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• W2306261305 abstract "O estudo da adsorcao de moleculas orgânicas em superficies condutoras tem sido de grande interesse nos ultimos tempos, pois com o entendimento do seu mecanismo e das variaveis envolvidas para tal, espera-se poder controlar o posicionamento molecular. Este controle teria o seu uso em uma possivel construcao de nanoestruturas de camadas auto-montadas de aplicacao na nanotecnologia. O estudo da adsorcao da Timina (5-metiluracil; 5MU) foi efetuado via Surface Enhanced Raman Spectroscopy (SERS) com variacao a variacao de pH e com controle de potencial. A analise dos espectros levou a conlusao de que a concentracao de H+ no meio leva a protonacao/desprotonacao da molecula fazendo com que esta se reposicione. Foram obtidos dois padroes de espectros para a Ag em meio acido. As mudancas nas intensidades das bandas dos espectros levaram a propor um modelo em que a timina para potenciais mais baixos (molecula protonada) se adsorve inclinadamente por um dos oxigenios do anel e com o aumento para potenciais mais altos (agora desprotonada) a adsorcao ocorre por um dos nitrogenios, levando a molecula a uma posicao mais proxima da perpendicular a superficie. Para o meio neutro os espectros foram semelhantes aqueles da forma deprotonada indicando que nao houve reposicionamento molecular uma vez que os espectros nao variaram com potencial. Palavras-chave: Adsorcao, timina, SERS. The study of the adsorption of organic molecules on metallic surfaces has received attention in the last years. This interest is partly due to the goal of constructing nanostructures where the molecular spacking structure is carefully controlled. The study of Thymine (5-methyl uracil – 5MU) was performed through the use of Surface Enhanced Raman Spectroscopy (SERS) at several pHs and with surface potential modulation. The spectra analysis indicated that the H+ concentration in the solution induces a protonation/deprotonation equilibrium controlling therefore the molecular orientation on the surface. Two kinds of spectra were obtained for an acidic medium. At more negative potentials the protonated form of the molecule is adsorbed though one of the Oxygen atoms whereas at more positive potentials, the deprotonated form of the molecule tilts upward and adsorbs though one of the Nitrogen atoms. In neutral solutions the molecule is constantly deprotonated and it is verified that the SER spectra does not change with surface potential" @default.
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• W2306261305 date "2005-01-01" @default.
• W2306261305 modified "2023-09-23" @default.
• W2306261305 title "Adsorção da Timina em Ag: Estudo da Influência do pH via SERS (Thymine adsorption on Ag: pH influence as probed by SERS itle)" @default.
• W2306261305 hasPublicationYear "2005" @default.
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