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Du Hejun


Du Hejun
Associate Professor
Tel: 6790 4783
Email: mhdu@ntu.edu.sg
Office: N3.2-02-09 
   
Education
  • DIC PhD University of London, Imperial Coll. 1991
  • ME Nanjing Aeronautical Institute 1986
  • BE(Hons) Nanjing Aeronautical Institute 1983

Biography
Dr Du obtained his BEng and MEng from Nanjing University of Aeronautics and Astronautics, China in 1983 and 1986, respectively. He obtained PhD from Imperial College of Science, Technology and Medicine, UK in 1991 and joined Nanyang Technological University (NTU), Singapore after that. He is currently an associate professor in the School of Mechanical and Aerospace Engineering, NTU. Dr Du was awarded the prestigious Teach of the Year Award by the university in 1999. He served as Head of Engineering Mechanics Division in the school from 2008 to 2011. His research interests are mainly involved in three areas: 1) MEMS, thin films and microfluidics; 2) smart materials and their applications; and 3) numerical and computational methods for engineering applications. He has obtained over 15 research grants from various research funding agencies in the past, totaling more than S$10 million as PI or Co-PI. He has published over 200 international journal papers, which are highly cited.

Research
  • Interest:
    MEMS, thin films, microfluidics, smart materials, numerical and computational methods
  • Projects:
    Development of Micro-sensor and Micro-actuator For Smart Sliders: Head-disk Contact Sensing and Nano Actuating to Achieve 10 Tb/in2
    Head-disk contact becomes inevitable when flying height of the magnetic slider in the hard disk drive approaches sub-5 nm for areal densities beyond 500 Gb/in2. Head-disk contact can cause damage to the head-disk interface (HDI) and read/write failure. This project aims to develop a smart slider with built-in ZnO piezoelectric nano-film sensor for head-disk contact detection and an active ZnO-based micro-actuator to prevent contacts and reduce the possibility of data loss.
    [Micro-Systems Lab, Micro-Systems & Optics]
    Oven Controlled MEMS Oscillator (OCMO) based on silicon micromachining technology
    Frequency references are the beating heart of all modern electronics and provide the pulse for digital devices. Presently, quartz crystal references are used in majority of timing sources to provide stable signal to ensure high performance and reliability. However, quartz crystals are not silicon-compatible and cannot benefit from the exponential advances in silicon-based electronic technology. Microelectromechanical Systems (MEMS) resonators with which the oscillators are built are a fraction of a millimeter across and vibrate at Megahertz frequencies. They are now displacing quartz resonators in timing applications. Stability is the primary performance characteristic of a MEMS oscillator. The aim of this project is to develop an oven-controlled MEMS oscillator (OCMO) for high precision timing applications.
    [Micro-Systems Lab, Micro-Systems & Optics]
    Development of an ultra-high g deceleration measurement system
    The ultra-high g deceleration measurement plays a very important role in the astronautical and the military industry. Many efforts have been made in developing such measurement systems worldwide. In this study, an ultra-high g deceleration measurement system will be developed and investigated thoroughly. The deceleration measurement system is mainly comprised of an accelerometer, a data recording and processing device and the shock-absorbing protective system. In the design of the measurement system, numerical simulation will be carried out to simulate the penetrating process and ensure the developed system be able to survive the high g shock. The simulation results will also be compared with the actual experiment measurement of the deceleration process. The ultimate objective is to develop an ultra-high g deceleration measurement device for testing in-situ actual projectile and to obtain the relevant information during the penetration process.
    [Mechanics of Materials Lab, Mechanics]
    Development of miniaturized 3D-structured lead-free piezoelectric transducers via 3D additive manufacturing technology
    This proposal is aimed to develop a 3D additive manufacturing process for processing lead-free piezoelectric materials (such as ZnO, AlN, BaTiO3) and producing 3D-structured miniaturized piezoelectric transducers.
    [Singapore Centre for 3D Printing, Manufacturing]

Research Staff and Students under supervision

Research Staff
Name Title Email
Wei Yuefan Research Fellow WEIYF@ntu.edu.sg
Pang Xin Project Officer PANGXIN@ntu.edu.sg

