On-chip monitoring of toxic gases: capture and label-free SERS detection with plasmonic mesoporous sorbents
Marta Lafuente, Fernando Almazán, Eduardo Bernad, Ileana Florea, Raúl Arenal, Miguel Urbiztondo, Reyes Mallada, M.P. Pina
Abstract
SERS active area and over a range of concentrations from 100 ppbV to 2.5 ppmV. The preconcentration-based SERS signal amplification by the mesoporous silica moieties is evaluated against dense silica counterparts, denoted as Stöber@Au. To assess the potential for applications in the field, the microfluidic SERS chip has been interrogated with a portable Raman spectrometer, evaluated with temporal and spatial resolution and subjected to several gas detection/regeneration cycles. The reusable SERS chip shows exceptional performance for the label-free monitoring of 2.5 ppmV gaseous DMMP.
Topics & Concepts
Mesoporous materialNanotechnologyChipPlasmonMaterials scienceChemistryOptoelectronicsComputer scienceTelecommunicationsOrganic chemistryCatalysisGold and Silver Nanoparticles Synthesis and ApplicationsAdvanced biosensing and bioanalysis techniquesBiosensors and Analytical Detection