Simiao Niu

Simiao Niu

Graduate Student

Office: 276II IPST Building
Telephone: N/A
Fax: 404-894-9140
Mailing Address: 277H IPST Building
Georgia Institute of Technology
500 10th Street NW
Atlanta, GA 30318
Biosketch | Research Area | Publications | Highlights | Honors


  • Ph.D. Candidate, Materials Science & Engineering , Georgia Institute of Technology, Atlanta, Georgia. In progress. GPA: 4.0/4.0. Expected Graduation: 05/2016.
  • Master of Science, Electrical & Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia. 08/2011- 08/2015. GPA: 4.0/4.0. Focus: Microelectronic devices, circuits and systems.
  • Bachelor of Engineering, Electrical Engineering , Tsinghua University, Beijing, China. 08/2007 – 07/2011. Graduated with the highest honor.

Research Area

  • Integrated nanogenerator-based self-powered systems, including design of energy harvesting devices, energy storage units, and interface circuits for collaborative work of the whole system.
  • Analytical theory and modeling for energy harvesting and piezoelectric nanowire based devices, including simulation for mechanics, semiconductor, electrostatics and optics.
  • Design, fabrication and test of nano-devices for mechanical energy harvesting and sensor applications.
  • Design, fabrication and test of piezoelectric nanowire based novel mechanical, chemical and optical sensors and devices.
  • Synthesis of functional nanomaterials


First author/co-first author publications:

Highlights: 2 in Nature Communications, 7 in Advanced Materials, and 2 in Energy & Environmental Science

1. S. Niu*; X. F. Wang*; F. Yi; Y. S. Zhou; Z. L. Wang. “A Universal Self-charging System Driven by Random Biomechanical Energy for Sustainable Operation of Mobile Electronics”. Nature Communications 2015, DOI: 10.1038/ncomms9975..

2. Y. Zi*; S. Niu*; J. Wang; Z. Wen; W. Tang; Z. L. Wang. “Standards and Figure-of-merits for Quantifying the Performance of Triboelectric Nanogenerators”. Nature Communications 2015, 6, 8376.

3. S. Niu*; Y. Liu*; S. Wang; L. Lin; Y. S. Zhou; Y. Hu; Z. L. Wang. “Theory of Sliding-Mode Triboelectric Nanogenerators”. Advanced Materials 2013, 25, 6184-6193.

4. S. Niu*; S. Wang*; L. Lin; Y. Liu; Y. S. Zhou; Y. Hu; Z. L. Wang, “Theoretical Study of Contact-Mode Triboelectric Nanogenerators as an Effective Power Source”. Energy & Environmental Science 2013, 6, 3576- 3583.

5. S. Niu; Y. Hu; X. Wen; Y. S. Zhou; F. Zhang; L. Lin; S. Wang; Z. L. Wang, “Enhanced Performance of Flexible ZnO Nanowire Based Room-Temperature Oxygen Sensors by Piezotronic Effect”. Advanced Materials 2013, 25, 3701– 3706.

6. S. Niu*; S. Wang*; Y. Liu*; Y. S. Zhou; L. Lin; Y. Hu; K. C. Pradel; Z. L. Wang. “A Theoretical Study of Grating Structured Triboelectric Nanogenerators”. Energy & Environmental Science 2014, 7, 2339-2349.

7. S. Niu*; Y. Liu*; S. Wang; L. Lin; Y. S. Zhou; Y. Hu; Z. L. Wang. “Theoretical Investigation and Structural Optimization of Single-Electrode Triboelectric Nanogenerators”. Advanced Functional Materials 2014, 24, 3332-3340.

8. S. Niu; Y. S. Zhou; S. Wang; Y. Liu; L. Lin; Y. Bando; Z. L. Wang. “Simulation method for Optimizing the Performance of an Integrated Triboelectric Nanogenerator Energy Harvesting System”. Nano Energy 2014, 8, 150-156.

9. S. Niu; Y. Liu; Y. S. Zhou; S. Wang; L. Lin; Z. L. Wang. “Optimization of Triboelectric Nanogenerator Charging Systems for Efficient Energy Harvesting and Storage”. IEEE Transactions on Electron Devices 2015, 62, 641-647.

