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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Transition metal (Nb and W) doped TiO2 nanostructures: The role of metal doping in their photocatalytic activity and ozone gas-sensing performance

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Author(s):
Santos, Emerson [1] ; Catto, Ariadne C. [2, 1] ; Peterline, Allan F. [1] ; Avansi Jr, Waldir
Total Authors: 4
Affiliation:
[1] Univ Fed Sao Carlos, UFSCar, Lab Nanostruct Multifunct Mat, Dept Phys, BR-13565905 Sao Carlos - Brazil
[2] Univ Fed Sao Carlos, Ctr Dev Funct Mat CDMF, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Applied Surface Science; v. 579, MAR 30 2022.
Web of Science Citations: 0
Abstract

Semiconducting metal oxide nanostructures have drawn much attention from the researchers due to several advantages related to their wide-ranging applications, such as photocatalytic activity and gas-sensing performance. In this way, the effect of metal ions on the structural, morphological and electronic properties of the asprepared samples were investigated by X-ray diffraction (XRD), Raman spectroscopy, UV-visible diffuse reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS) and electron microscopy techniques. XRD analysis confirmed that all MxTi1\_xO2 (M = Nb and W) samples presented only the TiO2 anatase phase despite the different amounts of dopant. Additionally, scanning electron microscopy (SEM) showed that the increased metal ion content leads to a morphological evolution from anisotropic to isotropic nanostructures, which consequently reduces their size. It was observed that the presence of W and Nb as dopants clearly induces a change in the surface characteristics of the nanostructures, favoring the photodegradation of cationic dyes, which does not occur for Rhodamine (RhB) since the photocatalytic mechanism appears strictly related to carrier charges. From the studied samples, W0.29Ti0.71O2 presented interesting ozone (O3) gas-sensing performance, which was evidenced by their working temperature (below 150 degrees C), sensor response, stability and good range of detection. (AU)

FAPESP's process: 17/18649-4 - 2017 MRS Fall Meeting and Exhibit
Grantee:Waldir Avansi Junior
Support Opportunities: Research Grants - Meeting - Abroad
FAPESP's process: 18/18208-0 - a-Fe2O3/g-C3N4 Heterostructures: Preparation, Characterization and Gas-sensing Properties
Grantee:Ariadne Cristina Catto
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/12437-5 - Preparation and characterization of semiconductor nanoheterojunctions applied in photoactived gas sensors
Grantee:Luís Fernando da Silva
Support Opportunities: Regular Research Grants
FAPESP's process: 13/17639-4 - Obtainment of nanostructured semiconductors: correlation of the photocatalytic properties to their structural characteristic
Grantee:Waldir Avansi Junior
Support Opportunities: Regular Research Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC