Bistable electrical switching and nonvolatile memory effects by doping different amounts of GO in poly(9,9-dioctylfluorene-2,7-diyl)

Xin, Ying; Zhao, Xiaofeng; Jiang, Xiankai; Yang, Qun; Huang, Jiahe; Wang, Shuhong; Zheng, Rongrong; Wang, Cheng; Hou, Yanjun

doi:10.1039/c8ra00029h

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…FTIR (cm –1 ): 3055 (stretch C–H thiophene ring); 2953, 2924, 2853 (C–H stretches associated with saturated hydrocarbons); 1607, 1571, 1465 (stretch CC fluorene ring); 1309 (angular deformation of the C–H fluorene ring); 1124 (angular deformation of the fluorene ring); 823 (C–H out-plane angular deformation of the fluorene ring); 719 (deformation C–S–C). − …”

Section: Resultsmentioning

confidence: 99%

Langmuir and Langmuir–Blodgett Films of Poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] for Immobilization of Phytase: Possible Application as a Phytic Acid Sensor

2020

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In this work, the copolymer poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] was employed as a matrix for immobilizing phytase, aiming at the detection of phytic acid. The copolymer was spread on the air–water interface forming Langmuir monolayers and phytase adsorbed from the aqueous subphase. The interactions between the copolymer and the enzyme components were investigated with surface pressure and surface potential–area isotherms, Brewster angle microscopy, and polarization modulation infrared reflection–absorption spectroscopy (PM-IRRAS). The enzyme could be incorporated in the monolayers from the aqueous subphase, expanding the copolymer films and maintaining its secondary structure. The polymeric films presented a morphological heterogeneous pattern at the air–water interface because of the ability of their chains to fold and entangle, causing inherent defects in the organization as well as unbalanced lateral distribution at the air–water interface because of the formation of aggregates. The interfacial films were transferred to solid supports as Langmuir–Blodgett films and characterized by PM-IRRAS and scanning electronic microscopy, which showed not only the co-transfer of the enzyme but also the maintenance of their heterogeneous morphological pattern. The enzymatic activity of the blended film was analyzed by UV–vis spectroscopy and allowed the estimation of the value of the Michaelis constant (13.08 mM), demonstrating the feasibility of the system to selectively detect phytic acid for biosensing purposes.

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Section: Resultsmentioning

confidence: 99%

Langmuir and Langmuir–Blodgett Films of Poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] for Immobilization of Phytase: Possible Application as a Phytic Acid Sensor

2020

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“…As can be seen from Figure 7 , the thickness of the BPC-2DPx and BPC-2DPP films were 119.9 nm and 143.6 nm, respectively. The thin film is beneficial for the injection of holes and electrons during electrical storage [ 41 , 42 ]. The flatness of the top electrode also influences the performance of the device.…”

Section: Resultsmentioning

confidence: 99%

“…The device performance is highly correlated with the surface morphology of the organic semiconducting active layer [ 42 , 43 ]. To investigate the surface root mean square roughness (RMS) of the films, atomic force microscopy (AFM) measurements were carried out on the BPC-2DPx and BPC-2DPP films.…”

Section: Resultsmentioning

confidence: 99%

“…In this case, the hole injection barriers for both of the two devices are much lower than those of the electron injection barriers. Therefore, both organic layers have the p-type property, and the hole injection process dominates the writing and erasing process of the devices [ 41 , 42 , 43 , 44 ]. In D–A–D compounds, the electron acceptor cloud functions as carrier traps.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Pyrazine Derivatives and Substituted Positions on the Photoelectric Properties and Electromemory Performance of D–A–D Series Compounds

Song

Kong

et al. 2018

Materials

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Pyrazine derivatives quinoxaline and pyridopyrazine were selected as the acceptors, and benzocarbazole was used as the donor to synthesize four different D–A–D compounds. The results showed that 2,3-bis(decyloxy)pyridine[3,4-b]pyrazine (DPP) exhibited stronger electron-withdrawing ability than that of 2,3-bis(decyloxy)quinoxaline (DPx), because DPP possesses one more nitrogen (N) atom, resulting in a red-shift of the intramolecular charge transfer (ICT) absorption bands and fluorescent emission spectra for compounds with DPP as the acceptor compared with those that use DPx as the acceptor. The band-gap energy (Eg) of the four D–A–D compounds were 2.82 eV, 2.70 eV, 2.48 eV, and 2.62 eV, respectively, for BPC-2DPx, BPC-3DPx, BPC-2DPP, and BPC-3DPP. The solvatochromic effect was insignificant when the four compounds were in the ground state, which became significant in an excited state. With increasing solvent polarity, a 30–43 nm red shift was observed in the emissive spectra of the compounds. The thermal decomposition temperatures of the four compounds between 436 and 453 °C had very high thermal stability. Resistor-type memory devices based on BPC-2DPx and BPC-2DPP were fabricated in a simple sandwich configuration, Al/BPC-2DPx/ITO or Al/BPC-2DPP/ITO. The two devices showed a binary non-volatile flash memory, with lower threshold voltages and better repeatability.

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“…In recent years, besides pure polymer materials, scientific researchers have also extensively studied polymer/inorganic nanocomposites in RRAM. [ 15,16 ] In previous studies, most of the composite storage devices showed good performance. The polymer/inorganic nanocomposite‐based memory devices not only retain the excellent properties of polymer‐based memory devices, but also possess the unique electrical performance of inorganic nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Ternary Memory Behavior of Carbazole‐Based Donor–Acceptor Polymer and CdS NPs Composites

Dou

Zhao

Gao

et al. 2022

Macro Chemistry & Physics

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Multi-level memory can greatly improve information density, so it has been widely studied. In this study, a carbazole-based donor-acceptor polymer poly[2,7-9-(heptadecan-9-yl)-9H-carbazole-alt-7H-benzimidazo[2,1a]benz[de]isoquinolin-7-one] (PCz-BB) is synthesized, which exhibits flash-type ternary memory behavior. Further, CdS nanoparticles (NPs) are embedded into the prepared polymer to enhance the storage performance. The current-voltage (I-V) characteristics of memory devices based on PCz-BB:CdS composites and the effect of the embedding ratio of CdS NPs on the memory devices are studied. It is verified that the ON2/ON1/OFF current ratios of the devices at low CdS embedding concentrations are improved, and the threshold voltages are also reduced. The memory device based on the optimal embedding concentration (3 wt% CdS) exhibits a high ON2/ON1/OFF current ratio of 18631:72:1, a low threshold voltage of −0.40/−1.20 V, and excellent stability. The mechanism of resistive switching is explained by the theory of charge traps and conductive filaments. This work provides a new avenue for high-performance multi-level organic electrical storage materials.

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Bistable electrical switching and nonvolatile memory effects by doping different amounts of GO in poly(9,9-dioctylfluorene-2,7-diyl)

Abstract: The device shows different conductive behavior: electric bistable nonvolatile flash memory behavior and conductor behavior.

Cited by 8 publications

References 31 publications

Langmuir and Langmuir–Blodgett Films of Poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] for Immobilization of Phytase: Possible Application as a Phytic Acid Sensor

Langmuir and Langmuir–Blodgett Films of Poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] for Immobilization of Phytase: Possible Application as a Phytic Acid Sensor

Effects of Pyrazine Derivatives and Substituted Positions on the Photoelectric Properties and Electromemory Performance of D–A–D Series Compounds

Ternary Memory Behavior of Carbazole‐Based Donor–Acceptor Polymer and CdS NPs Composites

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