Stimuli-responsive SERS nanoparticles: conformational control of plasmonic coupling and surface Raman enhancement.

Stimuli-responsive SERS nanoparticles: conformational control of plasmonic coupling and surface Raman enhancement.
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DOI:
10.1021/ja902226z
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发表时间:
2009-06-10
影响因子:
15
通讯作者:
Nie S
Nie S
中科院分区:
化学1区
文献类型:
--
作者:
Qian X;Li J;Nie S

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刺激响应表面增强拉曼散射(Sers)纳米粒子是利用胶体金纳米晶体和一类由pH响应聚合物链段、两亲性聚乙二醇链段和硫辛酸锚定基团组成的硫醇化嵌段共聚物制备的。结果表明,Sers信号可以打开和关闭响应于pH值的分子构象。一个重要的发现是,中和的聚甲基丙烯酸(PMAA)分子能够与两亲性聚乙二醇(PEG)链相互作用,导致高度紧凑和混合的共聚物结构的纳米粒子的表面上。这种类型的分子构象变化提供了一种新的策略,用于控制等离子体耦合和电磁拉曼增强,并提出了使用Sers纳米粒子标签的生物分子结合和酶裂解研究的可能性。
Stimuli-responsive surface-enhanced Raman scattering (SERS) nanoparticles have been developed by using colloidal gold nanocrystals and a class of thiolated block copolymers consisting of a pH-responsive polymer segment, an amphiphilic polyethylene glycol segment, and a lipoic acid anchoring group. The results demonstrate that SERS signals can be switched on and off by molecular conformations in response to pH. An important finding is that neutralized polymethacrylic acid (PMAA) molecules are able to interact with amphiphilic polyethylene glycol (PEG) chains, leading to highly compact and intermingled copolymer structures on the surface of nanoparticles. This type of molecular conformation change provides a new strategy for controlling plasmonic coupling and electromagnetic Raman enhancement and raises the possibility of using SERS nanoparticle tags for biomolecular binding and enzymatic cleavage studies.
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