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Zhou, Ye
Alternative names
Publications (8 of 8) Show all publications
Yang, Y., Zhang, J., Zhou, Y., Zhao, G., He, C., Li, Y., . . . Zhang, F. (2010). Solution-Processable Organic Molecule with Triphenylamine Core and Two Benzothiadiazole-Thiophene Arms for Photovoltaic Application. JOURNAL OF PHYSICAL CHEMISTRY C, 114(8), 3701-3706
Open this publication in new window or tab >>Solution-Processable Organic Molecule with Triphenylamine Core and Two Benzothiadiazole-Thiophene Arms for Photovoltaic Application
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2010 (English)In: JOURNAL OF PHYSICAL CHEMISTRY C, ISSN 1932-7447, Vol. 114, no 8, p. 3701-3706Article in journal (Refereed) Published
Abstract [en]

A new solution-processable biarmed organic molecule With triphenylamine (TPA) core and benzothiadiazole-hexylthiophene (BT-HT) arms, B(TPA-BT-HT), has been synthesized by a Heck reaction, and characterized by UV-vis absorption, cyclic voltammetry, and theoretical calculation. Photovoltaic properties of B(TPA-BT-HT) as light-harvesting and electron-donating material in organic solar cells (OSCs), with [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM) as acceptors, were systematically investigated. The performance of the OSCs varied significantly with B(TPA-BT-HT)/fullerene weight ratio, active layer thickness, and solvents Used For spin-coating the active layer. The optimized device with the B(TPA-BT-HT)/PC70BM weight ratio of 1:2 and a thickness of 55 nm with the active layer spin-coated from DCB solution Shows a power conversion efficiency of 1.96% with a short-circuit current density of 5.50 mA/cm(2) and in open-circuit voltage of 0.96 V under (lie illumination of AM 1.5, 100 mw/cm(2).

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-54395 (URN)10.1021/jp910836t (DOI)000274842700053 ()
Available from: 2010-03-12 Created: 2010-03-12 Last updated: 2010-03-12
Gedefaw, D., Zhou, Y., Hellstrom, S., Lindgren, L., Andersson, L., Zhang, F., . . . Andersson, M. R. (2009). Alternating copolymers of fluorene and donor-acceptor-donor segments designed for miscibility in bulk heterojunction photovoltaics. JOURNAL OF MATERIALS CHEMISTRY, 19(30), 5359-5363
Open this publication in new window or tab >>Alternating copolymers of fluorene and donor-acceptor-donor segments designed for miscibility in bulk heterojunction photovoltaics
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2009 (English)In: JOURNAL OF MATERIALS CHEMISTRY, ISSN 0959-9428, Vol. 19, no 30, p. 5359-5363Article in journal (Refereed) Published
Abstract [en]

A novel copolymer based on alternating fluorene and donor-acceptor-donor segments is reported, together with its photovoltaic properties in blends with fullerene derivatives. The balanced electron and hole mobility of the blends leads to a power-conversion efficiency of 2-3% under solar illumination.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-20134 (URN)10.1039/b823137k (DOI)
Available from: 2009-08-31 Created: 2009-08-31 Last updated: 2009-08-31
Ederth, T., Pettitt, M. E., Nygren, P., Du, C.-X., Ekblad, T., Zhou, Y., . . . Liedberg, B. (2009). Interactions of Zoospores of Ulva linza with Arginine-Rich Oligopeptide Monolayers. Langmuir, 25(16), 9375-9383
Open this publication in new window or tab >>Interactions of Zoospores of Ulva linza with Arginine-Rich Oligopeptide Monolayers
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2009 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 25, no 16, p. 9375-9383Article in journal (Refereed) Published
Abstract [en]

