A Lab-on-a-Chip Device Using a Dielectrophoresis-Aligned Carbon Nanotube Sensor Array

2011 ◽  
Author(s):  
Pengfei Li ◽  
Nan Lei ◽  
Jie Xu ◽  
Wei Xue
Keyword(s):  
Carbon Nanotube ◽  
Sensor Array ◽  
Uv Light ◽  
Lab On A Chip ◽  
High Sensitivity ◽  
Metal Electrodes ◽  
Flow Sensors ◽  
Single Walled Carbon Nanotube ◽  
Ph Values

Here we report the design, fabrication, and characterization of a lab-on-a-chip device using a nanotube-based sensor array. The microfluidic components are composed of an ultraviolet (UV) light-defined, cross-linked SU-8 microchannel and a polydimethylsiloxane (PDMS) top cover. The hybrid microfluidic structure provides a fully sealed microchannel, well-aligned features, and precisely positioned nanosensors. Well-organized single-walled carbon nanotube (SWNT) thin films are deposited and aligned across the electrodes on a silicon substrate with dielectrophoresis. The assembly of SWNTs is carried out in a sealed microchannel. The SWNT devices are configured as two-terminal resistor-type sensors with the metal electrodes as the probing pads and the dielectrophoretically captured SWNTs as the sensing elements. The SWNT devices are used as integrated flow sensors to monitor the flow rate in the microchannel. In addition, when exposed to aqueous solutions with various pH values, these sensors change their resistance accordingly and demonstrate high sensitivity towards pH solutions.

Synthesis and Characterization of Poly(2,5-benzimidazole) (ABPBI) Grafted Carbon Nanotubes

2009 ◽  
Vol 1240 ◽  
Author(s):  
Ji-Ye Kang ◽  
Su-Mi Eo ◽  
Loon-Seng Tan ◽  
Jong-Beom Baek
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Interfacial Adhesion ◽  
Synthesis And Characterization ◽  
Acylation Reaction ◽  
Single Walled Carbon Nanotube ◽  
Mechanical And Electrical Properties ◽  
Multi Walled Carbon Nanotube

AbstractSingle-walled carbon nanotube (SWCNT) and multi-walled carbon nanotube (MWCNT) were functionalized with 3,4-diaminobenzoic acid via “direct” Friedel-Crafts acylation reaction in PPA/P2O5 to afford ortho-diamino-functionalized SWCNT (DIF-SWCNT) and MWCNT (DIF-MWCNT). The resultant DIF-SWCNT and DIF-MWCNT showed improved solubility and dispersibility. To improve interfacial adhesion between CNT and polymer matrix, the grafting of ABPBI onto the surface of DIF-SWCNT (10 wt%) or DIF-MWCNT (10 wt%) was conducted by simple in-situ polymerization of AB monomer, 3,4-diaminobenzoic acid dihydrochloride, in PPA. The resultant ABPBI-g-MWCNT and ABPBI-g-SWCNT showed improved the mechanical and electrical properties.

Growth and Characterization of One-Dimensional SnTe Crystals within the Single-Walled Carbon Nanotube Channels

2011 ◽  
Vol 115 (9) ◽  
pp. 3578-3586 ◽  
Author(s):  
L. V. Yashina ◽  
A. A. Eliseev ◽  
M. V. Kharlamova ◽  
A. A. Volykhov ◽  
A. V. Egorov ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Single Walled Carbon Nanotube ◽  
One Dimensional ◽  
Single Walled Carbon

Synthesis and Characterization of FePt Nanoparticle/Single Walled Carbon Nanotube Composites

2009 ◽  
Vol 620-622 ◽  
pp. 505-508 ◽  
Author(s):  
Yan Wang ◽  
Lian Gao ◽  
Jing Sun ◽  
Yang Qiao Liu
Keyword(s):  
Carbon Nanotube ◽  
Synthesis And Characterization ◽  
Fept Nanoparticles ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Nanotube Composites ◽  
Potential Applications ◽  
Carbon Nanotube Composites ◽  
20 Nm

We report the synthesis and characterization of FePt nanoparticles (NPs)/single walled carbon nanotube (SWNTs) nanocomposites, which might have important potential applications to orient CNTs and the development of new catalysts. The crystallite size of FePt NPs is about 2.5-4 nm and the Fe atom content ranges from 50% to 65%. HiPCO SWNTs have been decorated with FePt nanoparticles under mild conditions without any pretreatment. When the bundle size of HiPCO SWNTs is about 20 nm, FePt NPs mostly attach on the sidewalls of SWNTs. The loading of FePt nanoparticles on the SWNTs bundles can be conveniently controlled by adjusting the initial amount of FePt NPs. The nanocomposite showed magnetic properties in a magnetic field. TEM, HRTEM, and EDS spectra were performed to observe the nanostructure of these nanocomposites.

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