Optimization Strategies for Responsivity Control of Microgel Assisted Lab-On-Fiber Optrodes(136 visite)(PDF pubblico123 visite) Giaquinto M, Micco A, Aliberti A, Bobeico E, La Ferrara V, Ruvo M, Ricciardi A, Cusano A
*** IBB - CNR *** Optoelectronics Group, Department of Engineering, University of Sannio, I-82100 Benevento, Italy. martino.giaquinto@unisannio.it. ENEA, Portici Research Center, P. le E. Fermi 1, Portici, I-80055 Napoli, Italy. eugenia.bobeico@enea.it. Institute of Biostructure and Bioimaging, National Research Council, I-80143 Napoli, Italy. menotti.ruvo@unina.it.
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Integrating multi-responsive polymers such as microgels onto optical <br>fiber tips, in a controlled fashion, enables unprecedented <br>functionalities to Lab-on-fiber optrodes. The creation of a uniform <br>microgel monolayer with a specific coverage factor is crucial for <br>enhancing the probes responsivity to a pre-defined target parameter. <br>Here we report a reliable fabrication strategy, based on the dip coating<br> technique, for the controlled realization of microgel monolayer onto <br>unconventional substrates, such as the optical fiber tip. The latter was<br> previously covered by a plasmonic nanostructure to make it sensitive to<br> superficial environment changes. Microgels have been prepared using <br>specific Poly(<i>N</i>-isopropylacrylamide)-based monomers that enable <br>bulky size changes in response to both temperature and pH variations. <br>The formation of the microgel monolayer is efficiently controlled <br>through the selection of suitable operating pH, temperature and <br>concentration of particle dispersions used during the dipping procedure.<br> The effect of each parameter has been evaluated, and the validity of <br>our procedure is confirmed by means of both morphological and optical <br>characterizations. We demonstrate that when the coverage factor exceeds <br>90%, the probe responsivity to microgels swelling/collapsing is <br>significantly improved. Our study opens new paradigms for the <br>development of engineered microgels assisted Lab-on-Fiber probes for <br>biochemical applications.
5 Records (3 escludendo Abstract e Conferenze). Impact factor totale: 7.555 (6.597 escludendo Abstract e Conferenze). Impact factor a 5 anni totale: 8.47 (7.623 escludendo Abstract e Conferenze).
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