Coherently Embedded Ag Nanostructures in Si: 3D Imaging and their application to SERS

R. R. Juluri; A. Rath; A. Ghosh; A. Bhukta; R. Sathyavathi; D. Narayana Rao; Knut Müller; Marco Schowalter; Kristian Frank; Tim Grieb; Florian Krause; A. Rosenauer; P. V. Satyam

doi:10.1038/srep04633

Coherently Embedded Ag Nanostructures in Si: 3D Imaging and their application to SERS

R. R. Juluri, A. Rath, A. Ghosh, A. Bhukta, R. Sathyavathi, D. Narayana Rao, Knut Müller, Marco Schowalter, Kristian Frank, Tim Grieb, Florian Krause, A. Rosenauer, P. V. Satyam^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 GeO_x 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^-10M concentrations. These are expected to be one of the highly robust, reusable and novel substrates for single molecule detection.

Original language	English
Article number	4633
Journal	Scientific Reports
Volume	4
DOIs	https://doi.org/10.1038/srep04633
State	Published - 10 Apr 2014
Externally published	Yes

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title = "Coherently Embedded Ag Nanostructures in Si: 3D Imaging and their application to SERS",

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 × 10-10M concentrations. These are expected to be one of the highly robust, reusable and novel substrates for single molecule detection.",

author = "Juluri, {R. R.} and A. Rath and A. Ghosh and A. Bhukta and R. Sathyavathi and Rao, {D. Narayana} and Knut M{\"u}ller and Marco Schowalter and Kristian Frank and Tim Grieb and Florian Krause and A. Rosenauer and Satyam, {P. V.}",

note = "Funding Information: Prof PVS{\textquoteright}s work has been funded by the Department of Atomic Energy, Government of India for project No. 12-R&D-IOP-5.09-0100 for whole project. The authors acknowledge Department of Science and Technology, India for the financial support and Saha Institute of Nuclear Physics, India for facilitating the experiments at the Indian Beamline, Photon Factory, KEK, Japan. DNR{\textquoteright}s work has been funded by Department of Science and Technology – ITPAR – Phase – 3 project and RS{\textquoteright}s work has been funded by Department of Science and Technology PURSE Fellowship.",

year = "2014",

month = apr,

day = "10",

doi = "10.1038/srep04633",

language = "אנגלית",

volume = "4",

journal = "Scientific Reports",

issn = "2045-2322",

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T1 - Coherently Embedded Ag Nanostructures in Si

T2 - 3D Imaging and their application to SERS

AU - Juluri, R. R.

AU - Rath, A.

AU - Ghosh, A.

AU - Bhukta, A.

AU - Sathyavathi, R.

AU - Rao, D. Narayana

AU - Müller, Knut

AU - Schowalter, Marco

AU - Frank, Kristian

AU - Grieb, Tim

AU - Krause, Florian

AU - Rosenauer, A.

AU - Satyam, P. V.

N1 - Funding Information: Prof PVS’s work has been funded by the Department of Atomic Energy, Government of India for project No. 12-R&D-IOP-5.09-0100 for whole project. The authors acknowledge Department of Science and Technology, India for the financial support and Saha Institute of Nuclear Physics, India for facilitating the experiments at the Indian Beamline, Photon Factory, KEK, Japan. DNR’s work has been funded by Department of Science and Technology – ITPAR – Phase – 3 project and RS’s work has been funded by Department of Science and Technology PURSE Fellowship.

PY - 2014/4/10

Y1 - 2014/4/10

N2 - 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 × 10-10M concentrations. These are expected to be one of the highly robust, reusable and novel substrates for single molecule detection.

AB - 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 × 10-10M concentrations. These are expected to be one of the highly robust, reusable and novel substrates for single molecule detection.

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Coherently Embedded Ag Nanostructures in Si: 3D Imaging and their application to SERS

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