liu.seSearch for publications in DiVA
Change search
Link to record
Permanent link

Direct link
BETA
Zhang, Xuanjun
Alternative names
Publications (10 of 58) Show all publications
Zhang, X., Wang, W., Hu, Z., Wang, G. & Uvdal, K. (2015). Coordination polymers for energy transfer: Preparations, properties, sensing applications, and perspectives. Coordination chemistry reviews, 284, 206-235
Open this publication in new window or tab >>Coordination polymers for energy transfer: Preparations, properties, sensing applications, and perspectives
Show others...
2015 (English)In: Coordination chemistry reviews, ISSN 0010-8545, E-ISSN 1873-3840, Vol. 284, p. 206-235Article, review/survey (Refereed) Published
Abstract [en]

This review highlights the recent progress of bulk and nanoscale coordination polymer (CP) materials forenergy transfer. Artificial light-harvesting materials with efficient energy transfer are practically usefulfor a variety of applications including photovoltaic, white emitting devices, and sensors. In the pastdecades CP (aka Metal-organic framework, MOF) has experienced rapid development due to a multitude of applications, including catalyst, gas storage and separations, non-linear optics, luminescence, and soon. Recent research has shown that CP is a very promising light-harvesting platform because the energytransfers can occur between different ligands, from ligand to metal centers, or from MOF skeleton to guestspecies. This review comprehensively surveyed synthetic approaches to light-harvesting CPs, and postfunctionalization. Sensing applications and achievements in energy-transfer CP nanoparticles and thinfilms were also discussed.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Coordination polymers, Energy transfer, luminescence, sensing, nanoparticles, thin film
National Category
Chemical Sciences Inorganic Chemistry Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-114189 (URN)10.1016/j.ccr.2014.10.006 (DOI)000348016700007 ()
Funder
Linköpings universitet, SFO-Mat-Liu #2009-00971
Available from: 2015-02-12 Created: 2015-02-12 Last updated: 2017-12-04
Hu, Z.-J., Hu, J., Cui, Y., Wang, G., Zhang, X., Uvdal, K. & Gao, H.-W. (2014). A facile "click" reaction to fabricate a FRET-based ratiometric fluorescent Cu2+ probe. Journal of materials chemistry. B, 2(28), 4467-4472
Open this publication in new window or tab >>A facile "click" reaction to fabricate a FRET-based ratiometric fluorescent Cu2+ probe
Show others...
2014 (English)In: Journal of materials chemistry. B, ISSN 2050-750X, E-ISSN 2050-7518, Vol. 2, no 28, p. 4467-4472Article in journal (Refereed) Published
Abstract [en]

A facile one-step Cu(I)-catalyzed "click" reaction, between a dansyl-azide and a propargyl-substituted rhodamine B hydrazide, is employed to fabricate a novel FRET ratiometric "off-on" fluorescent probe. The sensitive emission of the donor, a dansyl group, overlaps perfectly with the absorption of the acceptor, xanthene in the open-ring rhodamine. The proposed probe shows high selectivity towards Cu2+. The ratio of emission intensities at 568 and 540 nm (I-568/I-540) exhibits a drastic 28-fold enhancement upon addition of Cu2+. The probe shows an excellent linear relationship between emission ratios and the concentrations of Cu2+ from 10 to 50 mu M, with a detection limit (S/N = 3) of 0.12 mu M. The preliminary cellular studies demonstrated that the probe is cell membrane permeable and could be applied for ratiometric fluorescence imaging of intracellular Cu2+ with almost no cytotoxicity. The ingenuity of the probe design is to construct a FRET donor-acceptor interconnector and a selective receptor simultaneously by "click" reaction. The strategy was verified to have great potential for developing novel FRET probes for Cu2+.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-109291 (URN)10.1039/c4tb00441h (DOI)000338646000009 ()
Available from: 2014-08-11 Created: 2014-08-11 Last updated: 2017-12-05Bibliographically approved
Hu, J., Hu, Z.-J., Cui, Y., Zhang, X., Gao, H.-W. & Uvdal, K. (2014). A rhodamine-based fluorescent probe for Hg2+ and its application for biological visualization. Sensors and actuators. B, Chemical, 203, 452-458
Open this publication in new window or tab >>A rhodamine-based fluorescent probe for Hg2+ and its application for biological visualization
Show others...
2014 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 203, p. 452-458Article in journal (Refereed) Published
Abstract [en]

A new visible light excitable fluorescent probe (1) is synthesized by appending a hydroxymethyl-pyridine to rhodamine B hydrazide. The probe displays very specific Hg2+-induced colour change and fluorescent enhancement in the aqueous systems. The "turn-on" response of fluorescence is based on a binding-induced ring-opening process from the spirolactam (nonfluorescent) to acyclic xanthene (fluorescent) in rhodamine B. The coordinating atoms O-center dot-N-N-O-center dot from the hydroxymethyl-pyridine and rhodamine B hydrazide play dominant role in the formation of a complex with 1:1 stoichiometry of Hg2+ to 1. It exhibits a linear response in the range of 0.1-5 mu M with the limit of detection (LOD) of 15.7 nM (3 sigma/slope), while the calculated value of the association constant of Hg2+/1 is 0.70 x 10(5) M-1. Furthermore, confocal microscopy imaging experiment demonstrates the probe 1 can be applied as a fluorescent probe for visualization of Hg2+ in living HeLa cells.

