Dr SUM Tze Chien

Journal Publications

Current Research

2012

1.    B. Wu, X. Liu, T. Z. Oo, G. C. Xing, N. Mathews and T. C. Sum*, “Resonant Aluminum Nanodisk Array for Enhanced Tunable Broadband Light Trapping in Ultra-thin Bulk Heterojunction Organic Photovoltaic Devices”, Plasmonics, accepted - DOI: 10.1007/s11468-012-9358-0

2.    T. Z. Oo, N. Mathews, G. C. Xing, B. Wu, B. Xing, L. H. Wong, T. C. Sum and S. G. Mhaisalkar, “Ultrafine Au Networks as Plasmonic Antennae in Organic Photovoltaics”, Journal of Physical Chemistry C, 116, 6453 – 6458 (2012) - pdf

3.    M. J. Li, G. C. Xing, L. F. N. Ah Qune, G. Z. Xing, T. Wu, C. H. A. Huan, X. H. Zhang and T. C. Sum*, “Tailoring the Charge Carrier Dynamics in ZnO Nanowires”, Physical Chemistry Chemical Physics, 14, 3075 - 3082 (2012) - pdf

 

2011

  1. X. C. Dong, G. C. Xing, M. B. Chan-Park, W. H. Shi, N. Xiao, J. Wang, Q. Y. Yan, T. C. Sum, W. Huang and P. Chen, “The formation of a carbon nanotube-graphene oxide core-shell structure and its possible applications”, Carbon, 49, 5071-5078 (2011) – pdf
  2. S. Chakrabortty, G. C. Xing, Y. Xu, S. W. Ngiam, N. Mishra, T. C. Sum and Y. Chan, “Engineering Fluorescence in Au-Tipped, CdSe-Seeded CdS Nanoheterostructures”, Small, 7 2847–2852 (2011) – pdf
  3. G. C. Xing, S. Chakrabortty, S. W. Ngiam, Y. Chan and T. C. Sum*, “Three-photon absorption in Seeded CdSe/CdS Nanorod Heterostructures”, Journal of Physical Chemistry C, 115, 17711-17716 (2011) – pdf
  4. L. T. Su, J. Ye, S. K. Karuturi, L. J.  Liu, Y. Zhao, J. Guo, L. F. N. A. Qune, T. C. Sum & A. I. Y. Tok, “High index, reactive facet-controlled synthesis of one-dimensional single crystalline rare earth hydroxide nanobelts”, CrystEngComm, 13, 5367 – 5373 (2011) - pdf
  5. X. Xu, Y. Zhao, E. J. Sie, Y. Lu, B. Liu, S. A. Ekahana, X. Ju, Q. Jiang, J. Wang, H. D. Sun,
    T. C. Sum*, C. H. A. Huan, Y. P. Feng, and Q. Xiong*, “Dynamics of Bound Exciton Complexes in CdS Nanobelts”, ACS Nano, 5, 3660 (2011) – pdf
  6. G. Z. Xing, G. C. Xing, M. J. Li, E. J. Sie, D. D. Wang, A. Sulistio, Q. L. Ye, C. H. A. Huan, T. Wu and T. C. Sum*, “Charge Transfer Dynamics in Cu-doped ZnO nanowires”, Applied Physics Letters 98 (2011) - (See also Virtual Journal of Nanoscale Science & Technology, 23, No. 11 (2011)) – pdf
  7. J. Q. Chen, X. Wang, Y. H. Lu, A. R. Barman, G. J. You, G. C. Xing, T. C. Sum, S. Dhar, Y. P. Feng, Ariando Q. H. Xu, T. Venkatesan, “Defect dynamics and spectral observation of twinning in single crystalline LaAlO3 under subbandgap excitation”, Applied Physics Letters, 98, 041904 (2011) – pdf

 

2010

1.    B. Liu, C. W. Cheng, R. Chen, S.A Ekahana, W. F. Yang, S. J. Wang, T. C. Sum, Z. X. Shen, H. J. Fan & H. D. Sun, “Surface plasmon induced exciton redistribution in ZnCdO/ZnO coaxial multiquantum-well nanowires”, Applied Physics Letters, 97, 081107 (2010) – pdf

2.    G. C. Xing, S. Chakrabortty, K. L. Chou, N. Mishra, C. H. A. Huan, Y. Chan and T. C. Sum*, “Enhanced Tunability of the Multi-photon Absorption Cross-Section in Seeded CdSe/CdS Nanorod Heterostructures”, Applied Physics Letters 97 061112 (2010) - (See also Virtual Journal of Nanoscale Science & Technology, 22, No. 9 (2010)) – pdf

