Metal−Organic Framework Thin Film for Enhanced Localized Surface Plasmon Resonance Gas Sensing
- 14 September 2010
- journal article
- editorial
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 82 (19), 8042-8046
- https://doi.org/10.1021/ac102127p
Abstract
Despite its high refractive index sensitivity, localized surface plasmon resonance (LSPR) spectroscopy has been generally restricted to large biological analytes. Sensing of smaller molecules is a compelling target for this technique; in particular, LSPR spectroscopy could be utilized to detect hazardous or toxic gases and manage industrial processes involving gaseous chemicals. Here, we report sensing of pure gases over Ag nanoparticles using LSPR spectroscopy, where the detected changes in bulk refractive index are −4 refractive index units (RIU). We further demonstrate a novel strategy for amplifying the sensing signal by coating the plasmonic substrate with a metal−organic framework (MOF) material. Cu3(BTC)2(H2O)3, BTC = benzenetricarboxylate, was grown on Ag nanoparticles using a layer-by-layer method in order to control the MOF thickness, which we show greatly affects the sensor response. Preferential concentration of CO2 within the MOF pores produces a 14-fold signal enhancement for CO2 sensing. In principle, MOFs can be tailored for sorbing different analytes, making them ideal materials for this amplification strategy. Because the sensing signal originates in the nanoparticle extinction spectrum and not in the MOF itself, this comprises a generalizable sensing scheme applicable to any porous MOF and any analyte.This publication has 39 references indexed in Scilit:
- High-Resolution Microspectroscopy of Plasmonic Nanostructures for Miniaturized BiosensingAnalytical Chemistry, 2009
- Surface modification on silver nanoparticles for enhancing vapor selectivity of localized surface plasmon resonance sensorsSensors and Actuators B: Chemical, 2009
- High-throughput SPR sensor for food safetyBiosensors and Bioelectronics, 2009
- Biosensing with plasmonic nanosensorsNature Materials, 2008
- Dendrimer Precursors for Nanomolar and Picomolar Real-Time Surface Plasmon Resonance/Potentiometric Chemical Nerve Agent Sensing Using Electrochemically Crosslinked Ultrathin FilmsAdvanced Functional Materials, 2006
- Determination of environmental organic pollutants with a portable optical immunosensorTalanta, 2006
- Detection of a Biomarker for Alzheimer's Disease from Synthetic and Clinical Samples Using a Nanoscale Optical BiosensorJournal of the American Chemical Society, 2005
- Surface-Based Gold-Nanoparticle Sensor for Specific and Quantitative DNA Hybridization DetectionLangmuir, 2003
- Biomolecular Recognition Based on Single Gold Nanoparticle Light ScatteringNano Letters, 2003
- A Nanoscale Optical Biosensor: Sensitivity and Selectivity of an Approach Based on the Localized Surface Plasmon Resonance Spectroscopy of Triangular Silver NanoparticlesJournal of the American Chemical Society, 2002