Conjugated‐Polymer‐Functionalized Graphene Oxide: Synthesis and Nonvolatile Rewritable Memory Effect

Zhuang, Xiaodong; Chen, Yu; Liu, Gang; Li, Peipei; Zhu, Chunxiang; Kang, En‐Tang; Noeh, Koon-Gee; Zhang, Bin; Li, Yongxi

doi:10.1002/adma.200903469

Cited by 406 publications

(242 citation statements)

References 30 publications

Supporting

Mentioning

234

Contrasting

Unclassified

Order By: Relevance

“…One of the approaches for improving the solubility of the graphene material is to modify GO by using a chemical method. [59][60][61] For example, Zhuang et al 62 demonstrated a single-layer hybrid bistable memory containing GO sheets covalently grafted with soluble conjugated polymer triphenylamine-based polyazomethine (TPAPAM). The device was fabricated by using a simple spincoating technique, and the TPAPAM-GO-based memory device exhibited typical bistable electrical switching and a nonvolatile rewritable memory effect, with a turn-on voltage of about À1 V and an ON/OFF current ratio of about 10 3 .…”

Section: Electrical Memory Devicesmentioning

confidence: 99%

Electrical memory devices based on inorganic/organic nanocomposites

Kim

Yang²,

et al. 2012

NPG Asia Mater

168

110

View full text Add to dashboard Cite

Nonvolatile memory devices based on hybrid inorganic/organic nanocomposites have emerged as excellent candidates for promising applications in next-generation electronic and optoelectronic devices. Among the various types of nonvolatile memory devices, organic bistable devices fabricated utilizing hybrid organic/inorganic nanocomposites have currently been receiving broad attention because of their excellent performance with high-mechanical flexibility, simple fabrication and low cost. The prospect of potential applications of nonvolatile memory devices fabricated utilizing hybrid nanocomposites has led to substantial research and development efforts to form various kinds of nanocomposites by using various methods. Generally, hybrid inorganic/organic nanocomposites are composed of organic layers containing metal nanoparticles, semiconductor quantum dots (QDs), core-shell semiconductor QDs, fullerenes, carbon nanotubes, graphene molecules or graphene oxides (GOs). This review article describes investigations of and developments in nonvolatile memory devices based on hybrid inorganic/organic nanocomposites over the past 5 years. The device structure, fabrication and electrical characteristics of nonvolatile memory devices are discussed, and the switching and carrier transport mechanisms in the hybrid nonvolatile memory devices are reviewed. Furthermore, various flexible memory devices fabricated utilizing hybrid nanocomposites are described and their future prospects are discussed.

show abstract

Section: Electrical Memory Devicesmentioning

confidence: 99%

Electrical memory devices based on inorganic/organic nanocomposites

Kim

Yang²,

et al. 2012

NPG Asia Mater

168

110

View full text Add to dashboard Cite

show abstract

“…This type of modification has a special interest in the dispersion of functionalized GO in different solvents (polar or non-polar), this is due to the fact that the family of silanes provide a wide range of terminal functional groups. The functionalization of GO via carboxylic acids is one of the most common approaches and is possible by prior activation of these groups through various agents such as thionyl chloride (SOCl 2 ) (Niyogi, Bekyarova et al 2006;Liu, Xu et al 2009;Zhang, Huang et al 2009;Karousis, Economopoulos et al 2010;Zhuang, Chen et al 2010), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) (Liu, Robinson et al 2008), N, N'-dicyclohexylcarbodiimide (DCC) (Veca, Lu et al 2009) and 2-(7-aza-1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (Hatu) (Mohanty and Berry 2008). Subsequent addition of nucleophilic species, such as amines and hydroxyl, allow the formation of covalent bonds with functional groups of the graphene oxide through formation of amide or ester groups.…”

Section: Covalent Functionalizationmentioning

confidence: 99%

Functionalized Graphene Nanocomposites

Marques¹,

Gonçalves²,

Cruz³

et al. 2011

Advances in Nanocomposite Technology

View full text Add to dashboard Cite

“…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%

“…14 TPA-based conjugated polyazomethine covalently grafted with graphene oxide (TPAPAM-GO) was directly used to fabricate nonvolatile rewritable memory devices. 11 Electrons transmitted from the HOMO of the hole-transporting polymer TPAPAM into LUMO of graphene layer by intramolecular CT interaction established charge transport pathways and switched the device from the OFF to ON state. The effective electron delocalization in graphene nanosheets might stabilize the CT state of TPAPAM-GO, leading to a nonvolatile nature.…”

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

Self Cite

View full text Add to dashboard Cite

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

show abstract

Conjugated‐Polymer‐Functionalized Graphene Oxide: Synthesis and Nonvolatile Rewritable Memory Effect

Cited by 406 publications

References 30 publications

Electrical memory devices based on inorganic/organic nanocomposites

Electrical memory devices based on inorganic/organic nanocomposites

Functionalized Graphene Nanocomposites

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

Contact Info

Product

Resources

About