Wubiao Duan

• Beijing Jiaotong University

An effective manipulation of polaron pairs (PPs) for realizing amplified magneto-photocurrent (AMPC) is of critical importance toward the development of low power consumption and high-performance organic spin-optoelectronic devices, for instance magneto-photo-volatile memories. By far, it is challenging and there is a lack of method to reach AMPC....

In this work, the two-dimensional self-assembly and co-assembly behaviors of two tetracarboxylic acid derivatives (H4BDETP and H4BTB) were investigated by scanning tunneling microscopy (STM). H4BDETP molecules self-assembled into linear nanostructures, and H4BTB molecules formed lamellar and tetragonal nanostructures. The formation of a H4BDETP/H4B...

Anisotropic organic magnetoresistance (AOMR) is unlikely and challenging to detect in organic semiconductors, because of their energetic disorder character and random molecular arrangements in solid films. Nevertheless, some fused-ring electron acceptor (FREA)-based organic bulk heterojunctions (BHJs) exhibit decent molecular growth modes, which ma...

Since magnetic fields can probe fractions of spin singlet and triplet at charge-transfer states (CTSs) for organic bulk heterojunction (BHJ) solar cells, this makes the magneto-photocurrent (MPC) a powerful and versatile method to unravel the photovoltaic spin-dynamics. The method is of paramount importance for deeply understanding the spin-depende...

The self-assembled behavior of an unsymmetric molecule (BCDTDA) with one imidazole group as center and benzoic acid group as functional group is studied, and the regulatory behaviors of coronene (COR) and three bipyridine derivatives (named BP, PEBP-C4 and PEBP-C8) on BCDTDA self-assembly structures are also investigated. Based on highly oriented p...

Nonfullerene acceptors (NFAs) are potential candidates for high-performance organic solar cells. As a group of promising organic optoelectronic materials, it is of particular importance to further explore while establishing their novel functionalities for other critical applications such as low power consumptions and high-speed organic spintronic d...

The prediction of two-dimensional molecular self-assembly structures has always been a problem to be solved. The molecules with meta-dicarboxyl groups can self-assemble into a specific hexagonal cavity, which has an important influence on the prediction of molecular self-assembly structures and the application of functional molecules with meta-dica...

Macrocyclicself-assemblies havegained great interest for the diversified structures and potential applications, such as catalysis, magnetism, photovoltaic devices, organic lightemitting diodes. Macrocycles can present regularassembly systems at the liquid/solid interface due to the π-conjugated structures. Furthermore, suitable guest molecules can...

Manipulation of the co‐catalyst plays a vital role in charge separation and reactant activation to enhance the activity of metal‐organic framework‐based photocatalysts. However, clarifying and controlling co‐catalyst related charge transfer process and parameters are still challenging. Herein, three parameters are proposed, Vtransfer (the electron...

Here, the selective adsorption behaviors of guest molecule COR in two hexamer host grids were investigated by means of scanning tunnelling microscope (STM). The assembled structures of small functional organic molecules TTBTA and TATBA were thermodynamically stable. Interestingly, the introduction of the guest molecule COR destroyed the original he...

A new kind of low symmetric aromatic tetra-carboxylic acids H4BCPIA molecules self-assembled and were regulated by two kinds of pyridine derivatives on the heptanoic acid/HOPG interface. H4BCPIA molecule self-assembled into dimers as basic units through meta-carboxyl groups and formed into networks with quadrilateral cavities. With the participatio...

Scanning tunneling microscopy (STM) was utilized to disclose four novel core-modified rubyrin self-assembly behaviors on highly-oriented pyrolytic graphite (HOPG) surface, of which N2S4-OR(1)/N2Se4-OR(2) had no phenanthrene pyrrole ring and N2S4-OR(3)/N2Se4-OR(4) had phenanthrene fused pyrrole rings and meso-aryl substituents. It was discovered tha...

Crystal defects have been regarded as the recombination centers of excitons for photocatalysts and, normally, they are removed via additional chemical modifications. Herein, the defects were found to be efficiently utilizable, due to their superior noble metal confine abilities. A unit mass of defects-abundant photocatalyst (DA–NH2–MIL-125) showed...

