User Manual for Silmeco SERStrates
Contents
1. Gsimeco SILMECO SERSTRATE USER MANUAL wm User Manual for Silmeco SERStrates measure correctly Please follow these three simple steps to get optimal results 1 Do not wash sonicate treat the SERStrates prior to analyte deposition 2 Deposit a droplet of the analyte on the SERStrate and let it dry Use e g water ethanol or isopropanol solvents 3 Measure If you want to measure molecules in gas phase please see next page For more information please visit www silmeco com 1of3 Gsimeco SILMECO SERSTRATE USER MANUAL w Gas sensing with SERStrate You can use the SERStrates for gas sensing in two ways both of which take advantage of the unique nanopillar structure The key aspect is to have the pillars lean together in the presence of your analyte to achieve the highest enhancement when doing the Raman measurement Nanopillar leaning Nanopillar leaning is achieved by having a solvent evaporate on the SERStrate We recommend you use purified water The SERStrate do not need any processing or cleaning before use Handle them at the edges and avoid touching the surface of the active the brownish bronze reddish side in the case of gold and the light beige tone for silver side of the SERStrate Will my gas bind to gold This could play a role in which of the following two methods is best METHOD 1 Direct 1 Expose the surface of the SERStrate to your gas The SERStrate can be placed in a gas flow cell if needed 2 P2. lace a droplet of water 1pIl and let the droplet evaporate The nanopillars under the droplet will lean together as the droplet evaporates hence forming electromagnetic hot spots You will be able to see that the substrates changes into a darker color tone 3 Perform the Raman measurement within this darker area this is where the nanopillars lean i e with the most hot spots We recommend you start with low laser power and work your way up NOTE There is a risk that you wash away your analyte with method 1 therefore please consider method 2 METHOD 2 Pre leaning 1 Pre lean the nanopillars by depositing a droplet of water 1pl on the surface and let it evaporate This will cause the pillars to lean and create the hot spots 2 Expose the SERStrate to your analyte gas 3 Perform the Raman measurement inside the darker area where the nanopillars are leaning Method 2 is slightly less sensitive than method 1 but has the advantage that you can measure immediately after gas exposure In addition you do not have to worry about water solubility of your analyte Moreover you can measure in situ with method 2 There should be enough area on a single SERStrate chip to try both methods providing you make the droplets of water small enough For more information please visit www silmeco com 2 of 3 Gsimeco SILMECO SERSTRATE USER MANUAL wm SERStrate Specifications Dimensions SERS active area Sensitivity Surface
3. metals Substrate material Sampling methods Laser excitation wavelengths Laser power density recommended 4x4 mm other dimensions are available on custom request 16 mm ppm to ppb Ag or Au Nanostructured Si Vapor deposition drop deposition substrate incubation immersion 514 silver 532 silver 633 silver 780 785 silver gold nm lt 10 W cm Questions related to SERS pricing options etc Order SERS substrates at www silmeco com order FAQ available at www silmeco com faq Knowledge Base available at www silmeco com knowledge base Email info silmeco com For more information please visit www silmeco com 3 of 3
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