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  4. Impact of surface chemistry and doping concentrations on biofunctionalization of GaN/Ga-In-N quantum wells
 
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2020
Journal Article
Title

Impact of surface chemistry and doping concentrations on biofunctionalization of GaN/Ga-In-N quantum wells

Abstract
The development of sensitive biosensors, such as gallium nitride (GaN)-based quantum wells, transistors, etc., often makes it necessary to functionalize GaN surfaces with small moleculesor eVen biomolecules, such as proteins. As a first step in surface functionalization, we have investigated silane adsorption, as well as the formation of very thin silane layers. In the next step, the immobilization of the tetrameric protein streptavidin (as well as the attachment of chemically modified irontransport protein ferritin (ferritin-biotin-rhodamine complex)) was realized on these films. The degree of functionalization of the GaN surfaces was determined by fluorescence measurements with fluorescent-labeled proteins; silane film thickness and surface roughness were estimated, and also other surface sensitive techniques were applied. The formation of a monolayer consisting of adsorbed organosilanes was accomplished on Mg-doped GaN surfaces, and also functionalization with proteins was achieved. We found that very high Mg doping reduced the amount of surface functionalized proteins. Most likely, this finding was a consequence of the lower concentration of ionizable Mg atoms in highly Mg-doped layers as a consequence of self-compensation effects. In summary, we could demonstrate the necessity of Mg doping for achieving reasonable bio-functionalization of GaN surfaces.
Author(s)
Naskar, Nilanjon
Institut of Inorganic Chemistry, Ulm
Schneidereit, Martin F.
Institute of Functional Nanosystems, Ulm
Huber, Florian
Institute of Quantum Matter/ Semiconductor Physics Group, Ulm
Chakrabortty, Sabyasachi
Instiute of Inorganic Chemistry, Ulm; SRM University Ap Andhra Pradesh, India
Veith, Lothar
Max Planck Institute for Polymer Research, Mainz
Metzger, Markus
Max Planck Institute for Polymer Research, Mainz
Kirste, Lutz  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Fuchs, Theo
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Diemant, Thomas
Institute of Surface Chemistry and Catalysis, Ulm
Weil, Tanja
Institute of Inorganic Chemistry, Ulm; Max Planck Institute for Polymer Research, Mainz
Behm, R. Jürgen
Institute of Surface Chemistry and Catalysis, Ulm
Thonke, Klaus
Institute of Quantum Matter/ Semiconductor Physics Group, Ulm
Scholz, Ferdinand
Institute of Functional Nanosystems, Ulm
Journal
Sensors. Online journal  
Open Access
DOI
10.24406/publica-r-263707
10.3390/s20154179
File(s)
N-597063.pdf (1.91 MB)
Rights
CC BY 4.0: Creative Commons Attribution
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • n-type

  • p-type GaN

  • biosenor

  • chemical functionalization

  • protein adsorption

  • self-assembled monolayer

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