Tian-Zi Shen Professor School of Instrumentation & Optoelectronic Engineering, Research Area： Liquid crystal of 2D materials、Low Power Display Devices Major Enrollment： 080300: Optical Engineering (MS and Ph.D) 085400: Electrical & Electronic Engineering（MS and Ph.D) E-mail：shentianzi@buaa.edu.cn Research Experience 2020.01- Now School of Instrumentation Optoelectronic Engineering, Beihang University Professor 2016.03-2019.12 School of Electronic & Electrical Engineering Sungkyunkwan University, (Korea) Assistant Professor Education Sep.2012–Mar.2016 Ph.D.in School of Electronic & Electrical Engineering Sungkyunkwan University, Korea Mar.2009–Sep.2012 M.S. in Department of Nano Science and Technology, SAIN Sungkyunkwan University, Korea Mar.2005–Mar.2009 B.S. in Information & Communication Engineering Kangwon National University, Korea. Honors and Awards 2021“Outstanding Supervisor of Summer Production Internship” Beihang University (July.2021) 2020 International Information Display Conference（SID）“Young Laader”(May. 2020) 2017 “Outstanding Research Award of the Year” National Research Foundation of Korea (NRF) (Nov.2017) 2015 “Outstanding Self-financed International Student Award” Ministry of Education of China (May.2015) 2008 “Best Foreign Graduate” Kangwon National University Research Funding 1.Research Fund of International Young Scientists “New liquid crystal materials and display technology” NRFC，(2022～2024) 2.BUAA-Young Researcher Support Program “The mechanisms of field induced Graphene oxide liquid crystals alignment” BUAA (2020～2023) 3.“Overseas Talent Research Support Program” National Research Foundation of Korea (NRF) (2016～2019) 4.“Graphene oxide and two-dimensional liquid crystal materials for display technology applications” Samsung Electronics Future Technology Institute, Korea (2014～2019) 5.“Graphene Photodetector”Samsung Electronics Technology Research Institute Korea, (2009～2012)
Research Highlights (selected)
1. Research on Graphene oxide Liquid Crystal Research Focuses：The sensitive response of the nematic graphene oxide (GO) phase to external stimuli makes this phase attractive for extending the applicability of GO and reduced GO to solution processes and electro-optic devices. However, contrary to expectations, the alignment of nematic GO has been di‑cult to control through the application of electric fields or surface treatments. Here, we show that when interflake interactions are su‑ciently weak, both the degree of microscopic ordering and the direction of macroscopic alignment of GO liquid crystals (LCs) can be readily controlled by applying low electric fields. We also show that the large polarizability anisotropy of GO and Onsager excluded-volume eect cooperatively give rise to Kerr coe‑cients that are about three orders of magnitude larger than the maximum value obtained so far in molecular LCs. The extremely large Kerr coe‑cient allowed us to fabricate electro-optic devices with macroscopic electrodes, as well as well-aligned, defect-free GO over wide areas [Nature Materials, 13 394-399 (2014)]。 An exploratory study was conducted to investigate the possibility of commercializing graphene oxide liquid crystals, firstly, to improve the performance of the "on/off time" of the devices by screening the size of the liquid crystal material, for this series of studies please refer to [Optics Express, 23(4), 4435-4440 (2015).[Carbon, 105, 8-13 (2016)][ Journal of Physical Chemistry C, 118(45), 26304-26312 (2014). 