{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T09:03:58Z","timestamp":1790154238520,"version":"4.0.1"},"reference-count":102,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"PROSNI (Programa de Apoyo a la Mejora en las Condiciones de Producci\u00f3n de los Miembros del SNI y SNCA), Universidad de Gaudalajara"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>TiO2\u2013carbon nanotube (TiO2\u2013CNT) hybrids are promising gas-sensor platforms because they combine the chemically active and photoresponsive surface of TiO2 with the high conductivity and interfacial sensitivity of CNT networks. Yet cross-study comparison remains difficult because materials, device architectures, humidity, activation modes, and response definitions vary widely. This comprehensive review connects interfacial mechanisms and architectures with performance benchmarking and design rules. Direct gas-sensing evidence is distinguished from supporting interfacial studies and contextual analogues. We assess band alignment, oxygen vacancies, CNT functionalization, shell thickness, percolation, photoactivation, humidity, and analyte-specific behavior across NOx, NH3, H2, H2S, VOCs, LPG, O2, and humidity sensing. The evidence shows that response is governed more strongly by interface continuity, spatial location, and the dominant current pathway than by nominal composition alone. Thin conformal coatings, discrete oxide decoration, and interpenetrating networks can each be advantageous; none is universally superior. Because response definitions and protocols remain inconsistent, we propose a benchmarking framework separating response magnitude from sensitivity, kinetics, selectivity, stability, humidity robustness, and activation requirements. These relationships yield practical design rules for controlling receptor chemistry, interface quality, percolation, activation energy, and validation conditions, providing a route from proof-of-concept demonstrations toward reproducible, low-power, application-relevant TiO2\u2013CNT gas sensors.<\/jats:p>","DOI":"10.3390\/s26196009","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T08:14:39Z","timestamp":1790151279000},"page":"6009","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["TiO2\u2013Carbon Nanotube Hybrid Gas Sensors: From Interfacial Mechanisms and Architectures to Performance Benchmarking and Design Rules"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3554-3710","authenticated-orcid":false,"given":"Marciano S\u00e1nchez","family":"Tizapa","sequence":"first","affiliation":[{"name":"Departamento de Ciencias Naturales y Exactas, Centro Universitario de los Valles, Universidad de Guadalajara, Carretera Guadalajara\u2013Ameca Km 45.5, Ameca C.P. 46600, Jalisco, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miriam Tostado","family":"Plascencia","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Naturales y Exactas, Centro Universitario de los Valles, Universidad de Guadalajara, Carretera Guadalajara\u2013Ameca Km 45.5, Ameca C.P. 46600, Jalisco, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alejandra","family":"Carreon-Alvarez","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Naturales y Exactas, Centro Universitario de los Valles, Universidad de Guadalajara, Carretera Guadalajara\u2013Ameca Km 45.5, Ameca C.P. 46600, Jalisco, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0685-9468","authenticated-orcid":false,"given":"H\u00e9ctor Huerta","family":"\u00c1vila","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Computacionales e Ingenier\u00edas, Centro Universitario de los Valles, Universidad de Guadalajara, Carretera Guadalajara\u2013Ameca Km 45.5, Ameca C.P. 46600, Jalisco, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roc\u00edo Casta\u00f1eda","family":"Valderrama","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Naturales y Exactas, Centro Universitario de los Valles, Universidad de Guadalajara, Carretera Guadalajara\u2013Ameca Km 45.5, Ameca C.P. 46600, Jalisco, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"10131","DOI":"10.1021\/cr400625j","article-title":"Titanium Dioxide Nanomaterials for Sensor Applications","volume":"114","author":"Bai","year":"2014","journal-title":"Chem. 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