Nanometre-scale recording and erasing with the scanning tunnelling microscope

Sato, Atsushige; Tsukamoto, Yuji

doi:10.1038/363431a0

Cited by 74 publications

(26 citation statements)

References 15 publications

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“…[2,4,7,8] The nanocables were fabricated by laser ablation, [9] polymerization of monomers on a template, [8] and growing a semiconductor nanowire inside the polymer tubules. [10] Nano-and mesocables made of polymer±metals and polymer±polymer (conducting polyalkylthiophenes) were also obtained by the TUFT-process (tubes by fiber templates).…”

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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Section: Methodsmentioning

confidence: 99%

Nanoscale Data Recording on an Organic Monolayer Film

Song

et al. 2003

Advanced Materials

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“…To increase the storage density, various recording schemes have been explored. Among them, scanning tunnel microscopy (STM) [1] for achieving maximal areal density and two-photon excitation (TPE) [2] for recording information in multiple layers, are considered as two kinds of the most attractive technologies. Furthermore, the development of novel recording medium is another critical factor to achieve high density storage.…”

Section: Ultrahigh Density Information Storage With Organic Thin Filmsmentioning

confidence: 99%

Organic optical/electrical functional thin films

Song

2010

10th IEEE International Conference on Nanotechnology

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Organic functional thin films have recently attracted considerable attention due to their potential applications in molecular photonic and electronic devices. In this work, we report our recent achievements in design and synthesis of new organic optical/electrical functional thin films toward ultrahigh density data storage, as well as the fabrication of tough polymer photonic crystals and the development of its applications in different fields.

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“…[28,[38][39][40][41] In this paper, we show that the structural bistability exists for single H2 rotaxane molecules on a buffer-layered solid surface and that the structure transition is accompanied by conductance switching at 77 K. We also achieved the reversible writing and erasing of information dots on solid-state H2 rotaxane films at room temperature. STM is employed in our experiments as it has been proved to be a powerful tool not only for manipulating intramolecular structure and local measurement of electronic states [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] but also for inducing local conductance transition on functional thin films to realize nanoscale recording. [8][9][10][11][12][13]25] Ab initio and molecular mechanics (MM) calculations are employed to explain the transition mechanism.…”

Section: Introductionmentioning

confidence: 99%

Observation of Structural and Conductance Transition of Rotaxane Molecules at a Submolecular Scale

Feng

Gao

et al. 2007

Adv Funct Materials

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Rotaxane molecules have attracted considerable interest because of their good performance in both molecular electronic devices and nanoscale data‐storage media. Low‐temperature scanning tunneling microscopy is used to investigate the structure and conductance of single H2 rotaxane molecules on a buffer‐layered Au(111) substrate at 77 K. It is demonstrated that the conductance switching in rotaxane‐based, solid‐state devices is an inherent property of the rotaxane molecules. These results provide evidence that the conductance switching might arise from the movement of the cyclobis(paraquat‐p‐phenylene) ring along the rod section of the dumbbell‐shaped backbone of the rotaxane molecule.

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Nanometre-scale recording and erasing with the scanning tunnelling microscope

Cited by 74 publications

References 15 publications

Nanoscale Data Recording on an Organic Monolayer Film

Nanoscale Data Recording on an Organic Monolayer Film

Organic optical/electrical functional thin films

Observation of Structural and Conductance Transition of Rotaxane Molecules at a Submolecular Scale

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