Scalable Assembly Method of Vertically<i>-</i>Suspended and Stretched Carbon Nanotube Network Devices for Nanoscale Electro-Mechanical Sensing Components

Lee, Byung Yang; Heo, Kwang; Bak, Jung Hoon; Cho, Sung Un; Moon, Seung Eon; Park, Yun Daniel; Hong, Seunghun

doi:10.1021/nl802434s

Cited by 32 publications

(23 citation statements)

References 29 publications

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“…Porous sheet networks (PSNs) have become an important topic in the research area of CNTs [7][8][9][10][11][12][13][14]. A CNT network (also called: ''Buckypaper'') is a macroscopic porous structure of entangled CNT.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of multi-walled carbon nanotube porous sheets with enhanced elongation

et al. 2012

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In this article, multi-walled carbon nanotubes (MWNTs)/dodecyl benzene sulfonic acid (DBSA) porous sheet networks (PSNs) of enhanced extensibility were developed and characterized. The MWNT/DBSA networks possess failure strains of 8-12 %, markedly higher than the literature reported values of 0.5-4 %. The networks were prepared through micro-filtration of highly dispersed MWNT in DBSA aqueous solutions. The DBSA molecule has two functions: In the dispersion stage, DBSA functions as a dispersant leading to the establishment of stable individually dispersed MWNT, and in the MWNT porous sheet, the presence of DBSA within the nanotubes' network creates a lubrication-like effect, enhancing the networks' extensibility. In fact, it was found that DBSA is assembled in two modes within the nanotubes' network: a fraction which is strongly adsorbed onto the CNT surface, and another fraction entrapped within the network as a DBSA/water solution. It should be noted that the composition of these systems is stable under ambient room temperature conditions. Comparison of MWNT networks prepared from the MWNT/DBSA dispersions and from the same but coagulated before filtration has shown superiority of the non-coagulated systems in relation to structure and mechanical properties. The prepared MWNT/DBSA PSNs of enhanced extensibility were developed without any modification by polymers, and they are characterized by high electrical conductivity and nano-porosity.

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Section: Introductionmentioning

confidence: 99%

Structure and properties of multi-walled carbon nanotube porous sheets with enhanced elongation

et al. 2012

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“…Therefore, this approach to the engineering of 3D nanoscale or microscale graphene architectures enables the development of 3D materials. When the superior properties of graphene are combined with designed 3D architectures, a wide range of applications can be achieved, such as heat transfer enhancement, 34 the control of surface wettability, 35 the development of strain sensors, 36 and the fabrication of coatings that absorb mechanical energy. 37 As an example of these applications, we examined the dependence of the electrical conductivity of a graphene structure on the load exerted on it to explore its applicability as a pressure (or touch) sensor.…”

Section: Resultsmentioning

confidence: 99%

Designed Three-Dimensional Freestanding Single-Crystal Carbon Architectures

et al. 2014

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Single-crystal carbon nanomaterials have led to great advances in nanotechnology. The first singlecrystal carbon nanomaterial, fullerene, was fabricated in a zero-dimensional form. One-dimensional carbon nanotubes and two-dimensional graphene have since followed and continue to provide further impetus to this field. In this study, we fabricated designed three-dimensional (3D) single-crystal carbon architectures by using silicon carbide templates. For this method, a designed 3D SiC structure was transformed into a 3D freestanding single-crystal carbon structure that retained the original SiC structure by performing a simple single-step thermal process. The SiC structure inside the 3D carbon structure is self-etched, which results in a 3D freestanding carbon structure. The 3D carbon structure is a single crystal with the same hexagonal close-packed structure as graphene. The size of the carbon structures can be controlled from the nanoscale to the microscale, and arrays of these structures can be scaled up to the wafer scale. The 3D freestanding carbon structures were found to be mechanically stable even after repeated loading. The relationship between the reversible mechanical deformation of a carbon structure and its electrical conductance was also investigated. Our method of fabricating designed 3D freestanding single-crystal graphene architectures opens up prospects in the field of single-crystal carbon nanomaterials, and paves the way for the development of 3D single-crystal carbon devices.

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“…This is a typical behavior of conductive percolating networks. 22,23 Therefore, it is the connectivity of the percolated network channel and not the swCNT density in the channel that determines the sensitivity of the swCNT network junction as a sensor transducer.…”

Section: Uniform Array Of Cnt Transducersmentioning

confidence: 99%

Biosensor system-on-a-chip including CMOS-based signal processing circuits and 64 carbon nanotube-based sensors for the detection of a neurotransmitter

et al. 2010

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We developed a carbon nanotube (CNT)-based biosensor system-on-a-chip (SoC) for the detection of a neurotransmitter. Here, 64 CNT-based sensors were integrated with silicon-based signal processing circuits in a single chip, which was made possible by combining several technological breakthroughs such as efficient signal processing, uniform CNT networks, and biocompatible functionalization of CNT-based sensors. The chip was utilized to detect glutamate, a neurotransmitter, where ammonia, a byproduct of the enzymatic reaction of glutamate and glutamate oxidase on CNT-based sensors, modulated the conductance signals to the CNT-based sensors. This is a major technological advancement in the integration of CNT-based sensors with microelectronics, and this chip can be readily integrated with larger scale lab-on-a-chip (LoC) systems for various applications such as LoC systems for neural networks.

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Scalable Assembly Method of Vertically-Suspended and Stretched Carbon Nanotube Network Devices for Nanoscale Electro-Mechanical Sensing Components

Cited by 32 publications

References 29 publications

Structure and properties of multi-walled carbon nanotube porous sheets with enhanced elongation

Structure and properties of multi-walled carbon nanotube porous sheets with enhanced elongation

Designed Three-Dimensional Freestanding Single-Crystal Carbon Architectures

Biosensor system-on-a-chip including CMOS-based signal processing circuits and 64 carbon nanotube-based sensors for the detection of a neurotransmitter

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