Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/7765
Title: Effect of chain topology on plasmonic properties of pressure sensor films based on poly(acrylamide) and Au nanoparticles
Authors: Topçu, Gökhan
Demir, Mustafa Muammer
Topçu, Gökhan
Demir, Mustafa Muammer
Izmir Institute of Technology. Materials Science and Engineering
Keywords: Gold nanoparticles
Plasmonic shift
Pressure sensor
Crosslinking
Disassembly
Issue Date: Aug-2019
Publisher: Elsevier Ltd.
Source: Topçu, G., and Demir, M. M. (2019). Effect of chain topology on plasmonic properties of pressure sensor films based on poly(acrylamide) and Au nanoparticles. Sensors and Actuators, A: Physical, 295, 237-243. doi:10.1016/j.sna.2019.06.009
Abstract: Au nanoparticles have been recognized as a colorimetric sensing element in polymeric systems because clustering shifts the red color of individual particles into saturated blue due to distinct plasmonic variation. The mechanism of pressure sensing is based on the disintegration of the particle clusters into the individual particles in polymers upon application of pressure. Polymers are usually composed of linear chains that provide a viscoelastic medium for their diffusion. Changing topology of polymer chains from linear to crosslinked under fixed pressure makes a clear change in spectral features of the particles probably due to the hindrance of particle diffusion by the crosslinking points. Therefore, the working range of the sensor films can be increased to higher-pressure values. In this work, polyacrylamide/Au nanoparticle films were prepared by various concentrations of formaldehyde as a crosslinking agent from 0.5 to 5.0 wt %. The initial absorption signal gradually shifts from 690 to 545 nm for linear chains upon application of pressure while shifting goes down to 571 nm for crosslinked ones. The colorimetric change is also examined under humid environments. Contrary to the crosslinking process, humid environment facilitates the diffusion of particles since the chains swell with water molecules that provide a convenient medium for particle diffusion.
URI: https://doi.org/10.1016/j.sna.2019.06.009
https://hdl.handle.net/11147/7765
ISSN: 0924-4247
0924-4247
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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