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Dr. Linan An Linan An, Ph.D.
Professor, MMAE
Phone: 407-823-1009
E-mail: Linan.An@ucf.edu

Education

  • Ph.D. — Lehigh University, 1996

Research

  • Micro-fabrication of ceramics for MEMS applications
  • Processing structure property relationships of ceramic materials
  • Polymer-derived ceramics
  • Nano-materials/composites: synthesis and properties
  • Mechanical behavior of materials: fracture, toughening, creep, wear and fatigue

Dr. An's research lies in the following general areas: processing-structure-property relationships of ceramic materials, microfabrication of ceramics for extreme environmental MEMS, nano- and microstructure design for improving properties of ceramics and their composites and mechanical property characterization with indentation techniques.


Polymer-derived SiCN ceramic micro-gear of 200mm diameter and 40mm thickness, fabricated with the micro-casting technique

In particular, Dr. An's recent research focuses on polymer-derived ceramics (PDC) synthesized by thermal decomposition of polymer precursors at 400-1000 oC. This new class of materials, based on amorphous alloys of silicon, carbon, boron and nitrogen, exhibits excellent mechanical and thermal properties up to 1800 oC, promising for ultrahigh temperature applications. The nanostructures and composites, thereby the properties, of PDCs can be tailored by modifying the chemistry of the precursors. This offers a unique opportunity to manipulate materials at atomic level to achieve improved properties and multifunctional behavior. The chemical route is also leading to cost-efficient and flexible manufacturing techniques for the fabrication of ceramic components with these interesting materials. Dr. An's research group focuses on understanding nanostructure-properties relationships, designing novel multifunctional materials and synthesizing ceramic composites such as carbon nanotube reinforced PDC.

Dr. An's group also conducts research on developing micro-fabrication technologies for ceramic-based MEMS. The unique processing and properties of PDCs make the materials suitable for ceramic MEMS applications. Dr. An is developing both micro-stereolithography and micro-injection molding techniques for the fabrication of MEMS components/devices with 3D complex structures. The picture below is a ceramic micro-gear made from micro-casting technique.

Dr. An is also working on nano-phased ceramic metal matrix composites. The research focuses on designing nano/microstructures and interfacial properties to improve mechanical properties, such as yield strength, creep and fatigue resistance.

Selected Publications

J. Qu, H. Xu, Z. Feng, D.A. Frederick, L. An and H. Heinrich. “Improving the tribological characteristics of aluminum alloys by forming a nanocomposite surface layer using friction stir processing” Wear, 271, 1940-45 (2011).

Y. Wang, J. Ding, W. Feng and L. An. “Effect of pyrolysis temperature on the piezoresistivity of polymer derived ceramics” Journal of the American Ceramic Society, 94[2], 359-362 (2011).

T. Jiang, A. Hill, W. Fei, Y. Wei, M. Tellam, C. Xu and L. An. “Making bulk ceramics from polymeric precursors” Journal of the American Ceramic Society, 93[10], 3017-3019 (2010).

Y. Yu, L. An, Y. Chen and D. Yang. “Synthesis of SiFeC magnetoceramics from inverse polycarbosilane-based microemulsions” Journal of the American Ceramic Society, 93[10], 3324-3329 (2010).

F. Gao, Y. Wang, L. Zhang, W. Yang and L. An. “Optical properties of Al-doped single-crystal Si3N4 nanowires” Journal of the American Ceramic Society, 93[5], 1364-1367 (2010).

H. Wang, L. Lin, W. Yang, Z. Xie and L. An. “Preferred Orientation of SiC nanowires induced by substrates” Journal of Physical Chemistry C, 114[6], 2591-2594 (2010).

W. Yang, F. Gao, G. Wei and L. An. “Ostwald ripening growth of silicon nitride nanoplates” Crystal Growth & Design, 10, 29-31 (2010).

S. Sarkar, J. Zhou, C. Xu, L. An and L. Zhai. “Polymer-derived ceramic composite fibers with aligned pristine carbon nanotubes” ACS Materials & Interface, 2[4], 1150-1156 (2010).

M. Yang, C. Xu, Y. Chao, K. Lin, H. Yang and L. An. “Fabrication of AA6061/Al2O3 nano ceramic particle reinforced composite coating by using friction stir processing” Journal of Materials Science, 45, 4431-4438 (2010).

