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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
22/12/1999 |
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Autoria: |
DHANABALAN, A.; RIUL JUNIOR, A.; OLIVEIRA JUNIOR, O. N.; MATTOSO, L. H. C. |
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Afiliação: |
USP-IFSC; EMBRAPA-CNPDIA. |
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Título: |
LB processing of 16-mer polyaniline. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 20., jun. 1997, Caxambu, MG. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1997. |
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Páginas: |
p. 331. |
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Idioma: |
Inglês |
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Conteúdo: |
Oligomeric organic conductors are expected to have higher crystallinity than their polymeric couterparts; consequently oligomers should display an increased interdomain conductivity thus enhancing their bulk conductivity when compared to conducting polymers. The interest in the study of ordered layers of this special class of materials arises from their large potential application in the field of molecular electronics. The Langmuir-Blodgett tecnique has been widely used for this purpose as it allows control over the molecular packing in the fabrication of highly ordered ultrathin organic films. In the present work, we report for the first time on the preparation and characterisation of composite Langmuir and Langmuir-Blodgett films of 16-mer polyaniline and cadmium stearate. The amount of these composite films has been varied systematically and the effect of composition on the monolayer stability and the multilayer transfer process has been studied. Composite monolayers were characterized by surface pressure and surface potential isotherms which basically indicate the de4crease of monolayyer stability with increasing 16-mer amount above 60% in the composite. The transfer process was also found to depend on the 16-mer content in the composite monolayer, with poor transfer above 60% of 16-mer. transferred filmswere characterized by UV-vis, FTIR, d.c. electrical conductivity and surface potential measurements. The observed linear increase of absorption corresponding to the 16-mer with increasing number of layers indicated a uniform transfer of the oligomer in the composite LB films. The results are compared with those obtained with the composite LB films of high molecular weight polyaniline and cadmium stearate. MenosOligomeric organic conductors are expected to have higher crystallinity than their polymeric couterparts; consequently oligomers should display an increased interdomain conductivity thus enhancing their bulk conductivity when compared to conducting polymers. The interest in the study of ordered layers of this special class of materials arises from their large potential application in the field of molecular electronics. The Langmuir-Blodgett tecnique has been widely used for this purpose as it allows control over the molecular packing in the fabrication of highly ordered ultrathin organic films. In the present work, we report for the first time on the preparation and characterisation of composite Langmuir and Langmuir-Blodgett films of 16-mer polyaniline and cadmium stearate. The amount of these composite films has been varied systematically and the effect of composition on the monolayer stability and the multilayer transfer process has been studied. Composite monolayers were characterized by surface pressure and surface potential isotherms which basically indicate the de4crease of monolayyer stability with increasing 16-mer amount above 60% in the composite. The transfer process was also found to depend on the 16-mer content in the composite monolayer, with poor transfer above 60% of 16-mer. transferred filmswere characterized by UV-vis, FTIR, d.c. electrical conductivity and surface potential measurements. The observed linear increase of absorption corresponding to the 16-m... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02271naa a2200169 a 4500
001 1027247
005 1999-12-22
008 1997 bl --- 0-- u #d
100 1 $aDHANABALAN, A.
245 $aLB processing of 16-mer polyaniline.
260 $c1997
300 $ap. 331.
520 $aOligomeric organic conductors are expected to have higher crystallinity than their polymeric couterparts; consequently oligomers should display an increased interdomain conductivity thus enhancing their bulk conductivity when compared to conducting polymers. The interest in the study of ordered layers of this special class of materials arises from their large potential application in the field of molecular electronics. The Langmuir-Blodgett tecnique has been widely used for this purpose as it allows control over the molecular packing in the fabrication of highly ordered ultrathin organic films. In the present work, we report for the first time on the preparation and characterisation of composite Langmuir and Langmuir-Blodgett films of 16-mer polyaniline and cadmium stearate. The amount of these composite films has been varied systematically and the effect of composition on the monolayer stability and the multilayer transfer process has been studied. Composite monolayers were characterized by surface pressure and surface potential isotherms which basically indicate the de4crease of monolayyer stability with increasing 16-mer amount above 60% in the composite. The transfer process was also found to depend on the 16-mer content in the composite monolayer, with poor transfer above 60% of 16-mer. transferred filmswere characterized by UV-vis, FTIR, d.c. electrical conductivity and surface potential measurements. The observed linear increase of absorption corresponding to the 16-mer with increasing number of layers indicated a uniform transfer of the oligomer in the composite LB films. The results are compared with those obtained with the composite LB films of high molecular weight polyaniline and cadmium stearate.
