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A functional immobilization of semiconductor nanoparticles (quantum dots) on nanoporous aluminium oxide
Author(s) -
Hobler Christian,
Bakowsky Udo,
Keusgen Michael
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200983313
Subject(s) - surface modification , nanoparticle , biosensor , materials science , nanotechnology , quantum dot , semiconductor , membrane , nanoporous , fluorescence , chemical engineering , chemistry , optoelectronics , engineering , biochemistry , physics , quantum mechanics
Semiconductor nanoparticles (so‐called ‘quantum dots’, QDs) are investigated for about 20 years because of their unique fluorescent and semiconductive properties. QDs were mainly used for analytical systems outside and inside a living organism. However, for most of these analytical systems, surface of QDs has to be modified. Immobilization techniques for semiconductor nanoparticles are showing wide interests within solar‐cell technologies and biosensor development. A functional inorganic/organic hybrid nanosystem could be realized by combination of an inorganic synthesis of semiconductor nanoparticles with commonly used amino acid chemistry on the surface of extremely hydrophilic aluminium oxide filter membranes. 3‐Aminopropyle‐triethoxysilane (APTES), allyloxy‐trimethylsilane and Fmoc‐( S ‐t‐Bu)‐cystine were used for surface modification. After cleavage of protective groups Fmoc and t‐Bu, semiconductor nanoparticles were immobilized by self‐assembly on filter surface. The immobilization can be explained according to commonly used ligand‐exchange reactions. This technique results in strongly fluorescent surfaces presenting an additional amino‐group for further functionalization. The obtained membranes are suitable for various diagnostic applications like multi‐parameter immunoassays and array applications at nanoscale.