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Herein, metal oxide nanoparticles (CoAl\n                    <jats:sub>x<\/jats:sub>\n                    O\n                    <jats:sub>y<\/jats:sub>\n                    ) using cobalt and aluminum were synthesized, and their structure, morphology, and chemical composition were investigated using various characterization techniques. The biMO\u2010NPs, which had a Gaussian\u2010type size distribution (\u223c6\u00a0nm), were assembled on plain silicon substrates modified chemically with linker molecules bearing suitable end groups. Surface analysis revealed an ordered, uniform, close\u2010packed arrangement of biMO\u2010NPs forming a monolayer architecture with nanoscale thickness (\u223c12\u00a0nm), high surface uniformity, and negligible defects. The nanoparticle monolayer film (NP\u2010MF) was employed as a catalyst to grow carbon nanotube (CNT) forests via the thermal chemical vapor deposition (CVD) method, similar to those grown from catalyst thin films deposited by physical vapor deposition. Structural characterization confirmed the growth of a dense, uniform, high\u2010quality vertically aligned carbon nanotube (VA\u2010CNT) forest with a length of \u223c125\u00a0\u00b5m, which is comparable to the VA\u2010CNTs grown from expensive thin films. Thus, CNT growth was successfully catalyzed by the biMO\u2010NPs, highlighting a simple and inexpensive alternative for catalyst deposition. In this innovative wet\u2010chemistry approach, the catalyst and catalyst support are combined within a single nanoparticle before NP\u2010MF assembly. Interestingly, this approach provides a scalable and cost\u2010effective pathway for CNT growth, eliminating the need for expensive thin deposition techniques.\n                  <\/jats:p>","DOI":"10.1002\/smll.74422","type":"journal-article","created":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T13:44:13Z","timestamp":1783691053000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Monolayer Films of Binary Metal Oxide Nanoparticles for Carbon Nanotube Synthesis"],"prefix":"10.1002","volume":"22","author":[{"given":"Bishow","family":"Regmi","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Cincinnati  Cincinnati Ohio USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ireshika","family":"Wickramasuriya","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Kentucky  Lexington Kentucky USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ranga Teja","family":"Pidathala","sequence":"additional","affiliation":[{"name":"Mechanical Engineering University of Louisville  Louisville Kentucky USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaminda P.","family":"Nawarathne","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Cincinnati  Cincinnati Ohio USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdul","family":"Hoque","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Cincinnati  Cincinnati Ohio USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8147-1047","authenticated-orcid":false,"given":"Badri","family":"Narayanan","sequence":"additional","affiliation":[{"name":"Mechanical Engineering University of Louisville  Louisville Kentucky 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