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Doctoral Thesis
DOI
https://doi.org/10.11606/T.46.2013.tde-05082013-134912
Document
Author
Full name
Manuel Fernando Gonzalez Huila
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Toma, Henrique Eisi (President)
Anaíssi, Fauze Jacó
Camargo, Pedro Henrique Cury
Constantino, Vera Regina Leopoldo
Oliveira, Herenilton Paulino
Title in Portuguese
Xerogel de pentóxido de vanádio: novas abordagens na caracterização e aplicações
Keywords in Portuguese
Espectroscopia Raman
Litografia laser
Microscopia Raman confocal
Pentóxido de vanádio
Sensores de gases
Abstract in Portuguese
Um estudo refinado dos filmes derivados do gel de pentóxido de vanádio foi realizado por meio de técnicas espectroscópicas e microscópicas visando compreender melhor as características deste material na escala microscópica. Foi demonstrado que o gel de pentóxido de vanádio é uma suspensão de nanopartículas anisotrópicas que se mantêm estáveis mesmo em altas concentrações. As propriedades estruturais e espectroscópicas destas nanopartículas foram revistas e discutidas no estado da arte. Em paralelo foi possível investigar fenômenos como a transição de fase induzida por laser e desenvolver aplicações tecnológicas em áreas como litografia e sensoriamento de gases. Ficou destacada nesta tese o grande potencial de investigação da microscopia Raman confocal na área de nanomateriais.
Title in English
Vanadium pentoxide: new insights in their characterization and applications
Keywords in English
Confocal Raman microscopy
Gas sensors
Laser lithography
Raman spectroscopy
Vanadium pentoxide
Abstract in English
A refined study of films derived from vanadium pentoxide gel was carried out based on spectroscopic and microscopic techniques, aiming a better understanding of this material on a microscopic scale. It was demonstrated that the vanadium pentoxide gel consists of a suspension of anisotropic nanoparticles which remains stable even at high concentrations. The structural and spectroscopic properties of such nanoparticles were reviewed and discussed, providing new insights at the state of the art. It was also investigated the occurrence of some relevant phenomena, such as the laser induced phase transition, and to develop new technological applications in areas such as gas sensing and lithography. The collection of results described in thesis highlighted a great research potential of confocal Raman microscopy, in the field of nanomaterials.
 
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Publishing Date
2013-09-09
 
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