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Paper   IPM / Physic / 11831
School of Physics
  Title:   Synthesis of Silver Nanoparticles Array and Application of Their Localized Surface Plasmon Resonance in Biosensor Design
  Author(s): 
1.  T. Ghodselahi
2.  T. Neishaboory nejad
3.  M. A . Vesaghi
4.  K. Zand Salimi
5.  H . Mobasheri
  Status:   In Proceedings
  Proceeding: Proceedings of 2010 International Conference on Nanotechnology and Biosensors (ICNB 2010), p59-61, 28 to 30 December 2010, Hong Kong, China
  Year:  2011
  Publisher(s):   IEEE
  Supported by:  IPM
  Abstract:
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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