F. Yang and L. An. “Stress analysis of the field-assisted sintering: electrothermal mechanical interaction” International Journal of Applied Electromagnetic & Mechanics, 32, 125-132 (2010).

W. Yang, F. Gao, C. Xu, G. Wei and L. An. “Fabrication of Si3N4/SiC nanocomposites toughened by in-situ formed low-dimensional nanostructures” Solid State Science, 12, 1692-1695 (2010).

W. Yang, F. Gao, Y. Fan, and L. An. “Al-doped single-crystalline SiC nanowires synthesized by pyrolysis of polymer precursors” Journal of Nanoscience & Nanotechnology, 10[7], 4729-4732 (2010).

H. Wang, Z. Xie, W. Yang, Y. Wang, F. Xing and L. An. “Morphology instability of Si3N4 nanowires” Journal of Physical Chemistry C, 113, 5902-5905 (2009).

L. Zhang and L. An. “One-dimensional SiC/Si3N4: synthesis, growth mechanism, property and applications” Handbook of Nanoceramics and Their Based Nanodevices, eds. T. Tseng and H. S. Nalwa, American Scientific Publishers (ASP), 261-278, 2009.

Y. Zhao, L. An and J. Fang. “Buckling instability of lipid tubules with multilayer walls under local radial indentation” Physical Review E 80, 021911 (2009).

W. Yang, F. Gao, H. Wang, Z. Xie and L. An. “Asymmetric silicon nitride nanodendrites: addition and correction” Crystal Growth & Design, 9, 2020 (2009).

Y. Wang, T. Jiang, L. Zhang and L. An. “Optical absorption of polymer-derived amorphous silicon carbonitrides” Journal of the American Ceramic Society, 92[12], 3111-3113 (2009).

H. Wang, Z. Xie, Y. Wang, W. Yang, Q. Zeng, F. Xing and L. An. “Single-crystal AlN nanonecklaces” Nanotechnology, 20, 025611 (2009).

W. Yang, F. Gao, H. Wang, Z. Xie, F. Xing and L. An. “Hollow alumina chain networks” Journal of the American Ceramic Society, 92[1], 280-282 (2009).

T. Jiang, Y. Wang, Y. Wang, N. Orlovskaya and L. An. “Quantitative Raman analysis of free carbons in polymer-derived ceramics” Journal of the American Ceramic Society, 92[10], 2455-2458 (2009).

Y. Wang, T. Jiang, L. Zhang and L. An. “Electron transport in polymer-derived amorphous silicon oxycarbonitride ceramics” Journal of the American Ceramic Society, 92[7], 1603-1606 (2009).

J. Qu, H. Xu, Z. Feng, K. An, R. Battiste, H. Heinrich and L. An. “Forming Al-Al2O3 nanocomposite surfaces using friction stir processing” SME Transactions of NAMRI, 37, 349-356 (2009).

Y. Wang, L. Zhang, Y. Fan, D. Jiang and L. An. “Stress dependent piezoresistivity in tunneling-percolation systems” Journal of Materials Science, 44[11], 2814-2819 (2009).

Y. Wang, L. An, L.V. Saraf, C.M. Wang, V. Shutthanandan, D.E. McCready and S. Thevuthasan. “Fabrication and characterization of alternating-multilayer structures of gadolinia-doped ceria and zirconia grown by sputter-deposition” Journal of Materials Science, 44[8], 2021-2026 (2009).

Y. Zhao, K. Tamhane, X. Zhang, L. An and J. Fang. “Heterogeneous elasticity of self-assembled lipid tubules” ACS Nano, 2, 1466-1472 (2008).

W. Yang, F. Gao, H. Wang, Z. Xie and L. An. “Asymmetric Si3N4 nanodendrites” Crystal Growth & Design, 8[8], 2606-2608 (2008).

F. Gao, W. Yang, H. Wang, Y. Fan and L. An. “Controlled Al-doped single-crystalline 6H-SiC nanowires” Crystal Growth & Design, 8[5], 1461-1464 (2008).

H. Wang, Z. Xie, W. Yang, J. Fang and L. An. “Morphology control in the vapor-liquid-solid growth of SiC nanowires” Crystal Growth & Design, 8[11], 3893-3896 (2008).

