A5050145307- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Gas Sensing Nanomaterials and Sensors
- GaN-based semiconductor devices and materials
- Analytical Chemistry and Sensors
- Acoustic Wave Resonator Technologies
- Advanced Chemical Sensor Technologies
- Nanowire Synthesis and Applications
- Force Microscopy Techniques and Applications
- Microfluidic and Bio-sensing Technologies
- Advanced Sensor and Energy Harvesting Materials
- Advancements in Battery Materials
- Air Quality Monitoring and Forecasting
- Sensor Technology and Measurement Systems
- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- Electrospun Nanofibers in Biomedical Applications
- Laser Material Processing Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Silicon Carbide Semiconductor Technologies
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Advanced Fluorescence Microscopy Techniques
- ZnO doping and properties
- Photonic and Optical Devices
Technische Universität Braunschweig
2014-2024
Infineon Technologies (Germany)
2023-2024
Infineon Technologies (United Kingdom)
2023
Institute of Semiconductor Physics
2021
University of Padua
2020
Fraunhofer Institute for Surface Engineering and Thin Films
2015
Asia University
2011
Asia University
2010
Gallium nitride (GaN) light-emitting-diode (LED) technology has been the revolution in modern lighting. In last decade, a huge global market of efficient, long-lasting, and ubiquitous white light sources developed around inception Nobel-prize-winning blue GaN LEDs. Today, optoelectronics is developing beyond solid-state lighting, leading to new innovative devices, e.g., for microdisplays, being core future augmented reality visualization, as well point optical excitation communications,...
The reverse transcription-quantitative polymerase chain reaction (RT-qPCR) approach has been widely used to detect the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). However, instead of using it alone, clinicians often prefer diagnose disease 2019 (COVID-19) by utilizing a combination clinical signs and symptoms, laboratory test, imaging measurement (e.g., chest computed tomography scan), multivariable prediction models, including electronic nose. Here, we report on...
The use of powdered photocatalysts in wastewater treatment presents several challenges, such as difficulties recovery, aggregation during use, and poor reusability, which limit their effectiveness large-scale environmental applications....
A film of gas sensitive ZnO nanoparticles has been coupled with a low-power micro light plate (μLP) to achieve NO2-parts-per-billion conductometric sensor operating at room temperature. In this μLP configuration, an InGaN-based LED (emitting 455 nm) is integrated few hundred nanometers distance from the material, leading photoactivation well controlled, uniform, and high irradiance conditions, very low electrical power needs. The response curves different NO2 concentrations as function...
A comprehensive review of low-cost top-down approaches to enhance the electrochemical performance silicon anodes, including future research directions.
Production of high-aspect-ratio silicon (Si) nanowire-based anode for lithium ion batteries is challenging particularly in terms controlling wire property and geometry to improve the battery performance. This report demonstrates tunable optimization inductively coupled plasma reactive etching (ICP-RIE) at cryogenic temperature fabricate vertically-aligned nanowire array anodes with high verticality, controllable morphology, good homogeneity. Three different materials [i.e., photoresist,...
This work presents the development of hierarchical niobium pentoxide (Nb2O5)-based composite nanofiber membranes for integrated adsorption and photocatalytic degradation methylene blue (MB) pollutants from aqueous solutions. The Nb2O5 nanorods were vertically grown using a hydrothermal process on base electrospun nanofibrous membrane made polyacrylonitrile/polyvinylidene fluoride/ammonium niobate (V) oxalate hydrate (Nb2O5@PAN/PVDF/ANO). They characterized field-emission scanning electron...
Authentication of meat floss origin has been highly critical for its consumers due to existing potential risks having allergic diseases or religion perspective related pork-containing foods. Herein, we developed and assessed a compact portable electronic nose (e-nose) comprising gas sensor array supervised machine learning with window time slicing method sniff classify different products. We evaluated four methods data classification (i.e., linear discriminant analysis (LDA), quadratic...
The pursuit of sculpting materials at increasingly smaller and deeper scales remains a persistent subject in the field micro- nanofabrication. Anisotropic deep-reactive ion etching silicon cryogenic temperatures (cryo-DRIE) was investigated for fabricating arrays vertically aligned Si nanowires (NWs) large range dimensions from micrometers down to 30 nm diameter, combined with commonly used wafer-scale lithography techniques based on optical, electron-beam, nanoimprint, nanosphere/colloidal...