“Ship-in-bottle” strategy used for encapsulating small metal clusters into metal-organic frameworks (MOFs) has been well established in the past decades, whereas immobilizing shape-controllable metal nanocrystals’ (MNCs) which was expected to show “shape effects” in catalysis remains as a challenging work. Herein, by the new developed pore-expandin...

In this study, two kinds of C3-symmetric hexacarboxylic acids containing three pairs of meta-carboxyl groups self-assemble into similar flower structures with two different sizes type cavities. The bi- and tri-component...

Supramolecular self-assembly is an important strategy in nanotechnology and surface science, which has attracted extensive attention in the past decades. In this field, how to obtain more diverse two-dimensional structures and make them more stable has always been a huge challenge. Scanning Tunneling Microscope (STM), with atomic resolution, is a u...

The rational design and adequate control of structures of molecular building blocks plays an im-portant role in the fabrication of desired supramolecular nano-structures at interfaces. In this study, the formation of a pure hydrogen-bonding co-assembly supramolecular nano-network on a highly oriented pyrolytic graphite (HOPG) surface was demonstrat...

Aromatic carboxylic acid self-assembly has been a hot research field for many scientists due to its strong coordination ability and flexible coordination mode. The hydrogen bond formed between aromatic carboxylic acids is a strong intermolecular force and has directionality and saturation, which plays a very important role in the self-assembly and...

Molecular devices are one of the most advanced research fields of nanotechnology, while the construction of molecular nanostructures is an important part of the preparation of molecular devices. The nanoporous supramolecular network is assembled by non-covalent forces such as hydrogen bonds, van der Waals interactions, and coordination bonds. Scann...

Inhibiting the recombination of electron–hole pairs of TiO2-based photocatalysts to enhance the photocatalytic activities received continuous attention in the past decades. Herein, a ternary composite of TiO2/UiO-66-NH2/graphene oxide was designed to facilitate the photoelectrons transfer. When –NH2 was grafted, graphene oxide was introduced by 0.0...

Porphyrins and phthalocyanines are currently a prevalent topic with great potential due to their abundant photonic/electronic properties. The study of porphyrin or phthalocyanine supramolecular architectures on solid surfaces is laying the foundation for the further development of molecular electronics or other structures in applications. Above all...

The arrangement of oligothiophenes is essential for understanding the relationship between structure and properties particularly in the organic electronic field. The self-assembly behaviors of helical (TMS)2-[7]helicene (T1), naphthalene-cored double (TMS)2-[7]helicene (T2), and saddle-shaped cyclooctatetrathiophene (T3), its derivative α,α,α,α-tet...

Host-guest chemistry in two-dimensional (2D) networks has gained much interest for the new functionalities and potential applications, such as separation technology, photogenic crystals and biomimetic surfaces. Nanoporous supramolecular networks are assembled by a range of non-covalent forces like hydrogen bonds, van der Waals interactions and coor...

Inhibiting the recombination of electron and holes plays an essential role in photocatalytic process, particularly for MOFs which had long been expected as high efficient photocatalysts. Herein, we introduce a new strategy to make efficient separation of electron and holes for MOFs-based photocatalyst, UiO-66-NH2. At first, encapsulate Pt NPs into...

In this investigation, the two-dimensional (2D) self-assembly nanostructures of a series of cyclic oligo(phenylene-ethynylene) (OPE) molecules (L1, L2-6 and L2-12) at 1-phenyloctane/highly oriented pyrolytic graphite (HOPG) interface were thoroughly studied using scanning tunneling microscopy( STM). Comparative STM studies with their triangular Pt(...

SiO2/P25 (SP) composites doped with different contents of cerium were prepared by a hydrothermal process at a relatively low temperature in this experiment. The resulting Ce–SiO2/P25 (CSP) composites were successfully characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high resolutio...

The nanostructures of a series of conjugated oligo(p-phenylene-ethynylene)s (OPE) adsorbed on a surface were thoroughly studied using scanning tunneling microscopy (STM). These oligomers have different backbone lengths and side chains. As a result, various nanostructures displaying periodic linear patterns at a single molecule level were obtained....

