Bistable electrical switching and electronic memory effect in a solution-processable graphene oxide-donor polymer complex

Liu, Gang; Zhuang, Xiaodong; Chen, Yu; Zhang, Bin; Zhu, Jinhui; Zhu, Chunxiang; Neoh, K. G.; Kang, En‐Tang

doi:10.1063/1.3276556

Cited by 125 publications

(113 citation statements)

References 25 publications

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“…This advantages would be every useful in fabricating the methanol sensor in DMFC. The rGO/PPy composite electrode shows larger specific capacitance, higher rate performance, and better charge-discharge stability [10]. The rGO/PPy composite also provide large surface area which increases the binding sites [11].…”

Section: -2506mentioning

confidence: 95%

Structural Study of Reduced Graphene Oxide/Polypyrrole Composite as Methanol Sensor in Direct Methanol Fuel Cell

Hassan

Kamarudin²,

Loh³

2016

MJAS

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Density functional theory (DFT) computations were performed on the optimized geometric and electronic properties of reduced graphene oxide/polypyrrole (rGO/PPy) composite in comparison with pure graphene and graphene oxide structures. Incorporation of both reduced GO (rGO) and PPy will form a good composite which have advantages from both materials such as good mechanical strength and excellent electrical conductivity. These composite would be very suitable in fabrication of methanol sensor in direct methanol fuel cell (DMFC). The HOMO-LUMO energy (eV) was also calculated. These computational calculations provide a theoretical explanation for the good performance of rGO/PPy composite as electrode materials in methanol sensor.Keywords: graphene, structure, polypyrrole, direct methanol fuel cell, density functional theory Abstrak Pengiraan teori fungsi ketumpatan (DFT) telah dilakukan ke atas ciri-ciri optimum geometri dan elektronik oksida komposit grafin terturun/polipirol (rGO/PPy) berbanding dengan grafin tulen dan grafin oksida. Gabungan kedua-dua GO terturun (rGO) dan PPy akan membentuk komposit yang baik yang mempunyai kelebihan dari kedua-dua bahan seperti kekuatan mekanikal dan kekonduksian elektrik yang sangat baik. Komposit ini menjadi sangat sesuai dalam pembuatan sensor metanol dalam sel bahan api metanol langsung (DMFC). Tenaga HOMO-LUMO (eV) juga telah dikira. Pengiraan ini memberikan penjelasan teori untuk prestasi baik rGO/PPy komposit sebagai bahan elektrod dalam sensor metanol.Kata kunci: grafin, struktur, polipirol, sel bahan api metanol langsung, teori fungsi ketumpatan Introduction Direct Methanol Fuel Cell (DMFC) is a potential device as a source of mobile power which provides advantages such as high energy density, low pollution, fast starting time, lightweight and more compact compare to rechargeable battery and other types of fuel cells. It is also easy to use. DMFC is capable of converting chemical energy directly between the reaction of methanol and oxidant (air or oxygen) into electrical energy [1,2]. The overall reaction for methanol oxidation is given as Eq. 1 below [3]:

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Section: -2506mentioning

confidence: 95%

Structural Study of Reduced Graphene Oxide/Polypyrrole Composite as Methanol Sensor in Direct Methanol Fuel Cell

Hassan

Kamarudin²,

Loh³

2016

MJAS

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“…In comparison, BRS provides more uniformity, higher resistivity, and lower switching voltage whereas URS has higher ON/OFF ratio of resistance states. 9 In quest of future generation ReRAM memory, several materials such as polymers, [10][11][12][13] carbon-based materials, 14,15 rare earth oxides, [16][17][18] various perovskite-type oxides structures 19,20 and transitional metal oxides 21,22 etc. are being studied.…”

confidence: 99%

Enhanced bipolar resistive switching behavior in polar Cr-doped barium titanate thin films without electro-forming process

Thakre

Kumar

2017

AIP Advances

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An enhanced, repeatable and robust resistive switching phenomenon was observed in Cr substituted BaTiO3 polar ferroelectric thin films; fabricated and deposited by the sol-gel approach and spin coating technique, respectively. An enhanced bistable bipolar resistive switching (BRS) phenomenon without electro-forming process, low switching voltage (∼ 2 V) and moderate retention characteristics of 104 s along with a high Roff/Ron resistance ratio ∼103 was achieved. The current conduction analysis showed that the space charge limited conduction (SCLC) and Schottky emission conduction dominate in the high voltage range, while thermally active charge carriers (ohmic) in the lower voltage range. The impedance spectroscopy study indicates the formation of current conducting path and rupturing of oxygen vacancies during SET and RESET process.

