Depth profiles of fullerene in ion irradiated polyimide
Identifieur interne : 001041 ( Istex/Corpus ); précédent : 001040; suivant : 001042Depth profiles of fullerene in ion irradiated polyimide
Auteurs : D. Fink ; R. Klett ; C. Mathis ; J. Vacik ; V. Hnatowicz ; L. T. ChaddertonSource :
- Nuclear Inst. and Methods in Physics Research, B [ 0168-583X ] ; 1995.
English descriptors
- KwdEn :
- Chadderton, Concentration profiles, Depth distribution, Depth distributions, Depth profiles, Dopant, Doped, Doping, Energetic ions, Energy transfer, Fink, Fullerene, Fullerene doping, Fullerene mobility, Fullerene molecule, Fullerene molecules, Fullerene production, Fullerene tracer, Hnatowicz, Instr, Intrinsic defects, Ion, Lithium, Meth, Neutron, Neutron depth, Nucl, Other hand, Phys, Polyimide, Polymer, Radiat, Room temperature, Total amount, Total amounts, Tracer, Tracer distributions, Track doping, Undoped, Undoped samples, Unsaturable traps, Whilst.
- Teeft :
- Chadderton, Concentration profiles, Depth distribution, Depth distributions, Depth profiles, Dopant, Doped, Doping, Energetic ions, Energy transfer, Fink, Fullerene, Fullerene doping, Fullerene mobility, Fullerene molecule, Fullerene molecules, Fullerene production, Fullerene tracer, Hnatowicz, Instr, Intrinsic defects, Ion, Lithium, Meth, Neutron, Neutron depth, Nucl, Other hand, Phys, Polyimide, Polymer, Radiat, Room temperature, Total amount, Total amounts, Tracer, Tracer distributions, Track doping, Undoped, Undoped samples, Unsaturable traps, Whilst.
Abstract
Abstract: An analytical experimental technique is described which permits depth profiles of the fundamental molecule fullerene, C60, to be determined in solids for low molecular concentrations. The method combines a procedure for the simultaneous marking and immobilizing of fullerene in organic solids, by means of lithium salt formation, with “neutron depth profiling” — a highly sensitive approach in determining specific depth distributions of 6Li. The new technique — fullerene tracer profiling (FTP) — is described in some detail, and results of the first experiments are discussed. Fullerene solutions have been introduced into both pristine and ion-irradiated samples of the polymer polyimide (PI). The C60 depth distributions were then measured using fullerene tracer profiling. From the shapes of the depth distributions conclusions are drawn concerning the uptake of fullerene solutions by polymers and the mobility of fullerene. Fullerene does not penetrate unirradiated PI, but it does readily fill up latent tracks of energetic ions in this polymer. Depending on the specific ion track density, some 104 to 107 C60 molecules can be identified as being present in a single track. The diffusion coefficient for C60 is estimated to be at least 2 × 10−12 to 2 × 10−13 cm2s−1, much higher than expected. This may be ascribed in part to the remarkable elastic deformability of the fullerene molecule in both kinetic and dynamic motion, and to the near perfect spherical geometry accompanying elimination of dangling bonds in simultaneously minimising the surface energy.
Url:
DOI: 10.1016/0168-583X(95)00185-9
Links to Exploration step
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<front><div type="abstract" xml:lang="en">Abstract: An analytical experimental technique is described which permits depth profiles of the fundamental molecule fullerene, C60, to be determined in solids for low molecular concentrations. The method combines a procedure for the simultaneous marking and immobilizing of fullerene in organic solids, by means of lithium salt formation, with “neutron depth profiling” — a highly sensitive approach in determining specific depth distributions of 6Li. The new technique — fullerene tracer profiling (FTP) — is described in some detail, and results of the first experiments are discussed. Fullerene solutions have been introduced into both pristine and ion-irradiated samples of the polymer polyimide (PI). The C60 depth distributions were then measured using fullerene tracer profiling. From the shapes of the depth distributions conclusions are drawn concerning the uptake of fullerene solutions by polymers and the mobility of fullerene. Fullerene does not penetrate unirradiated PI, but it does readily fill up latent tracks of energetic ions in this polymer. Depending on the specific ion track density, some 104 to 107 C60 molecules can be identified as being present in a single track. The diffusion coefficient for C60 is estimated to be at least 2 × 10−12 to 2 × 10−13 cm2s−1, much higher than expected. This may be ascribed in part to the remarkable elastic deformability of the fullerene molecule in both kinetic and dynamic motion, and to the near perfect spherical geometry accompanying elimination of dangling bonds in simultaneously minimising the surface energy.</div>
