Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays

Nanjing, China

Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays

Nanjing, China
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Cai X.,Nanjing University of Posts and Telecommunications | Shi L.,Nanjing University of Posts and Telecommunications | Liu X.,Nanjing University of Posts and Telecommunications | Liu X.,Key Laboratory for Organic Electronics and Information Displays KLOEID | And 8 more authors.
Progress in Chemistry | Year: 2013

Conjugated polymers with large, delocalized molecular structure have been widely used in the field of organic electronics, biological and/or chemical sensing, diagnosis and bioimaging due to their unique optical absorption and emission characteristics. Conjugated polymers functionalized by special groups, such as glycosyl, biotin, carboxyl, amino acid, peptide, nucleic acid, antibody, amino, thiol and so on, have ability to recognize certain biomolecules or heavy metal ions. Here, we review the recent development of functionalized conjugated polymer and their application in the biological and/or chemical analysis on the basis of functional groups of different types. Methods for functionalization of conjugated polymers, the application in the detection of proteins, pathogens, Hg2+ and Pb2+, and future development of this area are also included.


Xia X.,Nanjing University of Posts and Telecommunications | Xia X.,Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays | Liu X.,Nanjing University of Posts and Telecommunications | Yi M.,Nanjing University of Posts and Telecommunications | And 9 more authors.
Journal of Physics D: Applied Physics | Year: 2012

A nonvolatile write-once-read-many-times (WORM) memory device based on the ITO/poly(N-vinylcarbazole) (PVK)/SiO 2 nanoparticles (SiO 2 NPs)/PVK/Al structure is demonstrated. By employing SiO 2 NPs, the ON/OFF current ratio of the device is enlarged from 20 to 7×10 2 at a low voltage, and the device shows obvious negative differential resistance (NDR) phenomenon at a high electric field. Compared with the ITO/PVK/Al and ITO/PVK/PVK/Al devices, it is found that the size of the SiO 2 NPs sandwiched between two PVK layers plays an important role in enhancing the reproducibility and the ON state retention time of the WORM memory device. The WORM memory mechanisms of the device are investigated on the basis of the currentvoltage (I-V) characteristics and scanning electron microscopy image. Here, the strength of the NDR effect in our devices is only related to the charge defects and traps of PVK films, and it can be enlarged by embedding charge traps into the PVK films. © 2012 IOP Publishing Ltd.


Shi W.,Nanjing University of Posts and Telecommunications | Shi W.,Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays | Tai Q.,Nanjing University of Posts and Telecommunications | Xia X.-H.,Nanjing University of Posts and Telecommunications | And 8 more authors.
Chinese Physics Letters | Year: 2012

Al/ZnO/P ++-Si diodes exhibit typical unipolar resistive switching behaviors. The electroforming-free characteristics are observed after annealing the ZnO thin film at 400°C in air. The ON/OFF ratios of the resistance are in the range of 10 4-10 5 at a very low operation voltage of 0.1 V, and the devices show good endurance characteristics of over 400 cycles with negligible reduction. Finally, the memory mechanisms of the diodes are proposed on the basis of the current-voltage and resistance-voltage results. These results indicate that Al/ZnO/P ++-Si devices have potential applications in nonvolatile memory devices. © 2012 Chinese Physical Society and IOP Publishing Ltd.


Lin Z.-Q.,Nanjing University of Posts and Telecommunications | Lin Z.-Q.,Nanyang Technological University | Lin Z.-Q.,Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays | Sun P.-J.,Nanjing University of Posts and Telecommunications | And 15 more authors.
ACS Nano | Year: 2012

Figure Persented: Nonplane molecules with multiple large aromatic planes could be promising candidates to form various polyhedral micro/nanocrystals by manipulating the different π⋯π stacking, tuning the cohesive energies of crystal facets, and controlling the kinetic growth process. Spirocyclic aromatic hydrocarbons (SAHs) not only have two cross-shaped aromatic planes but also offer the feature of supramolecular steric hindrance, making it favorable for the heterogeneous kinetic growth into highly symmetric polyhedra. Herein, we report that a novel SAH compound, spiro[fluorene-9,7′- dibenzo[c,h]acridine]-5′-one (SFDBAO), can self-assemble into various monodispersed shapes such as hexahedra, octahedra, and decahedra through the variation of either different types of surfactants, such as Pluronic 123 (P123) and cetyltrimethyl ammonium bromide (CTAB), or growth parameters. In addition, the possible mechanism of crystal facet growth has been proposed according to the SEM, XRD, TEM, and SAED characterization of organic polyhedral micro/nanocrystals. The unique cruciform-shaped SAHs have been demonstrated as fascinating supramolecular synthons for various highly symmetric polyhedral assembling. © 2012 American Chemical Society.