2. Advanced liquid crystal materials investigative and apply Many nanomaterials have a layered structure and spontaneously produce Bragg reflection phenomena in the solution state. These materials provided a lot of inspiration for ongoing research Research Focuses：Graphene oxide liquid crystals has layered structure exhibit Bragg reflection properties, and two rounds of Bragg reflection cycles are reported for the first time through material synthesis for graphene oxide liquid crystals as the concentration changes. The liquid crystal material was found to achieve full coverage of visible light wavelengths through optical testing. It is further demonstrated theoretically that the Bragg reflection, represented by graphene oxide as a two-dimensional nanocrystalline material, is caused by the spontaneous column-phase ordering of the liquid crystal. For more informationplease：[NPG Asia Materials, 8, e296]. Research Focuses：We prepared layered nano layer liquid crystald, the best electro-optical effect of the device was achieved by comparing the synthesized particle size of zinc hypophosphite in the range of 400 nm ± 50 nm and the particle surface charge of -47ev. The on time of this new material was observed to be 0.005 sec. The off time was 0.01 sec. which is two orders of magnitude higher than that of graphene oxide liquid crystal and has excellent prospects for commercial applications. The US and Korean patents for this series of research were granted in 2020 and 2019, respectively, and the related work were published in [Advanced Materials, 30(40), 1802441 2018] [RSC Advances,8(30),16549-16556 2018][ Optics Express, 26(1), 2018] Publications Journals 1.T.-Z. Shen, S.-H. Hong, and J. K. Song *, "Electro-optical switching of graphene-oxide liquid crystals with an extremely large Kerr coefficient“, Nature Materials, 13 394-399 (2014) 2 .T. Z. Shen, S. H. Hong, J. H. Lee, S. G. Kang, B. Lee, D. Whang*, and J. K. Song*,"Selectivity of Threefold Symmetry in Epitaxial Alignment of Liquid Crystal Molecules on Macro scale Single-Crystal Graphene", Advanced Materials, 30(40), 1802441 (Oct, 2018) 3.T. Z. Shen, S. H. Hong, Bomi Lee, and J. K. Song* "Bottom-up & top-down manipulations for multi-order photonic crystallinity in a graphene-oxide colloid", NPG Asia Materials Nature (2016) 4.K. R. Wijewardhana#, T. Z. Shen#, E. N. Jayaweera, A. Shahzad, and J. K. Song*,"Hybrid nanogenerator and enhancement of water-solid contact electrification using triboelectric chargesupplier", Nano Energy, 52, 402-407, (Oct, 2018) 5.T.-Z. Shen, S.-H. Hong, and J. K. Song *, "Effect of centrifugal cleaning on the electro-optical response in the preparation of aqueous graphene-oxide dispersions",Carbon, 80, 560-564 (2014). 6.T. Z. Shen, S. H. Hong, J. K. Guo, and J. K. Song*,"Deterioration and recovery of electro-optical performance of aqueous graphene-oxide liquid-crystal cells after prolonged storage",Carbon, 105, 8-13 (2016) 7.S.-H. Hong#, T.-Z. Shen#, and J. K. Song *,"Electro-optical characteristics of aqueous graphene-oxide dispersion depending on ion concentration”, Journal of Physical Chemist ry C, 118(45), 26304-26312 (2014). 8.Priyadharshana,P.A.N.S., T. Z. Shen,, S. H. Hong, J.