3.    X. D. Lim, H. R. Xu, Y. H. N. Chew, Y. H. Phua, E. J. Sie, T. C. Sum, G. H. Chia, W. S. Chin & C. H. Sow, “Nanoparticle fractionation using an aligned carbon nanotube array”, Nanotechnology, 21, 295702 (2010) – pdf

4.    T. Z. Oo, N. Mathews, T. L. Tam, G. C. Xing, T. C. Sum, A. Sellinger, L. H. Wong & S. G. Mhaisalkar, “Investigation of photophysical, morphological and photovoltaic behavior of poly(p-phenylene vinylene) based polymer/oligomer blends”, Thin Solid Films, 518, 5292-5299 (2010) – pdf      

5.    G. Z. Xing, X. S. Fang, Z. Zhang, D. D. Wang, X. Huang, J. Guo, L. Liao, Z. Zheng, H. R. Xu, T. Yu, Z. X. Shen, C. H. A. Huan, T. C. Sum, H. Zhang & T. Wu, “Ultrathin single-crystal ZnO nanobelts: Ag-catalyzed growth and field emission property”, Nanotechnology, 21, 255701 (2010) – pdf 

6.    G. Z. Xing, D. D. Wang, J. B. Yi, L. L. Yang, M. Gao, M. He, J. H. Yang, J. Ding, T. C. Sum & T. Wu, “Correlated d0 ferromagnetism and photoluminescence in undoped ZnO nanowires”, Applied Physics Letters, 96, 112511 (2010) – pdf 

7.    C. W. Cheng, B. Liu, E. J. Sie, W. W. Zhou, J. X. Zhang, H. Gong, C. H. A. Huan, T. C. Sum*, H. D. Sun, & H. J. Fan*, “ZnCdO/ZnO Coaxial Multiple Quantum Well Nanowire Heterostructures and Optical Properties”, Journal of Physical Chemistry C, 114 3863 (2010) – pdf

8.    G. C. Xing, H. C Guo, X. H. Zhang, T. C. Sum* & C. H. A. Huan, “The Physics of ultrafast saturable absorption in graphene”, Optics Express 18 4564 (2010) - An OSA Spotlight on Optics article – pdf

9.    C. W. Cheng, E. J. Sie, B. Liu, C. H. A. Huan, T. C. Sum, H. D. Sun,and H. J. Fan, “Surface plasmon enhanced band edge luminescence of ZnO nanorods by capping Au nanoparticles”, Applied Physics Letters 96 071107 (2010) – pdf

 

2009

  1. F. X. Zang, T. C. Sum*, Furong Zhu, Z. R. Hong, X. Y. Sun, W. L. Li and C. H. A. Huan, “Modulated Infrared Electroluminescence from Organic Light-emitting Diodes”, Journal of Lightwave Technology 27 1522 (2009) – pdf
  2. G. Z. Xing, J. B. Yi, D. D. Wang, L. Liao, T. Yu, Z. X. Shen, C. H. A. Huan, T. C. Sum, J. Ding, and T. Wu, Strong correlation between ferromagnetism and oxygen deficiency in Cr-doped In2O3 nanostructures, Physical Review B, 79, 1 (2009) – pdf
  3. K. W. Liu, Y. D. Tang, C. X. Cong, T. C. Sum, C. H. A. Huan, Z. X. Shen, L. Wang, F. Y. Jiang, X. W. Sun, H. D. Sun, “Giant enhancement of top emission from ZnO thin film by nanopatterned Pt”, Applied Physics Letters 94 151102 (2009) – pdf
  4. T. L. Li, W. L. Li, B. Chu, Z. S. Su, Y. R. Chen, L. L. Han, D. Y. Zhang, X. Li, F. X. Zang, T. C. Sum and A. C. H. Huan, “Enhanced electroluminescence and reduced efficiency roll-off in electrophosphorescent devices using a very high electron mobility material as emitter host and electron transporter”,  Journal of Physics D: Applied Physics 42 065103 (2009) – pdf

 