We recently reported oil the strong interactions of zoospores of the green alga, Ulva linza with all arginine-rich oligopeptide self-assembled monolayer (SAM) [Biofouling 2008, 24, 303-312], where the arginine-rich peptide induced not only high spore settlement, but also a form of abnormal settlement, or "pseudo-settlement", whereby it proportion of spores do not go through the normal process of surface exploration, adhesive exocytosis, and loss of flagella. Further. it was demonstrated that both the total number of settled spores and the fraction of pseudosettled spores were related to the surface density of the arginine-rich peptide. Here we present a further investigation of the interactions of zoospores of ulva with a set of oligomeric, de nom designed, arginine-rich peptides, specifically aimed to test the effect of peptide primary structure on the interaction. Via variations in the peptide length and by permutations in the amino acid sequences, we gain further insight into the spore-surface interactions. The interpretation of the biological assays is supported by physicochemical characterization of the SAMs using infrared spectroscopy, ellipsometry, and contact angle measurement. Results confirm the importance of arginine residues for the anomalous pseudosettlement, and we found that settlement is modulated by variations in both the total length and peptide primary structure. To elucidate the Causes of the anomalous settlement and the possible relation to peptide-membrane interactions, we also compared the settlement of the "naked" zoospores of Ulva(which present it lipoprotein membrane to the exterior without a discrete polysaccharide cell wall), with the settlement of diatoms (unicellular algae that are surrounded by it silica cell wall), onto the peptide SAMs. Cationic SAMs do not notably affect settlement (attachment), adhesion strength, or viability of diatom cells, Suggesting that the effect of the peptides on zoospores of Ulva is mediated via specific peptide-membrane interactions.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2009
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-19996 (URN)10.1021/la900688g (DOI)
Note

The previous status of this article was Manuscript.

Available from: 2009-08-24 Created: 2009-08-24 Last updated: 2017-12-13Bibliographically approved
Li, F., Zhou, Y., Zhang, F., Liu, X., Zhan, Y. & Fahlman, M. (2009). Tuning Work Function of Noble Metals As Promising Cathodes in Organic Electronic Devices. CHEMISTRY OF MATERIALS, 21(13), 2798-2802
Open this publication in new window or tab >>Tuning Work Function of Noble Metals As Promising Cathodes in Organic Electronic Devices
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2009 (English)In: CHEMISTRY OF MATERIALS, ISSN 0897-4756, Vol. 21, no 13, p. 2798-2802Article in journal (Refereed) Published
Abstract [en]

Work function (WF) modification of metal electrodes by adsorbing electron-rich or electron-deficient molecules oil metal surfaces has become a field of significant interest. The barrier for charge carrier injection in organic semiconductor devices can be reduced by molecular adsorption, leading to all interfacial dipole. Here, we demonstrate that the WF of noble metals such as ALL call be decreased significantly by adsorbing air stable n-type dopant acridine orange base (AOB) thin film. When a (sub)monolayer AOB is deposited on sputter-cleaned Au, the WF of the substrate changes from 5.2 to 3.5 eV. At complete coverage of the Au Surface, the WF is further reduced to 3.3 eV. When a (sub) monolayer of AOB is inserted between Au and C-60 thin film, the barrier of electron injection is decreased by 0.4 +/- 0.1 eV as compared to an Au-C-60 interface without AOB. Polymer solar cells with AOB/Au as a cathode have a similar open circuit voltage and comparable power conversion efficiency with devices using LiF/Al as a cathode, demonstrating that the AOB-modified gold electrode is an efficient low-work-function contact. Given the low positive pinning energy of 3.3 eV for AOB, we expect that other conventional high-work-function materials (Ag, ITO. La0.7Sr0.3MnO3 and even PEDOT:PSS) can be modified by AOB as effectively as Au.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-20146 (URN)10.1021/cm900508t (DOI)
Available from: 2009-09-01 Created: 2009-08-31 Last updated: 2015-05-18
Zhou, Y., Liedberg, B., Gorochovceva, N., Makuska, R., Dedinaite, A. & Claesson, P. M. (2007). Chitosan-N-poly(ethylene oxide) brush polymers for reduced nonspecific protein adsorption. Journal of Colloid and Interface Science, 305(1), 62-71
Open this publication in new window or tab >>Chitosan-N-poly(ethylene oxide) brush polymers for reduced nonspecific protein adsorption
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2007 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 305, no 1, p. 62-71Article in journal (Refereed) Published
Abstract [en]

