Selective parallel integration of individual metallic single-walled carbon nanotubes from heterogeneous solutions
The dielectrophoretic separation of individual metallic single-walled carbon nanotubes (SWNTs) from heterogeneous solutions and their simultaneous deposition between electrodes is achieved and confirmed by direct electric transport measurements. Out-of-solution guided parallel assembly of individual...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1992. - 26(2010), 13 vom: 06. Juli, Seite 10419-24 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2010
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article |
| Zusammenfassung: | The dielectrophoretic separation of individual metallic single-walled carbon nanotubes (SWNTs) from heterogeneous solutions and their simultaneous deposition between electrodes is achieved and confirmed by direct electric transport measurements. Out-of-solution guided parallel assembly of individual SWNTs was investigated for electric field frequencies between 1 and 200 MHz. At 200 MHz, 19 of the 22 deposited SWNTs (86%) displayed metallic behavior, whereas at lower frequencies the expected random growth distribution of 1/3 metallic SWNTs prevailed. A threshold separation frequency of 188 MHz is extracted from a surface-conductivity model, and a conductivity weighting factor is introduced to elucidate the separation frequency dependence. Low-frequency experiments and numerical simulations show that long-range nanotube transport is governed by hydrodynamic effects whereas local trapping is dominated by dielectrophoretic forces. The electrokinetic framework of dielectrophoresis in low-concentration solutions is thus provided and allows a deeper understanding of the underlying mechanisms in dielectrophoretic deposition processes for long and large-diameter SWNT-based low-resistance device integration |
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| Beschreibung: | Date Completed 30.09.2010 Date Revised 30.06.2010 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la1013158 |