2008

  1. G. Z. Xing, J. B. Yi, J. G. Tao, L. M. Wong, Z. Zhang, G. P. Li, S. J. Wang, J. Ding, T. C. Sum, A. C. H. Huan and T. Wu "Comparative Study of Structural Inhomogeneity Enhanced Room-Temperature Ferromagnetism in Cu-Doped ZnO Nanowires", Advanced Materials, 20, 3521 – 3527 (2008) – pdf
  2. S. L. Huang, L. X. Guan, J. B. Yi, B. C. Zhao, Y. Wu, Z. C. Fan, T. C. Sum, J. Ding, L. Wang, “Magnetic and electric transport properties of Nd0.75Sr1.25Co1-xMnxO4”, Journal of Applied Physics 104 123904 (2008) – pdf 
  3. F. X. Zang, T. C. Sum*, A. C. H. Huan, T. L. Li, W. L. Li and F. R. Zhu, "Reduced Efficiency Roll-off in Phosphorescent Organic Light Emitting Diodes at Ultra-high Current Densities by Suppression of Triplet-Polaron Quenching", Applied Physics Letters, 93 (2), 23309 (2008) – pdf
  4. Z. Zhang, J. B. Yi, J. Ding, L. M. Wong, H. L. Seng, S. J. Wang, J. G. Tao, G. P. Li, G. Z. Xing, T. C. Sum, A. C. H. Huan and T. Wu, "Cu-doped ZnO Nanoneedles and Nanonails: Morphological evolution and physical properties", The Journal of Physical Chemistry C, 112 (26), 9579 - 9585 (2008) – pdf

 

Earlier Publications (2000 – 2007) on Micro-optics and Applications of Nuclear Micro-beams and Proton Beam Writing

  1. T. C. Sum*, A. A. Bettiol, Catalin Florea and F. Watt, "Proton Beam Writing of Poly-methylmethacrylate Buried Channel Waveguides", Journal of Lightwave Technology, 24 (10), 3803 – 3809 (2006)
  2. A. A. Bettiol, S. Venugopal Rao, T. C. Sum, J. A. van Kan and F. Watt, “Fabrication of Optical Waveguides using Proton Beam Writing”, Journal of Crystal Growth, 288, 209 – 212 (2006)
  3. T. C. Sum*, A. A. Bettiol, J. A. van Kan, S. Venugopal Rao, F. Watt, K. Liu and E. Y. B. Pun, “Direct imaging of the end-of-range and surface profiles of proton-beam written erbium-doped waveguide amplifiers by atomic force microscopy”, Journal of Applied Physics, 98, 033533 - 033537 (2005)
  4. T. C. Sum*, A. A. Bettiol, K. Liu, M. Q. Ren, E. Y. B. Pun, S. Venugopal Rao, J. A. van Kan and F. Watt, “Proton Beam Writing of Erbium Doped Waveguide Amplifiers”; Nuclear Instruments and Methods in Physics Research B, 231, 394 – 399 (2005)
  5. A.A. Bettiol, T. C. Sum, F.C. Cheong, C.H. Sow, S. Venugopal Rao, J.A. van Kan, E.J. Teo, K. Ansari, F. Watt, “A Progress Review of Proton Beam Writing Applications in Microphotonics”; Nuclear Instruments and Methods in Physics Research B, 231, 364 – 371 (2005)
  6. Jeroen A. Van Kan, Andrew A. Bettiol, Kambiz Ansari, Ee Jin Teo, Tze Chien Sum, Frank Watt, “Proton Beam Writing: A Progress Review”, International Journal of Nanotechnology, 1, No. 4, 464 - 479 (2004)
  7. T. C. Sum*, A. A. Bettiol, H. L. Seng, J. A. van Kan and F. Watt, “Direct Measurement of Proton-Beam-Written Polymer Optical Waveguide Sidewall Morphology using an Atomic Force Microscope”; Applied Physics Letters, 85, No. 8, 1398 – 1400 (2004). (See also Virtual Journal of Nanoscale Science and Technology, 10, No. 9 (2004))
  8. K. Liu, E. Y. B. Pun, T. C. Sum, A. A. Bettiol, J. A. van Kan and F. Watt, “Erbium doped Waveguide Amplifiers Fabricated Using Focused Proton Beam Direct-writing”, Applied Physics Letters, 84, No. 5, 684 – 686 (2004) – This work was also highlighted in Laser Focus World Newsbreaks Vol. 40, Issue 3, “Proton beam writes erbium-doped waveguide amplifiers” – pdf file.   
  9. T. C. Sum*, A. A. Bettiol, J. A. van Kan, F. Watt, E. Y. B. Pun and K. K. Tung; “Proton Beam Writing of Low-loss Polymer Optical Waveguides”; Applied Physics Letters, 83, No. 9, 1707 – 1709 (2003)
  10. T. C. Sum*, A. A. Bettiol, H. L. Seng, I. Rajta, J. A. van Kan and F. Watt; “Proton Beam Writing of Passive Waveguides in PMMA”; Nuclear Instruments and Methods in Physics Research B, 210, 266 – 271 (2003)
  11. A. A. Bettiol, T. C. Sum, J.A. van Kan and F. Watt; “Fabrication of Micro-Optical Components in Polymer using Proton Beam Micromachining and Modification”; Nuclear Instruments and Methods in Physics Research B, 210, 250 – 255 (2003)
  12. H. L. Seng, T. Osipowicz, T. C. Sum, E. S. Tok, M. B. H. Breese, J. Zhang and F. Watt; “High Resolution Channeling Contrast Microscopy of Compositionally-Graded Si1-xGex Layers”; Nuclear Instruments and Methods in Physics Research B, 210, 483 – 488 (2003)
  13. H. L. Seng, T. Osipowicz, T. C. Sum, E. S. Tok, G. Breton, N. J. Woods, and J. Zhang; “Probing the SiGe Virtual Substrate By High-Resolution Channeling Contrast Microscopy”; Applied Physics Letters, 80, 2940 – 2942 (2002)
  14. H. L. Seng, T. Osipowicz, D. Mangelinck, P. S. Lee, T. C. Sum and F. Watt; “Micro-RBS Study of Nickel Silicide Formation”; Nuclear Instruments and Methods in Physics Research B, 181, 399 – 403 (2001) 
  15. J. A. Van Kan, A. A. Bettiol, B. S. Wee, T. C. Sum, T. Osipowicz and F. Watt; Proton Beam Micromachining: A New Tool for Precision 3D Microstructures; Sensors & Actuators A, 92, 370 – 374 (2001)
  16. A. A. Bettiol, J. A. Van Kan, T. C. Sum, T. Osipowicz and F. Watt; A LabviewTM Based Scanning and Control System for Proton Beam Micromachining; Nuclear Instruments and Methods in Physics Research B, 181, 49 – 53 (2001)
  17. T. Osipowicz, J. A. Van Kan, T. C. Sum, J. L. Sanchez, F. Watt; The Use of Microbeams for the Production of Microcomponents; Nuclear Instruments and Methods in Physics Research B, 161 – 163, 83 – 89 (2000)
  18. J. A. Van Kan, T. C. Sum, T. Osipowicz and F. Watt; Sub 100 nm Proton Beam Micromachining: Theoretical Calculations on Resolution Limits; Nuclear Instruments and Methods in Physics Research B, 161 – 163, 366 – 370 (2000)

