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Herein, facile and environmentally benign production of highly antibacterial carbonaceous nanomaterials from <jats:italic>Colocasia esculenta<\/jats:italic> and <jats:italic>Nelumbo nucifera<\/jats:italic> leaves is reported. After carbonization and oxidative treatment, smaller graphene domains are formed in <jats:italic>Colocasia esculenta<\/jats:italic> derivatives, whereas larger sheetlike structures are observed in the case of <jats:italic>Nelumbo nucifera<\/jats:italic>. Smaller particle size makes quantum confinement effects more prominent, as is evident in fine\u2010tuning of the photoluminescence emission after each stage of treatment. The influence of precursor materials on the antibacterial properties of the nanosystems is also demonstrated. When microbiocidal activity was tested against model bacteria <jats:italic>Pseudomonas aeruginosa<\/jats:italic>, the nanocomposite derived from <jats:italic>Colocasia esculenta<\/jats:italic> leaves showed higher activity than the antibiotic drug clarithromycin (control) with a measured zone of inhibition of 40\u00b10.5\u2005mm. This is one of the highest values reported in comparison with plant\u2010based carbon\u2013silver nanosystems. Quantitative analysis revealed that the nanocomposite obtained from <jats:italic>Colocasia esculenta<\/jats:italic> leaves has antimicrobial efficacy equivalent to those of commercial antibiotic drugs and is able to eradicate bacteria at much lower concentrations than that obtained from <jats:italic>Nelumbo nucifera<\/jats:italic> leaves.<\/jats:p>","DOI":"10.1002\/chem.202000590","type":"journal-article","created":{"date-parts":[[2020,3,28]],"date-time":"2020-03-28T07:45:32Z","timestamp":1585381532000},"page":"8105-8114","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Extraction of Graphene Nanostructures from <i>Colocasia esculenta<\/i> and <i>Nelumbo nucifera<\/i> Leaves and Surface Functionalization with Tin Oxide: Evaluation of Their Antibacterial Properties"],"prefix":"10.1002","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9293-8677","authenticated-orcid":false,"given":"Anu N.","family":"Mohan","sequence":"first","affiliation":[{"name":"Materials Science Research Laboratory Department of Physics and Electronics CHRIST (Deemed to be University)  Bengaluru Karnataka 560029 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3840-9229","authenticated-orcid":false,"given":"Manoj","family":".B","sequence":"additional","affiliation":[{"name":"Materials Science Research Laboratory Department of Physics and Electronics CHRIST (Deemed to be University)  Bengaluru Karnataka 560029 India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,6,3]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.carbon.2018.04.018"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.carbon.2016.04.046"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.msec.2016.12.125"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0185324"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/nn501640q"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.colsurfb.2013.05.022"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.addr.2016.04.009"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6NR08733G"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/nn202451x"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.201202455"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.4028\/www.scientific.net\/JNanoR.37.74"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.actbio.2012.03.002"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.saa.2014.06.131"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.mssp.2012.12.030"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11051-006-9150-1"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.powtec.2014.10.034"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/0040-6090(82)90382-0"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1039\/b007687m"},{"key":"e_1_2_7_19_1","first-page":"19","volume":"7","author":"Winship K. 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