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.
mechanism
iron
surface
Physics
molecule
nanowires
france
system
ferritin bound iron
Engineering
horseradish-peroxidase
gan
gallium indium nitride (GaInN)
chemical sensors
h-chain ferritin
Optics
ferritin
p207
transistors
rasbourg
v93
biosensing
Apoferritin
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 of Selected Topics in Quantum Electronics
1077-260X (ISSN) 15584542 (eISSN)
Vol. 23 2 15-23 7592885Subject Categories
Atom and Molecular Physics and Optics
DOI
10.1109/jstqe.2016.2617818