W. Yang, X. Cheng, H. Wang, Z. Xie, F. Xing and L. An. “Bundled silicon nitride nanorings” Crystal Growth & Design, 8[11], 3921-3923 (2008).

Y. Wang, L. Zhang, W. Xu, T. Jiang, Y. Fan, D. Jiang and L. An. “Effect of thermal initiator concentration on electrical behavior of polymer-derived amorphous SiCN ceramics” Journal of the American Ceramic Society, 91 [12], 3971-3975 (2008).

K. Chen, X. Zhang, H. Wang, L. Zhang, F. Yang, J. Zhu and L. An. “Making nanostructured ceramics from micrometer-sized powders via grain refinement during SPS sintering” Journal of the American Ceramic Society, 91[8], 2475-2480 (2008).

L. Zhang, Y. Wang, Y. Wei, W. Xu, D. Fang, L. Zhai, K. Lin and L. An. “A silicon carbonitride ceramic with anomalously high piezoresistivity” Journal of the American Ceramic Society, 91[4], 1346-1349 (2008).

S. Sarkar, A. Chunder, W. Fei, L. An and L. Zhai. “Superhydrophobic mats of polymer derived ceramic fibers” Journal of the American Ceramic Society, 91[8], 2751-2755 (2008).

W. Yang, H. Wang, X. Cheng, Z. Xie and L. An. “Perfect single-crystal Al2O3 microspheres” Journal of the American Ceramic Society 91[8], 2732-2735 (2008).

W. Yang, F. Gao, H. Wang, Z. Xie and L. An. “Synthesis of ceramic nanocomposite powders via in-situ formation of nanowires/nanobelts” Journal of the American Ceramic Society, 91[4], 1312-1315 (2008).

F. Gao, W. Yang, Y. Fan and L. An. “Aligned ultra-long single-crystalline α-Si3N4 nanowires” Nanotechnology, 19, 105602 (2008).

F. Gao, W. Yang, Y. Fan and L. An. “Mass production of very thin single crystalline silicon nitride nanobelts” Journal of Solid State Chemistry, 181, 211-215 (2008).

J. Luo, S. Liu, Y. Fan, L. Wang, L. Zhang, P. Zhang and L. An. “Effect of mechanical milling on photoluminescence of γ-alumina nanoparticles” Journal of Nanoscience & Nanotechnology, 8[3], 1414-1416 (2008).

L. Wang, L. Zhang, Y. Fan, J. Luo, P. Zhang and L. An. “Effect of Nd-doping on the optical properties of YAG nanopowders” Journal of Nanoscience & Nanotechnology, 8[3], 1454-1457 (2008).

W. Yang, H. Wang, S. Liu, Z. Xie and L. An. “Catalyst and temperature dependent growth of silicon nitride micro/nanoribbons” Journal of Nanoscience & Nanotechnology, 8[8], 3926-3929 (2008).

Y. Zhao, L. An and J. Fang. “Buckling of self-assembled lipid tubules and helical ribbons in shrinking liquid droplets” Nano Letters, 7(5), 1360-1363, (2007).

S. Xu, Y. Fan, J. Luo, L. Zhang, W. Wang, B. Yao and L. An. “Phonon characteristics and photoluminescence of bamboo structured silicon-doped boron nitride nanotubes” Applied Physics Letters, 90[1], 013115 (2007).

W. Yang, H. Wang, S. Liu, Z. Xie and L. An. “Controlled Al-doped single-crystalline silicon nitride nanowires synthesized via pyrolysis of polymer precursors” Journal of Physical Chemistry B, 111, 4156-4160 (2007).

H. Wang, G. Liu, W. Yang, L. Lin, Z. Xie, J. Fang and L. An. “Bicrystal AlN zigzag nanowires” Journal of Physical Chemistry C, 111, 17169-17172 (2007).

W. Yang, Z. Xie, H. Miao, L. Zhang and L. An. “Catalyst-assisted pyrolysis of polymeric precursors: a new method to synthesize low-dimensional nanomaterials” Key Engineering Materials, 336-338, 2138-2141 (2007).

H. Wang, Z. Xie, W. Yang, G. Liu and L. An. “Fabrication of SiCN MEMS by UV lithography of polysilazane” Key Engineering Materials, 336-338, 1477-1480 (2007).

