A5047358631- Silicon Nanostructures and Photoluminescence
- Nanowire Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Semiconductor materials and devices
- Photonic and Optical Devices
- ZnO doping and properties
- TiO2 Photocatalysis and Solar Cells
- Polymer Nanocomposites and Properties
- Supercapacitor Materials and Fabrication
- Music Technology and Sound Studies
- Sexual function and dysfunction studies
- Protein Degradation and Inhibitors
- Acute Myeloid Leukemia Research
- Pregnancy and Medication Impact
- Advanced Chemical Sensor Technologies
- Ga2O3 and related materials
- Epoxy Resin Curing Processes
- Smart Grid Security and Resilience
- Multiple Myeloma Research and Treatments
- Perovskite Materials and Applications
- Distributed systems and fault tolerance
- Acoustic Wave Phenomena Research
- Thermal and Kinetic Analysis
- Network Security and Intrusion Detection
Bayer (Finland)
2017-2021
University of Turku
2009-2016
Kyoto University
2011-2014
In the present work, porous silicon (PS) based Bragg reflectors are fabricated, and reactive PS surface is passivated by means of thermal carbonization (TC) acetylene decomposition. The gas sensing properties studied with different compositions concentrations. Based on results it can be concluded that thermally carbonized provide an easy inexpensive to produce chemically stable high quality good properties, which differ from those unpassivated reflectors.
Abstract Preparation of graded‐index optical microcavities based on porous silicon is demonstrated, and chemical modifications for obtaining improved stability under alkaline conditions are studied. Four surface modification methods stabilizing the samples examined, effects properties verified. Two different thermal carbonization treatments resulting in hydrophilic hydrophobic surfaces employed. In addition, with undecylenic acid performed as‐prepared thermally hydrocarbonized surfaces....
In this work, the feasibility of porous silicon particles for producing printed humidity sensors is examined. A proof concept provided by fully functional on a glass substrate drop casting particle solution top inkjet silver electrodes. Sensor sensitivity towards changes in relative The results show that provide good and reproducible throughout entire range. addition, negligibly small hysteresis accompanied relatively fast response recovery times also demonstrated.
A roll-to-roll compatible fabrication process of porous silicon (pSi) based sensing elements for a real-time humidity monitoring is described. The elements, consisting printed interdigitated silver electrodes and spray-coated pSi layer, were fabricated on coated paper substrate by two-step process. Capacitive resistive responses the examined under different concentrations humidity. More than three orders magnitude reproducible decrease in resistance was measured when relative (RH) increased...
: Thermally promoted addition of undecylenic acid is studied as a method for modifying porous silicon optical reflectors that have been pre-treated with thermal hydrocarbonization. Successful derivatization demonstrated and confirmed Fourier transform infrared X-ray photoelectron spectroscopies. The results indicate the hydrocarbonization pre-treatment considerably improves stability against oxidation chemical dissolution in basic environments. two-step treatment also does not cause an...
Stratified optical filters with distinct spectral features and layered surface chemistry were prepared on silicon substrates stepwise anodic porosification thermal carbonization. The use of differing parameters for successive carbonization treatments enabled the production hydrolytically stable porous silicon-based structures where adsorption water to lower layer is inhibited. This enables selective shifting reflectance bands by means liquid infiltration. merit using creating functionality...
Different designs for producing multiple stopband mesoporous silicon rugate filters via electrochemical anodization are compared. The effects of light absorption and dispersion to visible range filter design investigated. Thermal oxidation is applied passivating the chemically reactive porous surface, response passivated structures ethanol vapor examined. Differences in gas sensing properties various evaluated possible reasons observed differences discussed. Methods sidelobe suppression...
Abstract A capacitive type porous silicon based gas sensor for detecting amine vapours has been developed. The is highly sensitive, e.g., to methylamine and trimethylamine vapours, its electrical parameters recover totally after exposure studied gases. Thermal carbonization of under acetylene atmosphere was carried out produce stable attractive surface vapours. response can be separated from humidity changes since their responses act reversely. In addition the methylamine/water...
The current status and recent new applications of thermally carbonized porous silicon (TCPSi) are discussed in this paper. basic physicochemical properties TCPSi, relevant to the applications, also described information related mechanical, electrical optical TCPSi is introduced. Also, further functionalization PSi described.
Abstract Nanostructured porous silicon (PS) optical filters have been widely proposed for their use in biological and chemical sensing applications. Porous silicon, however, presents a reactive surface that must be adequately passivated order to achieve the required stability mandatory In present work, thermal carbonization by acetylene decomposition (TCAD) is shown provide effective passivation of PS internal surface, as well an enhancement device's sensitivity certain species. Moreover, it...
Zinc oxide (ZnO) nanorods were manufactured using the aqueous chemical growth (ACG) method, and effect of thermal acetylene treatment on their morphology, composition, optical properties was investigated. Changes in elemental content treated rods found to be different than previous reports, possibly due defect concentrations samples, highlighting importance synthesis method selection for process. Acetylene resulted a significant improvement ultraviolet photoluminescence rods. The greatest...
Porous silicon (PSi) is a versatile material for wide range of applications. Its large surface area combined with easily adjustable pore morphology and chemistry offers an excellent platform many different For example, the refractive index PSi strictly depending on porosity can be controlled by current density electrochemical etching. This enables precise control allows fabrication highly complex optical structures interesting However, decades, biggest stumbling block applications has been...
Some general points regarding the fabrication of thermally carbonized and hydrocarbonized porous silicon-based optical filters are discussed. The differences between two carbonization treatments pointed out, methods for further functionalization presented. Finally, effects aforementioned surface evaluated, usefulness resulting chemically modified structures in biosensing applications is demonstrated.
Abstract not Available.