10. S. Niu*; Y. Liu*; X. Chen*; S. Wang; Y. S. Zhou; L. Lin; Y. Xie; Z. L. Wang. “Theory of freestanding triboelectric-layer-based nanogenerators”. Nano Energy 2015, 12, 760-774.

11. S. Niu; Z. L. Wang. “Theoretical systems of triboelectric nanogenerators”. (Invited Review) Nano Energy 2015, 14, 161-192.

12. L. Dong*; S. Niu*; C. Pan; R. Yu; Y. Zhang; Z. L. Wang, “Piezo-phototronic Effect of CdSe Nanowires”. Advanced Materials 2012, 24, 5470-5475.

13. Y. Liu*; S. Niu*; Q. Yang; B. D. B. Klein; Y.S. Zhou; Z. L. Wang, “Theoretical Study of Piezo-phototronic Nano-LEDs”. Advanced Materials 2014, 26, 7209-7216.

14. X. Wang*; S. Niu*; Y. Yin; F. Yi; Z. You; Z. L. Wang. “Triboelectric Nanogenerator based on Fully-enclosed Rolling Spherical Structure for Harvesting Low-frequency Water Wave Energy”. Advanced Energy Materials 2015, DOI: 10.1002/aenm.201501467.

15. Y. Liu*; S. Niu*; Z. L. Wang, “Theory of Tribotronics”. Advanced Electronic Materials 2015, 1, 1500124.

16. S. Wang*; Y. Xie*; S. Niu*; L. Lin; Z. L. Wang. “Freestanding-Triboelectric-Layer Based Nanogenerators for Harvesting Energy from a Moving Object or Human Motion in Contact and Non-Contact Modes”. Advanced Materials 2014, 26, 2818-2824.

17. Y. S. Zhou*; G. Zhu*; S. Niu*; Y. Liu; P. Bai; Q. Jing; Z. L. Wang. “Nanometer Resolution Self-Powered Static and Dynamic Motion Sensor Based on Micro-Grated Triboelectrification”. Advanced Materials 2014, 26, 1719-1724.

18. Y. Xie*; S. Wang*; S. Niu*; L. Lin; Q. Jing; J. Yang; Z. Wu; Z. L. Wang. “Grating-Structured Freestanding Triboelectric-layer Nanogenerator for Harvesting Mechanical Energy at 85% Total Conversion Efficiency”. Advanced Materials 2014, 26, 6599-6607.

19. F. Yi*; L. Lin*; S. Niu*; P. K. Yang; Z. Wang; J. Chen; Y. S. Zhou; Y. Zi; J. Wang; Q. Liao; Y. Zhang; Z. L. Wang. “Stretchable-Rubber-Based Triboelectric Nanogenerator and Its Application as Self-Powered Body Motion Sensors”. Advanced Functional Materials 2015, 25, 3688-3696.

20. F. Yi*; L. Lin*; S. Niu*; J. Yang; W. Wu; S. Wang; Q. Liao; Y. Zhang; Z. L. Wang. “Self-Powered Trajectory, Velocity, and Acceleration Tracking of a Moving Object/Body using a Triboelectric Sensor”. Advanced Functional Materials 2014, 24, 7488-7494.

21. L. Lin*; S. Wang*; S. Niu*; C. Liu; Y. Xie; Z. L. Wang. “Noncontact Free-Rotating Disk Triboelectric Nanogenerator as a Sustainable Energy Harvester and Self-Powered Mechanical Sensor”. ACS Applied Materials & Interfaces 2014, 6, 3031-3038.

Other co-author publications: (1 in Nature and 1 in Nature Photonics)
W. Wu; L. Wang; Y. Li; F. Zhang; L. Lin; S. Niu; D. Chenet; X. Zhang; Y. Hao; T. F. Heinz; J. Hone; Z. L. Wang, “Piezoelectricity of single-atomic-layer MoS2 for energy conversion and piezotronics”. Nature 2014, 514, 470-474.

C. Pan; L. Dong; G. Zhu; S. Niu; R. Yu; Q. Yang; Y. Liu; Z. L. Wang, “High-resolution electroluminescent imaging of pressure distribution using a piezoelectric nanowire LED array”. Nature Photonics 2013, 7, 752-758.

