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Juluri RR, Rath A, Ghosh A, Bhukta A, Sathyavathi R, Rao DN, Müller K, Schowalter M, Frank K, Grieb T, Krause F, Rosenauer A, Satyam PV. Coherently embedded Ag nanostructures in Si: 3D imaging and their application to SERS. Sci Rep 2014; 4:4633. [PMID: 24717601 PMCID: PMC3982172 DOI: 10.1038/srep04633] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Accepted: 03/24/2014] [Indexed: 11/09/2022] Open
Abstract
Surface enhanced Raman spectroscopy (SERS) has been established as a powerful tool to detect very low-concentration bio-molecules. One of the challenging problems is to have reliable and robust SERS substrate. Here, we report on a simple method to grow coherently embedded (endotaxial) silver nanostructures in silicon substrates, analyze their three-dimensional shape by scanning transmission electron microscopy tomography and demonstrate their use as a highly reproducible and stable substrate for SERS measurements. Bi-layers consisting of Ag and GeOx thin films were grown on native oxide covered silicon substrate using a physical vapor deposition method. Followed by annealing at 800°C under ambient conditions, this resulted in the formation of endotaxial Ag nanostructures of specific shape depending upon the substrate orientation. These structures are utilized for detection of Crystal Violet molecules of 5 × 10−10 M concentrations. These are expected to be one of the highly robust, reusable and novel substrates for single molecule detection.
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Affiliation(s)
- R R Juluri
- Institute of Physics, Sachivalaya Marg, Bhubaneswar, Odisha-751005, India
| | - A Rath
- 1] Institute of Physics, Sachivalaya Marg, Bhubaneswar, Odisha-751005, India [2]
| | - A Ghosh
- Institute of Physics, Sachivalaya Marg, Bhubaneswar, Odisha-751005, India
| | - A Bhukta
- Institute of Physics, Sachivalaya Marg, Bhubaneswar, Odisha-751005, India
| | - R Sathyavathi
- School of Physics, University of Hyderabad, Hyderabad - 500 046, India
| | - D Narayana Rao
- School of Physics, University of Hyderabad, Hyderabad - 500 046, India
| | - Knut Müller
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - Marco Schowalter
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - Kristian Frank
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - Tim Grieb
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - Florian Krause
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - A Rosenauer
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - P V Satyam
- Institute of Physics, Sachivalaya Marg, Bhubaneswar, Odisha-751005, India
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Jian-Min Z, Yu-Hong H, Ke-Wei X, Vincent J. Computer simulation of symmetrical tilt grain boundaries in noble metals with MAEAM. ACTA ACUST UNITED AC 2006. [DOI: 10.1088/1009-1963/16/1/036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Xiao-Jun Z, Jian-Min Z, Ke-Wei X. Calculation of phonon spectrum for noble metals by modified analytic embedded atom method (MAEAM). ACTA ACUST UNITED AC 2006. [DOI: 10.1088/1009-1963/15/9/034] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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