The possibility of using a novel comb polymer consisting of a chitosan backbone with grafted 44 units long poly(ethylene oxide) side chains for reducing nonspecific protein adsorption to gold surfaces functionalized by COOH-terminated thiols has been explored. The comb polymer was attached to the surface in three different ways: by solution adsorption, covalent coupling, and microcontact printing. The protein repellant properties were tested by monitoring the adsorption of bovine serum albumin and fibrinogen employing surface plasmon resonance and imaging null ellipsometry. It was found that a significant reduction in protein adsorption is achieved as the comb polymer layer is sufficiently dense. For solution adsorption this was achieved by adsorption from high pH solutions. On the other hand, the best performance of the microcontact printed surfaces was obtained when the stamp was inked either at low or at high pH. For a given comb polymer layer thickness/poly(ethylene oxide) density, significant differences in protein repellant properties were observed between the different preparation methods, and it is suggested that a reduction in the mobility of the comb polymer layer generated by covalent attachment favors a reduced protein adsorption. © 2006 Elsevier Inc. All rights reserved.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-36232 (URN)10.1016/j.jcis.2006.09.058 (DOI)30625 (Local ID)30625 (Archive number)30625 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-13
Zhou, Y., Andersson, O., Lindberg, P. & Liedberg, B. (2004). Protein Microarrays on Carboxymethylated Dextran Hydrogels: Immobilization, Characterization and Application. Microchimica Acta, 147(1-2), 21-30
Open this publication in new window or tab >>Protein Microarrays on Carboxymethylated Dextran Hydrogels: Immobilization, Characterization and Application
2004 (English)In: Microchimica Acta, ISSN 0026-3672, E-ISSN 1436-5073, Vol. 147, no 1-2, p. 21-30Article in journal (Refereed) Published
Abstract [en]

Tetraoctadecylammonium bromide (TOAB, (CH3(CH2)17)4N+Br) has been used to print temporary hydrophobic barriers on carboxymethylated dextran (CMD) hydrogels to create a generic platform for protein microarray applications. The primary reason for printing temporary hydrophobic barriers is to prevent cross-contamination and overflow during microdrop dispensing. Equally important is to eliminate the risk for non-specific binding to the barriers during analyte exposure. This has been accomplished by introducing a regeneration step that removes the barriers after ligand immobilization. The overall fabrication process was characterized by microscopic wetting, atomic force microscopy, imaging ellipsometry, fluorescence microscopy, surface plasmon microscopy and biospecific interaction analysis. A series of model proteins including transferrin, Protein A, anti-myoglobin and bovine serum albumin was spotted into the TOAB-defined areas under different experimental conditions, e.g. at increased humidity and reduced substrate temperature or with glycerol as an additive in the protein solution. Much emphasis was devoted to studies aiming at exploring the homogeneity and activity of the immobilized proteins. The printed barriers were removed after protein immobilization using tert-n-butyl alcohol (TBA). TBA was found to be a very efficient agent as compared to previously used salt regeneration solutions, and the regeneration time could be reduced from 30 to 10 minutes. Finally, the potential of using the well established CMD hydrogel chemistry as a platform for protein microarrays was exploited using surface plasmon microscopy.

