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Featured researches published by Pei Pang.


Science | 2010

Translocation of Single-Stranded DNA through Single-Walled Carbon Nanotubes

Haitao Liu; Jin He; Jinyao Tang; Hao Liu; Pei Pang; Di Cao; Predrag S. Krstic; Sony Joseph; Stuart Lindsay; Colin Nuckolls

Carbon Nanotube Bridge for DNA Transport The nanoporosity of carbon nanotubes has been exploited in the control of molecular transport—for example, in creating membranes. Liu et al. (p. 64) fabricated devices in which one single-walled carbon nanotube connects two fluid reservoirs. In some of these devices, apparently those in which the nanotube is metallic, the ionic conductivity is anomalously higher than that expected from the bulk resistivity of the electrolyte. This high conductivity was exploited for the transport of single-stranded DNA, which was accompanied by large but transient increases in the ion current. Transfer of DNA by electrophoresis through some carbon nanotubes is accompanied by giant current pulses. We report the fabrication of devices in which one single-walled carbon nanotube spans a barrier between two fluid reservoirs, enabling direct electrical measurement of ion transport through the tube. A fraction of the tubes pass anomalously high ionic currents. Electrophoretic transport of small single-stranded DNA oligomers through these tubes is marked by large transient increases in ion current and was confirmed by polymerase chain reaction analysis. Each current pulse contains about 107 charges, an enormous amplification of the translocated charge. Carbon nanotubes simplify the construction of nanopores, permit new types of electrical measurements, and may open avenues for control of DNA translocation.


ACS Nano | 2011

Origin of Giant Ionic Currents in Carbon Nanotube Channels

Pei Pang; Jin He; Jae Hyun Park; Predrag S. Krstic; Stuart Lindsay

Fluid flow inside carbon nanotubes is remarkable: transport of water and gases is nearly frictionless, and the small channel size results in selective transport of ions. Very recently, devices have been fabricated in which one narrow single-walled carbon nanotube spans a barrier separating electrolyte reservoirs. Ion current through these devices is about 2 orders of magnitude larger than predicted from the bulk resistivity of the electrolyte. Electroosmosis can drive these large excess currents if the tube both is charged and transports anions or cations preferentially. By building a nanofluidic field-effect transistor with a gate electrode embedded in the fluid barrier, we show that the tube carries a negative charge and the excess current is carried by cations. The magnitude of the excess current and its control by a gate electrode are correctly predicted by the Poisson-Nernst-Planck-Stokes equations.


ACS Nano | 2013

Optical and Electrical Detection of Single-Molecule Translocation through Carbon Nanotubes

Weisi Song; Pei Pang; Jin He; Stuart Lindsay

Ion current through a single-walled carbon nanotube (SWCNT) was monitored at the same time as fluorescence was recorded from charged dye molecules translocating through the SWCNT. Fluorescence bursts generally follow ion current peaks with a delay time consistent with diffusion from the end of the SWCNT to the fluorescence collection point. The fluorescence amplitude distribution of the bursts is consistent with single-molecule signals. Thus each peak in the ion current flowing through the SWCNT is associated with the translocation of a single molecule. Ion current peaks (as opposed to blockades) were produced by both positively (Rhodamine 6G) and negatively (Alexa 546) charged molecules, showing that the charge filtering responsible for the current bursts is caused by the molecules themselves.


ACS Nano | 2014

Fixed-Gap Tunnel Junction for Reading DNA Nucleotides

Pei Pang; Brian Ashcroft; Weisi Song; Peiming Zhang; Sovan Biswas; Quan Qing; Jialing Yang; Robert J. Nemanich; Jingwei Bai; Joshua T. Smith; Kathleen B. Reuter; Venkat K. Balagurusamy; Yann Astier; Gustavo Stolovitzky; Stuart Lindsay

Previous measurements of the electronic conductance of DNA nucleotides or amino acids have used tunnel junctions in which the gap is mechanically adjusted, such as scanning tunneling microscopes or mechanically controllable break junctions. Fixed-junction devices have, at best, detected the passage of whole DNA molecules without yielding chemical information. Here, we report on a layered tunnel junction in which the tunnel gap is defined by a dielectric layer, deposited by atomic layer deposition. Reactive ion etching is used to drill a hole through the layers so that the tunnel junction can be exposed to molecules in solution. When the metal electrodes are functionalized with recognition molecules that capture DNA nucleotides via hydrogen bonds, the identities of the individual nucleotides are revealed by characteristic features of the fluctuating tunnel current associated with single-molecule binding events.


ACS Nano | 2011

Electronic Sensitivity of Carbon Nanotubes to Internal Water Wetting

Di Cao; Pei Pang; Jin He; Tao Luo; Jae Hyun nmn Park; Predrag S. Krstic; Colin Nuckolls; Jinyao Tang; Stuart Lindsay

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.


Journal of Physics: Condensed Matter | 2010

Translocation events in a single-walled carbon nanotube

Jin He; Hao Liu; Pei Pang; Di Cao; Stuart Lindsay

Translocation of DNA oligomers through a single walled carbon nanotube was demonstrated recently. Translocation events are accompanied by giant current pulses, the origin of which remains obscure. Here, we show that introduction of a nucleotide alone, guanosine triphosphate into the input reservoir of a carbon nanotube nanofluidic also gives giant current pulses. Taken together with data on oligomer translocation, theses new results suggest that pulse width has a non-linear, power-law dependence on the number of nucleotides in a DNA molecule. We have also measured the time for the onset of DNA translocation pulses after bias reversal, finding that the time for the onset of translocation is directly proportional to the period of bias reversal.


Nanotechnology | 2012

Electronic sensitivity of a single-walled carbon nanotube to internal electrolyte composition

Di Cao; Pei Pang; Hao Liu; Jin He; Stuart Lindsay

Carbon nanotubes (CNTs) are well known as materials for nanoelectronics and show great potential to be used as the sensing elements in chemical and biological sensors. Recently, CNTs have been shown to be effective nanofluidic channels and the transport of substances through small diameter CNTs is intrinsically fast, selective, and operates at the single molecule level. It has been shown that the transport characteristics of semiconducting single-walled CNT (SWCNT) field effect transistors (FETs) are sensitive to internal water wetting. We report here that the characteristics of semiconducting SWCNT FETs are also sensitive to the concentration, pH and ion type of the ionic solution when the electrolyte is inside the CNT. Such sensitivity is not observed at the outside surface of a semiconducting SWCNT. This opens a new avenue for building new types of CNT sensor devices in which the SWCNT concurrently functions as a nanochannel and an electronic detector.


Archive | 2013

SYSTEMS AND DEVICES FOR MOLECULE SENSING AND METHOD OF MANUFACTURING THEREOF

Brett Gyarfas; Stuart Lindsay; Pei Pang


ChemElectroChem | 2018

Probing Dynamic Events of Dielectric Nanoparticles by a Nanoelectrode‐Nanopore Nanopipette

Popular Pandey; Namuna Panday; Shuai Chang; Pei Pang; Javier Garcia; Xuewen Wang; Qiang Fu; Jin He


Nano Futures | 2017

Observation of giant conductance fluctuations in a protein

Bintian Zhang; Weisi Song; Pei Pang; Yanan Zhao; Peiming Zhang; István Csabai; Gábor Vattay; Stuart Lindsay

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Stuart Lindsay

Arizona State University

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Jin He

Florida International University

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Di Cao

Arizona State University

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Hao Liu

Arizona State University

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Peiming Zhang

Arizona State University

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Weisi Song

Arizona State University

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Jinyao Tang

University of Hong Kong

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Brett Gyarfas

Arizona State University

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