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“…7 In our previous work, we designed a series of D-A-type functional polymers. [8][9][10][11][12][13][14][15][16][17][18][19] The device based on conjugated poly[9,9-bis(4-diphenylaminophenyl)-2,7-fluorene] donors covalently bridged with Disperse Red 1 acceptors (DR1-PDPAF-DR1) exhibited an accessible rewritable memory characteristic. 10,17 The excitation of donor promoted CT to the conjugated channel, finally the electrons were at LUMO1 or further at LUMO2 and gave rise to a conductive charge separation state.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and memory performance of a conjugated polymer with an integrated fluorene, carbazole and oxadiazole backbone

Zeng

Liu

Zhang

et al. 2011

Polym J

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A new soluble conjugated polymer, poly[{9-(4-methoxyphenyl)-9H-carbazole}(9,9-dioctylfluorene)(2,5-diphenyl-1,3,4-oxadiazole)] (PCFO), was synthesized through the Suzuki coupling reaction. The absolute fluorescence quantum yield of PCFO was measured using the integrating sphere of a photoluminescence spectrofluorometer, and changed from 49.1% for a dilute tetrahydrofuran solution to 16.2% for a thin film due to the existence of a strong fluorescence quenching effect in the solid state. The HOMO-LUMO bandgap (3.07 eV) calculated from the electrochemical measurement is nearly identical to the optical bandgap (3.06 eV) estimated from the ultraviolet/visible absorption onset data. This film was attached to aluminum and indium-tin oxide contacts to fabricate a memory device with typical bistable electrical switching, nonvolatile write-once read-many-times memory performance, a turn-on voltage of BÀ2.3 V and an ON/OFF ratio of B10 5 . Degradation of the current density was observed for neither the ON nor OFF states after one hundred million continuous read cycles, which indicates that both states were insensitive to read cycles. Keywords: donor-acceptor system; molecular devices; polymer memory; synthesis INTRODUCTIONPolymer memories are proposed to revolutionize electrical applications by providing extremely inexpensive, lightweight and transparent modules that can be fabricated onto plastic, glass or the top layer of CMOS hybrid integration circuits, 1,2 and have been identified as an emerging memory technology by the International Technology Roadmap for Semiconductors since year 2005. 3 Rather than encoding '0'and '1' as a charge stored in the cell of a silicon device, polymer memory stores data in an entirely different form, such as in a highand low-conductivity response to an applied voltage. 4 The molecular structure of polymers can be tailored by functionalizing them with electron donors (D) and acceptors (A) of different strengths, spacer moieties of different steric effects for the electroactive pendant groups, or nanostructured electroactive materials, to induce different memory behaviors in simple metal/polymer/metal devices. 5,6 Very recently, Liu and Chen 7 highlighted the recent developments in D-A polymers for resistive switching memory device applications including conjugated polymers, functional polyimides, nonconjugated pendent polymers and polymer composites. D/A polymer materials (usually carbazole or

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Bistable electrical switching and electronic memory effect in a solution-processable graphene oxide-donor polymer complex

Cited by 125 publications

References 25 publications

Structural Study of Reduced Graphene Oxide/Polypyrrole Composite as Methanol Sensor in Direct Methanol Fuel Cell

Structural Study of Reduced Graphene Oxide/Polypyrrole Composite as Methanol Sensor in Direct Methanol Fuel Cell

Enhanced bipolar resistive switching behavior in polar Cr-doped barium titanate thin films without electro-forming process

Synthesis and memory performance of a conjugated polymer with an integrated fluorene, carbazole and oxadiazole backbone

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