New environmentally friendly alkaline bricks were produced with the utilization of industrial residues (alkaline residue and fly ash) as main resources and novel combination of calcium stearate as an addition. By adjusting the ratio of alkaline residue and fly ash, reducing the water cement ratio, the flexural and compressive strengths of the alkal...

Zinc(ii) phthalocyanine (ZnPc) is a promising photosensitizer for PDT but suffers from aggregation in a physiological aqueous environment. In this paper, a class of biocompatible polymeric nanoparticles (NPs) was prepared to encapsulate ZnPc molecules. Mostly because of the planar structure, ZnPc molecules were difficult to be encapsulated into the...

In the present investigation, we reported the fabrication of host networks formed by two newly prepared phenanthrene-butadiynylene macrocycles (PBMs) at the liquid-solid interface. Size, shape and concentration controlled experiments have been performed to investigate the PBMs/coronene (COR) host-guest system with the structural polymorphism phenom...

The commercially available TiO2 Degussa P25 was modified using a simple technique to produce a visible-light-actived indium and carbon doped P25 catalyst. The modified photocatalysts have been successfully obtained by thermal heating method. These as-obtained products were successfully characterized by X-ray diffraction (XRD), X-ray photoelectrion...

This paper aims to solve the problem of the reversibility in carbonation/calcination cycles of Ca-based materials. The CaO/CaZrO3 hollow sphere sorbents were prepared using colloidal carbon spheres as a template via the co-adsorption method. The hollow structure sorbents, which contained two kinds of metal ions, were observed by scanning electron m...

Hollow spheres Al2O3 was successfully synthesized via a simple template method and used to catalyze a new process from methyl vinyl ether to propylene. In this study, it not only indicated that a two-step integration process from acetylene and methanol to propylene is feasible but also could adjust the distribution of the products by the prepared c...

Cu-P25-graphene nanocomposite was fabricated through hydrothermal method at relatively low temperature. The technique used is P25-graphene (PG) binary composite was firstly prepared by P25 and graphite oxide (GO), and then Cu2+ ions were impregnated into PG composite. The prepared samples were characterized by X-ray diffraction (XRD), X-ray photoel...

Triethylene glycol (TEG)-substituted 4-(N-methyl-N-Boc-amino)styrylpyridine, which can serve as key precursor for many monodentate and multidentate imaging agents for Aβ plaques in the human brain, has been readily synthesized with cheap starting materials. Our new method could be employed for mass production of monodentate imaging agent AV-45 and...

In the present investigation, we reported the fabrication of a chicken-wire porous 2D network formed by triphenylene-2,6,10-tricarboxylic acid (H3TTCA) at the liquid-solid interface. When coronene (COR) molecules were added into the system, the H3TTCA honey-comb network was broken and the reconstructed structures of the H3TTCA/COR host-guest system...

The ZSM-5 zeolite is widely used to catalyze the reactions of methanol to olefins. Herein, we have prepared the H-ZSM-5 doped with barium (Ba/ZSM-5) using incipient wetness impregnation method. The Ba modified catalysts were used to catalyze a new reaction of methanol with methyl vinyl ether to improve the selectivity of ethylene and propylene (C2=...

In the present investigation, we report the fabrication of flexible binary network formed by tetraacidic azobenzene (NN4A) and trans-1,2-bis(4-pyridyl)ethylene (DPE) at the liquid-solid interface. When coronene (COR) molecule is added into these systems, the binary networks break and the reconstruction structures of NN4A/COR host-guest systems are...

The efficient photochemical reactions on surface are of great importance to its potential applications in optoelectronic devices. In this work, a high efficient photodimerization reaction of one olefin cocrystal built by two trans-1,2-Bis(4-pyridyl)ethylenes(4,4’-bpe) and two isophthalic acids molecules via N…H―O hydrogen bonds in between was achie...

This paper describes a system for the synthesis of Cu-doped mesoporous TiO 2 nanoparticles by a hydrothermal method at relatively low temperatures. The technique used is to dope the as-prepared mesoporous TiO 2 system with copper. In this method, the copper species with the form of Cu 1+ , which was attributed to the reduction effect of dehydroxyla...

