A5028492563- 3D IC and TSV technologies
- Electronic Packaging and Soldering Technologies
- Micro and Nano Robotics
- Photonic and Optical Devices
- Advanced Sensor and Energy Harvesting Materials
- Copper Interconnects and Reliability
- Microfluidic and Bio-sensing Technologies
- Innovative Energy Harvesting Technologies
- Additive Manufacturing and 3D Printing Technologies
- Molecular Communication and Nanonetworks
- Analytical Chemistry and Sensors
- Carbon Nanotubes in Composites
- Graphene research and applications
- Optical Coatings and Gratings
- Laser-Plasma Interactions and Diagnostics
- Advanced Fiber Optic Sensors
- Mechanical and Optical Resonators
- Energy Harvesting in Wireless Networks
- Advanced MEMS and NEMS Technologies
- Conducting polymers and applications
- Electrochemical Analysis and Applications
- Semiconductor materials and devices
- Corrosion Behavior and Inhibition
- Laser-induced spectroscopy and plasma
- Thin-Film Transistor Technologies
Nanyang Technological University
2015-2023
Institute of Microelectronics
2022
Agency for Science, Technology and Research
2022
National University of Defense Technology
2020
Singapore Polytechnic
2016
Nanjing University
2014
One of the most exciting breakthroughs in physics is concept topology that was recently introduced to photonics, achieving robust functionalities, as manifested demonstrated topological lasers. However, so far almost all attention focused on lasing from edge states. Bulk bands reflect bulk-edge correspondence have been largely missed. Here, we demonstrate an electrically pumped bulk quantum cascade laser (QCL) operating terahertz (THz) frequency range. In addition band-inversion induced...
This paper presents a sandwich-structured MEMS electret-based vibrational energy harvester (e-VEH) that has two opposite-charged electrets integrated into single electrostatic device. Compared to the conventional two-plate configuration where maximum charge can only be induced when movable mass reaches its lowest position, proposed is capable of creating induction at both highest and extremes, leading an enhanced output performance. As proof concept, out-of-plane e-VEH device with overall...
This work presents a novel bird-shaped broadband piezoelectric energy harvester based on two-DOF crossed beam for low-frequency environmental vibrations. The features cantilever mounted double-hinged beam, whose rotating motions effectively diminish its natural frequencies. Numerical simulation the finite element method is conducted to analyze modal shapes and harmonic response of proposed harvester. Prototypes are fabricated experiments carried out by testing system, results indicate good...
Abstract Biofilms are sessile microbial communities living at interfaces, in which the extracellular matrix is responsible for mechanical stability and adhesion to surfaces. Transition from planktonic attached cells a key step biofilm formation process. Monitoring of this transition needed prevent contamination biomedical devices mitigate microbially influenced corrosion. Under anoxic local conditions presence an exogenous redox mediator, biofilms can divert part electron flow associated...
Herein, we develop and present a novel CMOS-compatible non-lithography technique to fabricate wafer-scale (6 inches), random textured b-Si with morphology engineering.
Mixed pitch gratings are developed for the optical addressing of trapped 88Sr+ ion by means simulation and experimental measurement approaches. Meanwhile, Python-based data analysis techniques were to analyze simulated measured beam profiles. A fixed grating with a 1.2 µm was used as reference, mixed pitches 1.1/1.2 various ratios investigated. The codes demonstrates highly automated capability in processing both profile compute key parameters, including waist Gaussian fitting. delivers...
Extracellular electron transfer (EET) from microorganisms to insoluble metals and electrodes is relevant energy recovery wastewater, green production of high-added value chemicals, biosensors for food, environmental, clinical applications. Microstructured electrode surfaces increase EET rate in bioelectrochemical systems, thus enabling higher sensibility power output as well the detection bacteria biofilms sensors. However, many aspects process, particularly early biofilm stages, are still...
Multiple lasers interacting with a deuterated (D) pitcher-catcher target and neutron generation are investigated using two-dimensional hybrid particle-in-cell Monte Carlo simulations. It is found that when multiple laser pulses focused on the front surface of pitcher layer, D+ ion acceleration by normal sheath (TNSA) enhanced interfering overlapped light fields resulting periodic target-surface structure. With three each 4.5 × 1019 W cm−2 intensity, 33 fs duration ∼160 mJ energy, focusing at...
