的检测研究  

Study on SERS substrate preparation of rice flower type silver/titanium nitride thin films and detection of Rhodamine 6G

作　　者：邸志刚 高建鑫 贾春荣 周昊 李金鑫 刘花菊 魏恒勇 Di Zhigang;Gao Jianxin;Jia Chunrong;Zhou Hao;Li Jinxin;Liu Huaju;Wei Hengyong(College of Electrical Engineering,North China University of Science and Technology,Tangshan 063210,China;College of Materials Science and Engineering,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学电气工程学院,河北唐山063210 [2]华北理工大学材料科学与工程学院,河北唐山063210

出　　处：《红外与激光工程》2024年第2期159-167,共9页Infrared and Laser Engineering

基　　金：河北省食品药品监督管理局科技计划重点项目(ZD2015016);河北省教育厅科学技术研究项目(ZD2021332);华北理工大学培育基金项目(SP201502)。

摘　　要：罗丹明6G的痕量检测需要具有较高的灵敏度,为提高SERS基底的增强因子从而提高检测灵敏度,设计了米花型SERS基底,采用有限元法对其拉曼增强效果进行仿真,模拟不同中心球半径r、米花花瓣轴a、b、c以及中心球与花瓣间距d条件下电场强度的变化,得出最佳结构参数,并计算其SERS增强因子。随后利用电化学沉积法制备该基底,并探究电压值以及柠檬酸三钠和AgNO_(3)的浓度配比对基底结构和性能的影响,从而制备出与理想物理模型形态最接近的米花型银/氮化钛薄膜基底。然后用其对罗丹明6G(R6G)进行痕量检测,探究该基底的拉曼增强效果以及稳定性。实验结果表明,当沉积电压为2V,柠檬酸三钠与AgNO_(3)浓度配比为1∶1 (2 mmol/L∶2 mmol/L)时,得到的米花型TiN-Ag复合SERS基底与理想化模型仿真形态最接近。经过计算得到该基底的增强因子可达10^(15),对罗丹明6G的检测限可达10^(-13)mol/L。实验结果证明设计的基底灵敏度高、稳定性强,可对食品非法添加剂的痕量检测提供技术支撑。Objective Rhodamine 6G(R6G),also known as Rose Red 6G,is a fluorescent dye with water solubility and is often used in optics,laser optics,dyes and other fields.It is very toxic to humans,and there is a risk of cancer from long-term exposure or use of rhodamine,so it is included in illegal additives.However,due to its low price and good coloring properties,it is often used by unscrupulous businessmen in textiles,medicine,food,etc.The current methods for detecting rhodamine are mainly high performance liquid chromatography and liquid chromatography-tandem mass spectrometry.However,the operation process is tedious and the cost is high.Therefore,it is necessary to design a new method for the rapid detection of rhodamine 6G.Methods The performance of the substrate and the minimum detection limit of rhodamine 6G were investigated.The finite element method was used to simulate the milky substrate,and a milky silver/titanium nitride composite SERS substrate was designed and Raman detected for rhodamine 6G using electrochemical deposition method.Results and Discussions In order to obtain the SERS enhancement effect of silver nanosubstrates with different morphological rice flower type structures and thus optimize the SERS substrate design,the electric field intensity simulation experiments were performed by the finite element method to simulate the changes of field intensity under different central sphere radius r,rice flower petal axes a,b,c,and central sphere and petal spacing d.The SERS enhancement factor was calculated.Subsequently,the substrates were prepared by electrochemical deposition and the effects of voltage value and the concentration ratios of trisodium citrate and AgNO_(3) on the substrate structure and properties were investigated,so as to prepare the rice flower type silver/titanium nitride thin film substrate with the closest morphology to the idealized physical model.It was then used for trace detection of rhodamine 6G(R6G)to investigate the Raman enhancement effect of this substrate as well as its stab

关 键 词：表面增强拉曼光谱 米花型结构 氮化钛薄膜 痕量检测 罗丹明6G 

分 类 号：O657.37[理学—分析化学]