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So, GQDs\u2010DPA was applied as a simple fluorescent probe for facile metal ions recognition in standard solution. The proposed DPA\u2010GQD supported amino acids respond to Cu<jats:sup>2+<\/jats:sup>, V<jats:sup>5+<\/jats:sup>, and Fe<jats:sup>3+<\/jats:sup>, with high sensitivity. The intensity of the fluorescence histogram of this probe significantly diminished in exposure to metal ions such as Cu(II), V(V), and Fe(III). Moreover, a microfluidic paper\u2010based device (\u03bcPAD) was fabricated through a facile and cost\u2010effective protocol. Cu<jats:sup>2+<\/jats:sup>, V<jats:sup>5+<\/jats:sup>, and Fe<jats:sup>3+<\/jats:sup> can be selectively recognized by GQDs\u2010DPA using \u03bcPAD by naked eye. Also, GQDs\u2010DPA exhibits a linear response for the detection of ions in concentrations ranging from 0.01 to 1\u00a0ppm, with a low limit of quantification of 0.01\u2009ppm in standards samples. The boosted color uniformity, low instrumental needs of the stamp, and disposability of \u03bcPADs enable the application of the proposed device for commercial applications in environmental science and technology.<\/jats:p>","DOI":"10.1002\/jmr.2936","type":"journal-article","created":{"date-parts":[[2021,9,10]],"date-time":"2021-09-10T11:38:28Z","timestamp":1631273908000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Providing multicolor plasmonic patterns with graphene quantum dots functionalized d\u2010penicillamine for visual recognition of V(V), Cu (<scp>II<\/scp>), and Fe(<scp>III<\/scp>): Colorimetric fingerprints of GQDs\u2010DPA for discriminating ions in human urine samples"],"prefix":"10.1002","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9599-0558","authenticated-orcid":false,"given":"Parinaz","family":"Abdollahiyan","sequence":"first","affiliation":[{"name":"Jiangsu 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