A5101515745- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Radiation Detection and Scintillator Technologies
- Force Microscopy Techniques and Applications
- Acoustic Wave Resonator Technologies
- Carbon Nanotubes in Composites
- Wireless Power Transfer Systems
- Medical Imaging Techniques and Applications
- Luminescence Properties of Advanced Materials
- Energy Harvesting in Wireless Networks
- Analytical Chemistry and Sensors
- Concrete and Cement Materials Research
- Advanced Semiconductor Detectors and Materials
- Particle Detector Development and Performance
- Advanced Chemical Sensor Technologies
- Photonic Crystals and Applications
- Energy Efficient Wireless Sensor Networks
- Gold and Silver Nanoparticles Synthesis and Applications
- Nuclear materials and radiation effects
- Nuclear Physics and Applications
- Conducting polymers and applications
- Geophysics and Sensor Technology
- Luminescence and Fluorescent Materials
- Satellite Communication Systems
- Photoacoustic and Ultrasonic Imaging
University of Tennessee at Knoxville
2024
Hanoi Pedagogical University 2
2024
Hanoi University of Science and Technology
2013-2024
Technical University of Denmark
2018-2023
Ørsted (Denmark)
2021-2023
Sandia National Laboratories California
2022
Vietnam National University Ho Chi Minh City
2020
Ho Chi Minh City University of Technology
2020
Villum Fonden
2019
The Velux Foundations
2018-2019
For disaster communications, it is very challenging for the contemporary wireless technology and infrastructure to meet demands connectivity. Modern networks should be developed satisfy increasing demand of quality-of-service (QoS) in mission-critical communications disas
This paper reports on the design and fabrication of a z-axis tuning fork gyroscope which has freestanding architecture. In order to improve performance by eliminating influence squeeze-film air damping, driving sensing parts were designed oscillate in-plane. Furthermore, removing substrate underneath device, slide-film damping in gap between proof masses was eliminated. The proposed architecture analyzed finite element method using ANSYS software. simulated frequencies modes 9.788 9.761 kHz,...
Phase-pure transparent LSO ceramic was obtained, with its scintillation properties rivaling those of single crystalline LSO. The prepared by a nano-technology approach. densities the increased increasing sintering temperature. Further SEM examination confirmed decrease porosity during densification ceramic. Pores were segregated at grain boundaries after sintering. Hot isostatic pressing (HIPing) employed to further densify and eliminate Transparent polycrystalline ceramics obtained final...
Abstract Polymer‐based surface‐enhanced Raman spectroscopy (SERS) substrates offer distinctive advantages such as low‐cost and high optical transparency which allows direct detection of trace chemicals on target surfaces easy microfluidic integration. However, incident‐laser‐induced localized surface plasmon resonances can generate heat that deform the polymer significantly reduce intensities recorded SERS signals. Herein, a novel wafer‐scale polymer‐based transparent nanocoral (WTNC)...
Abstract Thermal analysis is essential for the characterization of polymers and drugs. However, currently established methods require a large amount sample. Here, we present pyrolytic carbon resonators as promising tools micromechanical thermal (MTA) nanograms polymers. Doubly clamped pre-stressed beams with resonance frequency 233 ± 4 kHz quality factor (Q factor) 800 200 were fabricated. Optimization electrical conductivity allowed us to explore resistive heating integrated temperature...
In this work, we present the fabrication and characterization of a sensor combining electrochemistry with mass sensing. The was realized using pyrolytic carbon, which is highly suitable as electrode material. A carbon resonator embedded working in an electrochemical cell three-electrode configuration. Initial current-voltage (IV) measurements cyclic voltammetry (CV) demonstrated that resonators were electrodes. resonance frequency measured to be 143.3 ± 3.4 kHz. conductive properties used...
