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Colorimetric sensors, such as distributed Bragg reflectors made of polymers, could achieve this task thanks to their low cost and easy signal transduction but are typically affected by low vapor permeability and lack of selectivity without chemical labeling. Here we demonstrate all-polymer Bragg multilayers for label-free selective detection of organic volatile compounds. The system exploits the ability of amorphous poly(p-phenylene oxide), PPO, to uptake large amount of guest molecules and to form cocrystalline phases with distinct optical properties. Bragg stacks embedding PPO active layers show selective colorimetric response to vapors of carbon tetrachloride and aromatic homologues, which can be revealed by the naked eye.<\/jats:p>","DOI":"10.1021\/acsami.6b10809","type":"journal-article","created":{"date-parts":[[2016,11,3]],"date-time":"2016-11-03T09:40:57Z","timestamp":1478166057000},"page":"31941-31950","source":"Crossref","is-referenced-by-count":110,"title":["Label-Free\nVapor Selectivity in Poly(\n                    <i>p<\/i>\n                    -Phenylene Oxide)\nPhotonic Crystal Sensors"],"prefix":"10.1021","volume":"8","author":[{"given":"Paola","family":"Lova","sequence":"first","affiliation":[{"name":"Nanyang Technological University , ,","place":["Singapore, 639798"]},{"name":"Universita\u0300 degli Studi di Genova , , ,","place":["Genova, Italy, 16126"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chiara","family":"Bastianini","sequence":"additional","affiliation":[{"name":"Universita\u0300 degli Studi di Genova , , ,","place":["Genova, Italy, 16126"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paolo","family":"Giusto","sequence":"additional","affiliation":[{"name":"Universita\u0300 degli Studi di Genova , , ,","place":["Genova, Italy, 16126"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maddalena","family":"Patrini","sequence":"additional","affiliation":[{"name":"Universita\u0300 degli Studi di Pavia , , ,","place":["Pavia, Italy, 27100"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paola","family":"Rizzo","sequence":"additional","affiliation":[{"name":"Universita\u0300 di Salerno , , ,","place":["Salerno, Italy, 84084"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaetano","family":"Guerra","sequence":"additional","affiliation":[{"name":"Universita\u0300 di Salerno , , ,","place":["Salerno, Italy, 84084"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mario","family":"Iodice","sequence":"additional","affiliation":[{"name":"Consiglio Nazionale delle Ricerche , , ,","place":["Napoli, Italy, 95121"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cesare","family":"Soci","sequence":"additional","affiliation":[{"name":"Nanyang Technological University , ,","place":["Singapore, 637371"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Davide","family":"Comoretto","sequence":"additional","affiliation":[{"name":"Universita\u0300 degli Studi di Genova , , ,","place":["Genova, Italy, 16126"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2016,11,3]]},"reference":[{"key":"2026090300430098500_cit1","doi-asserted-by":"publisher","first-page":"57","DOI":"10.1016\/S0013-9351(03)00035-5","article-title":"Risk Assessment\nof Exposure to Volatile Organic Compounds in Different Indoor Environments","volume":"94","author":"Guo","year":"2004","journal-title":"Environ. 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