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Biomolecular sensing using gold nanoparticle–coated ZnO nanotetrapods

Published online by Cambridge University Press:  11 August 2011

Ramakrishna Podila ,
Pengyu Chen ,
Jason Reppert ,
Apparao M. Rao  and
Pu Chun Ke
Ramakrishna Podila
Affiliation:
Department of Physics and Astronomy, Center for Optical Material Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634
Pengyu Chen
Affiliation:
Laboratory of Single-Molecule Biophysics and Polymer Physics, Clemson University, Clemson, South Carolina 29634
Jason Reppert
Affiliation:
Department of Physics and Astronomy, Center for Optical Material Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634
Apparao M. Rao*
Affiliation:
Department of Physics and Astronomy, Center for Optical Material Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634
Pu Chun Ke*
Affiliation:
Department of Physics and Astronomy, Center for Optical Material Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634; and Laboratory of Single-Molecule Biophysics and Polymer Physics, Clemson University, Clemson, South Carolina 29634
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

Gold nanoparticle–coated ZnO tetrapods have been utilized as a substrate for the detection of fluorescently labeled protein tetramethylrhodamine isothiocyanate bovine serum albumin and phospholipid 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine-N-(Lissamine rhodamine B sulfonyl) down to the concentrations of 15 pM and 79 nM, respectively. Our detection scheme is based on enhanced fluorescence excitation of the biomolecular analytes by the surface plasmon polaritons of gold nanoparticles coated on the ZnO tetrapod whiskers. This enhanced excitation is confirmed using COMSOL Multiphysics, where the optical near field is shown to be dependent on the coating density of the gold nanoparticles and branching of the ZnO nanostructures.

Keywords

BiologicalNanostructureSensor
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 17: Focus Issue: Nanowires: Fundamentals and Applications , 14 September 2011 , pp. 2328 - 2333
Copyright
Copyright © Materials Research Society 2011

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