Place, publisher, year, edition, pages
Elsevier, 2014
Keywords
Mercury; Rhodamine; Fluorescence; Probe; Fluorescent imaging
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-111253 (URN)10.1016/j.snb.2014.06.104 (DOI)000341455400059 ()
Note

Funding Agencies|National Key Technology RandD Program of China [2013BAC01B01]; National Natural Science Foundation of China [21007046]; Swedish Government Strategic Faculty Grant in Material Science (SFO, MATLIU) in Advanced Functional Materials [SFO-Mat-LiU#2009-00971]

Available from: 2014-10-15 Created: 2014-10-14 Last updated: 2017-12-05
Ding, A., Yang, L., Zhang, Y., Zhang, G., Kong, L., Zhang, X., . . . Yang, J. (2014). Complex-Formation-Enhanced Fluorescence Quenching Effect for Efficient Detection of Picric Acid. Chemistry - A European Journal, 20(38), 12215-12222
Open this publication in new window or tab >>Complex-Formation-Enhanced Fluorescence Quenching Effect for Efficient Detection of Picric Acid
Show others...
2014 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 20, no 38, p. 12215-12222Article in journal (Refereed) Published
Abstract [en]

Amine-functionalized alpha-cyanostilbene derivatives (Z)-2-(4-aminophenyl)-3-(4-butoxyphenyl) acrylonitrile (ABA) and (Z)-3-(4-butoxyphenyl)-2-[4-(butylamino) phenyl] acrylonitrile (BBA) were designed for specific recognition of picric acid (PA), an environmental and biological pollutant. The 1:1 host-guest complexes formed between the chemosensors and PA enhanced fluorescence quenching, thus leading to sensitive and selective detection in aqueous media and the solid phase.

Place, publisher, year, edition, pages
Wiley-VCH Verlag, 2014
Keywords
amines; fluorescence; host-guest systems; ion pairs; sensors
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-111450 (URN)10.1002/chem.201402790 (DOI)000341831600031 ()25081497 (PubMedID)
Note

Funding Agencies|National Natural Science Foundation of China [21101001, 50873001, 61107014]; Natural Science Foundation of Anhui Province [1208085MB21]; 211 Project of Anhui University; Team for Scientific Innovation Foundation of Anhui Province [2006KJ007TD]; Swedish government (SFO-Mat-Liu) [2009-00971]

Available from: 2014-10-21 Created: 2014-10-17 Last updated: 2017-12-05
Wang, G., Zhang, X., Skallberg, A., Liu, Y., Hu, Z.-J., Mei, X. & Uvdal, K. (2014). One-step synthesis of water-dispersible ultra-small Fe3O4 nanoparticles as contrast agents for T-1 and T-2 magnetic resonance imaging. Nanoscale, 6(5), 2953-2963
Open this publication in new window or tab >>One-step synthesis of water-dispersible ultra-small Fe3O4 nanoparticles as contrast agents for T-1 and T-2 magnetic resonance imaging
Show others...
2014 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 6, no 5, p. 2953-2963Article in journal (Refereed) Published
Abstract [en]

