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  Bottom-up fabrication of hybrid plasmonic sensors: gold-capped hydrogel microspheres embedded in periodic metal hole arrays

Weiler, M., Menzel, C., Pertsch, T., Alaee, R., Rockstuhl, C., & Pacholski, C. (2016). Bottom-up fabrication of hybrid plasmonic sensors: gold-capped hydrogel microspheres embedded in periodic metal hole arrays. ACS Applied Materials and Interfaces, 8(39), 26392-26399. doi:10.1021/acsami.6b08636.

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 Creators:
Weiler, Markus1, Author              
Menzel, Christoph, Author
Pertsch, Thomas, Author
Alaee, Rasoul, Author
Rockstuhl, Carsten, Author
Pacholski, Claudia1, Author              
Affiliations:
1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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Free keywords: bottom-up; hole array; hydrogel; sensor; surface plasmon resonance
 Abstract: The high potential of bottom-up fabrication strategies for realizing sophisticated optical sensors combining the high sensitivity of a surface plasmon resonance with the exceptional properties of stimuli-responsive hydrogel is demonstrated. The sensor is composed of a periodic hole array in a gold film whose holes are filled with gold-capped poly(N-isoproyl-acrylamide) (polyNIPAM) microspheres. The production of this sensor relies on a pure chemical approach enabling simple, time-efficient, and cost-efficient preparation of sensor platforms covering areas of cm2. The transmission spectrum of this plasmonic sensor shows a strong interaction between propagating surface plasmon polaritons at the metal film surface and localized surface plasmon resonance of the gold cap on top of the polyNIPAM microspheres. Computer simulations support this experimental observation. These interactions lead to distinct changes in the transmission spectrum, which allow for the simultaneous, sensitive optical detection of refractive index changes in the surrounding medium and the swelling state of the embedded polyNIPAM microsphere under the gold cap. The volume of the polyNIPAM microsphere located underneath the gold cap can be changed by certain stimuli such as temperature, pH, ionic strength, and distinct molecules bound to the hydrogel matrix facilitating the detection of analytes which do not change the refractive index of the surrounding medium significantly.

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Language(s): eng - English
 Dates: 2016-07-142016-09-092016-09-262016-10-05
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: ACS Applied Materials and Interfaces
  Abbreviation : ACS Appl. Mater. Interfaces
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 8 (39) Sequence Number: - Start / End Page: 26392 - 26399 Identifier: ISSN: 1944-8244
CoNE: https://pure.mpg.de/cone/journals/resource/1944-8244