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Permanent link (DOI): https://doi.org/10.7939/R3K35MT1R

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Photothermally induced optical property changes of poly(N-isopropylacrylamide) microgel-based etalons Open Access

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Author or creator
Islam, Molla R.
Irvine, Jessica
Serpe, Michael J.
Additional contributors
Subject/Keyword
Poly(N-isopropylacrylamide) Microgels
Layer-By-Layer Assembly
Photothermal Effect
Light-Responsive Etalons
Responsive Polymers
Gold Nanoparticles
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Poly(N-isopropylacrylamide) microgel-based optical devices were designed such that they can be stimulated to change their optical properties in response to light produced by a light-emitting diode (LED). The devices were fabricated by sandwiching the synthesized microgels between two Cr/Au layers all supported on a glass coverslip with gold nanoparticles (AuNPs) deposited. Here, we found that these devices can be stimulated to change their optical properties when exposed to green LED light, which excites the AuNPs and increases the local temperature, causing the thermoresponsive microgels to decrease in diameter, resulting in a change in the devices’ optical properties. We also found that the sensitivity of the devices to light was more pronounced as the environmental temperature approached the lower critical solution temperature (LCST) for the microgels, although the sensitivity of the devices to light exposure dropped off dramatically as the environmental temperature was increased above the LCST. This was a direct result of the microgels already being in their collapsed state and therefore unable to decrease in diameter any further due to light exposure. Finally, we found that the sensitivity of the devices to light exposure increased with increasing number of AuNP layers in the devices. We anticipate that these devices could be used for drug delivery applications; by using light to stimulate microgel collapse, the microgel-based devices can be stimulated to release small molecules on demand.
Date created
2015
DOI
doi:10.7939/R3K35MT1R
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© 2015 Molla R. Islam et al. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Islam, M., Irvine, J., and Serpe, M. (2015). Photothermally induced optical property changes of poly(N-isopropylacrylamide) microgel-based etalons. ACS Applied Materials & Interfaces, 7(43), 24370-24376.
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