Plasmonics

, Volume 8, Issue 2, pp 537–544 | Cite as

Trapping Proteins within Gold Nanoparticle Assemblies: Dynamically Tunable Hot-spots for Nanobiosensing

  • Abdennour Abbas
  • Max Fei
  • Limei Tian
  • Srikanth Singamaneni
Article

Abstract

The combination of stimuli-responsive materials with localized surface plasmon resonance nanotransducers provides new leverages in hot spot-based nanosensing. We introduce a simple and effective biodetection method based on the hydro-responsive property of (3-aminopropyl)-triethoxysilane (APTES). Gold nanoparticles were adsorbed onto hydro-responsive APTES thin film. The exposure of the film surface to an aqueous solution results in opening inter-particle gaps, allowing analyte binding. A subsequent drying of the sensor surface closes the gap by bringing the nanoparticles to the initial position, thereby trapping the analyte in the most sensitive regions (electromagnetic hot spots). In this reversible configuration, the generation and tuning of the hot spots are independent from both the presence of the analyte and the functionalization of the nanoparticles, which yields highly resolved coupled plasmon bands and provide a general and flexible nanosensing modality. Furthermore, the intensity of the hot spots can be easily and reversibly tuned to obtain picomolar sensitivity.

Keywords

Gold nanoparticles Localized surface plasmon resonance Plasmon coupling Stimuli-responsive materials Nanobiosensors 

Notes

Acknowledgments

The gold nanoparticle solution was kindly provided by Dr. Ramesh Kattumenu. This work was supported by the Office of Congressionally Directed Medical Research Programs (DoD-Army) (W81XWH-11-1-0439).

Supplementary material

11468_2012_9431_MOESM1_ESM.docx (10.5 mb)
ESM 1 (DOCX 10,742 kb)

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Abdennour Abbas
    • 1
  • Max Fei
    • 1
  • Limei Tian
    • 1
  • Srikanth Singamaneni
    • 1
  1. 1.Department of Mechanical Engineering and Materials ScienceWashington UniversitySt. LouisUSA

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