Uniform, highly water-dispersible and ultra-small Fe3O4 nanoparticles were synthesized via a modified one-step coprecipitation approach. The prepared Fe3O4 nanoparticles not only show good magnetic properties, long-term stability in a biological environment, but also exhibit good biocompatibility in cell viability and hemolysis assay. Due to the ultra-small sized and highly water-dispersibility, they exhibit excellent relaxivity properties, the 1.7 nm sized Fe3O4 nanoparticles reveal a low r(2)/r(1) ratio of 2.03 (r(1) = 8.20 mM(-1) s(-1), r(2) = 16.67 mM(-1) s(-1)); and the 2.2 nm sized Fe3O4 nanoparticles also appear to have a low r2/r1 ratio of 4.65 (r(1) = 6.15 mM(-1) s(-1), r(2) = 28.62 mM(-1) s(-1)). This demonstrates that the proposed ultra-small Fe3O4 nanoparticles have great potential as a new type of T-1 magnetic resonance imaging contrast agents. Especially, the 2.2 nm sized Fe3O4 nanoparticles, have a competitive r(1) value and r(2) value compared to commercial contrasting agents such as Gd-DTPA (r(1) = 4.8 mM(-1) s(-1)), and SHU-555C (r(2) = 69 mM(-1) s(-1)). In vitro and in vivo imaging experiments, show that the 2.2 nm sized Fe3O4 nanoparticles exhibit great contrast enhancement, long-term circulation, and low toxicity, which enable these ultrasmall sized Fe3O4 nanoparticles to be promising as T-1 and T-2 dual contrast agents in clinical settings.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014
National Category
Engineering and Technology Physical Sciences
Identifiers
urn:nbn:se:liu:diva-105589 (URN)10.1039/c3nr05550g (DOI)000332127200059 ()
Available from: 2014-03-28 Created: 2014-03-27 Last updated: 2017-12-05
Zhang, G., Ding, A., Zhang, Y., Yang, L., Kong, L., Zhang, X., . . . Yang, J. (2014). Schiff base modified α-cyanostilbene derivative with aggregation-induced emission enhancement characteristics for Hg2+ detection. Sensors and actuators. B, Chemical, 202, 209-216
Open this publication in new window or tab >>Schiff base modified α-cyanostilbene derivative with aggregation-induced emission enhancement characteristics for Hg2+ detection
Show others...
2014 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 202, p. 209-216Article in journal (Refereed) Published
Abstract [en]

A Schiff base functionalized α-cyanostilbene derivative (TS) has been synthesized via a simple and straightforward method and characterized by FT-IR, 1H NMR, 13C NMR and mass spectra. TS possessed excellent AIEE properties and exhibited turn-on fluorescent responses to Hg2+. The results of UV-vis and fluorescence titration experiments revealed that TS was selective and sensitive to Hg2+ in pure THF and aqueous environment. The coordination of TS and Hg2+ ions generated TS-Hg complex locked the dancing molecule because of the flexible chain in the middle of the molecule and the complex was lower soluble induced formation of large aggregates that further limited the non-radiative relaxation channel enhanced emission after adding Hg2+ ions in aqueous solution, which had been confirmed by 1H NMR and dynamic light scattering (DLS). © 2014 Published by Elsevier Inc.

Place, publisher, year, edition, pages
Elsevier, 2014
Keywords
Aggregation-induced emission enhancement (AIEE); Chemosensor; Fluorescence; Mercury; Schiff base
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-109965 (URN)10.1016/j.snb.2014.05.057 (DOI)000339994900028 ()2-s2.0-84902160501 (Scopus ID)
Note

Funding Agencies|201310357136, National Natural Science Foundation of China; 21101001, NSFC, National Natural Science Foundation of China; 50873001, NSFC, National Natural Science Foundation of China; 61107014, NSFC, National Natural Science Foundation of China

Available from: 2014-09-12 Created: 2014-08-29 Last updated: 2017-12-05Bibliographically approved
Ye, F., Wu, C., Sun, W., Yu, J., Zhang, X., Rong, Y., . . . Chiu, D. (2014). Semiconducting polymer dots with monofunctional groups. Chemical Communications, 50(42), 5604-5607
Open this publication in new window or tab >>Semiconducting polymer dots with monofunctional groups
Show others...
2014 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 50, no 42, p. 5604-5607Article in journal (Refereed) Published
Abstract [en]

This communication describes an approach for preparing monovalent semiconducting polymer dots (mPdots) with a size of 5 nm where each mPdot was composed of precisely a single active functional group. © the Partner Organisations 2014.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-116384 (URN)10.1039/c4cc01689k (DOI)24728589 (PubMedID)2-s2.0-84899626066 (Scopus ID)
Available from: 2015-03-27 Created: 2015-03-26 Last updated: 2017-12-04
Sun, K., Chen, H., Wang, L., Yin, S., Wang, H., Xu, G., . . . Qin, W. (2014). Size-Dependent Property and Cell Labeling of Semiconducting Polymer Dots. ACS Applied Materials and Interfaces, 6(13), 10802-10812
Open this publication in new window or tab >>Size-Dependent Property and Cell Labeling of Semiconducting Polymer Dots
Show others...
2014 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 6, no 13, p. 10802-10812Article in journal (Refereed) Published
Abstract [en]