-K. Song, “Widely Tunable GRIN Lenses Using Negative Dielectrophoretic Manipulation of Phosphate Nanosheets Colloid.”, Adv. Optical Mater,10, 2102429(2022) 9.J. M. Choi, T. Z. Shen, J. K. Vij, J. H. Lee*, and J. K. Song*, “Thermochromic luminescence in dual-dye-doped liquid crystal mixture induced by varying the energy transfer rate”, Dyes and Pigments, 180, 108450 (Sep, 2020) 10.S. H. Hong, T. Z. Shen, and J. K. Song*, "Dual-field-induced biaxial nematic ordering of two-dimensional nanoparticles and enhancement of interparticle interactions", Physical Review E, 100(2), 020701 (Aug, 2019) 11.B. Wang, Y. B. Kang, T. Z. Shen, J. K. Song, H. S. Park, and J. H. Kim*,“Ultralight and compressible mussel-inspired dopamine conjugated poly(aspartic acid)/Fe3+-multifunctionalized graphene aerogel”, Journal of Materials Science, 53(24), 16484-16499, (Dec, 2018) 12.S. H. Hong, T. Z. Shen, and J. K. Song*, "Particle size dependence of electro-optical s witching in ZrP nano colloid" Liquid Crystals, (Jun, 2018) 13.A. R. Masud, S. H. Hong, T. Z. Shen, A. Shahzad, and J. K. Song*, "Electrically and electrohydrodynamically driven phase transition and structural color switching of oligomer tethered 2D colloid", RSC Advances, 8(30), 16549-16556, (May, 2018) 14.S. H. Hong, T. Z. Shen, and J. K. Song*, "Shear-induced assembly of graphene oxide particles into stripes near surface”, Liquid Crystals, 45(9), 1303-1311, (Feb, 2018) 15.A. R. Masud, S. H. Hong, T. Z. Shen, C. H. Ahn, and J. K. Song*, "Electrical switching of birefringence in zirconium phosphate colloids with various solvents", Optics Express, 26(1), 173-178, (Jan, 2018) 16.D. H. Song, S. H. Song, T. Z. Shen, J. S. Lee, W. H. Park, S. S. Kim*, and J. K. Song*, "Quantum dot light-emitting diodes using a graphene oxide/PEDOT:PSS bilayer as hole injection layer", RSC Advances, 7, 43396-43402, (Sep, 2017) 17.A. R. Masud, S. H. Hong, T. Z. Shen, C. H. Ahn, and J. K. Song*,"Electrical switching o f birefringence in zirconium phosphate colloids with various solvents", Optics Express, 26(1), 173-178, (Jan, 2018) 18.S. H. Hong, T. Z. Shen and J. K. Song*,"Shear-induced assembly of graphene oxide particles into stripes near surface", Liquid Crystals, (Feb, 2018) 19.K. R. Wijewardhana, T. Z. Shen, and J. K. Song*,"Energy harvesting using air bubbles on hydrophobic surfaces containing embedded charge", Applied Energy, 206, 432-438, (Sep, 2 017) 20.T. K. Ekanayaka, S. H. Hong, T. Z. Shen, and J. K. Song*,"Effect of solvents on photonic crystallinity in graphene oxide dispersions", Carbon, 123, 283-289, (Oct, 2017) 21.K. R. Wijewardhana, T. Z. Shen, M. R. Vengatesan, J. S. Kim, H. Y. Lee and J. K. Song*, "Electrophoretic assembly and topological weaving of crumpled two-dimensional sheets wit h entangled defect loops" Carbon, 119, 211-218, (Apr, 2017) 22.S. H. Hong, T. Z. Shen, and J. K. Song*,"Dielectrophoretic Condensation and Tailored P hase Separation in Graphene Oxide Liquid Crystals", Particle & Particle Systems Characterization, (F eb, 2017) 23.S. H. Hong, T. Z. Shen, and J. K. Song*,"Controlling wrinkles and assembly patterns in dried graphene oxide films using lyotropic graphene oxide liquid crystals", Liquid Crystals, 44(6), 939-947 (2017) 24.R. T. M. Ahmad, T. Z. Shen, and J. K. Song*,"Guided Electro-Optical Switching of Small Graphene Oxide Particles by Larger Ones in Aqueous Dispersion", Langmuir, 32(50), 13458-13463 (Nov, 2016) 25.S. H. Hong, T. Z. Shen, B. Lee, and J. K. Song*, "Dielectrophoretic Condensation and Tailored Phase Separation in Graphene Oxide Liquid Crystals", Particle & Particle Systems Characterization, 10.1002/ppsc.201600344 (Feb, 2017) 26.R. T. M. Ahmad, S. H. Hong, T. Z. Shen, Y. S. Kim and J. K. Song*,"Electric Field-ind uced Ordering of Reduced Graphene Oxide Particles in Colloid", Journal of Nanoscience and Nanotechnology 16(11), 11364-11368 (Nov, 2016) 27.S. H. Hong, T. Z. Shen, and J. K. Song*,"Controlling wrinkles and assembly patterns in dried graphene oxide films using lyotropic graphene oxide liquid crystals", Liquid Crystals, 28.S. H. Hong, T. Z. Shen, and J. K. Song*,"Water front recession and the formation of various types of wrinkles in dried graphene oxide droplets", Carbon 105, 297-304 (201 6). 