Volume 53, Issue 46 pp. 12528-12531
Communication

Using Ambient Ion Beams to Write Nanostructured Patterns for Surface Enhanced Raman Spectroscopy

Dr. Anyin Li

Corresponding Author

Dr. Anyin Li

Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

Anyin Li, Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

Thalappil Pradeep, DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras (IITM), Chennai, 600 036 (India)

R. Graham Cooks, Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

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Zane Baird

Zane Baird

Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

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Dr. Soumabha Bag

Dr. Soumabha Bag

Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

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Depanjan Sarkar

Depanjan Sarkar

DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras (IITM), Chennai, 600 036 (India)

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Anupama Prabhath

Anupama Prabhath

DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras (IITM), Chennai, 600 036 (India)

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Prof. Thalappil Pradeep

Corresponding Author

Prof. Thalappil Pradeep

DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras (IITM), Chennai, 600 036 (India)

Anyin Li, Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

Thalappil Pradeep, DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras (IITM), Chennai, 600 036 (India)

R. Graham Cooks, Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

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Prof. R. Graham Cooks

Corresponding Author

Prof. R. Graham Cooks

Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

Anyin Li, Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

Thalappil Pradeep, DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras (IITM), Chennai, 600 036 (India)

R. Graham Cooks, Department of Chemistry and Center for Advanced Analytical Instrumentation Development, Purdue University, 560 Oval Drive, West Lafayette, IN 47907 (USA)

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First published: 04 September 2014
Citations: 63

We acknowledge financial support from the Separations and Analysis Program, Office of Basic Energy Sciences, US Department of Energy, DE-FG02-06ER15807 and funding from NASA-PIDDP (grant number NNX12AB16G). Equipment support from the Nano Mission, Government of India is acknowledged. Part of the research was performed while A.L. was visiting IITM.

Graphical Abstract

Electrolytic spray deposition was employed for the formation of nanoparticle spots on various substrates in air. These materials are rugged, versatile substrates for surface-enhanced Raman spectroscopy, in which they lead to good enhancements. Lithographic applications of this method of ion deposition were also investigated.

Abstract

Electrolytic spray deposition was used to pattern surfaces with 2D metallic nanostructures. Spots that contain silver nanoparticles (AgNP) were created by landing solvated silver ions at desired locations using electrically floated masks to focus the metal ions to an area as little as 20 μm in diameter. The AgNPs formed are unprotected and their aggregates can be used for surface-enhanced Raman spectroscopy (SERS). The morphology and SERS activity of the NP structures were controlled by the surface coverage of landed silver ions. The NP structures created could be used as substrates onto which SERS samples were deposited or prepared directly on top of predeposited samples of interest. The evenly distributed hot spots in the micron-sized aggregates had an average SERS enhancement factor of 108. The surfaces showed SERS activity when using lasers of different wavelengths (532, 633, and 785 nm) and were stable in air.

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