Long and Oriented Single-Walled Carbon Nanotubes Grown by Ethanol Chemical Vapor Deposition

Huang, Limin; Cui, Xiaodong; White, Brian E.; O’Brien, Stephen

doi:10.1021/jp0474125

Cited by 141 publications

(113 citation statements)

References 29 publications

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“…Au (50 nm) on Cr (5 nm) pads, which are separated by 20 m, form the contact to an individual single-walled carbon nanotube (SWNT). The nanotubes were grown by a chemical vapor deposition (CVD) process described elsewhere (12,13). The nanotube is then oxidatively cut by using an ultrafine lithographic process that produces a very small gap between the nanotube ends (13)(14)(15).…”

Section: Resultsmentioning

confidence: 99%

Chemoresponsive monolayer transistors

Guo

Myers²,

Xiao³

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

146

167

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This work details a method to make efficacious field-effect transistors from monolayers of polycyclic aromatic hydrocarbons that are able to sense and respond to their chemical environment. The molecules used in this study are functionalized so that they assemble laterally into columns and attach themselves to the silicon oxide surface of a silicon wafer. To measure the electrical properties of these monolayers, we use ultrasmall point contacts that are separated by only a few nanometers as the source and drain electrodes. These contacts are formed through an oxidative cutting of an individual metallic single-walled carbon nanotube that is held between macroscopic metal leads. The molecules assemble in the gap and form transistors with large current modulation and high gate efficiency. Because these devices are formed from an individual stack of molecules, their electrical properties change significantly when exposed to electron-deficient molecules such as tetracyanoquinodimethane (TCNQ), forming the basis for new types of environmental and molecular sensors.chemistry ͉ electronic materials ͉ nanoscience ͉ self-assembly T his work details a method to make chemoresponsive transistors by making devices out of a monolayer of polycyclic aromatic hydrocarbons that are chemically attached to surfaces. The devices are formed through a self-assembly process of organic semiconductors on the oxide surface of a silicon wafer (Fig. 1A) (1, 2). Previous studies on organic field-effect transistors (OFETs) (3, 4) have shown that the path for electrical current is through at most the first few layers of molecules at the oxide interface (5-7). In general, when the semiconducting layers of typical OFETs are scaled down to a monolayer, their properties become poor, presumably due to discontinuities or defects in the films (8-11). The strategy used here circumvents this problem by a chemical functionalization of the molecular semiconductors ( Fig. 1B) so that they both assemble laterally and chemically attach themselves to the substrate (Fig. 1C). The important result is that when ultrasmall point contacts separated by molecular length-scales are used as the source and drain (S͞D) electrodes, transistors can be made that have high gate efficiency and large ON͞OFF ratios from only a monolayer of molecules. The electrical properties of these monolayers are responsive to electron acceptors such as tetracyanoquinodimethane (TCNQ). Results and DiscussionDevice Fabrication. We first describe the devices used to measure the properties of the monolayers and then the structural and electrical characterization of these monolayers. Fig. 2 shows a schematic and micrograph of the devices used. Au (50 nm) on Cr (5 nm) pads, which are separated by 20 m, form the contact to an individual single-walled carbon nanotube (SWNT). The nanotubes were grown by a chemical vapor deposition (CVD) process described elsewhere (12, 13). The nanotube is then oxidatively cut by using an ultrafine lithographic process that produces a very small gap between the nan...

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Section: Resultsmentioning

confidence: 99%

Chemoresponsive monolayer transistors

Guo

Myers²,

Xiao³

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

146

167

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“…Growth of Single-Walled Carbon Nanotubes (SWCNTs): The growth of SWCNTs was performed using a typical ethanol CVD method [33,37,43]. The DPN-patterned substrates were placed in the middle of a quartz tube furnace with 1 inch diameter.…”

Section: Methodsmentioning

confidence: 99%

Patterning Colloidal Metal Nanoparticles for Controlled Growth of Carbon Nanotubes

Goh

Zhou

et al. 2008

Advanced Materials

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Single‐walled carbon‐nanotube (SWCNT) arrays are generated on catalyst patterns with controlled location, orientation, and spacing using a straightforward approach. Dip‐pen nanolithography is used to fabricate catalyst patterns with sub‐70 nm resolution, and SWCNTs are successfully grown on these patterns through chemical vapor deposition. The growth direction of the SWCNTs on quartz is controlled, and along the [100] crystallographic direction.

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“…We examined individual single-walled carbon nanotubes prepared by ambient chemical vapor deposition methods using a modified fast-heating process [63]. The nanotubes were grown directly over open slits of 20-30 μm width cut in SiO 2 /Si substrates.…”

Section: A Sample Preparation and Device Fabricationmentioning

confidence: 99%

Tunable electronic correlation effects in nanotube-light interactions

et al. 2015

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Electronic many-body correlation effects in one-dimensional (1D) systems such as carbon nanotubes have been predicted to strongly modify the nature of photoexcited states. Here we directly probe this effect using broadband elastic light scattering from individual suspended carbon nanotubes under electrostatic gating conditions. We observe significant shifts in optical transition energies, as well as line broadening, as the carrier density is increased. The results demonstrate the role of screening of many-body electronic interactions on the different length scales, a feature inherent to quasi-1D systems. Our findings further demonstrate the possibility of electrical tuning of optical transitions and provide a basis for understanding of various optical phenomena in carbon nanotubes and other quasi-1D systems in the presence of charge carrier doping.

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Long and Oriented Single-Walled Carbon Nanotubes Grown by Ethanol Chemical Vapor Deposition

Cited by 141 publications

References 29 publications

Chemoresponsive monolayer transistors

Chemoresponsive monolayer transistors

Patterning Colloidal Metal Nanoparticles for Controlled Growth of Carbon Nanotubes

Tunable electronic correlation effects in nanotube-light interactions

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