GaInN Quantum Wells as Optochemical Transducers for Chemical Sensors and Biosensors
Artikel i vetenskaplig tidskrift, 2017

In this paper, investigations on gallium indium nitride (GaInN) quantum well structures as optochemical transducers in (bio) chemical sensing are presented. In contrast to the conventional electrical read-out of III-nitride-based sensors, a purely optical photoluminescence read-out is performed. A significant spectral shift of the quantum well photoluminescence is observed with varying surface modification. The spectral photoluminescence shift can be attributed to an externally induced quantum confined Stark effect caused by the adsorbed species deposited on the quantum well surface. In order to improve the sensitivity of the transducer elements, different chemical surface treatments are studied. In particular, optical sensing experiments with reducing and oxidizing gases are performed in order to investigate the quantum well photoluminescence response. Additionally, optical investigations of the iron-storage molecule ferritinwith varying iron load are presented. The iron load of this molecule is generally considered as a superior biomarker for severe illnesses, such as Alzheimer's disease. In contrast to conventional fluorescent labels, GaInN quantum wells provide a much more stable luminescence signal, and hence, are promising candidates for next generation bioanalytical sensor structures.

horseradish-peroxidase

p207

france

chemical sensors

Engineering

iron

gan

h-chain ferritin

mechanism

Physics

transistors

biosensing

rasbourg

Optics

nanowires

gallium indium nitride (GaInN)

ferritin bound iron

ferritin

v93

system

molecule

Apoferritin

surface

Författare

D. Heinz

Universität Ulm

F. Huber

Chalmers University of Technology

M. Spiess

Universität Ulm

Muhammad Asad

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

L. Wu

Universität Ulm

O. Rettig

Universität Ulm

D. H. Wu

Universität Ulm

B. Neuschl

Chalmers University of Technology

S. Bauer

Chalmers University of Technology

Y. Z. Wu

Universität Ulm

S. Chakrabortty

Universität Ulm

N. Hibst

Universität Ulm

S. Strehle

Universität Ulm

T. Weil

Universität Ulm

K. Thonke

Chalmers University of Technology

F. Scholz

Universität Ulm

IEEE Journal on Selected Topics in Quantum Electronics

1077-260X (ISSN)

Vol. 23 7592885

Ämneskategorier

Atom- och molekylfysik och optik

DOI

10.1109/jstqe.2016.2617818