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.
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
Författare
D. Heinz
Universität Ulm
F. Huber
Student vid Chalmers
M. Spiess
Universität Ulm
Muhammad Asad
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
L. Wu
Universität Ulm
O. Rettig
Universität Ulm
D. H. Wu
Universität Ulm
B. Neuschl
Universität Ulm
S. Bauer
Universität Ulm
Y. Z. Wu
Universität Ulm
S. Chakrabortty
Universität Ulm
N. Hibst
Universität Ulm
S. Strehle
Universität Ulm
T. Weil
Universität Ulm
K. Thonke
Universität Ulm
F. Scholz
Universität Ulm
IEEE Journal of Selected Topics in Quantum Electronics
1077-260X (ISSN) 15584542 (eISSN)
Vol. 23 2 15-23 7592885Ämneskategorier
Atom- och molekylfysik och optik
DOI
10.1109/jstqe.2016.2617818