从银核到银壳:在气相中发生的原位氧化刻蚀和还原过程
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- 英文论文题名：From Silver Core to Silver Shell:A Localized Oxidative Etching and Reduction Process in the Gas Phase
- 论文作者：杨培培 ; 徐勇 ; 陈磊 ; 王旭春 ; 谢忠治 ; 王穗东 ; 包峰 ; 张桥
- 英文论文作者：Peipei Yang ; Yong Xu ; Lei Chen ; Xuchun Wang ; Zhongzhi Xie ; Sui-Dong Wang ; Feng Bao ; Qiao Zhang ; Institute of Functional Nano and Soft Materials (FUNSOM) ; Soochow University
- 年：2016
- 作者机构：苏州大学功能纳米与软物质研究院;
- 论文关键词：银纳米壳 ; 核壳结构 ; 表面拉曼增强 ; 表面等离子共振
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十一分会：胶体与界面化学
- 语种：中文
- 分类号：O614.122
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十一分会 ; 胶体与界面化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：299k
- 原文格式：D
- 会议级别：全国
摘要
我们通过一种简单的不加表面活性剂的方法,成功合成了单分散的银@间苯二酚-甲醛树脂核壳纳米结构,并且通过调节反应参数实现了对核壳尺寸的调控。系统地研究证实了间苯二酚具有双重功能:它不仅可以作为还原剂还原金属纳米粒子,还可以修饰纳米粒子表面,防止其发生团聚。此外,银壳可以通过氧化刻蚀机理形成。在氧气存在的情况下,金属银核首先与体系中的氨水反应,被氧化成银氨离子,随后被具有还原性的树脂表面还原成银颗粒。由于相邻银颗粒间强烈的表面等离子共振耦合效应,其SPR峰逐渐从420nm红移到700nm。该过程提供了一个从银核到银壳的普适方法。银纳米线@二氧化硅,以及银纳米线@二氧化硅@间苯二酚-甲醛树脂均可转移成相应的银壳结构。
We demonstrate that monodispersed Ag@RF resin core-shell nanostructure with tailored core size and shell thickness can be obtained in a facile one-step route in the absence of additional surfactants.Systematic studies reveal that resorcinol could have dual functions:it can not only act as reactant to form RF resin,but also can passivity the surface of nanoparticles to prevent them from aggregation.Besides,silver nanoshell can be obtained through a localized oxidation and reduction mechanism,in which metallic silver cores were etched first by air in the presence of ammonia,followed by the localized reduction using a reductive surface.Starting with Ag@RF resin core-shell nanoparticles,we demonstrate that RF-core@Ag-shell nanoparticles can be successfully prepared because the-OH group terminated RF surface can reduce[Ag(NH_3)_2]~+ ions to metallic Ag.Due to the strong surface plasmon resonance(SPR) coupling effect among neighboring silver nanoparticles,the SPR peak gradually shifts from ~ 420 nm to over 700 nm.This process provides a general route to the conversion of Ag-core to Ag-shell nanostructures.Both Ag-nanowires@SiO_2 and Ag-nanowires@SiO_2@RF nanostructures are converted to the corresponding SiO_2@Ag and SiO_2@RF@Ag nanostructures.
We demonstrate that monodispersed Ag@RF resin core-shell nanostructure with tailored core size and shell thickness can be obtained in a facile one-step route in the absence of additional surfactants.Systematic studies reveal that resorcinol could have dual functions:it can not only act as reactant to form RF resin,but also can passivity the surface of nanoparticles to prevent them from aggregation.Besides,silver nanoshell can be obtained through a localized oxidation and reduction mechanism,in which metallic silver cores were etched first by air in the presence of ammonia,followed by the localized reduction using a reductive surface.Starting with Ag@RF resin core-shell nanoparticles,we demonstrate that RF-core@Ag-shell nanoparticles can be successfully prepared because the-OH group terminated RF surface can reduce[Ag(NH_3)_2]~+ ions to metallic Ag.Due to the strong surface plasmon resonance(SPR) coupling effect among neighboring silver nanoparticles,the SPR peak gradually shifts from ~ 420 nm to over 700 nm.This process provides a general route to the conversion of Ag-core to Ag-shell nanostructures.Both Ag-nanowires@SiO_2 and Ag-nanowires@SiO_2@RF nanostructures are converted to the corresponding SiO_2@Ag and SiO_2@RF@Ag nanostructures.
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