L. Zhang, W. Yang, H. Jin, Z. Zheng, Z. Xie, H. Miao and L. An. “Ultraviolet photoluminescence from 3C-SiC nanorods” Applied Physics Letters, 89[14], 143101 (2006).

S. Liu, L. Zhang, Y. Fan, J. Luo, P. Zhang and L. An. “Ultraviolet irradiation-induced photoluminescence degradation in g-alumina nanoparticles” Applied Physics Letters, 89[5], 051911 (2006).

W. Yang, Z. Xie, H. Miao, L. Zhang and L. An. “Coalescence of nanobranches: a new growth mechanism for single-crystalline nanobelts” Journal of Physical Chemistry B, 110, 3969-3972 (2006).

Y. Wang, Y. Fan, L. Zhang, W. Zhang and L. An. “Polymer-derived SiAlCN ceramics resist to oxidation at 1400oC” Scripta Materialia, 55, 295-297 (2006).

Y. Wang, W. Fei, Y. Fan, L. Zhang, W. Zhang and L. An. “A silicoaluminum carbonitride ceramic resist oxidation/corrosion in water vapor” Journal of Material Research, 21[7], 1625-1628 (2006).

L. Wang, L. Zhang, Y. Fan, J. Luo, P. Zhang and L. An. “Synthesis of Nd/Si Co-doped YAG powders via a solvothermal method” Journal of the American Ceramic Society, 89[11], 3570-3572 (2006).

Y. Wang, W. Fei and L. An. “Oxidation/hot-corrosion of polymer-derived SiAlCN ceramics in water vapor” Journal of the American Ceramic Society, 89[3], 1079-1082 (2006).

Y. Fan, Y. Wang, J. Lou, S. Xu, L. Zhang, H. Heinrich and L. An. “Formation of silicon-doped boron nitride bamboo structures via pyrolysis of polymeric precursor” Journal of the American Ceramic Society, 89[2], 740-742 (2006).

B. Prabhu, C. Suryanarayana, L. An and R. Vaidyanathan. “Synthesis and characterization of high volume fraction Al-Al2O3 nanocomposite powders by high-energy milling” Materials Science and Engineering A-Structural Materials Properties, Microstructure and Processing, 425, 192-200 (2006).

W. Yang, Z. Xie, H. Miao, L. Zhang and L. An. “Fabrication of Si3N4/SiC nanocomposites by spark plasma sintering of amorphous SiCN powders” Journal of Ceramic Processing Research, 7 (4): 307-310 (2006).

Y. Wang, Y. Fan, L. Zhang, Y. Sohn and L. An. “Oxygen diffusion through aluminum-containing amorphous SiO2” Journal of Phase Equilibria and Diffusion, 27, 671-675 (2006).

N.R. Nagaiah, J.S. Kapat, L. An and L. Chow. “Novel polymer derived ceramic-high temperature heat flux sensor for gas turbine environment” Journal of Physics: Conference Series, 34, 458-463 (2006).

N.R. Nagaiah, A.K. Sleiti, S. Rodriguez, J.S. Kapat, L. An and L. Chow. “A novel design and analysis of a MEMS ceramic hot-wire anemometer for high temperature applications” Journal of Physics: Conference Series, 34, 277-282 (2006).

L. Zhang, H, Jin, W. Yang, Z. Xie, H. Miao and L. An. “Optical properties of single-crystalline α-Si3N4 nanobelts” Applied Physics Letters, 86, 061908 (2005).

W. Yang, Z. Xie, H. Miao, L. Zhang, H. Ji and L. An. “Synthesis of single-crystalline silicon nitride nanobelts via catalyst-assisted pyrolysis of a polysilazane” Journal of the American Ceramic Society, 88[2], 466-469 (2005).

Y. Wang, Y. Fan, L. Zhang, S. Burton, Z. Gan and L. An. “Oxidation of polymer-derived SiAlCN ceramics” Journal of the American Ceramic Society, 88[11], 3075-3080 (2005).

S. Liu, W. Fei, L. Zhang, H. Heinrich and L. An. “Phase transformation of mechanically-milled nano-sized γ-alumina” Journal of the American Ceramic Society, 88[9], 2559-63 (2005).

