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 9 of 9 for “"Ion dose"”.
-
Low ion dose imaging in the Helium Ion Microscope under Neyman Type A statistics
The Helium Ion Microscope (HIM) is a new tool capable of imaging at resolutions not possible in the ubiquitous Scanning Electron Microscope (SEM). However, along with this improvement in imaging, the helium ions used in HIM cause greater damage to samples. Reducing ion doses decreases the amount of …
-
MBE growth and investigation of (001) GaAs surfaces using SIMS
… been designed and constructed. After identification and elimination of various problems, high mobility, Si-doped , n-tYfe GaAs has been grown with electron concentration from ~ 5 x 10[to the power of]15 cm[to the power of]-3 (u 77 ~ 30,000 cm[squared]/Vs) to a solubility limit at ~ 7 x 10[to the …
-
GRAPHENE NANOSTUCTURING WITH THE HELIUM ION MICROSCOPE
… INTEREST FOR GRAPHENE?S POTENTIAL APPLICATIONS. HOWEVER, THE CONVENTIONAL FABRICATION TECHNIQUES, ARE EITHER LIMITED BY THE LITHOGRAPHIC RESOLUTION OR LIMITED TO FIXED GEOMETRIES. OUR GROUP HAS DEMONSTRATED A RESIST-FREE DIRECT PATTERNING METHOD TO MAKE SUB-10-NM ARBITRARY FEATURES ON …
-
Heavy-ion damage in copper, nickel and dilute nickel alloys
… that materials differ in their response to heavy-ion irradiation, the reasons for this are not yet fully understood. To more fully characterize the effects of material, alloying element, irradiation temperature and ion dose on the probability of collapse of a displacement cascade, Cu, Ni, and …
-
Effect of deposition conditions and doping on the structure, optical properties and photocatalytic activity of d.c. magnetron sputtered TiO2 thin films
… topic of this thesis was to investigate the relationship between the microstructure and the photocatalytic activity of TiO2 thin films, with respect to the catalytic breakdown of volatile organic compounds. TiO2 thin films were deposited by d.c. magnetron sputtering from sub-stoichiometric, …
-
On the Bone Tissue Response to Surface Chemistry Modifications of Titanium Implants
… implants play an important role in osseointegration. From 1990, a lot of engineering techniques have been applied to dental implant productions for improving their clinical performance by changing surface properties. In particular, surface chemistry modification enhanced the strength and speed of …
-
Low energy implantation of boron with decaborane ions
The goal of this dissertation was to determine the feasibility of a novel approach to forming ultra shallow p-type junctions (tens of nm.) needed for future generations of Si MOS devices. In the new approach, B dopant atoms are implanted by cluster ions obtained by ionization of decaborane …
-
Characterisation of focused ion beam nanostructures by transmission electron microscopy
Ion irradiation is an effective tool for the modifcation and control of the properties of magnetic thin films. Basic magnetic properties such as coercivity and local anisotropy direction can be altered in NiFe (Permalloy) films, whilst for Co/Pd multilayers, ion irradiation results in a transition …
-
Characterization of Amorphous Carbon Films for Mask Protection during Ion Beam Bombardment
… Though photons are the industry standard, atom/ion beam lithography is a specific niche wherein atoms or ions are used to transfer a mask pattern. Although this technique grants excellent flexibility as far as depth of field and diffraction limit, the use of massive particles causes mask damage, …