Chatchawal WongchoosukKittitat SubannajuiChunyu WangYang YangFirat GüderTeerakiat KerdcharoenVolker CimallaMargit ZachariasKasetsart UniversityUniversitat Freiburg im BreisgauMahidol UniversityFraunhofer Institute for Applied Solid State Physics IAFNanjing Tech UniversityHarvard University2018-11-092018-11-092014-01-01RSC Advances. Vol.4, No.66 (2014), 35084-35088204620692-s2.0-84906536022https://repository.li.mahidol.ac.th/handle/123456789/33605A novel fabrication of microelectronic nose based on ZnO nanowires and ZnO surface modifications including ZnO-ZnAl2O4 core-shell nanowires and ZnO-Zn2TiO4 core-shell nanowires gas-sensing elements operated at room temperature is reported. By combining vapor-phase transport processes and atomic layer deposition techniques, highly homogeneous core-shell nanowires structures can be successfully obtained on large scale areas. Under ultraviolet illumination of the specific oxide surfaces, photo-stimulated oxygen species (O2-(ads)) respond to and dominate the gas sensing mechanism of the core-shell nanowires at room temperature. Principal component analysis results show the perfect discrimination of gases including toxic gases and non-toxic gases. This novel device can be used to identify both gas types with concentrations in the ppb level at room temperature. © 2014 the Partner Organisations.Mahidol UniversityChemical EngineeringChemistryArticleSCOPUS10.1039/c4ra06143h