Cited Article: Ghosh, S. Carbon nanotube flow sensors
Alert Expires: 09 NOV 2010
Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Water-mediated signal multiplication with Y-shaped carbon nanotubes
Authors:
Tu, YS; Xiu, P; Wan, RZ; Hu, J; Zhou, RH; Fang, HP
Author Full Names:
Tu, Yusong; Xiu, Peng; Wan, Rongzheng; Hu, Jun; Zhou, Ruhong; Fang, Haiping
Source:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 106 (43): 18120-18124 OCT 27 2009
Language:
English
Document Type:
Article
Author Keywords:
confined water; molecular dynamics; molecular signal transmission; Y-shaped nanochannel; signal transduction
KeyWords Plus:
MOLECULAR-DYNAMICS; CHANNEL; MECHANISM; TRANSPORT; CONDUCTION; JUNCTIONS; ELECTRON; LOGIC; FLOW
Abstract:
Molecular scale signal conversion and multiplication is of particular importance in many physical and biological applications, such as molecular switches, nano-gates, biosensors, and various neural systems. Unfortunately, little is currently known regarding the signal processing at the molecular level, partly due to the significant noises arising from the thermal fluctuations and interferences between branch signals. Here, we use molecular dynamics simulations to show that a signal at the single-electron level can be converted and multiplied into 2 or more signals by water chains confined in a narrow Y-shaped nanochannel. This remarkable transduction capability of molecular signal by Y-shaped nanochannel is found to be attributable to the surprisingly strong dipole-induced ordering of such water chains, such that the concerted water orientations in the 2 branches of the Y-shaped nanotubes can be modulated by the water orientation in the main channel. The response to the swit!
ching of the charge signal is very rapid, from a few nanoseconds to a few hundred nanoseconds. Furthermore, simulations with various water models, including TIP3P, TIP4P, and SPC/E, show that the transduction capability of the Y-shaped carbon nanotubes is very robust at room temperature, with the interference between branch signals negligible.
Reprint Address:
Zhou, RH, IBM Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA.
Research Institution addresses:
[Zhou, Ruhong] IBM Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA; [Tu, Yusong; Xiu, Peng; Wan, Rongzheng; Hu, Jun; Fang, Haiping] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China; [Tu, Yusong] Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China; [Xiu, Peng] Shandong Univ, Sch Phys, Jinan 250100, Peoples R China; [Zhou, Ruhong] Columbia Univ, Dept Chem, New York, NY 10027 USA
E-mail Address:
ruhongz@us.ibm.com; fanghaiping@sinap.ac.cn
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Cited Reference Count:
42
Times Cited:
0
Publisher:
NATL ACAD SCIENCES; 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA
Subject Category:
Multidisciplinary Sciences
ISSN:
0027-8424
DOI:
10.1073/pnas.0902676106
IDS Number:
512DB
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Title:
Carbon nanotube growth at the tip of SiO2 nanocone
Authors:
Kumar, R; Choi, C; Hwang, IC; Thakur, N
Author Full Names:
Kumar, Rajesh; Choi, Changhoon; Hwang, In-Chul; Thakur, Nagesh
Source:
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS 29 (8): 2384-2387 OCT 15 2009
Language:
English
Document Type:
Article
Author Keywords:
CNT; SiO2 nanocone; Nanotip; Fe particles; Annealing temperature
KeyWords Plus:
SCANNING PROBE MICROSCOPY; ATOMIC-FORCE MICROSCOPY; MICROTUBULES; FABRICATION; STRENGTH
Abstract:
A well aligned growth of carbon nanotube (CNT) at the tip of SiO2 nanocone using chemical vapor deposition (CVD) method is described. Fe particle at the tip of a nanocone has been observed to work as the catalyst for CNT growth. Initially. a number of self organized SiO2 nanocones were grown via thermal annealing of MnCl2 on Si substrate in the presence of H-2 gas. The average diameters of the tip and base of the nanocones were nearly 50 nm and 1 mu m, respectively, with length up to 2.4 mu m. At the tip of the nanocone a CNT was grown successfully. The CNT grows from the tip of the nanocone where Fe particles accumulate after the reduction of FeCl3 at 950 degrees C. The accumulation point of Fe particles depends on the orientation of the nanocone tip inside the reaction tube during CVD process. Therefore, the alignment of nanotube at the tip of SiO2 nanocone can be controlled by orientation of the nanocone in the reaction tube. (C) 2009 Elsevier B.V. All rights reserved.
Reprint Address:
Hwang, IC, Pohang Univ Sci & Technol, Dept Chem, Ctr Superfunct Mat, San 31 Hyojadong, Pohang 790784, South Korea.
Research Institution addresses:
[Kumar, Rajesh; Hwang, In-Chul] Pohang Univ Sci & Technol, Dept Chem, Ctr Superfunct Mat, Pohang 790784, South Korea; [Kumar, Rajesh; Thakur, Nagesh] Himachal Pradesh Univ, Dept Phys, Shimla 171005, Himachal Prades, India; [Choi, Changhoon] POSCO Tech Res Labs, Surface Technol Res Grp, Gwangyang 545090, South Korea
E-mail Address:
spfe@postech.ac.kr
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Cited Reference Count:
28
Times Cited:
0
Publisher:
ELSEVIER SCIENCE BV; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Subject Category:
Materials Science, Biomaterials
ISSN:
0928-4931
DOI:
10.1016/j.msec.2009.06.011
IDS Number:
512NP
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