Abstract
We have constructed devices in which the interior of a single-walled carbon nanotube (SWCNT) field-effect transistor acts as a nanofluidic channel that connects two fluid reservoirs, permitting measurement of the electronic properties of the SWCNT as it is wetted by an analyte. Wetting of the inside of the SWCNT by water turns the transistor on, while wetting of the outside has little effect. These observations are consistent with theoretical simulations that show that internal water both generates a large dipole electric field, causing charge polarization of the tube and metal electrodes, and shifts the valence band of the SWCNT, while external water has little effect. This finding may provide a new method to investigate water behavior at nanoscale. This also opens a new avenue for building sensors in which the SWCNT simultaneously functions as a concentrator, nanopore, and extremely sensitive electronic detector, exploiting the enhanced sensitivity of the interior surface.
Original language | English (US) |
---|---|
Pages (from-to) | 3113-3119 |
Number of pages | 7 |
Journal | ACS Nano |
Volume | 5 |
Issue number | 4 |
DOIs | |
State | Published - Apr 26 2011 |
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Keywords
- biosensor
- carbon nanotube
- nanoconfinement
- nanofluidics
- nanopore
- water in nanoscale channels
ASJC Scopus subject areas
- Engineering(all)
- Materials Science(all)
- Physics and Astronomy(all)
Cite this
Electronic sensitivity of carbon nanotubes to internal water wetting. / Cao, Di; Pang, Pei; He, Jin; Luo, Tao; Park, Jae Hyun; Krstic, Predrag; Nuckolls, Colin; Tang, Jinyao; Lindsay, Stuart.
In: ACS Nano, Vol. 5, No. 4, 26.04.2011, p. 3113-3119.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electronic sensitivity of carbon nanotubes to internal water wetting
AU - Cao, Di
AU - Pang, Pei
AU - He, Jin
AU - Luo, Tao
AU - Park, Jae Hyun
AU - Krstic, Predrag
AU - Nuckolls, Colin
AU - Tang, Jinyao
AU - Lindsay, Stuart
PY - 2011/4/26
Y1 - 2011/4/26
N2 - We have constructed devices in which the interior of a single-walled carbon nanotube (SWCNT) field-effect transistor acts as a nanofluidic channel that connects two fluid reservoirs, permitting measurement of the electronic properties of the SWCNT as it is wetted by an analyte. Wetting of the inside of the SWCNT by water turns the transistor on, while wetting of the outside has little effect. These observations are consistent with theoretical simulations that show that internal water both generates a large dipole electric field, causing charge polarization of the tube and metal electrodes, and shifts the valence band of the SWCNT, while external water has little effect. This finding may provide a new method to investigate water behavior at nanoscale. This also opens a new avenue for building sensors in which the SWCNT simultaneously functions as a concentrator, nanopore, and extremely sensitive electronic detector, exploiting the enhanced sensitivity of the interior surface.
AB - We have constructed devices in which the interior of a single-walled carbon nanotube (SWCNT) field-effect transistor acts as a nanofluidic channel that connects two fluid reservoirs, permitting measurement of the electronic properties of the SWCNT as it is wetted by an analyte. Wetting of the inside of the SWCNT by water turns the transistor on, while wetting of the outside has little effect. These observations are consistent with theoretical simulations that show that internal water both generates a large dipole electric field, causing charge polarization of the tube and metal electrodes, and shifts the valence band of the SWCNT, while external water has little effect. This finding may provide a new method to investigate water behavior at nanoscale. This also opens a new avenue for building sensors in which the SWCNT simultaneously functions as a concentrator, nanopore, and extremely sensitive electronic detector, exploiting the enhanced sensitivity of the interior surface.
KW - biosensor
KW - carbon nanotube
KW - nanoconfinement
KW - nanofluidics
KW - nanopore
KW - water in nanoscale channels
UR - http://www.scopus.com/inward/record.url?scp=79955409912&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79955409912&partnerID=8YFLogxK
U2 - 10.1021/nn200251z
DO - 10.1021/nn200251z
M3 - Article
C2 - 21452854
AN - SCOPUS:79955409912
VL - 5
SP - 3113
EP - 3119
JO - ACS Nano
JF - ACS Nano
SN - 1936-0851
IS - 4
ER -