This paper presents the development of a compact, three-electrode electrochemical device functionalized by biocompatible layer hyaluronic acid methacrylate (HAMA) hydrogel for adsorptive removal detrimental lead (Pb(II)) ions in aqueous solutions. An adsorption mechanism pertaining to observed analytical performance is proposed and further experimentally corroborated. It demonstrated that both molecular interactions originating from HAMA accumulation electrode beneath contribute capability...
Metal-metal bonding is a promising technique in semiconductor processing. In this work, we report Ar/N 2 plasma induced metastable Cu x N y for Cu-Cu die-die direct performed at room temperature ambient environment. Surface characterizations (water contact angle, surface roughness, and XPS) are on the both before after exposure. The results reveal that induces layer of , activated remains an “activated” state, as shown by low up to 6 hours compared non-activated Cu. Subsequently, dies...
Carbon nanotubes (CNTs) have, over the years, been used in research as a promising material electronics thermal interface and interconnects amongst other applications. However, there exist several issues preventing widespread integration of CNTs onto device applications, e.g., high growth temperature interfacial resistance. To overcome these issues, complementary metal oxide semiconductor (CMOS)-compatible CNT array transfer method that electrically connects arrays to target substrates was...
It has been widely reported that carbon nanotubes (CNTs) exhibit superior field emission (FE) properties due to their high aspect ratios and unique structural properties. Among the various types of CNTs, random growth CNTs promising FE reduced inter-tube screening effect. However, growing on individual catalyst islands often results in spread out CNT bundles, which reduces overall enhancement. In this study, significant improvement bundles is demonstrated by confining them microfabricated...
Nanojets with one off-center platinum nozzle nanoengine can propel forward circularly, while the nanojets two identically and symmetrically distributed nanoengines are capable of moving in a linear way.
Diffraction gratings are among the most commonly used optical elements in applications ranging from spectroscopy and metrology to lasers. Numerous methods have been adopted for fabrication of gratings, including microelectromechanical system (MEMS) which is by now mature presents opportunities tunable through inclusion an actuation mechanism. We designed, modeled, fabricated tested a silicon based pitch diffraction grating (PTG) with relatively large resolving power that could be deployed...
Oscillate boiling offers excellent heat transfer at temperatures above the Leidenfrost temperature. Here we realize an electrical microheater with integrated thermal probe and resolve cycle during high-frequency bubble oscillations. Thermal rates of $10^8\,$K/s were found indicating its applicability for compact rapid from micro devices.
In this article, we report in-depth parametric study of argon/nitrogen plasma-activated copper surfaces for copper-copper die-to-die direct bonding carried out at room temperature in cleanroom ambient condition. Surface analyses (e.g. water contact angle and X-ray photoelectron spectroscopy) are performed on the control, argon or nitrogen surfaces. The results reveal that a thin layer nitride is formed surface with plasma treatment, which potentially effective passivation to control...
Microrockets with eccentric nanoengines are able to realize the steerable propulsion in either a clockwise or counter-clockwise direction.
In this study, two-step argon/nitrogen plasma-activated aluminum surface for aluminum-aluminum direct bonding is reported. Surfaces from the as-deposited and are characterized hydrophilicity chemical states. The results demonstrate that has smaller water contact angle at 8° (i.e. more hydrophilic) a thin layer of nitride. Moreover, bonded dies, annealed 300°C under 2000 mBar, have an impressive mechanical strength ~32 MPa with superior quality. This process fast (10 s), requires low force...
Carbon nanotubes (CNTs) exhibit unstable field emission (FE) behavior with low reliability due to uneven heights of as-grown CNTs. It has been reported that a mechanically polished SiO2-wrapped CNT emitter gives consistent FE performance its uniform heights. However, there are still lack studies on the comparison between properties freestanding and In this study, we have performed comparative study emitters. From measurements, requires lower applied voltage 5.5 V μm-1 achieve current density...
Abstract This paper presents the development of a thin‐film quasi‐reference electrode (tQRE), which was fabricated by sputtering silver (Ag) on conducting gold layer. The Ag layer subsequently covered chloride (AgCl) with aid e‐beam evaporation. functionality tQREs as reliable reference electrodes confirmed observing potential response in solutions various ion concentrations. influence solution pH change evaluated. In controlled ionic strength, were able to provide stable and consistent...