Semiconducting polymer dots (Pdots) represent a new class of fluorescent nanoparticles for biological applications. In this study, we investigated their size-dependent fluorescence and cellular labeling properties. We demonstrate that the polymer conformation in solution phase largely affects the polymer folding and packing during the nanoparticle preparation process, resulting in solution-phase control over the fluorescence properties of semiconducting polymer nanoparticles. The resulting Pdots exhibit apparent size dependent absorption and emission, a characteristic feature of different chain packing behaviors due to the preparation conditions. Single-particle fluorescence imaging was employed to perform a side-by-side comparison on the Pdot brightness, indicating a quadratic dependence of single-particle brightness on particle size. Upon introducing a positively charged dye Nile blue, all the three type of Pdots were quenched very efficiently (K-sv greater than 1 x 10(7) M-1) in an applied quenching process at low dye concentrations, but exhibit apparent difference in quenching efficiency with increasing dye concentration. Furthermore, Pdots of different sizes were used for cell uptake and cellular labeling involving biotin-streptavidin interactions. Fluorescence imaging together with flow cytometry studies clearly showed size dependent labeling brightness. Small-sized Pdots appear to be more effective for immunolabeling of cell surface, whereas medium-sized Pdots exhibit the highest uptake efficiency. This study provides a concrete guidance for selecting appropriate particle size for biological imaging and sensing applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014
Keywords
conjugated polymer; nanoparticle; fluorescence; spectroscopy; single-particle imaging; quenching
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-109374 (URN)10.1021/am502733n (DOI)000338979900105 ()24930393 (PubMedID)
Available from: 2014-08-15 Created: 2014-08-15 Last updated: 2017-12-05Bibliographically approved
Rong, Y., Yu, J., Zhang, X., Sun, W., Ye, F., Wu, I.-C., . . . Chiu, D. T. (2014). Yellow Fluorescent Semiconducting Polymer Dots with High Brightness, Small Size, and Narrow Emission for Biological Applications. ACS Macro Letters, 3(10), 1051-1054
Open this publication in new window or tab >>Yellow Fluorescent Semiconducting Polymer Dots with High Brightness, Small Size, and Narrow Emission for Biological Applications
Show others...
2014 (English)In: ACS Macro Letters, ISSN 2161-1653, Vol. 3, no 10, p. 1051-1054Article in journal (Refereed) Published
Abstract [en]

Cross-linked polymer dots with intense and narrow yellow emission were designed using boron-dipyrromethene (BODIPY) polymer as the acceptor and poly[9,9-dioctylfluorenyl-2,7-diyl-co-1,4-benzo-{2,1-3}-thiadiazole] (PFBT) polymer as the donor. The emission fwhms of the polymer dots (Pdots) were 37 nm. CL-BODIPY 565 Pdots were about S times brighter than commercial quantum dots (Qdots) 565 under identical experimental conditions. Specific cellular targeting indicated that the small, bright, and narrow emissive CL-BODIPY 565 Pdots are promising probes for biological applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-112310 (URN)10.1021/mz500383c (DOI)000343673200019 ()25419486 (PubMedID)
Note

Funding Agencies|National Institutes of Health [NS052637, GM085485]; Life Sciences Discovery Fund; Department of Defense CDMRP program [BC100510]; University of Washington

Available from: 2014-11-24 Created: 2014-11-24 Last updated: 2014-11-28Bibliographically approved
Zhang, X., Yu, J., Rong, Y., Ye, F., Chiu, D. T. & Uvdal, K. (2013). High-intensity near-IR fluorescence in semiconducting polymer dots achieved by cascade FRET strategy. Chemical Science, 4(5), 2143-2151
Open this publication in new window or tab >>High-intensity near-IR fluorescence in semiconducting polymer dots achieved by cascade FRET strategy
Show others...
2013 (English)In: Chemical Science, ISSN 2041-6520, E-ISSN 2041-6539, Vol. 4, no 5, p. 2143-2151Article in journal (Refereed) Published
Abstract [en]

Near-IR (NIR) emitting semiconducting polymer dots (Pdots) with ultrabright fluorescence have been prepared for specific cellular targeting. A series of π-conjugated polymers were synthesized to form water dispersible multicomponent Pdots by an ultrasonication-assisted co-precipitation method. By optimizing cascade energy transfer in Pdots, high-intensity NIR fluorescence (Φ = 0.32) with tunable excitations, large absorption–emission separation (up to 330 nm), and narrow emission bands (FWHM = 44 nm) have been achieved. Single-particle fluorescence imaging show that the as-prepared NIR Pdots were more than three times brighter than the commercially available Qdot705 with comparable sizes under identical conditions of excitation and detection. Because of the covalent introduction of carboxylic acid groups into polymer side chains, the bioconjugation between NIR-emitting Pdots and streptavidins can be readily completed via these functional groups on the surface of Pdots. Furthermore, through flow cytometry and confocal fluorescence microscopy the NIR-emitting Pdot–streptavidin conjugates proved that they could effectively label EpCAM receptors on the surface of MCF-7 cells, via specific binding between streptavidin and biotin.

Place, publisher, year, edition, pages
RSC Publishing, 2013
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-90660 (URN)10.1039/c3sc50222h (DOI)000316966500028 ()
Available from: 2013-04-03 Created: 2013-04-03 Last updated: 2017-12-06Bibliographically approved
Organisations

Search in DiVA

Show all publications