个人简介

B.Sc, Zhejiang Univ.; M.Sc., Peking Univ. & Univ. of Chicago; Ph.D., UC Berkeley; Postdoctoral, Stanford & UC Santa Barbara

研究领域

Research Areas: Materials Physics and Chemistry/Nanomaterials and Nanophotonics/Optical Materials/Optical Spectroscopy and Imaging

The research in our group mainly focuses on novel nanocomposite materials and their linear and nonlinear optical properties as well as their applications in imaging, sensing, biomedicine, energy and environmental areas. Our research spans a broad range from materials preparation, fundamental understanding and practical applications. i). Nanocomposites with enhanced optical properties Various nanocomposites containing noble metals and organic materials are prepared to investigate their optical properties, such as enhanced fluorescence, two-photon excitation and Raman scattering using various novel optical spectroscopy and imaging techniques. Their applications in bio-imaging, sensing, biomedicine, optoelectronics and photo-catalysis (water splitting and organic waste treatment) are also being explored. ii). Conjugated polymers and their applications Conjugated organic materials, such as conjugated polymers and oligomers, have many interesting optical and electronic properties and thus many promising applications. Understanding their optical properties is not only fundamentally important, but also vital for the application of these materials. Due to their exceptional properties, conjugated materials can function as light-harvesting complex to significantly enhance the optical properties of nearby molecules by energy transfer. We will develop various conjugated polymer based platforms for applications in bio-sensing, bio-imaging, biomedicine and optoelectronic devices. iii). Optical spectroscopy and imaging Our group is consistently developing various novel spectroscopy and imaging techniques, in particular those related with femtosecond lasers. We are developing various techniques such as transient absorption (pump probe), time-resolved fluorescence, z-scan, multi-photon excitation fluorescence microscopy, fluorescence lifetime imaging microscopy (FLIM), single particle spectroscopy, and time-gated detections. These novel techniques will be used to understand the photo-physics of various nanocomposite and organic materials in solution and in films, and in device structures.