A. Dhamne, W. Xu, B. Fookes, Y. Fan, L. Zhang, S. Burton, J. Hu, J. Ford and L. An. “Polymer-ceramic conversion of liquid polyaluminasilazanes for SiAlCN ceramics” Journal of the American Ceramic Society, 88[9], 2415-19 (2005).

W. Yang, Z. Xie, J. Li, H. Miao, L. Zhang, H. Ji and L. An. “Ultra-long single-crystalline α-Si3N4 nanowires: derived from a polymeric precursor” Journal of the American Ceramic Society, 88[6], 1647-50 (2005).

Y. Wang, C. Suryanarayana and L. An. “Phase transformation of γ-Al2O3 during high-energy ball milling” Journal of the American Ceramic Society, 88[3], 780-783 (2005).

W. Yang, Z. Xie, J. Ma, H. Miao, J. Luo, L. Zhang and L. An. “Polygonal single-crystalline aluminum borate microtubes” Journal of the American Ceramic Society, 88[2], 485-487 (2005).

Y. Wang, L. Zhang, Y. Fan, J. Luo, D. McCready, C. Wang and L. An. “Synthesis, characterization and optical properties of pristine and doped-YAG nanopowders” Journal of the American Ceramic Society, 88[2], 284-286 (2005).

W. Yang, Z. Xie, H. Miao, L. Zhang and L. An. “Simultaneous growth of silicon nitride nanobelts and nanodendrites by catalyst-assisted crystallization of amorphous SiCN” Journal of Crystal Growth, 276, 1-6 (2005).

H. Jin, L. Zhang, Z. Zheng, L. An, Y. Lu, J. Zhang, X. Fan, D. Shen. “Temperature-dependent photoluminescence in coupling structures of CdSe quantum dots and a ZnCdSe quantum well” Chinese Physics Letters, 6, 1518-21 (2005).

W. Yang, L. Zhang, X. Zhipeng, H. Miao and L. An. “Growth and optical properties of ultra-long single-crystalline α-Si3N4 nanobelts” Applied Physics A-Materials Science & Processing, 80, 1419-1423 (2005).

Z. Xie, W. Yang, H. Miao, L. Zhang and L. An. “Synthesis and growth mechanism of silicon nitride nanostructures” Materials Science Forum, 475-479, 1239-1242 (2005).

L. Zhang, Y. Fan, J. Lou, M. Chu, Y. Wang, L. Bharadwaj and L. An. “Silicoaluminum carbonitride with anomalously high resistance to oxidation and hot corrosion” Rare Metal Materials and Engineering, 34, 486-489 (2005).

Y. Fan, J. Luo, Y. Wang, S. Xu, M. Chu, W. Wang, L. Zhang and L. An. “The study on pyrolysis mechanism in Si-B-C-N polymer-to-ceramic transformation by FTIR and resonance Raman spectra” Rare Metal Materials and Engineering, 34, 490 (2005).

Y. Miao, S. Liu, J. Luo, Y. Wang, S. Xu, W. Wang, Y. Fan, L. Zhang, and L. An. “Preparation of SiCp/Al nano-composites with two-step sintering processing” Rare Metal Materials and Engineering, 34, 632 (2005).

P. Zhang, G. Wu, X. Chi, Y. Wang, S. Liu and L. An. “Preparation and properties of toughened colorful zirconia ceramics” Rare Metal Materials and Engineering, 34, 650 (2005).

Y. Wang, L. Zhang, S. Xu, Y. Miao, Y. Fan, W. Wang and L. An. “Electrical conductivity of amorphous Si-B-C-N precursor-derived ceramics” Rare Metal Materials and Engineering, 34, 948 (2005).

S. Xu, L. Zhang, Y. Wang, Y. Miao, Y. Fan, J. Luo, W. Wang and L. An. “Boron dopant dependence of electrical conductivity of amorphous SiCN ceramics” Rare Metal Materials and Engineering, 34, 952 (2005).

Y. Fan, J. Luo, W. Yang, Z. Xie and L. An. “Photoluminescence and photoluminescence excitation of single crystalline α-Si3N4 nanobelts” Rare Metal Materials and Engineering, 34, 956 (2005).

