GaInN Quantum Wells as Optochemical Transducers for Chemical Sensors and Biosensors
Journal article, 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.

surface

Apoferritin

p207

gallium indium nitride (GaInN)

ferritin bound iron

system

france

biosensing

ferritin

mechanism

Physics

Engineering

chemical sensors

iron

v93

Optics

molecule

rasbourg

gan

h-chain ferritin

nanowires

transistors

horseradish-peroxidase

Author

D. Heinz

University of Ulm

F. Huber

Student at Chalmers

M. Spiess

University of Ulm

Muhammad Asad

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

L. Wu

University of Ulm

O. Rettig

University of Ulm

D. H. Wu

University of Ulm

B. Neuschl

University of Ulm

S. Bauer

University of Ulm

Y. Z. Wu

University of Ulm

S. Chakrabortty

University of Ulm

N. Hibst

University of Ulm

S. Strehle

University of Ulm

T. Weil

University of Ulm

K. Thonke

University of Ulm

F. Scholz

University of Ulm

IEEE Journal on Selected Topics in Quantum Electronics

1077-260X (ISSN)

Vol. 23 2 7592885

Subject Categories

Atom and Molecular Physics and Optics

DOI

10.1109/jstqe.2016.2617818

More information

Latest update

12/10/2019