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Photoluminescence effects on gold nano‐ particles modified by short single stranded DNA molecules
Author(s) -
Kysil O.,
Simonova K.,
Frolov V.,
Buzaneva E.,
Köhler M.,
Gobsch G.,
Ritter U.,
Scharff P.
Publication year - 2009
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200800443
Subject(s) - photoluminescence , biomolecule , colloidal gold , nanoparticle , nanotechnology , molecule , materials science , biosensor , gold cluster , chemistry , optoelectronics , electronic structure , computational chemistry , organic chemistry
The concept for a function of gold nanoparticle photosensor based on gold nanoparticle optical properties, depending on the size and architecture of their self – assemblies, is revised from the studies of modified by short ssDNA (5.4 nm length) selected gold nanoparticle (8.6 nm diameter) assembling in biosuspensions. Biosensing effect, collective photoluminescence in visible range of different size 2D, 3D assemblies from these nanoparticles, is revealed due to their controlled assembling in biosuspesions, dependent on ssDNA conformation, that changes gold core capping and therefore a force of interparticle interaction. Nanophotosensor is characterized by intensive photoluminescence maxima in two regions of visible range for tested biosuspensions due to detected difference in the self ‐ assemblies’ architecture of gold nanoparticles with different gold core capping by the ssDNA molecules. The emission maxima are 4.2x10 3 pps and 4.1x10 4 pps in (525–780) nm and (780–920) nm regions mainly for 2D assemblies as nanowires and 3D assemblies as circle holms, correspondently, in DNA buffer suspensions with different biomolecules. The results are explained addressing photoluminescence of gold nanoparticle assemblies to system of discrete electron states in valence and conductivity bands for gold nanoparticle model.