高温退火优化h-BN/Ag/Ag_(2)O异质结构型及表面增强拉曼散射性能研究  

Optimization of h-BN/Ag/Ag_(2)O heterostructure by high temperature annealing and its surface-enhanced Raman scattering performance

作　　者：郑林启 时术华[1] 李金泽 王子宇 李爽[1] Zheng Lin-Qi;Shi Shu-Hua;Li Jin-Ze;Wang Zi-Yu;Li Shuang(School of Science,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东建筑大学理学院,济南250101

出　　处：《物理学报》2023年第22期277-288,共12页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11905115)资助的课题。

摘　　要：由等离激元金属和半导体结合形成的金属/半导体异质结构型有利于光诱导电荷转移(PICT)效率的提高,在表面增强拉曼散射(SERS)研究中具有明显优势.本文通过对所制备的杂化底物进行热退火处理进一步提高了其SERS活性.首先,在二维六方氮化硼(h-BN)纳米片表面成功负载生长了高密度和单分散的Ag/Ag_(2)O纳米颗粒.在此基础上,通过进一步高温退火处理所得复合体系,构建出高效的电荷转移通道,从而大幅度提高了PICT效率,使化学增强得到显著提高.实验结果表明,相比于退火前,经320℃高温退火处理所得到的h-BN/Ag/Ag_(2)O复合材料作为基底,可以使结晶紫分子的SERS信号强度显著增强18倍,增强因子高达1.63145×10^(7).最后,基于h-BN/Ag/Ag_(2)O 320℃退火复合材料优异的SERS性能,实现了对食品添加剂专利蓝V的超灵敏SERS检测,其检测极限低至10-12M.本文构建的h-BN/Ag/Ag_(2)O 320℃退火复合材料兼具物理增强和化学增强,在食品添加剂的痕量分析中具有显著优势.As a commonly used food additive,synthetic dyes are widely used in foods such as beverages,sweets and dairy products,and in the food processing process.Excessive use of synthetic dyes may induce cell mutations,children’s hyperactivity,genetic diseases and even cancer,which greatly threatens human health.As a fast,cheap,stable,ultra-sensitive and accurate detection method,SERS detection can reflect rich information about molecular fingerprint through the vibration of the analyte,and accurately determine the trace quantity of synthetic dyes in the actual environment.The metal/semiconductor heterostructure formed by the combination of plasmon metal and semiconductor is advantageous for the enhancement of photoinduced charge transfer(PICT)efficiency,and has obvious advantages in the study of surface-enhanced Raman scattering.In this work,the prepared hybrid substrate is annealed to further improve the surface-enhanced Raman scattering activity.Initially,high-density and monodisperse silver/silver oxide(Ag/Ag_(2)O)nanoparticles are loaded onto twodimensional hexagonal boron nitride(h-BN)nanosheets.On this basis,by annealing the system at high temperature,an efficient charge transfer channel is constructed,which greatly improves the PICT efficiency and chemical enhancement(CM).It is confirmed experimentally that the SERS signal intensity of h-BN/Ag/Ag_(2)O material annealed at 320℃with crystal violet(CV)as probe molecule is significantly increased 18 times compared with that of unannealed material,enhancement factor(EF)reaches 16.3145×10^(7).Finally,based on the excellent SERS property of h-BN/Ag/Ag_(2)O annealed at 320℃,the SERS detection of food additive Patent Blue V(PBV)is conducted in this work.The results show that the lowest detection concentration can reach 10–12 M,and the trace detection of synthetic dye PBV is realized.It has excellent spatial uniformity and antiinterference capability,which is of great significance in implementing the actual scene detection of PBV.The h-BN/Ag/Ag_(2)O annealed at 320

关 键 词：表面增强拉曼散射 二维材料 化学增强 食品添加剂 

分 类 号：O657.37[理学—分析化学] TB333[理学—化学]