This study describes the structural and electronic properties of alkali (Li, Na and K), alkaline earth (Be, Mg and Ca) and transition (Cu, Ag and Au) metal adsorption on ZR2C structure. First-principles calculations based on the Density Functional Theory (DFT) were performed, using the SIESTA code with the generalized gradient approximations (GGA). The structure was generated parallel to the...
Curcumin is the main polyphenol in turmeric, which is a root from the Zingiberaceae family. Both have been widely reported to exhibit strong antioxidant and antifungal activities, demonstrating a high capacity to neutralize free radicals and protect against oxidative damage. Magnetite nanoparticles have been used in the biological field as nanocarriers for pharmaceuticals and other...
Carbon nanotubes (NTC´s) are novel artificial structures that have good mechanical, electrical and thermal properties. These properties have made the NTC´s object of application in the immobilization of enzymes for the manufacture of biosensors. In the present study, NTCs were used as support for the immobilization of the laccase enzyme to develop an amperometric biosensor for the...
In this talk, I will present a recent computational study applied to Kagome GdV6Sn6 nanomaterials. We compared results about the Fermi surface and the Haas van Alphen quantum oscillations with experimental data. The spin-orbit effect and high electron correlation due to f-orbitals are mandatory to reach a good agreement with the experiment. The angle-dependent dHvA oscillation frequencies...
The amount of fresh water on the planet is decreasing, however, in the atmosphere that amount is approximately 1.4 x 10^19 liters, which makes the atmosphere an almost inexhaustible source. This project, uses the dew point temperature to condense water on different nanostructured surfaces and configurations, to increase the condensation area. The study was developed using a Peltier cell, which...
This study presents the characterization of ethanol-assisted chemical vapor deposition (CVD) reduced graphene oxide and its application as a platform for electrochemical sensors. Using CVD, graphene oxide thin films were reduced on quartz substrates by varying the temperature and reduction time with ethanol to improve the electrical conductivity and electron exchange capacity of the material....
The identification of different chemical compounds and molecules is crucial, especially when they are toxic and humans are in direct contact with them, like Rhodamine B and Rhodamine 6G, that can be potentially toxic. Therefore, it is essential to employ sensitive techniques such as surface-enhanced Raman scattering (SERS), which can detect these compounds without damaging the sample and...
Titanium oxide (TiO2) is a highly relevant multifunctional material due to its catalytic and semiconducting properties, low toxicity, and excellent chemical and mechanical stability. In a tubular nanostructured form, TiO₂ plays an important role in the development of nanosensors. This morphology is crucial for the sensitivity of detection, increasing the surface area, which has an effect on...
CeO2 catalysts have been widely explored in oxidative reactions [1] however, in reductive reactions they have also been attractive for their redox properties. The synthesis of compound catalysts is usually long and multi-stage, resulting in core-shell or yolk-shell morphologies. In the present work, the microwave radiation-assisted one-pot synthesis of M@CeO2 catalysts is presented. The...
Electron beam lithography is an essential tool for fabricating micro and nano-scale devices, and an unlimited number of devices can be developed, such as sensors, MEMS, NEMS, and antennas, among others. These designs can modify the electrical, magnetic, optical, thermal, and mechanical properties of some materials; to achieve this, it is necessary to use this lithography technique, requiring...
The production of polyethylene terephthalate (PET) nanofibers by electrospinning is a modern and efficient method that uses the electric field for the production of fine fibers, allowing the fabrication of porous and versatile structures called scaffolds, organized by nanofiber units. This method has aroused great interest in the materials industry due to the unique properties they offer, such...
Mesoporous materials have the potential to be used in various areas, such as catalysis, adsorption of contaminating agents, controlled release of drugs, among others. In this work, the synthesis of mesoporous silica functionalized with thiol groups and amino groups is reported. Mesoporous silica was synthesized using the sol-gel method; tetraethyl orthosilicate (TEOS) was used as a precursor...
