Resistivity scaling in single-walled carbon nanotube films patterned to submicron dimensions

Behnam, Ashkan; Noriega, Leila; Choi, Yong Je; Wu, Zhuangchun; Rinzler, Andrew G.; Ural, Ant

doi:10.1063/1.2339029

Cited by 59 publications

(83 citation statements)

References 15 publications

(20 reference statements)

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“…1,22,23 Film thicknesses of ϳ75 nm that are far above the percolation threshold ͑which is a few nanometers͒ were used for this study. Following the deposition, the CNT film was patterned into four-point-probe structures by photolithography or e-beam lithography ͑de-pending on the device width͒ and subsequently etched using an O 2 chemistry in an inductively coupled plasma reactive ion etcher, as described in detail previously.…”

Section: Methodsmentioning

confidence: 99%

Temperature-dependent transport and1/fnoise mechanisms in single-walled carbon nanotube films

et al. 2010

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The temperature dependence of 1 / f noise and resistivity in single-walled carbon nanotube ͑CNT͒ films are studied. We find that as the temperature decreases, resistivity monotonically increases whereas 1 / f noise amplitude first decreases, then increases, reaching a minimum at around 40 K. At temperatures considerably smaller than 40 K, the temperature dependence of both resistivity and 1 / f noise amplitude can be explained by three-dimensional Mott variable-range hopping, which is due to localization effects that result in an insulating behavior in CNT films. At higher temperatures, on the other hand, the dependence of resistivity on temperature can be explained by fluctuation-induced tunneling. In this high-temperature regime, we analyze the temperature dependence of the noise amplitude to extract the density of fluctuators as a function of their energy. Our results show a characteristic peak between 0.3 and 0.6 eV that is responsible for the majority of 1 / f noise. We also find that, due to its correlation with the number of carriers, the noise amplitude is very sensitive to CNT film device dimensions, especially near the percolation threshold where the resistivity increases. These results not only provide fundamental physical insights about transport and 1 / f noise mechanisms in CNT films at different temperatures but also help assess the suitability of these films for device applications.

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Section: Methodsmentioning

confidence: 99%

Temperature-dependent transport and1/fnoise mechanisms in single-walled carbon nanotube films

et al. 2010

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“…167,168 Percolation effects show a power law behavior of channel resistance with channel length (Fig. 2b), 164,167,169 channel width, CNT network density, and CNT alignment. 166 The field-effect mobility of CNT TFTs (< 100 cm 2 /Vs) is significantly less than that for a single CNT (> 10,000 cm 2 /Vs) mainly for the following two reasons.…”

Section: Carbon Nanotube Thin-film Transistors For Digital Electronicsmentioning

confidence: 99%

Carbon nanomaterials for electronics, optoelectronics, photovoltaics, and sensing

et al. 2013

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In the last three decades, zero-dimensional, one-dimensional, and two-dimensional carbon nanomaterials (i.e., fullerenes, carbon nanotubes, and graphene, respectively) have attracted significant attention from the scientific community due to their unique electronic, optical, thermal, mechanical, and chemical properties. While early work showed that these properties could enable high performance in selected applications, issues surrounding structural inhomogeneity and imprecise assembly have impeded robust and reliable implementation of carbon nanomaterials in widespread technologies. However, with recent advances in synthesis, sorting, and assembly techniques, carbon nanomaterials are experiencing renewed interest as the 2 basis of numerous scalable technologies. Here, we present an extensive review of carbon nanomaterials in electronic, optoelectronic, photovoltaic, and sensing devices with a particular focus on the latest examples based on the highest purity samples. Specific attention is devoted to each class of carbon nanomaterial, thereby allowing comparative analysis of the suitability of fullerenes, carbon nanotubes, and graphene for each application area. In this manner, this article will provide guidance to future application developers and also articulate the remaining research challenges confronting this field.Deep Jariwala is currently working as a graduate student under supervision of Prof. Mark

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“…The experimental relationship between the transmittance and the sheet resistance of the film is plotted in Figure 3, along with the relationship between the steady-state temperatures for an applied voltage of 60 V for eight different SWCNT films on glass substrates measuring 2.5 × 2.5 × 0.3 cm SWCNTs should be established based on long length, low density SWCNTs, as reported in a previous study. [17,18] The length of the SWCNTs affects the sheet resistance and transmittance of the film. When the length of the SWCNTs is short, contacts between networked SWCNTs increase, and this leads to an increase of the overall film resistance.…”

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Transparent Film Heater Using Single‐Walled Carbon Nanotubes

et al. 2007

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Since their discovery, many practical applications of carbon nanotubes (CNTs) have been proposed because of their excellent properties. Many researchers have reported remarkable electrical, optical, and thermal properties of CNTs. The electrical conductivity of single-walled carbon nanotubes (SWCNTs) is very high (10 6 S m -2 ). Films made of SWCNTs also possess a low sheet resistance and exhibit an optical transmittance in the visible spectrum comparable to that of commercial indium tin oxide (ITO). [1,2] Recently, a thermal conductivity of nearly 3500 W m -1 K -1 was measured at room temperature for SWCNTs measuring 2.6 lm in length and 1.7 nm in diameter. [3] This thermal conductivity value is much higher than that of diamond. In the field of thermal engineering, research has focused on enhancing their heat-transfer properties. CNTs have been modeled as heat-sink fins in cooling channels for microelectronics, and several groups have developed various CNT mats and composites for the next generation of thermal interface materials. [4][5][6][7][8][9][10][11][12][13] Although a high thermal conductivity is a central issue in thermal engineering, few pioneering works have utilized other useful properties of CNTs, such as their high electrical conductivity and optical transparency. Therefore, we propose a unique application of SWCNT films as transparent heaters. Currently, thin ITO films has been used as transparent heaters in various applications, such as outdoor panel displays, avionic displays, liquid-crystal display (LCD) panels for use in harsh environments, periscopes, and vehicle window defrosters. However, ITO film heaters have some limitations, such as a slow thermal response and complex fabrication processes.Because CNT films have a high thermal conductivity and can be produced by using various common fabrication methods [1,2,[14][15][16] they are a promising alternative to ITO films in transparent heaters. To our knowledge, there are no reports about transparent CNT film heaters. Therefore, we fabricated the first transparent film heater using SWCNTs and investigated its heating performance. Purified SWCNTs were grown by using the arc discharge technique. We chose the vacuum filtration method to fabricate the transparent SWCNT films. In this manner we could control the transparency and obtain excellent uniformity of the networked SWCNT films.[2] First, the SWCNT samples were purified using standard processes, such as centrifugation, acid treatment, and membrane filtration. The SWCNTs were then dispersed in deionized water with a 1 wt % sodium dodecyl sulfate (SDS) solution and sonicated for several hours. The film transparency was modulated by adjusting the volume of the SWCNT solution between 0.5 and 4.0 mL. This resulted in SWCNT films with a transparency of 65-97 % and a sheet resistance of 230-3500 X m -2 . An anodic aluminium oxide (AAO) membrane with 200 nm pores (Whatman International, Anodisc 47) was used as a filter. The CNT membrane was soaked in NaOH solution for 1 h, rinsed with deionized wate...

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Resistivity scaling in single-walled carbon nanotube films patterned to submicron dimensions

Cited by 59 publications

References 15 publications

Temperature-dependent transport and1/fnoise mechanisms in single-walled carbon nanotube films

Temperature-dependent transport and1/fnoise mechanisms in single-walled carbon nanotube films

Carbon nanomaterials for electronics, optoelectronics, photovoltaics, and sensing

Transparent Film Heater Using Single‐Walled Carbon Nanotubes

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