Abstract Miniaturization of modern microelectronics to accommodate the development portable and smart devices requires independent energy storage that is compact, lightweight, reliable, integrable on-chip. Three-dimensional lithium-ion microbatteries are considered as promising candidates fill role, owing their high power density. Combined with silicon a high-capacity anode material, performance can be further enhanced. In this review, latest developments in three-dimensional silicon-based...
Abstract Since the performance of micro-electro-mechanical system (MEMS)-based microphones is approaching fundamental physical, design, and material limits, it has become challenging to improve them. Several works have demonstrated graphene’s suitability as a microphone diaphragm. The potential for achieving smaller, more sensitive, scalable on-chip MEMS yet be determined. To address large graphene sizes, graphene-polymer heterostructures been proposed, but they compromise due added polymer...
Food safety, particularly concerning foods contaminated by toxic chemicals, has emerged as a pervasive societal concern. The prevalence of food contaminants spurred both scientific communities and industries to develop highly sensitive selective sensors for rapid precise authentication. Noble metal nanoparticles (NPs) have garnered significant attention in this regard due their exceptional properties, including high sensitivity, selectivity, stability, target binding affinity, versatility...
Effective wastewater treatment is essential for mitigating organic pollutants, such as dyes and antibiotics. In this study, the enhancement of niobium pentoxide (Nb 2 O 5 ) nanostructures via molybdenum (Mo) doping to improve adsorption efficiency, selectivity, reusability investigated. Mo doping, successfully confirmed by X‐ray diffraction, energy‐dispersive spectroscopy, photoelectron demonstrates effective integration into Nb lattice, inducing lattice expansion modifying its structural...
Vertically aligned gallium nitride (GaN) nanowire (NW) arrays have attracted a lot of attention because their potential for novel devices in the fields optoelectronics and nanoelectronics. In this work, GaN NW been designed fabricated by combining suitable nanomachining processes including dry wet etching. After inductively coupled plasma reactive ion etching, NWs are subsequently treated chemical etching using AZ400K developer (i.e., with an activation energy 0.69 ± 0.02 eV Cr mask) to form...
We fabricated highly sensitive and selective ammonia gas sensors based on quartz crystal microbalance (QCM) platforms that were functionalized with electrospun polyvinyl acetate (PVAc) nanofibers doped various organic acids (i.e., oxalic, tartaric, citric acids). The structural chemical surface conditions of the nanofiber-based active layers top QCMs confirmed by scanning electron microscopy (SEM), atomic force (AFM), Fourier-transform infrared (FTIR) spectroscopy. sensitivity PVAc QCM...
We devised a low-cost mobile electronic nose (e-nose) system using quartz crystal microbalance (QCM) sensor array functionalized with various polymer-based thin active films (i.e., polyacrylonitrile, poly(vinylidene fluoride), poly(vinyl pyrrolidone), and acetate)). It works based on the gravimetric detection principle, where additional mass of adsorbed molecules polymer surface can induce QCM resonance frequency shifts. To collect process obtained sensing data sets, multichannel acquisition...
The demonstration of vertical GaN wrap-around gated field-effect transistors using nanowires is reported. with smooth a-plane sidewalls have hexagonal geometry made by top-down etching. A 7-nanowire transistor exhibits enhancement mode operation threshold voltage 1.2 V, on/off current ratio as high 108, and subthreshold slope small 68 mV/dec. Although there space charge limited behavior at source-drain voltages (Vds), the drain (Id) transconductance (gm) reach up to 314 mA/mm 125 mS/mm,...
A novel, highly sensitive and selective safrole sensor has been developed using quartz crystal microbalance (QCM) coated with polyvinyl acetate (PVAc) nanofibers. The nanofibers were collected on the QCM sensing surface an electrospinning method average diameter ranging from 612 nm to 698 relatively high Q-factors (rigid coating). Scanning electron microscopy (SEM) atomic force (AFM) used analyze PVAc nanofiber morphology, confirming its area roughness, which are beneficial in improving...