The self-assembling behaviour of two kinds of 4-carboxyphenoxy phthalocyanines (Pc1 and Pc2) has been investigated by scanning tunneling microscope (STM). Pc1 and Pc2 are isomers with the same substituent at alpha- andbeta-position of the phthalocyanine core, respectively. Our STM results have shown that the Pc1 molecule fabricates into stable netw...

A promising approach to create functional nanoarrays is supramolecular self-assembly at liquid-solid interfaces. In the present investigation, we report on the self-assembly of phthalocyanine arrays using triphenylene-2,6,10-tricarboxylic acid (H3TTCA) as a molecular nanotemplate. Five different metastable arrays are achieved in the study, includin...

Nanoscaled two-dimensional (2D) chiral architectures are increasingly receiving scientific interest because of their potential applications in many domains. In this paper, we present a new method for constructing 2D chiral architectures on surface. Based on in situ Schiff-base reaction of achiral dialdehyde with two kinds of achiral amines at the s...

A nickel(II)-azo dye was synthesized in order to obtain a suitable optical recording medium for write-once blu-ray recording with low-to-high signal polarity. Smooth thin film of the nickel(II)-azo dye was prepared by spin-coating method. Absorption, reflectance spectra and optical constants (complex refractive indices N=n+ik) of the thin film were...

PEGged! A series of mono-PEGylated zinc(II) phthalocyanines for photodynamic therapy with singlet oxygen have been prepared and formulated in aqueous media with different methods. The system based on silica nanoparticles exhibits remarkably high stability and in vitro photocytotoxicity.

A general functionalization strategy was reported, which enables one to conjugate saccharide(SA) on gold nanoparticle(GNP) surface without affecting SA properties. First, disulfide phenylboronic acid(Bor) functionalized GNPs(Bor@GNPs) were synthesized by the reaction of citrate stabilized GNPs of 13 nm in diameter with the mixture of Bor and pentap...

Spin-coating films of tetra-(tert-butyl)-5,10,15,20-tetraazaporphyrin copper (CuTAP(t-Bu)4) and tetra-(tert-butyl) phthalocyanine copper (CuPc(t-Bu)4) was obtained and characterized by absorption spectra and atomic force microscopy. The gas sensing behaviors of the films were investigated with respect to NH3 and NO2 at room temperature. In addition...

Spin-coated films of 1,4,8,11,15,18,22,25-octa-iso-pentyloxyphthalocyanine lead (PbPc(iso-PeO)8) complex were obtained and characterized by IR spectra, UV–vis absorption spectra. A good linear relationship of the absorbance and solution concentration was detected. Low concentration solution could afford smooth, homogeneous and porous macrostructure...

Treatment of 4,5-dichlorophthalonitrile with 2-(dimethylamino)ethanethiol hydrochloride and K(2)CO(3) afforded 4,5-bis[2-(dimethylamino)ethylthio]phthalonitrile or a heterocycle-fused phthalonitrile depending on the reaction temperature. The latter has been spectroscopically and structurally characterized. Both compounds underwent mixed cyclization...

The phthalocyanine salt [ZnPc(NMe3)4]I4 was synthesized from 4-nitrophthalonitrile using a three-step procedure. The interaction of [ZnPc(NMe3)4]4+ with calf thymus DNA (CT DNA) has been investigated by UV-vis and fluorescence spectrometric methods. [ZnPc(NMe3)4]4+ exists in a non-monomeric form, proposed to be a dimer, in phosphate buffer solution...

Films with alternating layers containing anionic tetracarboxylic copper phthalocyanine [CuPc(COONa)4] and cationic polydiallydimethylammonium chloride (PDDA) were fabricated by electrostatic self-assembled layer-by-layer (LBL) technique. The delicate structure of the film was characterized by a series of techniques. The third-order nonlinear optica...

The ultrafast third-order nonlinear optical properties of Zn Pc ( O Bu ) 6 ( NCS ) /dimethyl sulfoxide solution are investigated by optical Kerr effect (OKE) and pump–probe techniques with femtosecond pulses. Using C S 2 as the reference, the third-order susceptibility of the sample solution is obtained as about 1.40 × 10 − 14 esu at a concentratio...

Multilayer films containing anionic iron phthalocyanine tetrasulfonate (FePcTsNa4) and cationic poly(diallydimethyl ammonium chloride) were prepared using electrostatic self-assembled layer-by-layer technique. The growth of the film was monitored by ultraviolet–visible absorption spectroscopy, and the morphology of the film was characterized by ato...

