The Board of Trustees of the Leland Stanford Junior University
대리인 / 주소
Crawford Maunu PLLC
인용정보
피인용 횟수 :
0인용 특허 :
9
초록
Carbon nanotube devices are manipulated in a manner that is useful for a variety of implementations. According to an example embodiment of the present invention, light (632) is used to photodesorb molecules from a carbon nanotube (620).
대표청구항▼
What is claimed is: 1. A method for using a carbon nanotube device including a carbon nanotube, the method comprising: using a light source to direct light at the carbon nanotube and to desorb molecules from the carbon nanotube; detecting a change in an electrical characteristic of the carbon nanot
What is claimed is: 1. A method for using a carbon nanotube device including a carbon nanotube, the method comprising: using a light source to direct light at the carbon nanotube and to desorb molecules from the carbon nanotube; detecting a change in an electrical characteristic of the carbon nanotube; and using the detected change to detect that the molecules have been desorbed from the carbon nanotube. 2. The method of claim 1, wherein using a light source to direct light at the carbon nanotube includes exciting plasmons in the carbon nanotube with the directed light. 3. The method of claim 1, wherein using a light source to direct light at the carbon nanotube includes directing ultraviolet (UV) light at the carbon nanotube, the UV light having a wavelength that is sufficient to desorb the molecules from the carbon nanotube. 4. The method of claim 3, wherein directing UV light at the carbon nanotube includes directing UV light having a wavelength of about 254 nanometers. 5. The method of claim 4, wherein directing UV light at the carbon nanotube includes directing UV light having an intensity of about 2.0 mW/cm2 at the carbon nanotube. 6. The method of claim 1, further comprising drawing a vacuum on the carbon nanotube and preventing molecules from adsorbing to the carbon nanotube, after using a light source to desorb molecules from the carbon nanotube. 7. The method of claim 1, further comprising: applying a voltage across the carbon nanotube before the step of detecting a change in an electrical characteristic of the carbon nanotube. 8. The method of claim 1, prior to using a light source to direct light at the carbon nanotube, further comprising: introducing molecules to the carbon nanotube; detecting an electrical characteristic of the carbon nanotube and detecting the presence of the molecules via the detected electrical characteristic; and wherein desorbing molecules from the carbon nanotube includes using the light source to purge the introduced molecules from the carbon nanotube. 9. The method of claim 1, further comprising sealing the carbon nanotube in a circuit arrangement that prevents molecules from adsorbing to the carbon nanotube, after using a light source to desorb molecules from the carbon nanotube. 10. A method for using a carbon nanotube device including a carbon nanotube, the method comprising: using a light source to direct light at the carbon nanotube and to desorb molecules from the carbon nanotube; drawing a vacuum on the carbon nanotube and preventing molecules from adsorbing to the carbon nanotube, after using a light source to desorb molecules from the carbon nanotube; and applying a gating voltage to the carbon nanotube. 11. The method of claim 10, wherein applying a gating voltage to the carbon nanotube includes applying the gating voltage such that the carbon nanotube exhibits electrical transport through the valence band in response to applying a high negative voltage thereto, exhibits insulative behavior in response to applying about zero voltage thereto and exhibits electrical transport through the conduction band in response to applying a high positive voltage thereto. 12. A molecular sensor comprising: a carbon nanotube; means for introducing molecules to the carbon nanotube, the molecules adsorbing to the carbon nanotube and changing an electrical characteristic thereof; a detection circuit configured and arranged to detect the changed electrical characteristic of the carbon nanotube and to detect the presence of the adsorbed molecules via the changed electrical characteristic; and a light source configured and arranged to direct light to the carbon nanotube, after detecting the presence of the adsorbed molecules, and to desorb the molecules from the carbon nanotube. 13. The molecular sensor of claim 12, wherein the detection circuit is further configured and arranged for detecting the composition of the molecules adsorbed to the carbon nanotube via the detected changed electrical characteristic. 14. A circuit arrangement comprising: a carbon nanotube; circuitry coupled across the carbon nanotube; and a light source configured and arranged to direct light to the carbon nanotube for desorbing molecules therefrom. 15. The circuit arrangement of claim 14, wherein the light source is adapted to change the conductance of the carbon nanotube via the directed light. 16. The circuit arrangement of claim 14, further comprising: a chamber that includes the carbon nanotube; and a vacuum arrangement configured and arranged to draw a vacuum on the chamber. 17. The circuit arrangement of claim 16, wherein the vacuum arrangement is configured and arranged to remove desorbed molecules from the chamber. 18. The circuit arrangement of claim 14, further comprising a silicon substrate having a gate therein, the carbon nanotube being over the gate in the silicon substrate, the gate being configured and arranged to capacitively couple a voltage to the carbon nanotube. 19. The circuit arrangement of claim 18, wherein the carbon nanotube exhibits electrical transport through the valence band in response to the gate capacitively coupling a high negative voltage thereto, exhibits insulative behavior in response to the gate capacitively coupling about zero voltage thereto, and exhibits electrical transport through the conduction band in response to the gate capacitively coupling a high positive voltage thereto. 20. The circuit arrangement of claim 14, wherein the light source is configured and arranged to apply ultraviolet light to the carbon nanotube. 21. The circuit arrangement of claim 14, wherein the light source is configured and arranged to direct light having a wavelength of about 254 nanometers. 22. The circuit arrangement of claim 14, wherein the carbon nanotube exhibits a conductance that is a function of the wavelength of the light being directed thereto, and wherein the light source is configured and arranged to control the conductance of the carbon nanotube via the wavelength of the light directed thereto. 23. The circuit arrangement of claim 14, further comprising a gas supply configured and arranged to introduce a gas that attaches to the carbon nanotube and to increase the conductance of the carbon nanotube via the attached gas. 24. The circuit arrangement of claim 14, wherein the carbon nanotube exhibits a conductance that is a function of the intensity of the light being directed thereto, and wherein the light source is configured and arranged to control the conductance of the carbon nanotube via the intensity of the light. 25. A memory arrangement comprising: a carbon nanotube; a source configured and arranged to introduce molecules to the carbon nanotube for adsorbing the molecules to the carbon nanotube; a light source configured and arranged to direct light at the carbon nanotube and to selectively desorb said molecules from the carbon nanotube; memory circuitry electrically coupled to the carbon nanotube and configured and arranged for detecting an electrical characteristic of the carbon nanotube, the electrical characteristic being responsive to the molecules; and wherein the detected electrical characteristic exhibits a first state in response to the carbon nanotube having the molecules adsorbed thereto and wherein the detected electrical characteristic exhibits a second state in response to the carbon nanotube not having the molecules adsorbed thereto. 26. The memory arrangement of claim 25, wherein the memory circuitry is configured and arranged for reading out a first value in response to the detected electrical characteristic exhibiting the first state and for reading out a second value in response to the detected electrical characteristic exhibiting the second state. 27. The memory arrangement of claim 25, wherein the light source is configured and arranged to selectively desorb the molecules in response to a write access to the carbon nanotube. 28. The memory arrangement of claim 27, wherein the light source is configured and arranged to switch the carbon nanotube between the first and second states, via the directed light, in response to signals applied to the light source.
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이 특허에 인용된 특허 (9)
Cheung Jeffrey T. (Thousand Oaks CA), Ambient temperature gas sensor.
Massey Richard J. ; Martin Mark T. ; Dong Liwen ; Lu Ming ; Fischer Alan ; Jameison Fabian ; Liang Pam ; Hoch Robert ; Leland Jonathan K., Graphitic nanotubes in luminescence assays.
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