PhD Students
Name Project
Tran Van Thai Development of Miniaturized 3D-structured Lead-free Piezoelectric Transducers via 3D Additive Manufacturing Technology
Pang Xin Development of An Ultra High G Deceleration Measurement System

Master Student
Name Project
Vinayak Narasimhan High-G Inertial MEMS Accelerometers

Selected Publications
  • Liu XB*, Du HJ, Sun XW, Zhan ZY, Sun G, Li F, Zheng L, and Zhang S, Improved Photovoltaic Performance of Multiple Carbon-Doped ZnO Nanostructures Under UV and Visible Light Irradiation, Journal of Nanoscience and Nanotechnology, 14, 7066–7071, 2014.
  • Yuan YH*; Du HJ; Chow KS*; Zhang MS; Yu SK; Liu B, Performance analysis of an integrated piezoelectric ZnO sensor for detection of head-disk contact, MICROSYSTEM TECHNOLOGIES, 19(9-10),1449-1455, SEP 2013
  • Yuan Y*; Du H; Chow KS; Zhang M; Yu S; Liu B, Design and Analysis of a Slider-Level Piezoelectric Sensor Array for Head-Disk Contact Detection, IEEE TRANSACTIONS ON MAGNETICS, 49(6), 2574-2577, JUN 2013
  • Yuan YH*; Du HJ; Wang PH; Chow KS; Zhang MS; Yu SK; Liu B, A ZnO microcantilever for high-frequency nanopositioning: ModeLing fabrication and characterization, SENSORS AND ACTUATORS A-PHYSICAL, 194, 75-83, MAY 1 2013,
  • Wei YF; Kong JH; Yang LP; Ke L; Tan HR; Liu H; Huang YZ; Sun XW; Lu XH; Du HJ, Polydopamine-assisted decoration of ZnO nanorods with Ag nanoparticles: an improved photoelectrochemical anode, JOURNAL OF MATERIALS CHEMISTRY A, 1(16), 5045-5052, 2013, Q1
  • Wang PH*; Du HJ; Shen SN; Zhang MS; Liu B, Deposition, characterization and optimization of zinc oxide thin film for piezoelectric cantilevers, APPLIED SURFACE SCIENCE, 258(24), 9510-9517, OCT 1 2012
  • Wei YF*; Ke L; Kong JH; Liu H; Jiao ZH; Lu XH; Du HJ; Sun XW, Enhanced photoelectrochemical water-splitting effect with a bent ZnO nanorod photoanode decorated with Ag nanoparticles, NANOTECHNOLOGY, 23(23), Article Number: 235401, JUN 2012.
  • Chen DF*; Li WH*; Du HJ; Li M, Continuous Sorting of Microparticles Using Dielectrophoresis, JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 12(4), 3035-3039, APR 2012.
  • Wang PH*; Du HJ; Shen SN; Zhang MS; Liu B, Preparation and characterization of ZnO microcantilever for nanoactuation, NANOSCALE RESEARCH LETTERS, 7(1-5), Article Number: 176, MAR 8 2012
  • Liu XB*; Du HJ; Sun XW; Liu B; Zhao DW; Sun HD, Visible-light photoresponse in a hollow microtube-nanowire structure made of carbon-doped ZnO, CRYSTENGCOMM, 14(8), 2886-2890, 2012
  • Chow KS*; Du HJ, Dielectrophoretic characterization and trapping of different waterborne pathogen in continuous flow manner, SENSORS AND ACTUATORS A-PHYSICAL, 170, 24-31, NOV 2011
  • Chen DF; Du HJ, A microfluidic device for rapid concentration of particles in continuous flow by DC dielectrophoresis, MICROFLUIDICS AND NANOFLUIDICS, 9(2-3), 281-291, AUG 2010

Teaching
  • Theroy of Mechanism
  • Mechanical And Structural Engineering II
  • Machine Vibration Analysis And Fault Recognition
  • Machine Design
  • Mechanics of Deformable Solids
  • Dynamics