A5035398506- Semiconductor materials and devices
- Electronic and Structural Properties of Oxides
- Block Copolymer Self-Assembly
- Electron and X-Ray Spectroscopy Techniques
- Additive Manufacturing and 3D Printing Technologies
- Copper Interconnects and Reliability
- Additive Manufacturing Materials and Processes
- Photonic Crystals and Applications
- Metal and Thin Film Mechanics
- Nanofabrication and Lithography Techniques
- Silicon Nanostructures and Photoluminescence
- TiO2 Photocatalysis and Solar Cells
- Polymer Surface Interaction Studies
- Analytical Chemistry and Sensors
- Multiferroics and related materials
- Ga2O3 and related materials
- Photonic and Optical Devices
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Graphene research and applications
- Advancements in Photolithography Techniques
- Advanced Nanomaterials in Catalysis
- Corrosion Behavior and Inhibition
- Nonlinear Optical Materials Studies
- Botanical Research and Applications
Universidad Autónoma de Ciudad Juárez
2014-2024
Center for Research and Advanced Studies of the National Polytechnic Institute
2009-2023
Dublin City University
2019-2021
Institute of Engineering Science
2020
Universidad Autónoma de Ica
2020
Synchrotron soleil
2019
Trinity College Dublin
2019
Advanced Materials and BioEngineering Research
2019
I-Form Advanced Manufacturing Research Centre
2019
Nitrogen‐doped carbon inverse opal (CIO‐N) is synthesized by a two‐step process involving the infiltration of carbon‐nitrogen precursors within opals followed thermolysis and removal structure in hydrofluoric acid (HF). Undoped samples exhibit reflection peak red region spectrum whereas N‐doped display shifts to blue as nitrogen content increased. The degree crystallinity CIO‐N strongly depends upon on size precursor silica particles used prepare inverted opals. In addition, introduction...
In this work a new method is proposed to tackle down the multiple objective optimization problem of calculation cation distribution in spinels structure, through difference intensity ratios between experimental and calculated intensities sensitive Bragg planes, by introducing factor, Rabs, Bertaut method. This factor introduced as sum absolute R factors, it minimized varying distribution. To test aluminate manganese spinel where synthesized though modified Pechini characterized XRD. The...
This work identifies the critical factors when developing a polymer brush vapor phase infiltration process, while also demonstrating use of novel pyridines for area selective purposes.
One doublet is usually employed to fit the Si0 substrate species in Si 2p photoemission spectra from (001) H-terminated (after piranha treatment) and oxidized surfaces. However, there a second substrate-top component (ST) with binding energy of 0.3 eV higher than bulk component; its intensity varies ∼10% at normal emission (i.e., 90° surface) ∼20% 35°. It present even for surfaces does not correspond any suboxide species. corresponds first layers responsible decrease signal dip between two...
In this work, we show that in order to fabricate coherent titania (TiO2) films with precise thickness control, it is critical generate a complete polymer brush monolayer. To date, demonstrations of such dense monolayer formation can be utilized for inorganic infiltration have been elusive. We describe versatile bottom-up approach covalently and rapidly (60 s processing) graft hydroxyl-terminated poly(2-vinyl pyridine) (P2VP-OH) polymers on silicon substrates. P2VP-OH varying thicknesses...
A systematic angle resolved x-ray photoelectron spectroscopy study of the structure hafnia films grown on silicon with atomic layer deposition (ALD) is presented. The hafnium precursor employed was tetrakis dimethyl amino water as oxidant agent. number ALD cycles ranged from 3 to 25. Hf 4f spectrum shows two components 0.47 eV apart, one associated (17.6 eV) and other (18.1 a silicate interface layer. composition layer, HfxSi1-xOy, evolves continuously silicon-rich (x = 0.1 for cycles) rich...
Hafnium oxide nanofilms were grown with atomic layer deposition on H-terminated Si (001) wafers employing tetrakis dimethyl amino hafnium (TDMA-Hf) and water as precursors. While the number of cycles (30) aperture-time for TDMA-Hf (0.08 s) kept constant, (τH2O) oxidant-agent (H2O) was varied from 0 to 0.10 s. The structure films characterized robust analysis angle-resolved x-ray photoelectron spectroscopy. In addition a ∼1 nm layer, silicate interface also thick, is formed τH2O > 0....
In this work we present the results of a hard x-ray photoelectron spectroscopy (HAXPES) study on creation metallic copper layers via metal-salt infiltration into poly-2-vinylpyridine (P2VP) film. Metal salt inclusion is wet chemistry process which allows for fabrication both metal and oxide films by means infiltrating receptive polymer thin film with precursors. A infiltrated P2VP was subject to UV/Ozone treatment form annealed in-vacuo reduce copper. HAXPES transmission electron microscope...
We present a series of computer-assisted high-resolution transmission electron (HRTEM) simulations to determine Moiré patters by induced twisting effects between slabs at rotational angles 3°, 5°, 8°, and 16°, for molybdenum disulfide, graphene, tungsten selenide layered materials. In order investigate the electronic structure, numerical using density functional methods (DFT) was completed Cambridge serial total energy package (CASTEP) with generalized gradient approximation both band...
Thin films of OH terminated poly-2-vinylpyridine (P2VP), a polymer with potential for infiltration mediated thin film deposition, area selective deposition (ASD), and small feature size development via block copolymer (BCP) self-assembly, have been studied hard x-ray photoelectron spectroscopy. From the N 1s C core level spectra, accurate values binding energy positions species present in were obtained, providing clear evidence signals associated pyridine bonds. The aromatic ring on P2VP...
This work is motivated by the desire to develop a semiconductor device patterning technology based on precursor infiltration into block copolymer materials. Developing an understanding of preferential metal precursors one polymer blocks critical importance advance this approach. In study, salts were used as means diffuse ions poly 2-vinylpyridine (P2vP) brush layer (~4 nm thick) which was deposited spin coating silicon substrate. Thin P2vP films infused with aluminum nitrate and copper wet...