{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T10:55:27Z","timestamp":1762253727346,"version":"build-2065373602"},"reference-count":49,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2021,3,4]],"date-time":"2021-03-04T00:00:00Z","timestamp":1614816000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UID\/EEA\/50014\/2019","UID\/FIS\/00068\/2019","PTDC\/FIS-NAN\/0909\/2014","Dete\u00e7\u00e3o de Estrog\u00e9nio- um Contaminante Emergente - em Corpos H\u00eddricos","SFRH\/BD\/135820\/2018","PD\/BD\/142767\/2018","M-ERA-NET2\/0002\/2016."],"award-info":[{"award-number":["UID\/EEA\/50014\/2019","UID\/FIS\/00068\/2019","PTDC\/FIS-NAN\/0909\/2014","Dete\u00e7\u00e3o de Estrog\u00e9nio- um Contaminante Emergente - em Corpos H\u00eddricos","SFRH\/BD\/135820\/2018","PD\/BD\/142767\/2018","M-ERA-NET2\/0002\/2016."]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Photonics"],"abstract":"<jats:p>Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI\/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 \u00b1 17 kJ\/mol. Therefore, it is possible to conclude that PEI\/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.<\/jats:p>","DOI":"10.3390\/photonics8030070","type":"journal-article","created":{"date-parts":[[2021,3,5]],"date-time":"2021-03-05T00:39:07Z","timestamp":1614904747000},"page":"70","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers\u2019 Stability"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4710-0693","authenticated-orcid":false,"given":"Maria","family":"Raposo","sequence":"first","affiliation":[{"name":"CEFITEC, Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3970-4155","authenticated-orcid":false,"given":"Carlota","family":"Xavier","sequence":"additional","affiliation":[{"name":"CEFITEC, Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0463-9894","authenticated-orcid":false,"given":"Catarina","family":"Monteiro","sequence":"additional","affiliation":[{"name":"INESC TEC\u2014Institute for Systems and Computer Engineering, Technology and Science, Rua do Campo Alegre 687, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7555-361X","authenticated-orcid":false,"given":"Susana","family":"Silva","sequence":"additional","affiliation":[{"name":"INESC TEC\u2014Institute for Systems and Computer Engineering, Technology and Science, Rua do Campo Alegre 687, 4169-007 Porto, Portugal"}]},{"given":"Orlando","family":"Fraz\u00e3o","sequence":"additional","affiliation":[{"name":"INESC TEC\u2014Institute for Systems and Computer Engineering, Technology and Science, Rua do Campo Alegre 687, 4169-007 Porto, Portugal"}]},{"given":"Paulo","family":"Zagalo","sequence":"additional","affiliation":[{"name":"CEFITEC, Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9665-7610","authenticated-orcid":false,"given":"Paulo Ant\u00f3nio","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"CEFITEC, Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,3,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1064","DOI":"10.1109\/JLT.0082.921915","article-title":"Fiber-optic sensing: A historical perspective","volume":"26","author":"Culshaw","year":"2008","journal-title":"J. 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