Fiber-Optic SPR pH Sensor Based on MMF–NCF–MMF Structure and Self-Assembled Nanofilm
Like Li, Yanan Zhang
Abstract
A fiber-optic pH sensor, based on layer-by-layer (LBL) self-assembly and surface plasmon resonance (SPR) technology, is proposed and experimentally confirmed. This article proposes poly (diallyldimethylammonium chloride) (PDDA) as the pretreatment solution for the surface of the gold film and the highly sensitive polyacrylic acid/chitosan (PAA/CS) self-assembled nanomembrane as the pH-sensitive film. It has been experimentally verified that the sensor can detect pH from 3.18 to 11.84 and it exhibits a high average sensitivity of 32.31 nm/pH in this range. In addition, experiments have confirmed that the sensor has attractive stability, repeatability, and hysteresis characteristics.
Topics & Concepts
Surface plasmon resonanceMaterials sciencePolyacrylic acidHysteresisFiber optic sensorBiosensorOptical fiberRepeatabilityLayer (electronics)FiberSensitivity (control systems)Surface plasmonOptoelectronicsNanotechnologyPlasmonAnalytical Chemistry (journal)PolymerOpticsNanoparticleChemistryElectronic engineeringChromatographyComposite materialPhysicsEngineeringQuantum mechanicsAdvanced Fiber Optic SensorsAnalytical Chemistry and SensorsPolymer Surface Interaction Studies