6533b854fe1ef96bd12ae9d9
RESEARCH PRODUCT
Inkjet printing Ag nanoparticles for SERS hot spots
Bruno PignataroGiuseppe ArrabitoFrancesco AmatoCarmelo MiccichèGianpiero BuscarinoSimonpietro Agnellosubject
AnalyteMaterials scienceFabricationTrace AmountsGeneral Chemical EngineeringAnalytical chemistrysers raman spectroscopy nanoparticles02 engineering and technology010402 general chemistryAlizarin01 natural sciencesAnalytical Chemistrychemistry.chemical_compoundColloidraman spectroscopyEngineering (all)MoleculeChemical Engineering (all)sersInkwellGeneral EngineeringSurface-enhanced Raman spectroscopy021001 nanoscience & nanotechnology0104 chemical scienceschemistrynanoparticles0210 nano-technologydescription
A novel inkjet printing based approach is developed for the fabrication of a customizable platform on glass substrates allowing for surface enhanced Raman spectroscopy (SERS) detection of analytes up to single hot spots generated by the spontaneous aggregation of Ag nanoparticles (Ag NPs) in pL scale droplets. After drying the printed droplets under ambient conditions, trace amounts of the analyte can be detected by SERS given the proximity to NP hot spots. By employing alizarin (10-5M) as a model system and scaling the ink droplet volume from 1 nL to 10 pL, the absolute quantity of hot spots has been derived in the printed droplets allowing detecting up to a few molecules in proximity to individual hot spots. Besides requiring a small amount of analyte (around 0.1 femtomoles) and colloidal Ag (≈20 attograms) per droplet, we show the possibility to obtain a very accurate determination of the enhancement factor (>104).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-01-01 |