Structure and Transport Properties of the Charge-Transfer Salt Coronene−TCNQ

Chi, X.; Besnard, Céline; Thorsmolle, VK; Butko, VY; Taylor, A. J.; Siegrist, T.; Ramirez, A. P.

doi:10.1021/cm049187+

Cited by 72 publications

(87 citation statements)

References 22 publications

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“…4 A and B after dipping into a solution of the well known electron acceptor TCNQ. Given the affinity of TCNQ for the molecules such as coronene (32), it likely acts as a dopant for the stacks by accepting -electrons through charge transfer between the electron-deficient TCNQ and the electron-rich HBC. This result would explain the shift in voltage threshold to more positive values and why the OFFcurrent becomes higher by Ϸ1 order of magnitude.…”

Section: Resultsmentioning

confidence: 99%

Chemoresponsive monolayer transistors

Guo

Myers²,

Xiao³

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

148

167

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This work details a method to make efficacious field-effect transistors from monolayers of polycyclic aromatic hydrocarbons that are able to sense and respond to their chemical environment. The molecules used in this study are functionalized so that they assemble laterally into columns and attach themselves to the silicon oxide surface of a silicon wafer. To measure the electrical properties of these monolayers, we use ultrasmall point contacts that are separated by only a few nanometers as the source and drain electrodes. These contacts are formed through an oxidative cutting of an individual metallic single-walled carbon nanotube that is held between macroscopic metal leads. The molecules assemble in the gap and form transistors with large current modulation and high gate efficiency. Because these devices are formed from an individual stack of molecules, their electrical properties change significantly when exposed to electron-deficient molecules such as tetracyanoquinodimethane (TCNQ), forming the basis for new types of environmental and molecular sensors.chemistry ͉ electronic materials ͉ nanoscience ͉ self-assembly T his work details a method to make chemoresponsive transistors by making devices out of a monolayer of polycyclic aromatic hydrocarbons that are chemically attached to surfaces. The devices are formed through a self-assembly process of organic semiconductors on the oxide surface of a silicon wafer (Fig. 1A) (1, 2). Previous studies on organic field-effect transistors (OFETs) (3, 4) have shown that the path for electrical current is through at most the first few layers of molecules at the oxide interface (5-7). In general, when the semiconducting layers of typical OFETs are scaled down to a monolayer, their properties become poor, presumably due to discontinuities or defects in the films (8-11). The strategy used here circumvents this problem by a chemical functionalization of the molecular semiconductors ( Fig. 1B) so that they both assemble laterally and chemically attach themselves to the substrate (Fig. 1C). The important result is that when ultrasmall point contacts separated by molecular length-scales are used as the source and drain (S͞D) electrodes, transistors can be made that have high gate efficiency and large ON͞OFF ratios from only a monolayer of molecules. The electrical properties of these monolayers are responsive to electron acceptors such as tetracyanoquinodimethane (TCNQ). Results and DiscussionDevice Fabrication. We first describe the devices used to measure the properties of the monolayers and then the structural and electrical characterization of these monolayers. Fig. 2 shows a schematic and micrograph of the devices used. Au (50 nm) on Cr (5 nm) pads, which are separated by 20 m, form the contact to an individual single-walled carbon nanotube (SWNT). The nanotubes were grown by a chemical vapor deposition (CVD) process described elsewhere (12, 13). The nanotube is then oxidatively cut by using an ultrafine lithographic process that produces a very small gap between the nan...

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Section: Resultsmentioning

confidence: 99%

Chemoresponsive monolayer transistors

Guo

Myers²,

Xiao³

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

148

167

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“…[6][7][8][9] Previous attempts to grow similar materials involved the use of solvents. Solvent inclusions are disadvantageous in semiconductor applications.…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth, Structure, and Electronic Band Structure of Tetracene−TCNQ

et al. 2007

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. September 12, 2006; In Final Form: December 6, 2006 We have grown the charge-transfer salt of the electron acceptor 7,7,8, and the electron donor tetracene using physical vapor transport. The crystal structure was solved by singlecrystal X-ray diffraction and the symmetry was found to be triclinic (space group P1 h). The 1:1 complex grows by alternating face to face stacking of tetracene and TCNQ molecules. Calculations on the electronic band structure show that the tetracene-TCNQ complex is an indirect band gap semiconductor and provide insight in the conductive properties of tetracene-TCNQ.

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“…2,3-di-O-methyl cellulose (DOMC) was prepared according to the literature 15 and analyzed by gel permeation chromatography (GPC) which showed a monomodal peak (M n = 27190, M w /M n = 3.12). 2,3-di-O-methyl cellulose (DOMC) was prepared according to the literature 15 and analyzed by gel permeation chromatography (GPC) which showed a monomodal peak (M n = 27190, M w /M n = 3.12).…”

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confidence: 99%

Biocompatible organic charge transfer complex nanoparticles based on a semi-crystalline cellulose template

Nagai

Miller

et al. 2015

Chem. Commun.

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Using a bio-inspired cellulose template, new charge transfer (CT) nanoparticles (NPs) with unique and intriguing emission properties are reported. Pyrene-modified 2,3-di-O-methyl cellulose formed CT complexes with small molecule acceptors, e.g. 7,7,8,8-tetracyanoquinodimethane (TCNQ), and exhibited aggregation-induced emission (AIE) in aqueous medium upon nanoparticle formation. The TCNQ-CT NPs showed multicolor fluorescence emissions at 370-400 nm, 602 nm and 777 nm, when excited at 330 nm, 485 nm and 620 nm respectively. The cellulose-TCNQ NPs are biocompatible and demonstrate an advance in the use of the CT mechanism for biomedical imaging applications both in vitro and in vivo.

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Structure and Transport Properties of the Charge-Transfer Salt Coronene−TCNQ

Cited by 72 publications

References 22 publications

Chemoresponsive monolayer transistors

Chemoresponsive monolayer transistors

Crystal Growth, Structure, and Electronic Band Structure of Tetracene−TCNQ

Biocompatible organic charge transfer complex nanoparticles based on a semi-crystalline cellulose template

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