Transplanting carbon nanotubes

El-Aguizy, Tarek; Jeong, Jae-In; Jeon, Youngbae; Li, W. Z.; Z, Ren; Kim, Sung Hoon

doi:10.1063/1.1836865

Cited by 23 publications

(16 citation statements)

References 20 publications

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“…6 is 1.48 N/m. Taking the CNT diameter to be around 10 nm and its young modulus around 1.25 TPa [7], the effective Hooke's constant at midpoint loading should be around N/m. So, the apparently large slope of 1.48 N/m is due to the maximum stress afforded by the welded CNT contacts on both ends.…”

Section: Experiments Resultsmentioning

confidence: 99%

Sensitive ${\rm NH}_{3}{\rm OH}$ and HCl Gas Sensors Using Self-Aligned and Self-Welded Multiwalled Carbon Nanotubes

Tabib-Azar

Xie

2007

IEEE Sensors J.

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We present the design and fabrication of sensitive and responsive NH 3 OH and HCl sensors based on multiwalled carbon nanotubes (MWCNT). The sensors consisted of self-aligned and self-welded MWCNT bridges grown between 18 m-high silicon posts with 2-6 m gaps using metal-catalyzed chemical vapor deposition technique (CVD). The 5-10 MWCNTs spanning the gap showed excellent Ohmic electrical contacts and mechanical bonding strengths in excess of 0.1 N/CNT. The conductivity of the MWCNTs changes as oxidizing and reducing gases are physically adsorbed on their large surface-to-volume ratio structures. Since carbon atoms in CNTs do not have any dangling bonds, the interaction between CNTs and gas molecules does not lead to chemical reactions and the process is reversible.Provided that the starting MWCNTs have high resistivity, they have nearly exponential sensitivity in detecting gases and owing to their very small volume and reversible interaction with gases, they can have a very fast response time.In our experiment, upon exposure to ammonia and hydrochloric gases at room temperature, the electrical conductivity of the self-welded carbon nanotube bridges exhibited a dramatic change. The growth process, test results, and the gas sensitivities will be discussed.Index Terms-Bottom-up technique, multiwalled carbon nanotubes (MWCNTs).

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Section: Experiments Resultsmentioning

confidence: 99%

Sensitive ${\rm NH}_{3}{\rm OH}$ and HCl Gas Sensors Using Self-Aligned and Self-Welded Multiwalled Carbon Nanotubes

Tabib-Azar

Xie

2007

IEEE Sensors J.

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“…However, the precise alignment and stable assembly of such nanostructures into useful individual nanoneedles are still challenging [25]. Reported methods for the assembly of the nanostructures into needle-like structures include direct attachment of nanotubes by using a manipulator [27, 28, 30, 52-55], catalyst-patterning and direct growth of nanotubes by chemical vapor deposition [56-58], alignment and assembly using dielectrophoresis or magnetic fields [25, 59-66], and transplanting of single nanotubes encapsulated in polymer blocks [67, 68]. However, these methods do not reproducibly produce nanoneedles in large quantity or produce high-aspect ratio “water-stable” nanoneedles (that can survive the meniscus forces involved in the intracellular delivery operation) [25, 28, 54].…”

Section: Fabrication Of Nanoneedles For Intracellular Deliverymentioning

confidence: 99%

Biofunctionalized nanoneedles for the direct and site-selective delivery of probes into living cells

Yum

Wang

et al. 2011

Biochimica et Biophysica Acta (BBA) - General Subjects

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Background Accessing the interior of live cells with minimal intrusiveness for visualizing, probing and interrogating biological processes has been the ultimate goal of much of the biological experimental development. Scope of Review The recent development and use of the bio-functionalized nanoneedles for local and spatially-controlled intracellular delivery brings in exciting new opportunities in accessing the interior of living cells. Here we review the technical aspect of this relatively new intracellular delivery method and the related demonstrations and studies, and provide our perspectives on the potential wide applications of this new nanotechnology-based tool in the biological field, especially on its use for high resolution studies of biological processes in living cells. Major Conclusions Different from the traditional micropipette-based needles for intracellular injection, a nanoneedle deploys a sub-100 nm diameter solid nanowire as a needle to penetrate a cell membrane and to transfer and deliver the biological cargo conjugated onto its surface to the target regions inside a cell. Although the traditional micropipette-based needles can be more efficient in delivery biological cargoes, a nanoneedle-based delivery system offers an efficient introduction of biomolecules into living cells with high spatiotemporal resolution but minimal intrusion and damage. It offers a potential solution to quantitatively address biological processes at the nanoscale. General significance The nanoneedle-based cell delivery system provides new possibilities for efficient, specific, and precise introduction of biomolecules into living cells for high resolution studies of biological processes, and it has potential application in addressing broad biological questions.

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“…This assembly transforms the scale of tools necessary for CNT assembly from nano-scale to micro-scale, which enables automated, parallel or even manual assembly of individual CNTs to MEMS in a deterministic and reproducible way. Previously, authors reported a bundle of CNTs could be transplanted from where they were grown to where they could function [4]. This paper presents that a single strand CNT can be transplanted to make a CNT-tipped AFM probes which includes detailed design and fabrication process of integrating individual CNTs into MEMS devices and quantitative characterization of physicochemical interactions of the individual CNTs with encapsulating polymers and etchants during the transplanting process.…”

Section: Introductionmentioning

confidence: 98%

Integration of Carbon Nanotubes into MEMS Devices via Deterministic Transplanting Assembly

Kim

Lee

Kim

2009

2009 IEEE 22nd International Conference on Micro Electro Mechanical Systems

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This paper presents a new method to assemble individual nanostructures such as a single strand carbon nanotube (CNT) at a deterministic location of MEMS devices. An array of vertically aligned CNTs grown on nickel nano-dots was encapsulated into MEMS scale polymer blocks that were then transplanted to MEMS cantilevers to make CNT-tipped atomic force microscope (AFM) probes. Even manual transfer of a CNT-bearing polymer block to the target location leads to reliable and reproducible fabrication of a CNT-based device such as the CNT-tipped AFM probe. The scanning experimental results on AFM standard gratings and biological samples confirm the superior characteristic of CNTs (high aspect ratio and toughness) and justify this assembly method can be useful to mass produce nanostructured MEMS devices.

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Transplanting carbon nanotubes

Cited by 23 publications

References 20 publications

Sensitive ${\rm NH}_{3}{\rm OH}$ and HCl Gas Sensors Using Self-Aligned and Self-Welded Multiwalled Carbon Nanotubes

Sensitive ${\rm NH}_{3}{\rm OH}$ and HCl Gas Sensors Using Self-Aligned and Self-Welded Multiwalled Carbon Nanotubes

Biofunctionalized nanoneedles for the direct and site-selective delivery of probes into living cells

Integration of Carbon Nanotubes into MEMS Devices via Deterministic Transplanting Assembly

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