 

 

Conference Publications

1.   T. C. Sum, G. C. Xing, C. H. A. Huan, H. C. Guo & X. H. Zhang, “Probing Ultrafast Carrier-Carrier Scattering Dynamics in Epitaxial Graphene”, 2010 Conference on Lasers and Electro-optics (CLEO) and Quantum Electronics & Laser Science Conference (QELS), San Jose, CA, 2010 

2.    G. Z. Xing, J. B. Yi, D. D. Wang, L. Liao, T. Yu, Z. X. Shen, C. H. A. Huan, T. C. Sum, J. Ding & T. Wu, “Bound Magnetic Polarons Induced Ferromagnetism in Transition-Metal-Doped Oxide Nanostructures”, in 3rd IEEE International Nanoelectronics Conference, PKI Chu, Editors, INEC: 2010 3RD INTERNATIONAL NANOELECTRONICS CONFERENCE, VOLS 1 AND 2: 1120-1121, Hong Kong, PRC, 2010

3.      T. C. Sum*, A. A. Bettiol, S. Venugopal Rao, J. A. van Kan, A. Ramam and F. Watt, Proton Beam Writing of Passive Polymer Optical Waveguides, in Micomachining Technology for Micro-optics and Nano-optics II, Eric G. Johonson and Gregory P. Nordin, Editors, Proceedings of SPIE 5347, pages 160 - 169 (Paper presented in an Oral Presentation at Photonics West 2004, San Jose, California, USA).

4.    A. A. Bettiol, K. Ansari, T. C. Sum, J. A. van Kan and F. Watt, Fabrication of Micro-optical Components in Polymer using Proton Beam Writing, in Micromachining Technology for Microoptics and Nanooptics II, Eric G. Johnson and Gregory P. Nordin, Editors, Proceedings of SPIE 5347, pages 255 - 263.

5.    K. Liu, E. Y. B. Pun, T. C. Sum, A. A. Bettiol, J. A. van Kan and F. Watt, "Erbium doped waveguide amplifier fabricated using focused proton beam irradiation", Proceedings of the 16th Annual Meeting IEEE Lasers and Eletro-Optics Society (LEOS 2003), Vol.1, 132 – 133, Tucson, AZ, USA, 2003.

6.      K. Liu, E. Y. B. Pun, T. C. Sum, A. A. Bettiol, J. A. van Kan and F. Watt, "Waveguide amplifiers in Er3+-Yb3+ co-doped phosphate glasses written with focused proton beam", Proceedings of the 4th IEEE Hong Kong AP/MTT and LEOS Postgraduate Conference, 81 – 84, Oct.18, 2003.


 

 

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