FORMATION AND pH-CONTROLLED ASSEMBLY OF POLY(METHYLACRYLIC ACID) MONOLAYER PROTECTED GOLD NANOPARTICLES

Jun-bo Li; Gui-zhen Li; Chen Han; De-guang Du; Li-hui Xiao; Jun-kai Zhang; Hui-yun Zhou

doi:10.3724/SP.J.1105.2012.12004

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FORMATION AND pH-CONTROLLED ASSEMBLY OF POLY(METHYLACRYLIC ACID) MONOLAYER PROTECTED GOLD NANOPARTICLES

Research Article | 更新时间：2021-03-19

- FORMATION AND pH-CONTROLLED ASSEMBLY OF POLY(METHYLACRYLIC ACID) MONOLAYER PROTECTED GOLD NANOPARTICLES
- Acta Polymerica Sinica Issue 11, Pages: 1243-1247(2012)
- 作者机构：
  
  河南科技大学化工与制药学院,洛阳,471003
- 作者简介：
- 基金信息：
- DOI：10.3724/SP.J.1105.2012.12004
  CLC：
- Published：20 November 2012，
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Jun-bo Li, Gui-zhen Li, Chen Han, De-guang Du, Li-hui Xiao, Jun-kai Zhang, Hui-yun Zhou. FORMATION AND pH-CONTROLLED ASSEMBLY OF POLY(METHYLACRYLIC ACID) MONOLAYER PROTECTED GOLD NANOPARTICLES. [J]. Acta Polymerica Sinica (11):1243-1247(2012)
DOI：

Jun-bo Li, Gui-zhen Li, Chen Han, De-guang Du, Li-hui Xiao, Jun-kai Zhang, Hui-yun Zhou. FORMATION AND pH-CONTROLLED ASSEMBLY OF POLY(METHYLACRYLIC ACID) MONOLAYER PROTECTED GOLD NANOPARTICLES. [J]. Acta Polymerica Sinica (11):1243-1247(2012) DOI： 10.3724/SP.J.1105.2012.12004.

摘要

通过可逆断裂链转移加成聚合

制备了单分散的聚甲基丙烯酸叔丁酯

并一步水解获得了具有硫醇端基的聚甲基丙烯酸(PMAA).在还原氯金酸为金纳米粒子的同时

利用硫醇端基与金纳米粒子(GNPs)的耦合作用

一步获得了聚甲基丙烯酸单层保护的金纳米粒子.通过紫外光谱和透射电镜表征证实

金纳米粒子为单分散的球型颗粒

在水溶液中具有长期稳定性.聚甲基丙烯酸单层保护的金纳米粒子的光学性质和聚集状态

具有明显的pH响应性.在酸性条件下

由于PMAA被质子化发生疏水性转变

聚合物链收缩聚集

促使金纳米粒子之间互相靠近并聚集

其表面等离子共振吸收峰发生红移.从酸性调节为碱性后

(PMAA-@-GNPs)能重新分散

吸收峰发生蓝移.在多次循环后

溶液的光学信号能可逆互变且变化不大.

Abstract

Produced via reversible addition-fragmentation chain-transfer (RAFT) polymerization

the monodispersed and narrow molecular weight distribution polymers

poly(tert-butyl methylacrylat) (PtBMA)

were prepared by hydrolysis to poly(methylacrylic acid) (PMAA) with thiol ending groups.The PMAA monolayer protected gold nanoparticles (PMAA-@ -GNPs) were then formed through binding the thiol groups to gold surface while chloroauric acid was reduced to GNPs.Characterized by high-resolution transmission electron microscopy (HRTEM) and UV-Vis spectroscopy

the PMAA-@ -GNPs showed the formation of monodisperse spherical particles with the long-term stability in aqueous solution.The optical properties and the assembly state of the PMMA-@ -GNPs are sensitive to pH.Under acidic conditions (pH 1.5)

because of the protonated form of PMAA undergoing a hydrophobicity change

the polymer chains shrink and wrap around the GNPs surface

which leads to the GNPs assembly and an absorption red shift of the surface plasmon resonance (SPR).However

after adjusting the pH value of the solution to an alkaline environment (pH 9.2)

PMAA-@ -GNPs can be redispersed

resulting in an absorption blue shift of the SPR.And the optical signal of PMAA-@ -GNPs changes little after more cycles of the reversible assembly/dispersion processes.

关键词

聚甲基丙烯酸金纳米粒子聚集pH响应性

Keywords

Poly(methylacrylic acid)Gold nanoparticlesAssemblypH-responsive

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Related Institution

College of Materials Science and Engineering, Beijing University of Chemical Technology

Institutes for Life Sciences, School of Biomedical Sciences and Engineering, South China University of Technology

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Guangdong Provincial Key Laboratory for Green Chemical Product technology, School of Chemistry and Chemical Engineering, South China University of Technology

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