近期论文

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C.F. Jiang, T.T. Zhao, S. Li, N.Y. Gao, Q.-H. Xu*, "Highly Sensitive Two-photon Sensing of Thrombin in Serum using Aptamers and Silver Nanoparticles", ACS Appl. Mater. Interf., 2013, in press (DOI: 10.1021/am403046p). C.H. Fang, Y.H. Lee, L. Shao, R.B. Jiang, J.F. Wang*, and Q.-H. Xu*, "Correlating the Plasmonic and Structural Evolutions during the Sulfidation of Ag Nanocubes", ACS Nano, 2013, 7 (10), 9354-9365 T.T. Zhao, X.-F. Jiang, N.Y. Gao, S. Li, N. Zhou, R.Z. Ma, Q.-H. Xu*, "Solvent Dependent Two-Photon Photoluminescence and Excitation Dynamics of Gold Nanorods", J. Phys. Chem. B, 2013, in press (DOI: 10.1021/jp405929w). X.-F. Jiang, Y.L. Pan, C.F. Jiang, T.T. Zhao, P.Y. Yuan, T. Venkatesan, and Q.-H. Xu*, "Excitation Nature of Two-photon Photoluminescence of Gold Nanorods and Coupled Gold Nanoparticles by Two-pulse Emission Modulation Spectroscopy", J. Phys. Chem. Lett. 2013, 4, 1634-1638. X. Xie, N.Y. Gao, R. Deng, Q. Sun, Q.-H. Xu, X. Liu*, "Mechanistic Investigation of Photon Upconversion in Nd3+-Sensitized Core-shell Nanoparticles", 2013, J. Am. Chem. Soc. 2013, 135 (34), 12608-12611. C.F. Jiang, T.T. Zhao, P.Y. Yuan; N.Y. Gao, Y.L. Pan, Z.P. Guan, N. Zhou, Q.-H. Xu*, "Two-photon Induced Photoluminescence and Singlet Oxygen Generation from Aggregated Gold Nanoparticles", ACS Appl. Mater. Interf. 2013, 5 (11), 4972-4977. P.Y. Gu, C Lu, Z.J. Hu, N Li, T.T. Zhao, Q.-F. Xu,* Q.-H. Xu, J Zhang, JM Lu*, "AIEE effect and Two-Photon Absorption (TPA) enhancement induced by polymerization: synthesis of a monomer with ICT and AIE effects and its homopolymer by ATRP and a study of their photophysical properties", J. Mater. Chem. C, 2013, 1(14), 2599-2606. N. Zhou, L. Polavarapu, N.Y. Gao, Y.L. Pan, P.Y. Yuan, Q. Wang, Q.-H. Xu*, "TiO2 coated Au/Ag nanorods with enhanced photocatalytic activity under visible light irradiation", Nanoscale, 2013, 5, 4236-4241. K. Yu, P. Zijlstra*, J. Sader, Q.-H. Xu*, M. Orrit, "Damping of Acoustic Vibrations of Immobilized Single Gold Nanorods in Different Environments", Nano Lett., 2013, 13 (6), 2710-2716. M.D. Regulacio, C.Ye, S. H. Lim, Y. G. Zheng, Q.-H. Xu, and M.-Y. Han*, "Facile noninjection synthesis and photocatalytic properties of wurtzite-phase CuGaS2 nanocrystals with elongated morphologies", CrystEngComm, 2013, 15, 5214-5217 Z.P. Guan, N.Y. Gao, F. Han, Q.-H. Xu*, "Huge Enhancement in Two-photon Photoluminescence of Au Nanoparticle Clusters Revealed by Single Particle Spectroscopy", J. Am. Chem. Soc. 2013, 135 (19), 7272-7277. J. H. Wu,* Z.P. Guan, S. K. Yang, P.Y. Yuan, Q.-H. Xu,*, and G. Q. Xu* "Capping-Agent-Free Synthesis of Substrate Supported Porous Icosahedral Gold Nanoparticles", Nanoscale, 2013, 5(7), 2983-2989. Li, L.; Shen, X.; Xu, Q.-H.; Yao, S. Q.* "A Switchable Two-photon Membrane Tracer Capable of Imaging Membrane-Associated Protein Tyrosine Phosphatase Activities", Angew. Chem. Int. Ed., 2013, 52, 424-428. X.Q. Shen, L. Li, A. C. M. Chan, S. Q. Yao, Q.-H. Xu, "Water soluble conjugated polymers for two-photon cell imaging and two-photon photodynamic therapy", Adv. Opt. Mater., 2013, 1 (1), 92-99. Q.-H. Xu, "SERS under Magnetic Control", Ann. Phys., 2012, 524 (11), A161-A162. T.T. Zhao, X.Q. Shen, L. Li, Z.P. Guan, N.Y. Gao, P.Y. Yuan, S.Q. Yao, Q.-H. Xu and G.Q Xu "Gold nanorods as dual photosensitizing and imaging agents for two-photon photodynamic therapy", Nanoscale, 2012, 4, 7712-7719. Z.P. Guan, S. Li, P.B. Cheng, N. Zhou, N.Y. Gao, Q.-H. Xu, "Band-selective Coupling-induced Enhancement of Two-photon Photoluminescence in Gold Nanocubes and Its Application as Turn-on Fluorescent Probes for Cysteine and Glutathione", ACS Appl. Mater. & Interf, 2012, 4 (10),5711-5716. F. Han, Z.P. Guan, T.S. Tan, Q.-H. Xu,* "Size Dependent Two-photon Excitation Photoluminescence Enhancement in Coupled Noble Metal Nanoparticles", ACS Appl. Mater. & Interf, 2012, 4(9), 4746-51. S. Wang, C.T. Nai, X.-F. Jiang,Y.H. Pan, C.-H. Tan, M. Nesladek, Q.-H. Xu, and K.P. Loh*, "Graphene Oxide-Polythiophene Hybrid with Broad-Band Absorption and Photocatalytic Properties", J. Phys. Chem. Lett., 2012, 3, 2332-2336. Y.L. Pan, S.Z. Deng, L. Polavarapu, N.Y. Gao, P.Y. Yuan, C.H. Sow, Q.-H. Xu*, "Plasmon Enhanced Photo-catalytic Properties of Cu2O Nanowires-Au Nanoparticles Assembly", Langmuir, 2012, 28 (33), 12304-12310.