Zhao F.,Nanjing University of Posts and Telecommunications | Zhao F.,Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays | Liu J.,Nanjing University of Posts and Telecommunications | Liu J.,Nanyang Technological University | And 18 more authors.
ACS Nano | Year: 2012

We report a green and efficient method for chemoselective deoxidization of graphene oxide via the ultraviolet irradiation catalyzed with 2,2,6,6-tetramethyl-4-piperidinol. While the sp 2-hybridized oxygen functional groups are removed after the reduction, the epoxy and hydroxyl groups are retained in the chemoselectively reduced graphene oxide (CrGO). The obtained CrGO nanosheets exhibit the high solubility and excellent electronic stability, which allows for the fabrication of thin film devices through a solution processing. As a proof of concept, a CrGO-based write-once-read-many- times memory device with the desirable stability and long-time operation is fabricated. © 2012 American Chemical Society.


Shi H.,Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays | Shi H.,Nanjing University of Posts and Telecommunications | Shi H.,National University of Singapore | Liu S.,Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays | And 11 more authors.
Macromolecular Bioscience | Year: 2013

A hybrid complex composed of an anionic conjugated polyelectrolyte (PFB-SO3Na) and a cationic phosphorescent Ir(III) oligomer is formed through electrostatic interaction by simple physical mixing in aqueous media. Due to their opposite charges and their effective spectral overlap, fluorescence resonance energy transfer occurs from the blue-emissive PFB-SO3Na to the red-emissive phosphorescent Ir(III) complex, which allows ratiometric and colorimetric Hg2+ sensing in aqueous solution with good selectivity, sensitivity, as well as visible detection. Time-resolved photoluminescence is applied for Hg2+ detection, which can effectively eliminate the background interference and improve the sensing sensitivity and signal-to-noise ratio in complicated media. An anionic conjugated polyelectrolye and a cationic phosphorescent Ir(III) complex form a hybrid probe for ratiometric Hg2+ sensing with good selectivity and low detection limit. Time-resolved photoluminescence is further applied to eliminate the interference from background fluorescence, which opens new opportunities for Hg2+ sensing in complex media. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Lin J.,Nanjing University of Posts and Telecommunications | Lin J.,Jiangsu Singapore Joint Research Center for Organic Bio Electronics and Information Displays | Yu Z.,Central China Normal University | Zhu W.,Nanjing University of Posts and Telecommunications | And 9 more authors.
Polymer Chemistry | Year: 2013

The supramolecular approach of π-conjugated polymers imparts excellent self-assembly behaviour to construct organogels and simultaneously affords superstructured thin films, which allow for uncovering structure-function relationships. Herein, a polyfluorene-based poly(tertiary alcohol), poly(9-(4-(octyloxy)phenyl)-2,7-fluoren-9-ol) (PPFOH), has been synthesized to investigate the organic solvent effect on the gelation at room temperature. The driving force of hydrogen bonding and π-π stacking interactions in the aggregate processing of PPFOH has been investigated using nuclear magnetic resonance (NMR), dynamic light scattering (DLS), and photoluminescence (PL). Aggregated structures of PPFOH in gelation solvents have been correlated with the characteristic emission peak at 440 nm in PL spectra. Large effects of the number molecular weight (Mn) on critical gel concentration (CGC) and green emissions of the organogels and nanostructured thin films have been observed. Finally, the emission colour of PPFOH from supramolecular thin films can be tuned flexibly from blue to yellow via selecting different types of solvent and Mn, which are promising approaches to control the optoelectronic functionalities of supramolecular π-conjugated polymers with potential applications in organic thin film electronics, optoelectronics and mechano-electronics. © 2013 The Royal Society of Chemistry.

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