Keywords
Reversible hydrophobic barrier, microcontact printing, piezodispensing, protein microarrays, surface plasmon microscopy
National Category
Other Basic Medicine
Identifiers
urn:nbn:se:liu:diva-14919 (URN)10.1007/s00604-004-0223-5 (DOI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2018-01-13
Zhou, Y., Andersson, O., Lindberg, P. & Liedberg, B. (2004). Reversible hydrophobic barriers introduced by microcontact printing: Application to protein microarrays. Mikrochimica Acta, 146(3-4), 193-205
Open this publication in new window or tab >>Reversible hydrophobic barriers introduced by microcontact printing: Application to protein microarrays
2004 (English)In: Mikrochimica Acta, ISSN 0026-3672, E-ISSN 1436-5073, Vol. 146, no 3-4, p. 193-205Article in journal (Refereed) Published
Abstract [en]

Microcontact printing (µCP) has been used to introduce temporary hydrophobic barriers on carboxymethylated dextran (CMD) hydrogels on gold. Among the investigated types of inks, tetraoctadecylammonium bromide (TOAB), electrostatically bound to the CMD layer, provided the most well-defined features both with respect to pattern-definition and reversibility upon exposure to a regeneration solution. The printed patterns were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM), microscopic wetting and imaging null ellipsometry to explore the influence of concentration of ink solution and contact time on the appearance of the printed layer. AFM revealed that the printed TOAB molecules aggregated into clusters rather than into a homogeneous mono- or multilayer on the CMD hydrogel. It was also observed that printed areas of TOAB that are larger than 25?µm are inhomogeneous most likely because of an edge transfer lithography (ETL) mechanism. A protein model system based on Protein A-rabbit antimouse Fc ? was used to evaluate the potential of the patterned surface as a protein microarray chip by means of surface plasmon microscopy (SPM). Moreover, non-specific adsorption of several proteins onto TOAB barriers was also studied using surface plasmon resonance (SPR), and it is evident that undesired adsorption can be eliminated by removing barriers after ligand immobilization, but prior to analyte exposure, by treating the patterned surface with a simple salt regeneration solution. © Springer-Verlag/Wien 2004.

Keywords
Carboxymethylated dextran, Microcontact printing, Protein microarrays, Reversible hydrophobic barrier, Surface plasmon microscopy
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-45734 (URN)10.1007/s00604-003-0174-2 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Zhou, Y., Valiokas, R. & Liedberg, B. (2004). Structural characterization of microcontact printed arrays of hexa(ethylene glycol)-Terminated alkanethiols on gold. Langmuir, 20(15), 6206-6215
Open this publication in new window or tab >>Structural characterization of microcontact printed arrays of hexa(ethylene glycol)-Terminated alkanethiols on gold
2004 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 20, no 15, p. 6206-6215Article in journal (Refereed) Published
Abstract [en]

This paper reports on the structural characteristics of microcontact printed oligo(ethylene glycol)-terminated alkanethiol layers, HS(CH 2)15CONH-(CH2CH2O)6-H (hereafter EG6), on gold. Microwetting, contact angle goniometry, imaging null ellipsometry, and infrared reflection-absorption spectroscopy (IRAS) are used to characterize the printed EG6 layers, and the quality of these layers in terms of layer thickness and the crystallinity of the alkyl and ethylene glycol portions is compared with data obtained from analogous layers prepared by solution self-assembly. The outcome of the printing process is critically dependent on the experimental parameters used to prepare the patterns. It is found that high quality layers, consisting of densely packed all-trans alkyl chains terminated with relatively helical hexa( ethylene glycol) tails, are formed by inking the poly(dimethylsiloxane) (PDMS) stamp with a 1 mM EG6 solution and contacting it with gold for 15 min. The homogeneity of printed layers is not as good as the homogeneity of those prepared from solution under similar conditions, most likely because of simultaneous transfer of low molecular weight residues from the PDMS stamp. These residues, however, can be easily removed upon ultrasonication in ethanol without affecting the quality of the printed layer. Further on, the microscopic square-shaped bare gold patterns formed after microcontact printing (µCP) are subsequently filled with 16-hexadecanoic acid (hereafter THA) or HS(CH 2)15CONH-(CH2CH2O)6-COOH (hereafter EG6COOH) to provide a microarray platform for further covalent attachment of biomolecules. Well-defined structures in terms of wettability contrast, sharpness, and height differences between the printed and back-filled areas are confirmed by imaging null ellipsometry and microscopic wetting.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-45686 (URN)10.1021/la049421a (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
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