Y. Miao, W. Wang, M. Chu, Y. Fan, J. Luo, L. Zhang and L. An. “High temperature conductivity of amorphous SiCN ceramics” Journal of the Chinese Ceramics Society, 33, 789 (2005).

L. An, W. Xu, S. Rajagopalan, C. Wang, H. Wang, J. Kapat, L. Chow, Y. Fan, L. Zhang, D. Jiang, B. Guo, J. Liang and R. Vaidyanathan. “Carbon nanotube reinforced polymer-derived ceramic composites” Advanced Materials, 16[22], 2036-2040 (2004).

W. Yang, H. Miao, Z. Xie, L. Zhang and L. An. “Synthesis of silicon carbide nanorods by catalyst-assisted pyrolysis of polymeric precursor” Chemical Physics Letters, 383(5-6) 441-444 (2004).

L. Bharadwaj, Y. Fan, L. Zhang, D. Jiang and L. An. “Oxidation behavior of a fully dense polymer-derived amorphous silicon carbonitride ceramic” Journal of the American Ceramic Society, 87(3) 483-486 (2004).

W. Yang, Z. Xie, J. Li, H. Miao, L. Zhang and L. An. “Growth of platelike and branched single-crystalline Si3N4 whiskers” Solid State Communications, 132, 263-68 (2004).

L. An, Y. Wang, L. Bharadwaj, Y. Fan, L. Zhang, D. Jiang, Y. Sohn, V. Desai, J. Kapat and L. Chow. “Silicoaluminum carbonitride with anomalously high resistance to oxidation and hot corrosion” Advanced Engineering Materials, 6[5], 337-40 (2004).

H. Jin, L. Zhang, Z. Zheng, X. Kong, L. An and D. Shen. “Exciton tunneling in ZnCdSe quantum well/CdSe quantum dots” Acta Physica Sinica, 53 (9), 3211-3214 (2004).

R. Raj, A. Saha, L. An, D.P.H. Hasselman and F. Ernst. “Ion exchange at a metal-ceramic interface” Acta Materialia, 50, 1165-1176(2002).

Y. Liu, L. Liew, R. Lou, L. An, V.M. Bright, M.L. Dunn, J.W. Daily and R. Raj. “Application of microforging in SiCN MEMS structure fabrication” Sensors and Actuators: A. Physical, 95 (2-3): 143-151 (2002).

L. Liew, Y. Liu, R. Luo, T. Cross, L, An, V.M. Bright, M.L. Dunn, J.W. Daily, R. Raj. “Fabrication of SiCN MEMS by photopolymerization of pre-ceramic polymer” Sensors and Actuators: A. Physical, 95 (2-3): 120-134 (2002).

P.A. Ramakrishnan, Y.T. Wang, D. Balzar, L. An, C. Haluschka, R. Riedel and A. Herman. “Silicoboron-carbonitride ceramics: A class of high-temperature, dopable electronic materials” Applied Physics Letters, 78[20], 3076-78 (2001).

A.M. Hermann, Y.T. Wang, P.A. Ramakrishnan, D. Balzar, L. An, C. Haluschka and R. Riedel. “Structure and electronic transport properties of Si-(B)-C-N ceramics” Journal of the American Ceramic Society, 84(10), 2260-2264 (2001).

R. Raj, L. An, S. Shah, R. Riedel, C. Fasel and H.-J. Kleebe. “Oxidation kinetics of an amorphous silicon carbonitride ceramics” Journal of the American Ceramic Society, 84 (8), 1803-1810 (2001).

L. Liew, W. Zhang, L. An, S. Shah, R. Lou, Y. Liu, T. Cross, K. Anseth, V. Bright and R. Raj. “Ceramic MEMS – new materials, innovative processing and futuristic applications” American Ceramic Society Bulletin, 80(5), 25-30 (2001).

L. Liew, W. Zhang, V.M. Bright, L. An, M.L. Dunn and R. Raj. “Fabrication of SiCN ceramic MEMS using injectable polymer-precursor technique” Sensors and Actuators: A. Physical, 89[1-2], 64-70 (2001).

Z. Peng, W. Si, S. Lin, H. Miao and L. An. “Advances of ultrahigh temperature ceramics derived from organo-silicon polymers” Journal of Inorganic Materials, 16(5): 779-790 (2001).

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