Abstract A highly sensitive amperometric Prussian blue‐based hydrogen peroxide sensor was developed using 3D pyrolytic carbon microelectrodes. printed multielectrode electrochemical cell enabled simultaneous reproducible blue modification on multiple electrodes. The effect of oxygen plasma pre‐treatment and deposition time electrodeposition studied. response 2D sensors to the addition in μM sub‐μM concentrations phosphate buffer investigated. high sensitivity comparable flow injection...
In this paper, a high-efficiency voltage doubler rectifier for radio frequency identification (RFID) applications is presented. The study focuses on new internal V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Th</sub> cancellation (IVC) technique which combination between conventional IVC circuit and proposed switches to improve power conversion efficiency (PCE) (VCE). Proposed designed using 0.13um CMOS technology passive tags of high (HF)...
In advance of biomedical devices, the demands integrated power harvesting system for rechargeable battery applications are underlying issues. This paper presents a wireless Li-Ion charger including voltage doubler (AC-DC), linear regulator (LDO) and charging control loop applying multi phases method to minimize effect. Proposed Li-ion with input is 6Vp-p at frequency 4MHz, DC output 4.1V maximum current 1.5mA designed using TSMC 130nm technology implanted devices.
Lutetium oxyorthosilicate (Lu<sub>2</sub>SiO<sub>5</sub>:Ce<sup>3+</sup>, commonly known as LSO) is a scintillator of choice for medical imaging applications such Positron Emission Tomography (PET) because its high light output, gamma ray stopping power and fast response. In the current study, phase-pure LSO ceramics were obtained with degree optical transparency excellent scintillation properties. These prepared by combining nanotechnology sinter-HIP approach. We found that densities...
Photoluminescent composites consisting of a photoluminescent material dispersed in suitable matrix have been applied many applications, such as light-emitting diodes, solar concentrators, and anti-counterfeiting inks. The traditional method for the fabrication by blending an as-synthesized is very challenging it difficult to obtain homogeneous composites. In this study, we demonstrated one-step prepare inducing formation in-situ centers stable matrix. Poly(methyl methacrylate) (PMMA) coated...
This paper reports the design and fabrication of a z-axis tuning fork gyroscope (TFG) having anti-phase controlled freestanding architectures. The is designed to suppress in-phase sensing mode by using self-rotation ring. To improve performance TFG limiting influence squeeze-film damping, driving parts were oscillate in plane. Furthermore, removing substrate underneath device, slide-film damping gap between proof masses eliminated. proposed architecture analysed finite element method ANSYS...
In this paper, we present design and analysis of a three-degree-of-free sensor, which integrates lateral axis tuning fork angular rate gyroscope with two-degree-of-free accelerometer. The sensors for integrating are designed to reduce noises improve the sensitivity by exploring mechanical couple springs. devices is carried out simulating their behavior FEM method using ANSYS software SIMULINK Matlab. frequency difference between operation modes parasitic ones in accelerometer 50% 58%,...
Transparent lutetium oxyorthosilicate (LSO) ceramic was obtained with its scintillation properties rivaling those of single crystalline LSO. The transparent LSO prepared by a nano-technology approach. Hot-isostatic-pressing (HIPing) employed to densify the and eliminate porosity after sintering. polycrystalline ceramics were final HIPing. XRD examination confirms monoclinic phase. A light output as high 30,100 ph/MeV achieved under <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper, we report on a SOI-based comb capacitive-type accelerometer that senses acceleration in two lateral directions. The structure of the was designed using proof mass connected by four folded-beam springs, which are compliant to inertial displacement causing attached At same time, springs enabled suppress cross-talk mechanical coupling from parasitic vibration modes. differential capacitor sense employed eliminate common mode effects. design gap between fingers also analyzed find...
In this study, experimental results on mesoporous zeolite preparation from a common solid waste, the rice husk ash by top-down and bottom-up approach were reported. method, consecutive treatments of acid alkaline in presence cationic surfactant (CTAB) successfully generated mesopores zeolite. sufficient added amount CTAB gel composition could form The obtained possessed mesopore with size around 3-6 nm both approaches. As result, pore volume was significantly increased more than 60% when...