Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.2: Poster

Mittwoch, 22. März 2017, 17:00–19:00, P2-EG

Flexible, robust and conformal SERS active substrates for rapid trace detection of pesticides — •Samir Kumar and J P Singh — Department of Physics, Indian Institute of Technology Delhi

Silicon wafers and glass slides are two of the most common substrates used for the growth of SERS active layers. However, these substrates are rigid and brittle and hence, these static substrates severely limit the application of plasmonic nanostructures. The metal nanostructures deposited by using conventional techniques such as physical vapor deposition suffers from a low adhesion strength of Ag or Au on to silicon or glass substrates. Here, we demonstrate a simple and facile method for fabricating highly adhesive large area AgNRs arrays embedded in the PDMS film SERS-active, flexible and robust substrate for conformal and rapid extraction and detection of trace molecules. The AgNRs arrays were grown over Si(100) substrates by thermal evaporation of silver powder using glancing angle deposition (GLAD) technique. The AgNRs arrays were embedded in low index PDMS to achieve enhanced portability and mechanical stability. The embedded AgNRs layers show good adhesion onto the PDMS surface. The in situ SERS measurements on these flexible substrates under mechanical tensile strain conditions showed that flexible SERS substrates can withstand a tensile strain (є) value as high as 30% without losing SERS performance. Through strongly enhanced Raman signals on the AgNRs embedded SERS substrate, pesticide thiram was effectively detected on apple peels at concentrations as low as 2.4×10⁻⁹ g/cm².