Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 22 for “"electrochemical etching"”.
-
Fabrication of nanofluidic devices using electrochemical etching of sacrificial copper
… copper layer was then dissolved using chemical etching, leaving an open channel with embedded gold electrodes. The majority of this work focuses on describing the metal etching process. All of the etching was performed by electrochemical dissolution of the copper, where an external electrical …
-
Fabrication of Tungsten Tips Suitable for Scanning Probe Microscopy by Electrochemical Etching Methods
… process. Of diverse methods, three different electrochemical etching methods: submerged method, single lamella drop-off method, and double lamella drop-off method are commonly used to make various tips' shapes such as smaller cone shape, larger cone shape, sharp cone shape, and extremely sharp …
-
Electrochemical fabrication of AuCo nanostructures
… released from the template and one component was electrochemically etched from the nanowires. The electrochemical etching conditions were predetermined by the investigation of electrochemical etching behavior of CoAu alloy and pure Co thin films. By precisely controlling the electrochemical …
-
Tomographic reconstruction and sub-surface imaging of porous nitride semiconductors
… phase epitaxy and a conductivity-selective electrochemical etching process — defect-mediated via nanoscale pipes formed at etched threading dislocations intrinsic to the heteroepitaxial growth process. A non-invasive, sub-surface, plan-view imaging modality that uses the backscattered …
-
Microstructural Control of Aluminum/aluminum Oxide Electrochemistry: Aluminum/aluminum Oxide Photonic Devices
… fabricated by the combination of modified electrochemical etching and anodization, is the first to be demonstrated. Intense luminance and luminous efficacies approaching 1800 cd/m2 and 4 lm/W, respectively, have been observed for 50 x 50 to 320 x 160 arrays of microplasma devices with …
-
Raman scattering in free standing porous Si films
… porous silicon films were prepared by electrochemical etching and the porous structure were lifted-off by a procedure based on electro-polishing. During Raman scattering measurements, the samples are exposed to relatively high intensity laser radiation. Free-standing porous Si sample …
-
A study of the molecular behavior in the vibronic and excitonic properties of silicon nanoparticles
… behavior of silicon nanoparticles, produced via electrochemical etching of a bulk precursor, is studied. The smallest particle, 1 nrn in diameter, is amenable to first principles modeling due to the manageable number of atoms in the structure. The ability to produce these particles in macroscopic …
-
Building practical apertureless scanning near-field microscopy
… the sharp tips are achieved by using electrochemical etching, and these tips are used to detect near-field signal. Separating the weak a-SNOM system signals from the undesired background signal, the higher demodulation background suppression is utilized by lock-in detection.
-
Effect of size and surface structure manipulation on the luminescent properties of silicon nanoclusters
… structural properties of silicon nanoclusters. Electrochemical etching was used to produce particles smaller than 3 nm in diameter. Electron microscopy and material analysis studies showed the particles to have a crystalline silicon core with significant structural reconstruction on the surface. …
-
The preparation of porous microcolumn arrays of silicon, and post-ionization of neutral particles from DIOS-MS
… First, a home-built apparatus combining electrochemical etching with laser irradiation was developed to produce microcolumn arrays on Si surfaces as a matrix-free DIOS-MS substrate. These surfaces have longer storage times, and are more damage-resistant to repeated laser exposure during …
-
The Fabrication of Thermoelectric Materials Using Functionalised Silicon Nanoparticles
… Phenylacetylene SiNPs were synthesised using electrochemical etching followed by functionalisation via a two-step chlorination-alkylation process. These particles were characterised and their thermal stability analysed, showing a maximum operation temperature of 200oC.
-
Porosity in Nitride Semiconductors
This thesis presents an exploration of how electrochemical etching (ECE) can be used to create pores in nitride semiconductors in order to engineer their properties. ECE offers a simple, flexible approach to pore formation, driven by an electric field between the material surface and a suitable …
-
Luminescent Silicon Nanoparticles: An improved inverse micelle synthesis and oxide-dependent photoluminescence studies
… samples of silicon nanoparticles synthesised by electrochemical etching, using a variety of oxygen-containing compounds to probe the behaviour of the photoluminescence spectrum. It is found that there are typically five Gaussian peaks present in a typical spectrum; occurring at 405 nm, 430 nm, …
-
Non-lithographic and scalable manufacturing of silicon micro & nanomaterials
… fabrication via thin-film dewetting and electrochemical etching, and (b) arbitrary-shaped 3D surfaces via direct electrochemical imprinting. Uniquely, they offer 3D dimensional control with sub-20 nm lateral and vertical resolution, mirror surface finish (i.e. RMS < 5 nm), high-aspect …
-
Ionic liquid ion source emitter arrays fabricated on bulk porous substrates for spacecraft propulsion
… technique within a thruster packaging process. Electrochemical etching is highly selective and can proceed at rates which are limited by mass transport conditions. In this thesis we show how this etching regime can be exploited to smoothly remove material from the surface of a bulk porous metal …
-
The fabrication of TiO2 nanostructures on porous silicon for thermoelectric application
… porous silicon samples were fabricated by electrochemical-etching (ECE) process which helps in providing large internal surface that can induce large absorption of TiO2 nanostructures. Optimization of etching time and current density supplied during the ECE process can alter the …
-
Effect of Topological Morphology on Optical Filtering Properties of Porous Silicon
… porous properties were manufactured by way of electrochemical etching. Different etching parameters (etching current, time, electrolyte concentration) were used on four different (in terms of crystal orientation and resistivity) types of samples in order to obtain a series of samples of …
-
Microscopy of porous nitride materials for long wavelength light emitting diodes
… InGaN superlattice (SL) template obtained by electrochemical etching has been adopted as a pseudo-substrate for the overgrowth of InGaN multiple quantum wells (MQWs). Partial strain relaxation with respect to the GaN buffer layer has been achieved in the InGaN SL template via porosification, …
-
Extensions to solid-state superionic stamping with applications to generating structural color
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
-
In Situ Surface Studies of III-V Semiconductor Compounds
… an atomically sharp tip via a two-step electrochemical etching and annealing procedure. An extensive and exhaustive investigation sought to produce a quantitative method for tip identification and etching parameterisation based on the available variables of differential sensitivity, …
Page 1 of 2