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We fabricate SERS sensors by inkjet printing of colloidal Au nanoparticles on porous paper substrates. Using a modified commercial inkjet-printer, SERS sensors are prepared with multiple printing passes. SERS response is correlated with their diffuse reflectance characteristics. Chemical analyte detection is only possible with both SERS and diffuse reflectance measurements from sensors that has been subjected to more than 5 printing passes. This suggests that the simpler diffuse reflectance measurement can be used as an alternative method to characterize and optimize the SERS performance of the printed sensors. Sensors with a higher number of printing passes exhibit a much stronger SERS response from strong adsorbing analytes such as benzenethiol molecule. We compare the performances of 8 and 15 printing passes sensors with the commercially available paper-based sensors, p-SERS. We calculate their Relative Enhancement Factor (REF) by comparing their performances to the first order phonon vibration of Si, which serves as a reference standard. Lastly, we demonstrate the use of such sensors for the detection of chemical aerosols.
Conference Presentation
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Li-Lin Tay, Hal Bowen-Smith, Ali Ghaemi, Alexandre B. Cornu, John Hulse, "Enhanced Raman sensors for vapour and aerosol detection," Proc. SPIE 13117, Enhanced Spectroscopies and Nanoimaging 2024, 1311705 (4 October 2024); https://doi.org/10.1117/12.3028845