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<abstract xml:lang="en"><p>An analytical experimental technique is described which permits depth profiles of the fundamental molecule fullerene, C60, to be determined in solids for low molecular concentrations. The method combines a procedure for the simultaneous marking and immobilizing of fullerene in organic solids, by means of lithium salt formation, with “neutron depth profiling” — a highly sensitive approach in determining specific depth distributions of 6Li. The new technique — fullerene tracer profiling (FTP) — is described in some detail, and results of the first experiments are discussed. Fullerene solutions have been introduced into both pristine and ion-irradiated samples of the polymer polyimide (PI). The C60 depth distributions were then measured using fullerene tracer profiling. From the shapes of the depth distributions conclusions are drawn concerning the uptake of fullerene solutions by polymers and the mobility of fullerene. Fullerene does not penetrate unirradiated PI, but it does readily fill up latent tracks of energetic ions in this polymer. Depending on the specific ion track density, some 104 to 107 C60 molecules can be identified as being present in a single track. The diffusion coefficient for C60 is estimated to be at least 2 × 10−12 to 2 × 10−13 cm2s−1, much higher than expected. This may be ascribed in part to the remarkable elastic deformability of the fullerene molecule in both kinetic and dynamic motion, and to the near perfect spherical geometry accompanying elimination of dangling bonds in simultaneously minimising the surface energy.</p>
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<head><ce:title>Depth profiles of fullerene in ion irradiated polyimide</ce:title>
<ce:author-group><ce:author><ce:given-name>D.</ce:given-name>
<ce:surname>Fink</ce:surname>
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<ce:surname>Hnatowicz</ce:surname>
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<ce:abstract><ce:section-title>Abstract</ce:section-title>
<ce:abstract-sec><ce:simple-para>An analytical experimental technique is described which permits depth profiles of the fundamental molecule fullerene, C<ce:inf>60</ce:inf>
, to be determined in solids for low molecular concentrations. The method combines a procedure for the simultaneous marking and immobilizing of fullerene in organic solids, by means of lithium salt formation, with “neutron depth profiling” — a highly sensitive approach in determining specific depth distributions of <ce:sup loc="pre">6</ce:sup>
Li. The new technique — fullerene tracer profiling (FTP) — is described in some detail, and results of the first experiments are discussed.</ce:simple-para>
<ce:simple-para>Fullerene solutions have been introduced into both pristine and ion-irradiated samples of the polymer polyimide (PI). The C<ce:inf>60</ce:inf>
depth distributions were then measured using fullerene tracer profiling. From the shapes of the depth distributions conclusions are drawn concerning the uptake of fullerene solutions by polymers and the mobility of fullerene.</ce:simple-para>
<ce:simple-para>Fullerene does not penetrate unirradiated PI, but it does readily fill up latent tracks of energetic ions in this polymer. Depending on the specific ion track density, some 10<ce:sup>4</ce:sup>
to 10<ce:sup>7</ce:sup>
C<ce:inf>60</ce:inf>
molecules can be identified as being present in a single track. The diffusion coefficient for C<ce:inf>60</ce:inf>
is estimated to be at least 2 × 10<ce:sup>−12</ce:sup>
to 2 × 10<ce:sup>−13</ce:sup>
cm<ce:sup>2</ce:sup>
s<ce:sup>−1</ce:sup>
, much higher than expected. This may be ascribed in part to the remarkable elastic deformability of the fullerene molecule in both kinetic and dynamic motion, and to the near perfect spherical geometry accompanying elimination of dangling bonds in simultaneously minimising the surface energy.</ce:simple-para>
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<abstract lang="en">Abstract: An analytical experimental technique is described which permits depth profiles of the fundamental molecule fullerene, C60, to be determined in solids for low molecular concentrations. The method combines a procedure for the simultaneous marking and immobilizing of fullerene in organic solids, by means of lithium salt formation, with “neutron depth profiling” — a highly sensitive approach in determining specific depth distributions of 6Li. The new technique — fullerene tracer profiling (FTP) — is described in some detail, and results of the first experiments are discussed. Fullerene solutions have been introduced into both pristine and ion-irradiated samples of the polymer polyimide (PI). The C60 depth distributions were then measured using fullerene tracer profiling. From the shapes of the depth distributions conclusions are drawn concerning the uptake of fullerene solutions by polymers and the mobility of fullerene. Fullerene does not penetrate unirradiated PI, but it does readily fill up latent tracks of energetic ions in this polymer. Depending on the specific ion track density, some 104 to 107 C60 molecules can be identified as being present in a single track. The diffusion coefficient for C60 is estimated to be at least 2 × 10−12 to 2 × 10−13 cm2s−1, much higher than expected. This may be ascribed in part to the remarkable elastic deformability of the fullerene molecule in both kinetic and dynamic motion, and to the near perfect spherical geometry accompanying elimination of dangling bonds in simultaneously minimising the surface energy.</abstract>
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