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However, the number of isolated and characterized EAB species is still very limited regarding their abundance in nature. Colorimetric detection has emerged recently as an attractive mean for fast identification and characterization of analytes based on the use of electrochromic materials. In this work, WO<jats:sub>3<\/jats:sub> nanoparticles were synthesized by microwave assisted hydrothermal synthesis and used to impregnate non-treated regular office paper substrates. This allowed the production of a paper-based colorimetric sensor able to detect EAB in a simple, rapid, reliable, inexpensive and eco-friendly method. The developed platform was then tested with <jats:italic>Geobacter sulfurreducens<\/jats:italic>, as a proof of concept. <jats:italic>G. sulfurreducens<\/jats:italic> cells were detected at latent phase with an RGB ratio of 1.10 \u00b1 0.04 and a response time of two hours.<\/jats:p>","DOI":"10.1038\/srep09910","type":"journal-article","created":{"date-parts":[[2015,4,20]],"date-time":"2015-04-20T09:12:06Z","timestamp":1429521126000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":83,"title":["Office Paper Platform for Bioelectrochromic Detection of Electrochemically Active Bacteria using Tungsten Trioxide Nanoprobes"],"prefix":"10.1038","volume":"5","author":[{"given":"A. C.","family":"Marques","sequence":"first","affiliation":[]},{"given":"L.","family":"Santos","sequence":"additional","affiliation":[]},{"given":"M. N.","family":"Costa","sequence":"additional","affiliation":[]},{"given":"J. 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