700 1 $aRIUL JUNIOR, A.
700 1 $aOLIVEIRA JUNIOR, O. N.
700 1 $aMATTOSO, L. H. C.
773 $tIn: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 20., jun. 1997, Caxambu, MG. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1997.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 34 | |
| 6. |  | TAKEDA, H. H.; FIRMINO, A.; RIUL JÚNIOR, A.; FONSECA, F. J.; MATTOSO, L. H. C. Língua eletrônica para diferenciação de paladares doce, salgado, azedo e amargo. In: SIMPÓSIO LATINO AMERICANO DE CIÊNCIA DE ALIMENTOS, 5. nov. 2003, Campinas, SP. [Resumos...] Campinas: UNICAMP, 2003. [CD-ROM].| Biblioteca(s): Embrapa Instrumentação. |
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| 10. | | OLIVEIRA JÚNIOR, O. N.; ZUCOLOTTO, V.; FERREIRA, M.; MATTOSO, L. H. C.; RIUL JÚNIOR, A. Nanostructured films employed in sensors. In: SUPRAMOLECULAR ENGINEERING OF CONDUCTING MATERIALS, 2005, Safety Harbor, USA. Capítulo de livro. Safety Harbor, USA: Fractal System, 2005.| Biblioteca(s): Embrapa Instrumentação. |
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| 14. | | RIUL JUNIOR, A.; DHANABALAN, A.; MATTOSO, L. H. C.; SOUZA, L. M. de; TICIANELLI, E. A.; OLIVEIRA JUNIOR, O. N. Characterization of 16-MER polyaniline composite LB films. In: INTERNATIONAL CONFERENCE ON ORGANIZED MOLECULAR FILMS, 8., aug. 1997, Asilomar, CA, USA. Abstract & program booklet... Davis: University of California, 1997. não paginado. Ref: 7-P-28.| Biblioteca(s): Embrapa Instrumentação. |
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| 15. | | RIUL JUNIOR, A.; OLIVEIRA JUNIOR, O. N.; TELLES, G. D.; MATTOSO, L. H. C.; FARIA, R. M. Characterization of Langmuir-Blodgett films of parent polyaniline. In: INTERNATIONAL CONFERENCE ON ORGANIZED MOLECULAR FILMS, 7., Sept. 1995, Numana, Ancona, Italia. Abstract book... [S.l.: s.n.], 1995. p.33. Ref.P-1.99.| Biblioteca(s): Embrapa Instrumentação. |
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| 17. | | MELLO, S. V.; RIUL JUNIOR, A.; MATTOSO, L. H. C.; FARIA, R. M.; OLIVEIRA JUNIOR, O. N. Protonation effects in polyaniline Langmuir films investigated by surface potential measurements. In: INTERNATIONAL CONFERENCE ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS, July-Aug. 1996, Snowbird, UT, Estados Unidos. Abstracts... Snowbird: Utah University, 1996. p.204. Ref.P2.164.| Biblioteca(s): Embrapa Instrumentação. |
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| 18. | | RIUL JUNIOR, A.; MELLO, S. V.; MATTOSO, L. H. C.; FARIA, R. M.; OLIVEIRA JUNIOR, O. N. Potencial de superfície de filmes de Langmuir de polianilinas. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 19., set. 1996, Aguas de Lindoia, SP. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1996. p. 462.| Biblioteca(s): Embrapa Instrumentação. |
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| 20. | | MATTOSO, L. H. C.; MELLO, S. V.; RIUL JÚNIOR, A.; TELLES, G. D.; OLIVEIRA JÚNIOR, O. N. Langmuir and Langmuir-blodgett films of parent polyaniline doped with functionalized acids. In: INTERNATIONAL CONFERENCE ON SCIENCE AND TECHONOLOGY OF SYNTHETIC METALS, jul. 1994, Seoul, Korea. Abstracts... Seoul, Korea: The Organizing Committee of ICSM '94, 1994. Ref. THR P83. 524| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 34 | |
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