原位电化学氧化还原制备高性能表面增强拉曼散射银纳米颗粒薄膜  

Redox-mediated in-situ fabrication of nanoparticle-packed porous Ag films with excellent surface-enhanced Raman scattering performance

作　　者：雷浩 李艳[1] 郭孟伟 张启波[1,3] Hao LEI;Yan LI;Meng-wei GUO;Qi-bo ZHANG(Key Laboratory of Ionic Liquids Metallurgy,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Shenzhen Key Laboratory of Flexible Printed Electronics Technology,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院离子液体冶金实验室,昆明650093 [2]哈尔滨工业大学(深圳)深圳市柔性印刷电子技术研究中心,深圳518055 [3]昆明理工大学云南省复杂有色金属资源清洁利用国家重点实验室,昆明650093

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第2期539-552,共14页中国有色金属学报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(No.21962008);the Yunnan Province Excellent Youth Fund Project,China(No.202001AW070005);the Candidate Talents Training Fund of Yunnan Province,China(Nos.2017PY269SQ,2018HB007);the Yunnan Ten Thousand Talents Plan Young&Elite Talents Project,China(No.YNWR-QNBJ-2018-346)。

摘　　要：在适当p H范围的碱性溶液中,通过施加氧化还原电位实现光滑Ag基体原位转化为纳米多孔结构,此纳米多孔结构由平均尺寸为21.88nm的Ag纳米颗粒(AgNPs)组成。系统研究电化学氧化还原调控制备AgNPs电极过程中Ag基体的物相和形貌演化过程:在可控氧化还原电位的作用下,光滑Ag基体首先被电化学氧化为Ag_(2)O,引起晶胞体积膨胀,随后电化学还原生成金属Ag,伴随体积收缩。晶胞体积在可逆电化学转化过程中的膨胀和收缩导致Ag基体表面原位形成高孔隙结构。采用该方法制备的AgNPs电极呈现优异的表面增强拉曼散射性能,将其作为衬底检测罗丹明6G溶液时,拉曼光谱检测限可低至5.44×10^(-10)mol/L。Smooth Ag substrate achieved in-situ conversion to form nanoporous architecture that is assembled by highly dispersed nanoparticles(NPs)with a mean size of 21.88 nm by applying a redox potential signal in an alkaline solution with an appropriate p H range.The detailed phase constitution and microstructure evolution process of the Ag substrate induced by the electrochemical redox tuning approach were systemically investigated.Under the action of controllable redox potentials,the smooth Ag substrate is firstly electrochemically oxidized to form Ag_(2)O with an expansion on the unit volume,followed by electrochemical reduction back to metallic Ag,causing the cell volume to shrink.The expansion and contraction of the unit volume during the highly reversible electrochemical process lead to in-situ formation of the highly porous Ag architectures.The fabricated Ag NPs-packed electrode exhibits as an excellent surface-enhanced Raman scattering(SERS)performance,and the measured Raman spectrum of Rhodamine 6G(R6G)reaches a detection limit of 5.44×10^(-10)mol/L.

关 键 词：电化学氧化还原 银纳米颗粒 多孔薄膜 表面增强拉曼散射性能 

分 类 号：TB383.2[一般工业技术—材料科学与工程]