Ultrasensitive detection of xylene gas by cauliflower-like Au-TiO2 core-shell nanoparticles
Kim, Hyeong Min (Hanyang University. Division of Materials Science and Engineering)
Shin, Ka Yoon (Hanyang University. Division of Materials Science and Engineering)
Mirzaei, Ali (Shiraz University of Technology. Department of Materials Science and Engineering)
Oum, Wansik (Hanyang University. Division of Materials Science and Engineering)
Kim, Eun Bi (Hanyang University. Division of Materials Science and Engineering)
Moon, Sungjoon (Hanyang University. Division of Materials Science and Engineering)
Bharath, Somalapura Prakasha (Institut Català de Nanociència i Nanotecnologia)
Kim, Sang Sub (Inha University. Department of Materials Science and Engineering)
Kim, Hyoun Woo (Hanyang University. The Research Institute of Industrial Science)

Date:	2024
Abstract:	TiO2 nanoparticles (NPs) and Au-TiO2 core-shell NPs (C-S NPs) were synthesized for xylene gas detection. Morphological, phase, and chemical studies demonstrated the successful generation of Au-TiO2 C-S NPs with a cauliflower-like morphology and desired composition. Also, the surface area of TiO2 NPs was 8. 46, which increased to 23. 88 m2/g for Au-TiO2 C-S NPs, due to the creation of a porous TiO2 shell around the Au core. The response of the TiO2 NPs to 50 ppm xylene was 14. 19 at 500°C, while it increased to 165. 77 at a lower temperature (450°C). Furthermore, while the TiO2 NPs gas sensor has no selectivity to xylene gas, the TiO2 C-S NP gas sensor exhibited excellent selectivity. Overall, incorporation of Au in TiO2 in the form of a C-S structure improved the performance of the sensor to sense xylene. Improved xylene sensing for the TiO2 C-S NPs stemmed from the high surface area and porous nature, oxygen defects, and formation of Au-TiO2 Schottky barriers. This research demonstrates the development of high-output xylene sensors by means of Au-TiO2 with a C-S structure.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Xylene ; Au-TiO2 ; Core-shell ; Gas sensor ; Selectivity ; Sensing mechanism
Published in:	Sensors and Actuators B: Chemical, Vol. 412 (August 2024) , art. 135802, ISSN 0925-4005

DOI: 10.1016/j.snb.2024.135802

Available from: 2025-08-31 Postprint

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles