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.
Apoferritin
molecule
gallium indium nitride (GaInN)
surface
p207
biosensing
iron
france
h-chain ferritin
transistors
v93
Physics
horseradish-peroxidase
chemical sensors
Engineering
system
ferritin bound iron
ferritin
gan
Optics
nanowires
rasbourg
mechanism
Author
D. Heinz
Universitat Ulm
F. Huber
Chalmers University of Technology
M. Spiess
Universitat Ulm
Muhammad Asad
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
L. Wu
Universitat Ulm
O. Rettig
Universitat Ulm
D. H. Wu
Universitat Ulm
B. Neuschl
Chalmers University of Technology
S. Bauer
Chalmers University of Technology
Y. Z. Wu
Universitat Ulm
S. Chakrabortty
Universitat Ulm
N. Hibst
Universitat Ulm
S. Strehle
Universitat Ulm
T. Weil
Universitat Ulm
K. Thonke
Chalmers University of Technology
F. Scholz
Universitat Ulm
IEEE Journal on Selected Topics in Quantum Electronics
1077-260X (ISSN)
Vol. 23 2 7592885Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
DOI
10.1109/jstqe.2016.2617818