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Science China Materials

, Volume 61, Issue 9, pp 1201–1208 | Cite as

Humidity-responsive nanocomposite of gold nanoparticles and polyacrylamide brushes grafted on Ag film: synthesis and application as plasmonic nanosensor

  • Huaxiang Chen (陈华祥)
  • Tingting You (尤汀汀)
  • Geng Xu (徐更)
  • Yukun Gao (高宇坤)
  • Chenmeng Zhang (张晨萌)
  • Nan Yang (杨楠)
  • Penggang Yin (殷鹏刚)
Articles
  • 54 Downloads

Abstract

A general stepwise strategy for the preparation of new humidity-responsive plasmonic nanosensor was described for the first time, based on Ag film functionalization by polyacrylamide (PAAM) brushes via surface-initiated atom transfer radical polymerization (SI-ATRP) method and then assembled with gold nanoparticles (Au NPs). We designed by this way a new plasmonic device made of Au NPs embedded in a humid vapor responsive polymer layer on Ag film and extensively characterized by surface-enhanced Raman scattering (SERS). When the relative humidity (RH) is above 50%, the number of plasmonic hotspots decreases, causing SERS signal reduced noticeably, for the volume expansion of PAAM brushes varied the nano-gap between closely spaced Au NPs, and between Au NPs and Ag film. The reversible optical properties of the prepared nanocomposite tuned by RH were probed through SERS using 4-mercaptopyridine (4-Mpy) as a molecular probe, and the decrease of the RH reversibly induces a significant enhancement of the 4-Mpy SERS signal. By means of the high reversibility, the RH responsive nanocomposite developed in this paper provides a dynamic SERS platform and can be applied as plasmonic nanosensor which is proved to be stable for at least two months.

Keywords

RH-response plasmonic nanosensor SERS 

湿度响应纳米复合材料的组装及其SERS传感器应用

摘要

本文报道了一种湿度响应纳米SERS传感器. 通过原子转移自由基聚合技术在银片表面嫁接了具有湿度响应性能的聚丙烯酰胺分子 刷, 并组装金纳米颗粒形成复合结构. 该分子刷湿度响应灵敏, 而且可有效抓取金纳米颗粒, 构成均匀分布的SERS“热点”. 通过调节湿度, 实现了SERS“热点”的可逆调控, 并通过拉曼光谱快速捕捉探针分子特征峰的SERS信号强度变化, 实现湿度响应的SERS传感功能. 湿度低 于50%时, 分子刷收缩, 金纳米颗粒间距降至纳米级, 形成大量热点, 使得SERS增强因子达到2×108; 湿度高于50%, 分子刷舒张, 金纳米颗粒 间距变大, 当湿度大于90%时, SERS“热点”最少, SERS信号最低. 可逆调控湿度变化, 得到可逆的SERS信号变化, 因此该复合材料实现了高 效灵敏的湿度响应SERS传感.

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (51572009).

Supplementary material

40843_2017_9232_MOESM0_ESM.pdf (720 kb)
Humidity-responsive nanocomposite of gold nanoparticles and polyacrylamide brushes grafted on Ag film: synthesis and application as plasmonic nanosensor

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Huaxiang Chen (陈华祥)
    • 1
  • Tingting You (尤汀汀)
    • 1
  • Geng Xu (徐更)
    • 1
  • Yukun Gao (高宇坤)
    • 1
  • Chenmeng Zhang (张晨萌)
    • 1
  • Nan Yang (杨楠)
    • 1
  • Penggang Yin (殷鹏刚)
    • 1
  1. 1.Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of Chemistry, Beihang UniversityBeijingChina

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