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In this work, SERS substrates were produced on two different types of paper: a high porosity paper (Whatman no. 1); and a low porosity paper (commercially available office paper, Portucel Soporcel). Solutions containing spherical silver nanoparticles (AgNPs) and silver nanostars (AgNSs) were separately drop-casted on hydrophilic wells patterned on the papers. The porosity of the paper was found to play a determinant role on the AgNP and AgNS distribution along the paper fibres, with most of the nanoparticles being retained at the illuminated surface of the office paper substrate. The highest SERS enhancements were obtained for the office paper substrate, with deposited AgNSs. A limit of detection for rhodamine-6G as low as 11.4\u2009\u00b1\u20090.2\u2009pg could be achieved, with an analytical enhancement factor of \u224810<jats:sup>7<\/jats:sup> for this specific analyte. The well patterning technique allowed good signal uniformity (RSD of 1.7%). Besides, these SERS substrates remained stable after 5 weeks of storage (RSD of 7.3%). Paper-induced aggregation of AgNPs was found to be a viable alternative to the classical salt-induced aggregation, to obtain a highly sensitive SERS substrates.<\/jats:p>","DOI":"10.1038\/s41598-017-02484-8","type":"journal-article","created":{"date-parts":[[2017,5,23]],"date-time":"2017-05-23T09:30:11Z","timestamp":1495531811000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":104,"title":["Office paper decorated with silver nanostars - an alternative cost effective platform for trace analyte detection by SERS"],"prefix":"10.1038","volume":"7","author":[{"given":"Maria Jo\u00e3o","family":"Oliveira","sequence":"first","affiliation":[]},{"given":"Pedro","family":"Quaresma","sequence":"additional","affiliation":[]},{"given":"Miguel","family":"Peixoto de Almeida","sequence":"additional","affiliation":[]},{"given":"Andreia","family":"Ara\u00fajo","sequence":"additional","affiliation":[]},{"given":"Eul\u00e1lia","family":"Pereira","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4202-7047","authenticated-orcid":false,"given":"Elvira","family":"Fortunato","sequence":"additional","affiliation":[]},{"given":"Rodrigo","family":"Martins","sequence":"additional","affiliation":[]},{"given":"Ricardo","family":"Franco","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7350-649X","authenticated-orcid":false,"given":"Hugo","family":"\u00c1guas","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2017,5,30]]},"reference":[{"key":"2484_CR1","doi-asserted-by":"publisher","first-page":"4756","DOI":"10.1002\/anie.201205748","volume":"53","author":"S Schl\u00fccker","year":"2014","unstructured":"Schl\u00fccker, S. 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