Surface Plasmon‐Based Techniques for the Analysis of Plasma Deposited Functional Films and Surfaces

Abstract

Herein we demonstrate that two surface plasmon-based techniques (i.e., SPR and OWS) allow for sensitive and real-time monitoring of plasma polymers of different thicknesses ranging from several nanometers to micrometers. Firstly, the fundamentals and the implementation of SPR/OWS are given. Examples about the use of SPR and OWS for the characterization of plasma deposited thin films are then presented, with emphasis on the stability and the swelling of those films in humid atmospheres and in aqueous media. The binding behavior of biological species (e.g., nucleic acid, protein, etc.) onto plasma polymer surfaces as seen by SPR and OWS are also discussed. The results clearly show that surface plasmon optics will play an essential part in the understanding and the future development of plasma deposited polymers. 0 200 400 600 800 1000 28 30 32 34 36 38 40 42 Reflectivity / % Time / min after extraction as deposited ppAA, 100W, CW, 0,1mbar

Immobilization of silver nanoparticles into POEGMA polymer brushes as SERS-active substrates

“…XPS curve analysis was conducted by using XPSpeak4.1. A custom‐built SPR setup based on the Kretschmann's configuration was used to measure the thickness of POEGMA brush . The light source was a He–Ne laser ( λ = 632.8 nm, laser power < 5 mW ).…”

“…Surface plasmon resonance has proved to be a sensitive optical technique for the determination of polymer film's thickness provided that its refractive index is known. [29] To avoid the humidity effect, the POEGMA sample was attached onto a flow cell, which filled with nitrogen gas. Figure 4 shows the thickness evolution of various POEGMA brushes as a function of polymerization time.…”

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Polyadenine-mediated Immobilization of Aptamers on a Gold Substrate for the Direct Detection of Bacterial Pathogens

“…S1, Supporting Information). 41,42 Briefly, a He-Ne laser (λ = 632.8 nm, laser power <5 mW) was used as a light source. The light beam passed through a chopper and two polarizers, and was then reflected from the prism base, which was detected by a photodiode and a lock-in amplifier.…”