Various approaches are available for the nitrogen (N) doping of graphene oxide, but there needs to be more understanding of the N insertion mechanism using melamine as a precursor. N-doped graphene is widely recognized for its applications in oxygen reduction reactions (ORR). This study explored the mechanism of N insertion into graphene layers and investigated the influence of oxygen in this...
The elimination of dyes in the effluents of the textile industry currently represents a technological challenge in wastewater treatment processes, the present study reports on the evaluation of the photocatalytic properties of TiO2 nanostructures with controlled crystalline structure and immobilized on glass substrates. Using the dipping technique, electrospun TiO2 nanofibers were deposited on...
Due to its favorable electrical, structural, and optical characteristics, including high electron mobility and a direct band gap, the antimonide family provides an excellent alternative for developing more efficient and high-speed optical devices. Antimonide-based devices, such as light emitting and detection systems, operate in the near and mid-infrared region. Recently, significant interest...
The increasing demand for polymeric materials in various industries, including packaging, automotive, and electronics, has driven the need for improved mechanical properties in these materials. In the electrical industry, mechanical fatigue in insulating polymer coatings is a significant concern, leading to reduced electrical resistivity and potential safety hazards. This research focuses on...
The investigation of quantum coherence in nanostructures is a vital area of research with significant implications for the development of quantum information, communication, and sensing technologies. Traditionally, studies have focused on coherent tunneling phenomena within a limited set of quantum nanostructures, such as quantum dots or rings, resulting in the formation of delocalized...
The controlled growth of Ni nanoparticles supported in zeolite Y (NiY) is of great interest, for example, by the petroleum industry due to its bifunctional characteristic (C-C bond breaking and hydrogenation-dehydrogenation function). Although there are several methods of NiY synthesis (precipitation, coprecipitation, solid state, among others), the method of synthesis by ion exchange and...
We investigated how nanoemitters randomly distributed in single-walled carbon nanotubes (SWCNTs) can enhance laser emission when excited by plasmon-polariton (PP). We found that when the plasmonic frequency of the carbon nanotubes exceeds a critical value, the plasmon-polariton is macroscopically excited throughout the entire SWCNT. The laser generation time of the nanoemitters is strongly...
The demand for portable electrical energy is growing due to the use of mobile devices which satisfy daily needs. In that context the dichalcogenide TiTe2 has demonstrated a charging voltage of ~ 0.7 V (Zn2+/Zn) and a reversible capacity of 225 mAh/g [1]. Currently, it has been possible to synthesize the 1T-TiTe2 monolayer [2]. In this work, a systematic study was made of the Li/Na effect on...
Under the premise that TiO2 and Au nanoparticles exhibit good photocatalytic properties for the degradation of chemical contaminants in water, nanocomposites of TiO2/Au were synthesized in a 30% H2O2 and H2O solution using the laser ablation of solids in liquids technique. A Ti target was ablated with an energy of 475 mJ/pulse for 120 s, and in the same solution, an Au target was ablated...
Currently, one of the most outstanding advances in cutting-edge science is the self-assembly of quantum dots (QDs), a promising process in the field of nanotechnology. These nanostructures restrict the degrees of freedom of electrons, phonons, and photons, allowing the creation of optical and electronic devices with exceptional characteristics.To achieve devices with the unique properties...
An in-depth study of previously data for the synthesis of new carbon nanostructures is made. The Raman spectra and electron microscopy images obtained were analyzed to give a physical interpretation and a possible application related to electrical charge in storage systems. By using the experimental pulsed electric arc discharge method with a spinning anode (PEADSA), pulsed discharge was...
The thermoluminescence dosimeter (TLD) is a passive radiation detector whose response is proportional to the absorbed dose. Magnesium borate-based TLDs have an effective atomic number close to that of human tissue, making them useful in personal dosimetry. In the field of thermoluminescence dosimetry, the synthesis of new materials with a response to ionising radiation similar to that used in...
