Electrical Characteristics of the Concentric-Shape Carbon Nanotube Network Device in pH Buffer Solution

Cheon, Jun Ho; Lim, Jaeheung; Seo, Sang Soo; Woo, J. C.; Kim, Seok Hyang; Kwon, Yonghwan; Ko, Jung Woo; Kang, Tae June; Kim, Yong Hyup; Park, Young June

doi:10.1109/ted.2010.2062518

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…This self-gating phenomenon has been recently published by our group. 12,13 Second, the [CGi] channel consisting of the SWCNT network and Au nanoislands between the electrodes can be fabricated by SWCNT dipcoating and physical evaporation of Au, respectively. Thanks to the concentric electrode structure, as shown in Scheme 1 and Figure 1, unwanted CNTs coated on the enclosing electrode do not have to be removed because the enclosing electrode effectively shields the interference from the neighbor channel device.…”

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Multi-Order Dynamic Range DNA Sensor Using a Gold Decorated SWCNT Random Network

Woo

Ahn

et al. 2011

ACS Nano

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A novel electrical DNA biosensor is presented, which consists of gold (Au) nanoscale islands and a single-walled carbon nanotube (SWCNT) network on top of a concentric Au electrode array (also referred to as the CGi). The decorated Au islands on the SWCNT network provide ideal docking sites for ss-DNA probe (p-DNA) molecules. They also provide better adhesion between the SWCNT network and the chip substrate. In addition, the concentric electrode gives asymmetric current voltage characteristics in the solution and provides more flexible bias options to the electrodes. The sensor system is applied to a DNA sensor after functionalization with a 25 mer p-DNA (5'-HSC(6)-C(18)-GCCATTCTCACCGGATTCAGTCGTC-3'), hereafter called the [CGi+p-DNA]. The response of the DNA sensor has been measured in both real-time during hybridization with the complementary target ss-DNAs (t-DNA) and the static mode after the hybridization and washing steps. A wide dynamic range from the 100 fM to 1 μM has been achieved from the real-time mode and the static mode. Moreover, it is shown that the sensor system differentiates partially mismatched (single nucleotide polymorphism (SNP), half mismatch, noncomplementary) t-DNA, as well. The [CGi] sensor platform can be easily extended to target specific biological recognition elements such as aptamers or proteins.

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Multi-Order Dynamic Range DNA Sensor Using a Gold Decorated SWCNT Random Network

Woo

Ahn

et al. 2011

ACS Nano

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“…To verify the idea, we use the unique biosensor architecture previously developed by our group. [29][30][31] We have reported a wide dynamic range DNA sensor based on CNN transistors, with GNP as a probe molecule docking place. 29 The sensor array platform used in this study consists of two gold (Au) electrodes with a concentric structure, CNN as an electrical channel, and GNP decorated on CNN for a molecule binding site, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The concentric electrode structure has been formed by the conventional two-metal process. 30 Each electrode is interconnected to each external electrical pad via the underlying aluminum metal layer. The channel consisting of the CNN and GNP can be fabricated by carbon nanotube dip-coating, and physical evaporation of Au, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…29 The concentric electrode structure provides an interesting feature, called the ''self-gating effect''. 30,31 The effect can be elaborated as the electrical potential of an electrolyte solution applied on the sensor platform being generally determined by the potential of the enclosing (source) electrode, which has much larger area, due to the capacitance ratio (1000 : 1 in this work).…”

Section: Resultsmentioning

confidence: 99%

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Modulation of molecular hybridization and charge screening in a carbon nanotube network channel using the electrical pulse method

et al. 2013

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In this paper, we investigate the effect of electrical pulse bias on DNA hybridization events in a biosensor platform, using a Carbon Nanotube Network (CNN) and Gold Nano Particles (GNP) as an electrical channel. The scheme provides both hybridization rate enhancement of bio molecules, and electrical measurement in a transient state to avoid the charge screening effect, thereby significantly improving the sensitivity. As an example, the probe DNA molecules oscillate with pulse trains, resulting in the enhancement of DNA hybridization efficiency, and accordingly of the sensor performances in Tris-EDTA (TE) buffer solution, by as much as over three times, compared to the non-biasing conditions. More importantly, a wide dynamic range of 10(6) (target-DNA concentration from 5 pM to 5 μM) is achieved in human serum. In addition, the pulse biasing method enables one to obtain the conductance change, before the ions within the Electrical Double Layer (EDL) are redistributed, to avoid the charge screening effect, leading to an additional sensitivity enhancement.

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“…Apart from their rare existence, CNTs find their utilization as an added substance in structural materials, for instance, golf stub, water-boat, airship and engine-bicycles. Also, CNTs are extensively used in compound goods [3,4], electrical gadgets [5][6][7][8], hydrogen stockpiling [9,10], bio-therapeutic designing [11][12][13] and so on. CNTs exhibit immense thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Entropy analysis of Hall current and thermal radiation influenced by cilia with single- and multi-walled carbon nanotubes

2019

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The present investigation explores the significance of creeping viscous nanofluids in an axi-symmetric channel influenced by metachronal waves containing magnetohydrodynamics and Hall current. Heat transport analysis is also performed to derive the impact of thermal radiation on internal heat source phenomena. The use of mathematical formulation resulted in a set of nonlinear coupled partial differential equations. The governed differential system is transformed into an ordinary differential system by considering similar variables. Exact solutions in the closed form have been derived for the temperature, momentum and pressure gradient. Moreover, entropy generation due to heat transfer, thermal radiation and magnetic effects has been measured. The graphical results have been presented to interpret sundry parameters of interest. Streamlines and isotherms are also plotted against the multi-walled carbon nanotube. For the validation of our results, a comparison table is presented. It is also seen that entropy of the system increases and the Bejan number decreases with an increase in the Brinkman number.

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Electrical Characteristics of the Concentric-Shape Carbon Nanotube Network Device in pH Buffer Solution

Cited by 12 publications

References 15 publications

Multi-Order Dynamic Range DNA Sensor Using a Gold Decorated SWCNT Random Network

Multi-Order Dynamic Range DNA Sensor Using a Gold Decorated SWCNT Random Network

Modulation of molecular hybridization and charge screening in a carbon nanotube network channel using the electrical pulse method

Entropy analysis of Hall current and thermal radiation influenced by cilia with single- and multi-walled carbon nanotubes

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