J. Chen; J. Yang; Z. Li; X. Fan; Y. Zi; Q. Jing; H. Guo; Z. Wen; K. C. Pradel; S. Niu; Z. L. Wang. “Networks of Triboelectric Nanogenerators for Harvesting Water Wave Energy: A Potential Approach toward Blue Energy”. ACS Nano 2015, 9, 3324–3331.

R. Yu; S. Niu; C. Pan; Z. L. Wang. “Piezotronic effect enhanced performance of Schottky-contacted optical, gas, chemical and biological nanosensors”. Nano Energy 2015, 14, 312-339.

L. Lin; Y. Xie; S. Niu; S. Wang; P. K. Yang; Z. L. Wang. “Robust Triboelectric Nanogenerator Based on Rolling Electrification and Electrostatic Induction at an Instantaneous Energy Conversion Efficiency of∼ 55%”. ACS Nano 2015, 9, 922-930.

Y. Liu; Y. Zhang; Q. Yang; S. Niu; Z. L. Wang. “Fundamental Theories of piezotronics and piezo-phototronics”.
Nano Energy 2015, 14, 257-275.

C. K. Jeong; K. M. Baek; S. Niu; T. W. Nam; Y. H. Hur; D. Y. Park; G. T. Hwang; M. H. Byun; Z. L. Wang; Y.S. Jung; K. J. Lee. “Topographically-Designed Triboelectric Nanogenerator via Block Copolymer Self-Assembly”. Nano Letters 2014, 14, 7031-7038.

S. Wang; S. Niu; J. Yang; L. Lin; Z. L. Wang. “Quantitative Measurements of Vibration Amplitude Using a Contact-Mode Freestanding Triboelectric Nanogenerator”. ACS Nano 2014, 8, 12004-12013.

Y. Ding; Y. Liu; S. Niu; W. Wu; Z. L. Wang. “Pyroelectric-field driven defects diffusion along c-axis in ZnO nanobelts under high-energy electron beam irradiation”. Journal of Applied Physics 2014, 116, 154304.

X. Li; Z. H. Lin; G. Cheng; X. Wen; Y. Liu; S. Niu; Z. L. Wang, “3D Fiber-Based Hybrid Nanogenerator for Energy Harvesting and as a Self-Powered Pressure Sensor”. ACS Nano 2014, 8, 10674-10681.

S. Wang; Y. Xie; S. Niu; L. Lin; C. Liu; Y. S. Zhou; Z. L. Wang, “Maximum Surface Charge Density for Triboelectric Nanogenerators Achieved by Ionized-Air Injection: Methodology and Theoretical Understanding” . Advanced Materials 2014, 26, 6720-6728.

Y. Hu; J. Yang; S. Niu; W. Wu; Z. L. Wang, “Hybridizing Triboelectrification and Electromagnetic-Induction Effects for High Efficient Mechanical Energy Harvesting”. ACS Nano 2014, 8, 7442-7450.

Y. Xie; S. Wang; S. Niu; L. Lin; Q. Jing; Y. Su; Z. Wu; Z. L. Wang, “Multi-layered Disk Triboelectric Nanogenerator for Harvesting Hydropower”. Nano Energy 2014, 6, 129-136.

Y. S. Zhou; S. Wang; Y. Yang; G. Zhu; S. Niu; Z. H. Lin; Y. Liu; Z. L. Wang, “Manipulating nano-scale contact electrification by applied electric field”. Nano Letters 2014, 14, 1567-1572.

X. Wen; W. Yang; Y. Ding; S. Niu; Z. L. Wang, “Piezoresistive effect in MoO3 nanobelts and its application in strain-enhanced oxygen sensors”. Nano Research 2014, 7, 180-189.

S. Wang; Z. H. Lin; S. Niu; L. Lin; Y. Xie; K. C. Pradel; Z. L. Wang, “Motion Charged Battery as Sustainable Flexible-Power-Unit”. ACS Nano 2013, 7, 11263-11271.

Y. Hu; J. Yang; Q. Jing; S. Niu; W. Wu; Z. L. Wang, “Triboelectric Nanogenerator Built on Suspended 3D Spiral Structure as Vibration and Positioning Sensor and Wave Energy Harvester”. ACS Nano 2013, 7, 10424-10432.