TiO2 layers have been widely used in diverse applications. Some of them can be improved with the used of nanostructures. For example, in perovskite solar cells, the efficiency is increased if the TiO2 electron transport layer is nanostructured. In Ti medical inserts, in another hand, the TiO2 layer on top, responsible of the biocompatibility, can also promote osteoblasts proliferation when...
Dielectric spheres made of polymethylmethacrylate, polystyrene or silicon dioxide, with diameters ranging from a few to several hundred nanometers, are commonly used as building-blocks of artificial opals or as templates for inverse opals. In particular, porous silica spheres have also been proposed as substrates for metal nanoparticles for SERS applications [1] . In this work, we have...
Throughout the years the semiconductor nanostructures like the quantum dots (QDs) have taken relevance in the industrial and academic fields due to the electron confinement properties they uphold, allowing for the harvesting of a wide range of the solar spectrum in photovoltaic technology, giving the user superior versatility and efficiency on devices such as TV screens for vibrant colors,...
Ultrasonic cavitation is the process of growth and collapse of vacuum cavities in a liquid when subjected to high-intensity ultrasonic waves. The ability to control the size and distribution of these particles is crucial for various industrial and technological applications, such as catalysis and regenerative medicine.
The objective is to establish a set of conditions that allow for more...
Through in situ monitoring of fuel cells in oxidation-reduction processes with high-energy X-ray diffraction for ternary systems (Pt-Pd-Co), the PDF is created through the Fourier transform of the diffraction pattern of a sample. It has been seen that the lattice strains in nanostructures are reflected in the oscillation of the peaks of the atomic pair distribution function (PDF). The analyses...
This work presents the preparation of multifunctional cotton textiles using TiO2 nanofibers. The obtaining of single-crystalline TiO2 nanofibers with high specific surface area synthesized by electrospinning technique with controlled crystal structure and morphology. The nanofibers were annealed at 500 °C in a controlled atmosphere in the presence of air for two hours to achieve crystalline...
The results of the encapsulation of a nanobioherbicide formulation of Puccina sp.- Ag NPs using the drip extrusion technique and chitosan as encapsulating polymer are presented. The synthesis of Ag nanoparticles was obtained by chemical reduction method. The Ag NPs were characterized by visual inspection, ultraviolet-visible spectroscopy and transmission electron microscopy (TEM). The...
In this work, we calculate the local density of states using dyadic Green's functions for a defective one-dimensional photonic crystal of finite size composed of polymeric layers. The spatial periodicity of the crystal is broken when infiltrating a cavity to detect a cancer cell. This work considers that the refractive index of polymeric materials changes with the applied pressure. We...
One-dimensional quantum semiconductor arrays are intriguing systems for exploring fundamental physical properties and potential electronic and optoelectronic applications [1]. In particular, such nanowire arrays exhibit anisotropic effects in their electronic transport and light emission properties [2]. Here, we report the dependence of polarization in the photoluminescence (PL) emission due...
The MeV ion implantation leads to the formation of surface ripple nano-patterns on diverse kind of materials, as metals, dielectrics, and semiconductors. Also, under oblique irradiation, the implanted ions are preferentially deposit on the crests of such patterns. Based on the previous experimental facts, this work shows the formation of gold nanoparticles arranged on surface nanopatterns...
In recent years, the use of colorants has increased in the food industry around the world, unfortunately, some illegal additives were detected. In particular, Rhodamine B and Rhodamine 6G have been detected in chili products, that is a disturbing situation because these products are part of the Mexicans daily life and could have negative effects on health. An ideal technique to detect these...
In recent decades, the excessive use of synthetic pesticides in crop systems has increased, resulting in ecosystem degradation and severe damage to human health. Currently, the mostcommonly used methods to determine pesticide concentration are either complex or limited in accessibility, which would make existing detection methods unsuitable for large-scale applications. Therefore, it is...
LaTiO3 (LTO) perovskite is a Mott-Hubbard insulator; however, its electronic and magnetic properties can be modulated by substitutional defects, quantum confinement or heterojunction with a semiconductor material such as Si. For this work, these effects were investigated using density functional theory (DFT). The model used consisted of cutting a slab from the LTO bulk phase so that the system...
