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We have used a colour recogniser application on a smartphone to register the gradual colour changes experimented, under <jats:italic>\u03bb<\/jats:italic>\n            <jats:sub>ex<\/jats:sub>\u2009=\u2009365\u00a0nm radiation, by a dansyl-based chemosensor immobilised on cellulose paper, after interacting with aqueous dispersions of CuO NPs with concentrations between 5 and 100\u00a0\u00b5g L<jats:sup>\u22121<\/jats:sup>. The low limits of detection (LOD) and quantification (LOQ) (10.5 and 34.9\u00a0\u00b5g L<jats:sup>\u22121<\/jats:sup>, respectively) show a relevant sensitivity for this simple method, which also displays a good precision and accuracy (analytical recovery, 99\u2009\u00b1\u20091%). A comparison of the results similarly obtained for the modified paper through diffuse reflectance (DR) revealed worse detection parameters (LOD\u2009=\u2009100.0\u00a0\u00b5g L<jats:sup>\u22121<\/jats:sup> and LOQ\u2009=\u2009333.4\u00a0\u00b5g L<jats:sup>\u22121<\/jats:sup>). In addition, fluorescence spectroscopy (<jats:italic>\u03bb<\/jats:italic>\n            <jats:sub>em<\/jats:sub>\u2009=\u2009520\u00a0nm) demonstrated the ability of the free chemosensor (1.26\u00a0\u00b5g L<jats:sup>\u22121<\/jats:sup> in 20:80 (v\/v) water\u2013ethanol solutions) for the quantification of CuO NPs (LOD\u2009=\u200930\u00a0\u00b5g L<jats:sup>\u22121<\/jats:sup> and LOQ\u2009=\u2009101\u00a0\u00b5g L<jats:sup>\u22121<\/jats:sup>), without improvement of the results obtained with DIC on the modified papers. The dissolved free chemosensor demonstrated selectivity towards CuO NPs in the presence both of metal ions common in aqueous samples as K<jats:sup>+<\/jats:sup>, Na<jats:sup>+<\/jats:sup>, Ca<jats:sup>2+<\/jats:sup>, Mg<jats:sup>2+<\/jats:sup>, Fe<jats:sup>3+<\/jats:sup>, or Al<jats:sup>3+<\/jats:sup> and of other usual nanomaterials as those of Cu, CdSe, TiO<jats:sub>2<\/jats:sub>, and ZnO NPs.<\/jats:p>\n          <jats:p>\n            <jats:bold>Graphical Abstract<\/jats:bold>\n          <\/jats:p>","DOI":"10.1007\/s00604-025-07439-9","type":"journal-article","created":{"date-parts":[[2025,8,16]],"date-time":"2025-08-16T00:50:57Z","timestamp":1755305457000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Convenient colorimetric approach to quantify CuO NPs in water using only a smartphone and cellulose paper with an immobilised chemosensor"],"prefix":"10.1007","volume":"192","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9971-4657","authenticated-orcid":false,"given":"Jes\u00fas","family":"Sanmart\u00edn-Matalobos","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5864-6144","authenticated-orcid":false,"given":"Pilar","family":"Bermejo-Barrera","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9127-0740","authenticated-orcid":false,"given":"Ana M.","family":"Garc\u00eda-Deibe","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7535-946X","authenticated-orcid":false,"given":"Matilde","family":"Fondo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1649-5701","authenticated-orcid":false,"given":"Yeneva","family":"Alves-Iglesias","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,8,16]]},"reference":[{"key":"7439_CR1","doi-asserted-by":"publisher","first-page":"133","DOI":"10.1016\/j.jphotobiol.2017.05.001","volume":"171","author":"V Gnanavel","year":"2017","unstructured":"Gnanavel V, Palanichamy V, Mohana Roopan S (2017) Biosynthesis and characterization of copper oxide nanoparticles and its anticancer activity on human colon cancer cell lines (HCT-116). 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