Y. Hu; B. Klein; Y. Su; S. Niu; Y. Liu; Z. L. Wang, “Temperature dependence of piezotronic effect in ZnO nanowires”. Nano Letters 2013, 13, 5026-5032.

L. Lin; Y. Xie; S. Wang; W. Wu; S. Niu; X. Wen; Z. L. Wang, “Triboelectric Active Sensor Array for Self-Powered Static and Dynamic Pressure Detection and Tactile Imaging”. ACS Nano 2013, 7, 8266-8274.

Y. Xie; S. Wang; L. Lin; Q. Jing; Z. H. Lin; S. Niu; Z. Wu; Z. L. Wang, “Rotary Triboelectric Nanogenerator Based on a Hybridized Mechanism for Harvesting Wind Energy”. ACS Nano 2013, 7, 7119-7125.

L. Lin; S. Wang; Y. Xie; Q. Jing; S. Niu; Y. Hu; Z. L. Wang, “Segmentally Structured Disk Triboelectric Nanogenerator for Harvesting Rotational Mechanical Energy”. Nano Letters 2013, 13, 2916-2923.

F. Zhang; S. Niu; W. Guo; G. Zhu; Y. Liu; X. Zhang; Z. L. Wang, “Piezo-phototronic Effect Enhanced Visible/UV Photodetector of a Carbon-Fiber/ZnO-CdS Double-Shell Microwire”. ACS Nano 2013, 7, 4537-4544.

S. Wang; L. Lin; Y. Xie; Q. Jing; S. Niu; Z. L. Wang, “Sliding-Triboelectric Nanogenerators Based on In-Plane Charge-Separation Mechanism”. Nano Letters 2013, 13, 2226-2233.

C. Pan; R. Yu; S. Niu; G. Zhu; Z. L. Wang, “Piezotronic Effect on the Sensitivity and Signal Level of Schottky Contacted Proactive Micro/Nanowire Nanosensors”. ACS Nano 2013, 7, 1803-1810.

C. Pan; S. Niu; Y. Ding; L. Dong; R. Yu; Y. Liu; G. Zhu; Z. L. Wang, “Enhanced Cu2S/CdS Coaxial Nanowire Solar Cells by Piezo-phototronic Effect”. Nano Letters 2012, 12, 3302– 3307.

R. Yu; L. Dong; C. Pan; S. Niu; H. Liu; W. Liu; S. Chua; D. Chi; Z. L. Wang, “Piezotronic effect on the transport properties of GaN nanobelts for active flexible electronics”. Advanced Materials 2012, 24, 3532-3537.

Professional Skills

  • Expert in finite-element simulation, numerical calculation and programming skills.
  • Expert in digital/analog circuit design, simulation, and test.
  • Experienced in designing, fabricating, and testing electronic devices based on semiconducting nanomaterials, such as nanogenerators, solar cells, and pressure/strain sensors.
  • Expert in synthesizing semiconducting nanomaterials via PVD and hydrothermal method.
  • Strong background in materials characterization via SEM, EDS, XRD, XPS, AFM, and Raman Spectrometer.
  • Extensive experience in cleanroom mirofabrication; skilled in equipment that include mask aligner, EBL, evaporator, sputter, FIB, RIE, ICP, PECVD.
  • Familiar with software applications that include COMSOL Multiphysics, MATLAB, Cadence, NI LabVIEW, SIESTA, SUPREM, AutoCAD, and 3ds Max.

Honors & Awards

  • 2015 Materials Research Society (MRS) Graduate Student Silver Award
  • 2015 Georgia Tech CRIDC 2015 Best Poster Grand Prize (1 out of 300)
  • 2014 Georgia Tech MSE 2014 Poster Competition Outstanding Poster Award
  • 2014 Georgia Tech GTRIC 2014 Best Poster Award (20 out of 400)
  • 2011 Graduated with the highest honor, Tsinghua University
  • 2011 Beijing City Outstanding Undergraduate Award (Top 1%)
  • 2011 Tsinghua University Outstanding Undergraduate Award
  • 2011 Tsinghua University Outstanding Undergraduate Thesis Award
  • 2010 Chinese Government National Scholarship (Top 1%)
  • 2009 Toyota Scholarship
  • 2008 AEON Scholarship (Top 5%)