Dehydration Sensing of a Polyvinyl Alcohol Film via Plasmonic Nanoparticles
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.58
Dehydration Sensing of a Polyvinyl Alcohol Film via Plasmonic Nanoparticles Milana O. Lisunova1-2 1
School of Materials Science and Engineering and School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
2
MicroElectronics-Photonics Program, Institute for Nanoscience and Engineering and Ralph E. Martin Department of Chemical Engineering, 3202 Bell Engineering Center, University of Arkansas, Fayetteville, AR 72701,USA
ABSTRACT
In situ, real-time monitoring of a dehydration of poly(vinyl alcohol) (PVA) film is researched. The technique based on the incorporation plasmonic nanocages (NCs) between the two identical layers of PVA, (PVA)/NCs/(PVA) film, and its sensitivity to the variation of the refractive index of the surrounding PVA film via desorption water. The dehydration time increases from 180 (s) to 1800 (s) as the content of the PVA in the films increases twice, from (PVA)/NCs/(PVA) to (PVA)2/NCs/(PVA)2. Such effect could be explained by different rate of the molecules desorption from the PVA based films. Specifically, the dehydration rate is of 0.22 (vol% per s) and 0.026 (vol% per s) for (PVA)/NCs/(PVA) and (PVA) 2/NCs/(PVA)2 films, respectively. The dehydration rate constant reduces from -5010-4 (s-1) to -4.3 10-4 (s-1) as the content of PVA increases from (PVA)/NCs/(PVA) to (PVA) 2/NCs/(PVA)2 films, respectively.
INTRODUCTION It is well known that plasmonic nanoparticles possess a high sensitivity to the refractive index of the surrounding medium. Such capabilities already widely explored in bio-plasmonic detectors to sense adsorption events [1]. The plasmonic nanoparticles had been used to sense the vapour of the hazardous solvent [2-4]. However, the hydration/dehydration sensing by plasmonic nanoparticles which detects water molecules absorption/desorption by soft matter has not been studied yet. The dehydration sensing of the soft matter is of a particular interest due to the difficulties
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of the utilization standard techniques in characterization dehydration process of the ultrathin films or their complexity. Therefore the development novel approach to control water molecules desorption seems a great challenge. Moreover, the non-traditional method of the water molecules absorption/desorption studies in the soft matter [4] to simulate tissue are required [5-7]. Among prospective candidates for the refractive index sensitivity by plasmonic nanoparticles [8] are relatively new type materials such as plasmonic nanocages (NCs) [9-10]which possess the ultra-high refractive index sensitivity of ~1000 nm/RIU [11-15]. Such high refractive index sensitivity by NCs allows distinguishing minor changes in refractive index of about 0.01 RIU to 0.001 RIU [16]. The a
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