Nanometer-scale recording on an organic-complex thin film with a scanning tunneling microscope

P., L.; Song, Yekai; Gao, Hanfei; Zhao, Weidong; Chen, H. Y.; Xue, Zheng; Pang, Shengyang

doi:10.1063/1.117181

Cited by 51 publications

(11 citation statements)

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“…It has been observed that a conformational change of molecules can cause dramatic changes of the physical properties and the corresponding device properties [2][3][4][5][6][7][8][9]. In a number of experiments it was demonstrated how the molecular conductance in organic thin films changes due to structural transitions, induced by electrostatic fields [10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Electrostatic field effect on molecular structures at metal surfaces

Guo

Zhang

et al. 2009

Surface Science

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Section: Introductionmentioning

confidence: 99%

Electrostatic field effect on molecular structures at metal surfaces

Guo

Zhang

et al. 2009

Surface Science

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“…Organic materials exhibiting bistable conductance switching have been extensively investigated due to their potential applications for data storage 1, 2. A wide range of materials, including conjugated polymers,3–8 oligomers,9, 10 small organic molecules,11–20 and blends of nanoparticles in an organic host21–23 have been reported for electrical switching and memory effects. In particular, organic donor – acceptor (D – A) molecules, due to their ability to exhibit electrical bistability and versatility in molecular design, have received considerable attention 24–26.…”

Section: Introductionmentioning

confidence: 99%

Improving the ON/OFF Ratio and Reversibility of Recording by Rational Structural Arrangement of Donor–Acceptor Molecules

Cao

et al. 2010

Adv Funct Materials

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Organic molecules with donor–acceptor (D–A) structure are an important type of material for nanoelectronics and molecular electronics. The influence of the electron donor and acceptor units on the electrical function of materials is a worthy topic for the development of high‐performance data storage. In this work, the effect of different D–A structures (namely D–Π–A–Π–D and A–Π–D–Π–A) on the electronic switching properties of triphenylamine‐based molecules is investigated. Devices based on D–Π–A–Π–D molecules exhibit excellent write–read–erase characteristics with a high ON/OFF ratio of up to 106, while that based on A–Π–D–Π–A molecules exhibit irreversible switching behavior with an ON/OFF ratio of about (3.2 × 101)–(1 × 103). Moreover, long retention time of the high conductance state and low threshold voltage are observed for the D–A switching materials. Accordingly, stable and reliable nanoscale data storage is achieved on the thin films of the D–A molecules by scanning tunneling microscopy. The influence of the arrangement of the D and A within the molecular backbone disclosed in this study will be of significance for improving the electronic switching properties (ON/OFF current ratio and reversibility) of new molecular systems, so as to achieve more efficient data storage through appropriate design strategies.

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“…Following this general concept a variety of polymer fibers were prepared for a variety of different applications including templates for nanotubes, electrical conductivity, photocatalysis, drug delivery, etc. [18] The present work describes the processing of core±shell nano-/mesofibers by co-electrospinning of two materials. Compound capillary liquid±liquid jets of Newtonian, nonpolymeric fluids were first introduced in relation to ink-jet printing.…”

Section: Methodsmentioning

confidence: 99%

Nanoscale Data Recording on an Organic Monolayer Film

Song

et al. 2003

Advanced Materials

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The electrochemical measurements were conducted using a three-electrode cell at 25 C. A Pt wire and an Ag/AgCl (in saturated KCl) were used as the counter and reference electrodes, respectively. The carbon working electrode was polished with 1, 0.3, and 0.05 lm Al 2 O 3 paste, and washed ultrasonically in Millipore water (18 MX cm). The working electrode was brushed with a catalyst ink as described previously [14]. Solutions of 0.5 M H 2 SO 4 and 2.0 M CH 3 OH in 0.5 M H 2 SO 4 were stirred constantly and purged with nitrogen gas. All chemicals used in this study were of analytical grade. The electrochemical experiments were performed using an AUTOLAB (Eco Chemie). Voltammetry was performed over the potential range~0.1±0.6 V versus NHE (NHE = normal hydrogen electrode) to identify the properties of the Pt-based catalyst in H 2 SO 4 .For a membrane-electrode assembly (MEA) of DMFC, the anode (supported catalysts prepared using hollow graphitic nanoparticles or commercial catalyst) and cathode (Pt black, Johnson-Matthey) catalyst layers were formed on teflonized carbon paper (TGPH-090) substrates using catalyst inks containing the appropriate weight percent of a Nafion ionomer solution (Aldrich). The MEA for unit cell tests were fabricated by pressing the as-prepared cathode and anode layers onto both sides of a pre-treated Nafion 117 electrolyte membrane at 110 C and 800 psi (= 5.5 MPa) for 3 min. The membrane was pretreated by boiling in 3 wt.-% H 2 O 2 for 1 h followed by 0.5 M H 2 SO 4 for 1 h. The cell performance was evaluated in a DMFC unit cell with a 2 cm 2 cross-sectional area, and was measured using a potentiometer (WMPG-3000), which recorded the cell under a constant current. Both the fuel and oxidant flow paths were machined into graphite block end plates, which also served as the current collectors. The cell temperature was maintained using the heating lines embedded into each cell housing. A 2 M methanol solution with a flow rate of 1 cm 3 min ±1 was supplied using a Maxterflex liquid micropump and a dry O 2 flow was regulated at 500 cm 3 min ±1 using a flow meter. Widely acknowledged as a critical technology in the development of information technology, nanometer-scale data recording has been thoroughly explored.[1±8] Virtually all the factors that may improve the technology have received much attention.[9±13] The choice of medium used when utilizing scanning tunneling microscope (STM) in ultra-high-density information storage is, doubtlessly, a worthy topic; [14] a good medium makes the process cheaper, more predictable, and more easily manipulated. Due to their controllable molecular structures, low price, and abundant supply, organic functional materials have long attracted scientists' attention. Yet, in traditional methods, these materials usually depend on tetracyanoquinodimethane (TCNQ)±metal charge-transfer complexes, [15±17] in which organic molecules are used as electron acceptors and metals are used as electron donors. The problem of these organic± COMMUNICATIONS

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Nanometer-scale recording on an organic-complex thin film with a scanning tunneling microscope

Cited by 51 publications

References 0 publications

Electrostatic field effect on molecular structures at metal surfaces

Electrostatic field effect on molecular structures at metal surfaces

Improving the ON/OFF Ratio and Reversibility of Recording by Rational Structural Arrangement of Donor–Acceptor Molecules

Nanoscale Data Recording on an Organic Monolayer Film

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