Fabrication of flexible and porous surface enhanced raman scattering (SERS) substrates using nanoparticle inks

Figueroa, Manuel; Pourrezaei, Kambiz; Tyagi, Somdev

doi:doi:10.1063/1.4736871

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AIP Conference Proceedings / Volume 1461 / SECTION I: INVITED TALKS

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Fabrication of flexible and porous surface enhanced raman scattering (SERS) substrates using nanoparticle inks

AIP Conf. Proc. 1461, pp. 47-53; doi:http://dx.doi.org/10.1063/1.4736871 (7 pages)

FUNCTIONAL MATERIALS: Proceedings of the International Workshop on Functional Materials (IWFM-2011)

Date: 20–22 December 2011

Location: Berhampur, Odisha, India

Manuel Figueroa¹, Kambiz Pourrezaei¹, and Somdev Tyagi²

¹School of Biomedical Engineering, Sciences, and Health Systems, Drexel University, USA
²Department of Physics, Drexel University, Philadelphia, PA 19104, USA

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Abstract

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In order to analyze a sample using SERS, the analyte has to be brought in intimate contact with the substrate. This can be problematic when, let’s say, the molecules of interest in trace amounts are located in large volumes. For example a biotoxin aerosol in a large room or a trace amount of bio-hazardous substances mixed in large volumes of water or other liquids. In principle it is possible to filter out the molecules of interest and then deposit them on the SERS substrate for further analyses. In practice this is very cumbersome and therefore is rarely used. Here we discuss flexible and porous SERS substrates that have been fabricated by depositing silver nano-particle inks on woven or spun fabrics made of glass fiber or cellulose followed by thermal annealing at 170-200°C for 10-15 minutes. Use of microwave absorption at about 10 GHz in the polymer-nanoparticle matrix to monitor the sintering process and to optimize the SERS amplification is also discussed. By varying the annealing time, different levels of nanoparticle clustering and the consequent SERS amplification can be achieved. Sampling of large volumes using the SERS filter substrates to detect airborne molecules is also discussed.

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KEYWORDS and PACS

Keywords

annealing, fabrics, filled polymers, glass fibres, ink, nanocomposites, nanofabrication, nanoparticles, nanoporous materials, particle reinforced composites, silver, sintering, surface enhanced Raman scattering

PACS

61.43.Gt

Powders, porous materials
61.46.Df

Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
78.67.Rb

Nanoporous materials
78.67.Sc

Nanoaggregates; nanocomposites
81.16.-c

Methods of micro- and nanofabrication and processing
81.40.Gh

Other heat and thermomechanical treatments