A novel nanoscopic composite film with alternating layers consisting of anionic octacarboxylic cobalt phthalocyanine [CoPc(COONa)8] and cationic polyethylenimine (PEI) has been fabricated by an electrostatic, layer-by-layer, self-assembly technique. UV-vis spectroscopy revealed consecutive regular deposition of CoPc(COONa)8/PEI onto a quartz slide....

An ultrathin composite film with alternating layers containing anionic octacarboxylic copper phthalocyanine [CuPc(COONa)8] and cationic polyethylenimine (PEI) has been prepared by the electrostatic layer-by-layer self-assembly technique. The alternating multilayer assemblies of CuPc(COONa)8/PEI were characterized by UV–Vis spectroscopy, showing the...

Optical limiting [OL] property of naphthalocyanine zinc [ZnNc] in DMSO solution was first studied with 30 Ps laser pulses at the wavelength of 532 nm. For comparison, OL measurement of C60 was performed under the same experimental conditions. The results indicate that the optical limiting ability of ZnNc is similar to that of C60. To investigate th...

A series of novel zinc(II) phthalocyanines mono-substituted with a 1,3-bis(dimethylamino)-2-propoxy group at the alpha- or beta-position, and the corresponding di-N-methylated derivatives, have been synthesized. All these compounds can generate singlet oxygen effectively and exhibit high in vitro photodynamic activities toward HT29 human colorectal...

Monoamino substituted asymmetrical phthalocyanine zinc(II), 2-amino-9,10,16,17,23,24-hexapentyloxy phthalocyanine zinc(II), was synthesized by statistical condensation and characterized by elemental analysis, UV-Vis, IR and TOF-MS. The aggregative behavior was studied in DMF, THF and CH 2Cl 2. The results show that it is not aggregateve in DMF and...

Two near IR emitting fluorophores, based on the phthalocyanine and naphthalocyanine chromophores, which also bear a single isothiocyanato group suitable for conjugation to proteins are reported; their utility as luminescent probes is demonstrated by conjugation to monoclonal antibodies and the ability of these conjugates to selectively bind cells b...

Phthalocyanine substituted by eight trioxyethylenemonomethylethers (EOPc) was prepared, and the solvent effect on the polymerization has been studied at 25.0 °C through absorption and emission spectroscopies. EOPc is soluble in a wide range of solvents from water to nonpolar solvents because of the amphiphilic property of the compound. EOPc predomi...

The formation and protonation of the complexes of a series of ethylenedinitrilopoly(methylphosphonic acids) (EDMP) [(Me) 2-p(H 2O 3PCH 2) p NC 2H 4N(Me) 2-q(CH 2PO 3 H 2) q, p = 0-2, q = 1-2] with divalent transition metal ions (M = Mn 2+, Co 2+, Ni 2+, Cu 2+, Zn 2+ or Cd 2+) were investigated by means of potentiometry and 31P NMR spectroscopy at 2...

The formation and protonation of the complexes of acids N(CH2COOH)3 − r(CH2PO3H2)r, r = 1 (H4ndamp) or 2 (H5nadmp), with the alkaline-earth metal ions (M = Mg2+, Ca2+, Sr2+ or Ba2+) and the divalent transition metal ions (M = Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+ or Cd2+) have been investigated by means of potentiometry and 31P NMR spectroscopy at 25...

The formation and protonation of the complexes of a series of ethylenedinitrilopoly(methylphosphonic acids) (edmp) [(H2O3PCH2)2-pMepNC2H4NMeq(CH2PO3H2)2-q; p, q = 0–2] with the alkaline-earth metal ions (M = Mg2+, Ca2+, Sr2+ or Ba2+) have been investigated by means of potentiometry and 31P NMR spectroscopy at 25.0 °C. The complex formation and prot...

The coherence time measurement of 23ps, 532nm Nd:YAG pulses using counter-running pump-probe technique in the reverse saturable absorption material of lead phthalocyanine was studied. The measured coherence time 9ps is small compared with the laser pulse width. It is demonstrated that two beam coherent effect increases the reverse saturable absorpt...