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Here, a novel, cost\u2010effective granular\u2010based TENG comprising two electrodes covered with HCP monolayers of monodisperse polymer (PMMA, PS, and MF\u2010resin) beads with diameters ranging between 0.5 and 10 \u00b5m\u00a0is proposed. These monolayers are attained in &lt;20\u00a0s by employing a solvent\u2010free particle rubbing assembly technique on fluorocarbon\u2010coated substrates. The performance of the proposed granular\u2010based TENG is characterized using contact\u2010separation (CS) experiments by changing the bead sizes (topography effects) and the polymer material (mechanical properties). These findings show that when identical polymer material is utilized, large beads charged negatively, and the small beads positively, coinciding with bulk polymer film reports. In addition, the MF particles always charge positively and show the highest charging due to their relatively higher Young's modulus. The results elucidate that a specific pair's surface charge density is enhanced when one of the electrodes is covered with the smaller bead with the highest Young's modulus, highlighting that mechanical properties dominate and that a substantial difference in size benefits the output. The stable performance of the TENG devices after 10\u2009000 cycles corroborates its robustness.<\/jats:p>","DOI":"10.1002\/smll.202410155","type":"journal-article","created":{"date-parts":[[2025,2,6]],"date-time":"2025-02-06T01:51:01Z","timestamp":1738806661000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Granular Interfaces in TENGs: The Role of Close\u2010Packed Polymer Bead Monolayers for Energy Harvesters"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9653-1938","authenticated-orcid":false,"given":"Ignaas S. M.","family":"Jimidar","sequence":"first","affiliation":[{"name":"Department of Chemical Engineering CHIS Vrije Universiteit Brussel  Brussels 1050 Belgium"},{"name":"Mesoscale Chemical Systems, MESA+ Institute University of Twente  P.O. Box 217 Enschede 7500AE The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaspars","family":"M\u0101lnieks","sequence":"additional","affiliation":[{"name":"Institute of Materials and Surface Engineering Faculty of Materials Science and Applied Chemistry Riga Technical University  Riga LV\u20101048 Latvia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2073-6958","authenticated-orcid":false,"given":"Kai","family":"Sotthewes","sequence":"additional","affiliation":[{"name":"Physics of Interfaces and Nanomaterials, MESA+ Institute University of Twente  P.O. Box 217 Enschede 7500AE The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4644-6238","authenticated-orcid":false,"given":"Peter C.","family":"Sherrell","sequence":"additional","affiliation":[{"name":"Applied Chemistry &amp; Environmental Science School of Science RMIT University  124 La Trobe St Melbourne 3000 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andris","family":"\u0160utka","sequence":"additional","affiliation":[{"name":"Institute of Materials and Surface Engineering Faculty of Materials Science and Applied Chemistry Riga Technical University  Riga LV\u20101048 Latvia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,5]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202203849"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202308469"},{"key":"e_1_2_9_3_1","author":"Li Z.","year":"2024","journal-title":"Int. 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