XU Qing-Hua

XU Qing-Hua

Associate Professor

Personal Web Page

Postdoc., Stanford University and University of California at Santa Barbara; Ph.D., UC Berkeley; M.Sc., Peking University and University of Chicago; B.Sc., Zhejiang University.

Contact Information:

Office: S8-02-05C

Tel: (65)-6516-7880

Fax: (65)-6779-1691

Email: chmxqh@nus.edu.sg

Research

ORCID: 0000-0002-4153-0767
ResearcherID: B-1478-2013

Recognition and Achievements

• Outstanding Chemist Award, Faculty of Science, NUS, 2015
• Young Scientist Award, Faculty of Science, NUS, 2008

Research Interests

Our primary interest includes nonlinear optical properties of novel nanocomposite materials and their applications in biomedicine and energy areas. Our research spans a broad range from materials preparation, fundamental understanding to practical applications. Specific foci are:

• Materials Chemistry and Physics
• Biosensing, Imaging and Phototherapy
• Nanomaterials and Photocatalysis
• Optical spectroscopy and imaging

Research Highlight

Ref: Shi, J.; Lin, Z.; Zhu, Z.; Zhou, J.; Xu, G. Q.; Xu, Q.-H., Probing Excitonic Rydberg States by Plasmon Enhanced Nonlinear Optical Spectroscopy in Monolayer WS2 at Room Temperature. ACS Nano 2022, 16, 15862-15872. A hybrid nanostructure of monolayer WS2 integrated with a plasmonic cavity was designed and its NLO properties was investigated at the single particle level. Giant enhancement in NLO response and improved spectral resolution were achieved, which allowed us to distinguish discrete excitonic states with small energy differences at room temperature.

Teaching Contributions AY2023/2024

• CM5237 Advanced Optical Spectroscopy and Imaging

Representative Publications 

• Wu, X. ; Zhang, X.; Yu, W.; Zhou, Y.; Wong, W.P.D.; He, W.; Loh, K.P.; Jiang, X.; Xu, Q.-H., Indirect-to-Direct Bandgap Transition in Layered Metal Halide Perovskite-CsPb2Br5. J. Mater. Chem. A 2023, 11, 4292-4301.
• Shi, J.; Lin, Z.; Zhu, Z.; Zhou, J.; Xu, G. Q.; Xu, Q.-H., Probing Excitonic Rydberg States by Plasmon Enhanced Nonlinear Optical Spectroscopy in Monolayer WS2 at Room Temperature. ACS Nano 2022, 16, 15862-15872.
• Tian, S.; He, J.; Lyu, D.; Li, S.; Xu, Q.-H., Aggregation enhanced photoactivity of photosensitizer conjugated metal nanoparticles for multimodal imaging and synergistic phototherapy below skin tolerance threshold. Nano Today 2022, 45, 101354.
• Wang, F.; Li, X.; Chen, Z.; Yu, W.; Loh, K. P.; Zhang, B.; Shi, Y.; Xu, Q.-H., Efficient low-frequency microwave absorption and solar evaporation properties of γ-Fe2O3 nanocubes/graphene composites. Chem. Eng. J. 2021, 405, 126676.
• Li, K.; Wang, L.; Chen, Z.; Yang, X.; Yu, Y.X.; Zhang, W.D.; Wang, Y.; Shi, Y.; Loh, K.P.; Xu, Q.-H., Photocatalytic Hydrogen Evolution under Ambient Conditions on Polymeric Carbon Nitride/Donor‐π‐Acceptor Organic Molecule Heterostructures. Adv. Funct. Mater. 2020, 30, 2005106.
• Chen, Z.; Zhang, Q.; Zhu, M. L.; Wang, X. Y.; Wang, Q.; Wee, A. T. S.; Loh, K.P.; Eda, G.; Xu, Q.-H., Synthesis of (C4H9NH3)2PbI4 Two-Dimensional Perovskite by Inverse Temperature Crystallization and Studies of Exciton States by Two-Photon Excitation Spectroscopy. Adv. Funct. Mater. 2020, 30, 202002661.
• Chen, Z.; Gallo, G.; Sawant, V. A.; Zhang, T. X.; Zhu, M. L.; Liang, L. L.; Chanthapally, A.; Bolla, G.; Quah, H. S.; Liu, X.G.; Loh, K.P.; Dinnebier, R. E.; Xu, Q.‐H.; Vittal, J. J., Giant Enhancement of Second Harmonic Generation Accompanied by the Structural Transformation of 7-Fold to 8-Fold Interpenetrated Metal–Organic Frameworks (MOFs). Angew. Chemie Int. Ed. 2020, 59, 833-838.
• He, J.; Li, S.; Lyu, D.; Zhang, D.F.; Wu, X.; Xu, Q.H., Aggregation Induced Emission Enhancement by Plasmon Coupling of Noble Metal Nanoparticles. Mater. Chem. Front. 2019, 3, 2421-2427.
• Guan, Z. P.; Zhang, T. S.; Zhu, H.; Lyu, D.; Sarangapani, S.; Xu, Q.-H.; Lang, M. J., Simultaneous Imaging and Selective Photothermal Therapy through Aptamer Driven Au Nanosphere Clustering. J. Phys. Chem. Lett. 2019, 10, 183-188.
• Yuan, P.Y.; Ding, X.; Yang, Y. Y.; Xu, Q.-H., Metal Nanoparticles for Diagnosis and Therapy of Bacterial Infection. Adv. Healthcare. Mater. 2018, 7, 1701392.