Optical humidity sensor based on in situ and ex situ synthesized nAg/0.1%PVP composite coated on self supported PVP substrate

Optical humidity sensor based on in situ and ex situ synthesized nAg/0.1%PVP composite coated on... An optical based humidity sensor having linear response (R = 0.99) over a wide range (06–94%RH) and high sensitiv- ity is reported using nAg/0.1%PVP nanocomposite. Nanocomposite is prepared using in-situ and ex-situ approaches by chemical reduction method with silver salt (A gNO ) as precursor, tri sodium citrate as reducing agent and PVP as capping agent. The nanocomposite is dip coated on hydrophilic PVP substrate of 80 µm thickness. The material is characterized by using UV–Vis, TEM and FTIR techniques. UV–Vis and TEM analysis are complementary to each other for exhibiting dependence of particle size on preparation approach − 10 nm (in-situ) to 40 nm (ex-situ). Humidity sensing mechanism is explained on the basis of FTIR spectra. Co-ordination between tertiary nitrogen ( ) and C=O group with nAg particles during nanocomposite formation is evidenced from low humidity FTIR. Breaking of these bonds is evidenced from high humidity FTIR. In/PVP/6-PVP sensors offer higher sensitivity (~ 0.68 ± 0.04 (1/% RH)) as compared to Ex/PVP/4:5-PVP sensors [~ 0.31 ± 0.04 (1/% RH)]. 1 Introduction the arrangement is more complex and some lack in long term stability [8]. In addition to the above limitations, all the Monitoring and controlling of humidity is important due to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science: Materials in Electronics Springer Journals

Optical humidity sensor based on in situ and ex situ synthesized nAg/0.1%PVP composite coated on self supported PVP substrate

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials
ISSN
0957-4522
eISSN
1573-482X
D.O.I.
10.1007/s10854-018-9370-z
Publisher site
See Article on Publisher Site

Abstract

An optical based humidity sensor having linear response (R = 0.99) over a wide range (06–94%RH) and high sensitiv- ity is reported using nAg/0.1%PVP nanocomposite. Nanocomposite is prepared using in-situ and ex-situ approaches by chemical reduction method with silver salt (A gNO ) as precursor, tri sodium citrate as reducing agent and PVP as capping agent. The nanocomposite is dip coated on hydrophilic PVP substrate of 80 µm thickness. The material is characterized by using UV–Vis, TEM and FTIR techniques. UV–Vis and TEM analysis are complementary to each other for exhibiting dependence of particle size on preparation approach − 10 nm (in-situ) to 40 nm (ex-situ). Humidity sensing mechanism is explained on the basis of FTIR spectra. Co-ordination between tertiary nitrogen ( ) and C=O group with nAg particles during nanocomposite formation is evidenced from low humidity FTIR. Breaking of these bonds is evidenced from high humidity FTIR. In/PVP/6-PVP sensors offer higher sensitivity (~ 0.68 ± 0.04 (1/% RH)) as compared to Ex/PVP/4:5-PVP sensors [~ 0.31 ± 0.04 (1/% RH)]. 1 Introduction the arrangement is more complex and some lack in long term stability [8]. In addition to the above limitations, all the Monitoring and controlling of humidity is important due to

Journal

Journal of Materials Science: Materials in ElectronicsSpringer Journals

Published: Jun 2, 2018

References

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