29.S. H. Hong, T.Z. Shen, & J. K. Song*,"Manipulation of structural color reflection in graphene oxide dispersions using electric fields”, Optics Express, 23 (15), 18969-189 74 (2015). 30.S. H. Hong, T.Z. Shen, & J. K. Song*,."Flow-induced alignment of disk-like graphene ox ide particles in isotropic and biphasic colloids”, Molecular Crystals and Liquid Crystals, 610(1), 68-76, (2015). 31.R. T. M. Ahmad, Seung Ho Hong, T.Z. Shen, and Jang-Kun Song* "Optimization of particle size for high birefringence and fast switching time in electro- optical switching of graphene oxide dispersions", Optics Express, 23(4), 4435-4440 (2015). 32.S.H. Hong, T.Z. Shen, and J. K. Song *,."Flow-induced ordering of particles and flow velocity profile transition in a tube flow of graphene-oxide dispersions”, Liquid Crystals, 42(2), 261-269 (2015). 33.R. T. M. Ahmad, Seung Ho Hong, T. Z. Shen, and Jang-Kun Song*,"Water-assisted stable dispersal of graphene oxide in non-dispersible solvents and skin formation on the GO di spersion”, Carbon, 98,188-194 (2015). 34.R. T. M. Ahmad, S. H. Hong, T. Z. Shen, and J. K. Song*,."Effect of solvents on the el ectrooptical switching of graphene oxide dispersions”, Applied Physics Letters, 108(2 5), 251903 (2016) 35.Yeong-Dae Lim, Dae-Yeong Lee, T. Z. Shen, and Won Jong Yoo*,."Si-Compatible Cleaning P rocess for Graphene Using Low-Density Inductively Coupled Plasma”, ACS Nano, 6, 4410 (2012). 36.H M Li, G Zhang, T. Z. Shen and W.J. Yoo*,”."Enhancement of Light Absorption Using High-k Dielectric in Localized Surface Plasmon Resonance for Silicon-based thin film solar cells”, J. Appl. Phys. 109, 093516 (2011). 38.G. Zhang, C.H. Ra, H.-M. Li, T. Z. Shen, B.-k. Cheong, and W. J. Yoo*,“Modified potential well formed by Si/SiO2/TiN/TiO2/SiO2/TaN for flash memory application”IEEE TED, 57(11) 2794-2800 (2010). Patents 1. T. Z Shen W. j Yoo H. M Li M. S Choi J. Y Choi "Two-dimensional material stacked flexible photosensor" US (United States of America) Patent 20140231886A1 2. J. Y Choi W. j Yoo C. H Ra T. Z SHEN “Graphene-based photodetector including complex transparent electrode, method of manufacturing the same, and device including the same” US (United States of America) Patent 20130126700A1 3. J. K Song T. Z SHEN “Optical element” US(United States of America) Patent 10830934A1 4.송장근 홍승호 심전자 그래핀 옥사이드 필름 제조방법(METHOD OF GRAPHENE OXIDE FILM) KR (Republic of Korea) Patent:1020150186068 5.송장근 심전자 홍승호 그래핀 옥사이드 정렬방법,그래핀옥사이드 이동방법및 그것을 이용한 광학 디바이스(Method of alignment of graphene oxide, Method of moving of graphene oxide and optical device using the same) KR (Republic of Korea) Patent:1020130118698 6.송장근 심전자 홍승호 광학 셀 제조방법(Reflective optical device fabrication using graphene oxide) KR(Republic of Korea) Patent:1020150186065) 7.송장근 홍승호 심전자 디스플레이 제어방법 및 그것을 이용한 광학 디바이스(DISPLAY CONTROL METHOD AND OPTICAL DEVICE USING THE SAME) KR (Republic of Korea) Patent:1020160019197 8.송장근 심전자 홍승호 그래핀옥사이드 정렬방법, 그래핀옥사이드이 동방법및그것을이용한광학디바이스(Method of alignment of graphene oxide, Method of moving of graphene oxide and optical device using the same) KR(Republic of Korea) Patent:1016141000000 9.심전자 유원종 이화민 최민섭 최재영 2차원 소재 적층 플렉서블 광센서(Two-Dimensional Material Stacked Flexible Photosensor) KR(Republic of Korea) Patent:1020130016972 10.최재영 유원종 라창호 심전자 복합 투명 전극을 포함하는 그래핀 기반 포토 디텍터와 그 제조방법 및 포토 디텍터를 포함하는장치(Graphene based photodetector comprising complex transparent electrode, method of manufacturing the same and device comprising the same) KR(Republic of Korea) Patent:102011012172) |
