Electrochemical plasmonic sensors
Artikel i vetenskaplig tidskrift, 2012

The enormous progress of nanotechnology during the last decade has made it possible to fabricate a great variety of nanostructures. On the nanoscale, metals exhibit special electrical and optical properties, which can be utilized for novel applications. In particular, plasmonic sensors including both the established technique of surface plasmon resonance and more recent nanoplasmonic sensors, have recently attracted much attention. However, some of the simplest and most successful sensors, such as the glucose biosensor, are based on electrical readout. In this review we describe the implementation of electrochemistry with plasmonic nanostructures for combined electrical and optical signal transduction. We highlight results from different types of metallic nanostructures such as nanoparticles, nanowires, nanoholes or simply films of nanoscale thickness. We briefly give an overview of their optical properties and discuss implementation of electrochemical methods. In particular, we review studies on how electrochemical potentials influence the plasmon resonances in different nanostructures, as this type of fundamental understanding is necessary for successful combination of the methods. Although several combined platforms exist, many are not yet in use as sensors partly because of the complicated effects from electrochemical potentials on plasmon resonances. Yet, there are clearly promising aspects of these sensor combinations and we conclude this review by discussing the advantages of synchronized electrical and optical readout, illustrating the versatility of these technologies.

gold

label-free detection

single gold

nanosphere lithography

silver nanoparticles

biosensors

optical-properties

impedance spectroscopy

Electrochemistry

Optical

Electrical

thin metal-films

Plasmon

nanoparticles

Nanostructure

in-situ investigations

resonance

Sensor

Författare

Andreas Dahlin

Chalmers, Teknisk fysik, Bionanofotonik

B. Dielacher

Eidgenössische Technische Hochschule Zürich (ETH)

P. Rajendran

Eidgenössische Technische Hochschule Zürich (ETH)

K. Sugihara

Eidgenössische Technische Hochschule Zürich (ETH)

T. Sannomiya

Tokyo Institute of Technology

Marcy Zenobi-Wong

Eidgenössische Technische Hochschule Zürich (ETH)

J. Vörös

Eidgenössische Technische Hochschule Zürich (ETH)

Analytical and Bioanalytical Chemistry

1618-2642 (ISSN) 1618-2650 (eISSN)

Vol. 402 5 1773-1784

Ämneskategorier

Biofysik

DOI

10.1007/s00216-011-5404-6