Data storage with 0.7 nm recording marks on a crystalline organic thin film by a scanning tunneling microscope

P., L.; Yang, Wu; Xue, Zheng; Pang, Shengyang

doi:10.1063/1.122022

Cited by 31 publications

(18 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The organic electrical bistable device, which usually shows a transition from a high-impedance state to a low-impedance state under an electrical field, have been studied for more than 30 years. [5][6][7][8][9] However, high performance and reliable organic memory devices have not yet emerged, particularly because most organic bistable phenomena to date result from the formation of a conducting filament or an electrical breakdown, which has limited these devices from many applications.…”

mentioning

confidence: 99%

Organic bistable light-emitting devices

Liu

Pyo

et al. 2002

Applied Physics Letters

116

View full text Add to dashboard Cite

An organic bistable device, with a unique trilayer structure consisting of organic/metal/organic sandwiched between two outmost metal electrodes, has been invented. ͓Y. Yang, L. P. Ma, and J. Liu, U.S. Patent Pending, U.S. 01/17206 ͑2001͔͒. When the device is biased with voltages beyond a critical value ͑for example 3 V͒, the device suddenly switches from a high-impedance state to a low-impedance state, with a difference in injection current of more than 6 orders of magnitude. When the device is switched to the low-impedance state, it remains in that state even when the power is off. ͑This is called ''nonvolatile'' phenomenon in memory devices.͒ The high-impedance state can be recovered by applying a reverse bias; therefore, this bistable device is ideal for memory applications. In order to increase the data read-out rate of this type of memory device, a regular polymer light-emitting diode has been integrated with the organic bistable device, such that it can be read out optically. These features make the organic bistable light-emitting device a promising candidate for several applications, such as digital memories, opto-electronic books, and recordable papers.

show abstract

mentioning

confidence: 99%

Organic bistable light-emitting devices

Liu

Pyo

et al. 2002

Applied Physics Letters

116

View full text Add to dashboard Cite

show abstract

“…[55] Alternatively, one component may be polymeric, such as the donor PVK which is used as a host for rare-earth complexes as acceptor. [56] In other cases the D-A species are coupled into one molecule [57] or onto the backbone of a copolymer. [58][59][60] In all of these systems the assumption is frequently that charge-transfer to the conductive state can be driven by an electric field, and indeed negative differential resistance (but not bistability) has been observed in mixed-stack D-A complexes selected to be near the neutral-ionic transition.…”

Section: Reviewmentioning

confidence: 99%

Nonvolatile Memory Elements Based on Organic Materials

2007

View full text Add to dashboard Cite

Many organic electronic devices exhibit switching behavior, and have therefore been proposed as the basis for a nonvolatile memory (NVM) technology. This Review summarizes the materials that have been used in switching devices, and describes the variety of device behavior observed in their charge–voltage (capacitive) or current–voltage (resistive) response. A critical summary of the proposed charge‐transport mechanisms for resistive switching is given, focusing particularly on the role of filamentary conduction and of deliberately introduced or accidental nanoparticles. The reported device parameters (on–off ratio, on‐state current, switching time, retention time, cycling endurance, and rectification) are compared with those that would be necessary for a viable memory technology.

show abstract

“…The I±V experimental result is consistent with our previous speculation that the recording mechanism was due to charge transfer in the recorded regions. [24,26] The coexistence of strong electron accepter, ±NO 2 , and donor, ±N(CH 3 ) 2 , in the molecule suggests that electron delocalization may be induced by charge transfer in the recorded region in the thin film. Generally, charge transfer includes both intramolecular and intermolecular transfer.…”

Section: Nanoscale Data Recording On An Organicmentioning

confidence: 98%

“…We also demonstrated ultra-high-density data storage in the NBPDA system. [24] Like PNBN, NBPDA is not suitable for use data recording: it is not stable enough to serve as a recording medium. In order to avoid the defects of the above materials, we have designed and synthesized the other new organic material N,N¢-dimethyl-N¢(3-nitrobenzylidene)-p-phenylene-diamine (DMNBPDA, see the molecular formula below), which is a molecule with a strong electron donor, ±N(CH 3 ) 2 , and an electron accepter, ±NO 2 , and more stable than NBPDA (the donor ±NH 2 of NBPDA, which is sensitive to air, is protected by two ±CH 3 groups, and the melting point of DMNBPDA is raised to 172 C, 26 C higher than that of NBPDA).…”

Section: Nanoscale Data Recording On An Organicmentioning

confidence: 99%

Nanoscale Data Recording on an Organic Monolayer Film

Song

et al. 2003

Advanced Materials

View full text Add to dashboard Cite

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

show abstract

Data storage with 0.7 nm recording marks on a crystalline organic thin film by a scanning tunneling microscope

Abstract: Using a new kind of organic complex system of electrical bistability for ultrahigh density data storage

Cited by 31 publications

References 8 publications

Organic bistable light-emitting devices

Organic bistable light-emitting devices

Nonvolatile Memory Elements Based on Organic Materials

Nanoscale Data Recording on an Organic Monolayer Film

Contact Info

Product

Resources

About