Carbon quantum dots are a type of 0D spherical nanomaterials with different types of properties such as chemical stability, biocompatibility, low toxicity, modulable band gap, photoluminescence, electrochemical, and heteroatomic doping. These properties have allowed these nanomaterials to be used in different kinds of applications such as in vitro and in vivo cellular imaging, fluorescent...
The hydroxyapatite/reduced graphene oxide (HA/rGO) composite has great versatility in applications because it exhibits a synergistic effect of its properties due to the unique characteristics of its components, such as biocompatibility, chemical and thermal stability, high surface area, excellent mechanical properties, and electrical conduction. Nowadays, there are several synthesis...
Nanoscale semiconductor materials are among the most promising technologies for developing novel optoelectronic devices. This potential is especially significant when using well-known, highly remarkable semiconductor materials like those from the III-V family, with indium arsenide (InAs) being a notable example. InAs, with its direct band gap and high electron mobility at room temperature, is...
In this work, we have grown AlGaAs/GaAs quantum wells using Molecular Beam Epitaxy (MBE) on high-index GaAs substrates. We performed a comprehensive study of the structures employing a variety of characterization techniques. AlGaAs layers, serving as barrier materials, are crucial for confining electrons within the GaAs quantum well region. This confinement is essential for the functionality...
High-index substrates have long been of interest due to their surface physical properties. For example, GaAs (n11) surfaces with n = 1, 2, 3, … have provided promising results in solar cells demonstrating higher efficiency, terahertz devices, and have been employed in heteroepitaxial growth on GaN.
In this work, we focused on the investigation of growing AlGaAs/GaAs heterostructures on GaAs...
In clinical analysis, the use of contrast medium is of great importance because it allows the visualization of specific structures in cells and tissues, facilitating the detection of anomalies in the body and contributing to more precise and early diagnoses (1). However, current contrast medium methods have certain disadvantages, so developing new methods is an important area of research. In...
The double-walled carbon nanotubes can be synthesized using the pulsed electric arc discharge with the spinning anode method (PEADSA). With this method, the frequency of the pulsed discharge can be controlled, as well as the discharge onset, which directly affects the nucleation and growth of carbon nanotubes. In this work, the experimental diameter of the double-walled carbon nanotubes...
This work presents the results obtained from the synthesis of metallic Au and iron oxide nanoparticles through the laser ablation of a target immersed in different liquid media. Eight samples were synthesized using an Fe2O3 target, four different liquid media (acetone, bidistilled water, isopropanol, and ethanol), and two different laser intensities (475 and 640 mJ). Additionally, eight...
Currently, bimetallic nanoparticles are of great interest due to their optical, electronic and magnetic properties, since these can be improved compared to their monometallic counterparts. The applications of this type of nanoparticles in industry are of great relevance. For example, in medicine they are used for the treatment of cancer and are also used for water treatment through...
Due to a need for obtaining energy from non-fossil sources, the use of dimethyl ether (DME) as a high-efficiency fuel is a promising alternative. Its use implies zero emissions of CO2 and other toxic compounds. In this study, we propose the synthesis and characterization of nanostructured materials based on transitions metals (W oxide), supported on alumina, to be used in the methanol...
Silica spheres are widely used as catalysts, adsorbents, templates and substrates due to their large specific area and uniformity. In this work, we demonstrate that after low-temperature (≤400°C) heat treatments of the spheres, their optical response is modified without sintering effects or changes in their morphology. Initially, colloids of SiO₂ spheres were synthesized by the Stöber...
Enzyme replacement therapy (ERT) has been used to treat a few of the many existing diseases which originate from the lack of, or low enzymatic activity. Exogenous enzymes are administered to contend with the enzymatic activity deficiency. Nanotechnology has significantly impacted the development of medicine; a significant research effort is currently focused on the use of nanoparticles (NPs)...
