“School of Physics”
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| Paper IPM / P / 11831 |
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| Abstract: | |||||||||||
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We introduce a method for synthesis of Twodimensional
array of silver nanoparticles. Application of these
nanoparticles array as biosensor based on Localized Surface
Plasmon Resonance (LSPR) without probe immobilization is
introduced too. Silver nanoparticles (NPs) on the carbon thin
film are prepared by co-deposition of RF-sputtering and RFPECVD
using acetylene gas and silver target. X-ray
diffraction analysis indicates that silver NPs with fcc crystal
structure are formed in our samples. Using AFM image and
data, average particles size is estimated to be about 7 nm and
indicated that array with sharp distribution of silver particle
sizes were grown. Real time of LSPR absorption peak of silver
NPs in presence of DNA primer decamer (ten-deoxycytosine)
at fM concentrations was investigated. The LSPR peak has a
blue shift and becomes damped by adding of DNA primer and
under DNA exposure up to 3h. Our sample has a good
response to low concentration of DNA without employing
probe. Furthermore, its time response of the sensor to the
introduced DNA primer was short. Both of these are prerequisite for applying this sample in biosensor design.
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