Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Synthesis, characterization, and ex-vitro effects of erbium oxide nanoparticles on Solanum lycopersicum(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2025-06) Robles Paris Moreno,Terry Isaac; López Mena, Edgar René; emipsanchez; Lozano Sánchez, Luis Marcelo; Sánchez Martínez, Araceli; Silva Jara, Jorge Manuel; School of Engineering and Sciences; Campus Monterrey; Navarro López, Diego EloyrWith the global population steadily increasing, the imperative to improve food production has become one of the greatest challenges of our times. In the pursuit of sustainable and innovative solutions, agricultural nanotechnology has emerged as a promising frontier. For this reason, this thesis is concerned with the synthesis of erbium oxide nanoparticles (Er2O3 NPs), their characterization, and the evaluation of their ex-vitro effects on tomato plants (Solanum ly- copersicum) under drought conditions. The findings underscore the importance of integrating innovative technologies into agricultural practices, offering a pathway towards resilient and resource-efficient food production systems in the face of mounting challenges. The charac- terization of Er2O3 NPs, performed using different spectroscopic and crystallographic tech- niques, will set the stage for the exploration of their biocompatibility with beneficial soil microorganisms, and their possible application in nanofertilization.
- ZnO/FTO based biosensor deposited via spin coating method for bacteria detection(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2023-12) Rojas Pablos, Ernesto; López Mena, Edgar René; dnbsrp; Ceballos Sanchez, Oscar; Sanchez Ante, Gildardo; Sanchez Martínez, Araceli; Escuela de Ingeniería y Ciencias; Campus Guadalajara; Navarro López, Diego EloyrTransparent oxide conductors have been an up-and-coming research topic thanks to their excellent conductive and optoelectric properties. This type of materials are the basis for some of the current technological advances in areas such as sensing devices, transistors, and solar cells. A biosensor consists of an analog component that translates the presence of biomolecules or minerals into an electrical signal that can be processed and later interpreted by the user for future work. The adaptation of nanotechnology to biosensors can provide nanoscale analysis for the detection of biomolecules. The deposition of different nanomaterials into biosensors has made possible the creation of highly sensitive and selective biosensors, which are desired properties for sensing devices. This research presents the design of a ZnO/FTO-based amperometric biosensor deposited via spin coating technique for bacteria detection on a molecular scale. The deposition of a ZnO thin film layer provides detection capabilities to the FTO in order to determine the presence of bacteria. As the ZnO thin film layer serves as an active region, the presence of the bacteria induces a change in the current measured through the biosensor when a voltage is applied. The characterization of the ZnO thin film as well as the electrical characterization of the biosensor were performed in order to prove the functionality of the device. Material characterization revealed a successful deposition of ZnO in the FTO glass substrate, obtaining a compact thin film consisting of spherical agglomerations of material. The electrical characterization reveled a change in current to different bacteria samples employed at different concentrations with \textit{Escherichia coli} showcasing the most sensitive results. The obtained biosensors proved to be functional for the detection of the presence of bacteria in very controlled parameters, proving ZnO as an effective alternative for future nano-biosensor devices.
- Synthesis and Characterization of Dye - Sensitized Solar Cells based on (Gd, Yb)-doped ZnO Nanoparticles and Sensitized by Natural Dyes(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2023-06) Vela Plata, Astrid Alicia; López Mena, Edgar René; emimmayorquin; Sánchez Ante, Gildardo; Ceballo Sánchez, Oscar; Navarro López, Diego Eloyr; School of Engineering and Sciences; Campus Ciudad de México; Sánchez Martínez, AraceliUnderstanding that sunlight is Earth's predominant source of energy, the development of sustainable solar power solutions is needed to address the challenges of energy consumption and production, as well as to mitigate the environmental impact of fossil fuel use. Dye-sensitized solar cells (DSSCs) are a promising alternative to conventional siliconbased solar cells due to their low cost, simple production, and environmentally friendly nature. By using natural dyes and non-toxic materials, DSSCs have the potential to reduce the environmental impact of solar cell production and increase the accessibility of renewable energy. In this work, DSSCs were developed using Zinc-oxide (ZnO) doped with lanthanide ions of Gadolinium (Gd) and Ytterbium (Yb) nanoparticles at four different concentrations, Zn1−xGdxO (0, 10 at. %), Zn1−xGd x2Yb x2O (10 at. %), Zn1−xYb xO (10 at. %) as semiconducting layers, sensitized with two different natural dyes extracted from blueberries (Vaccinium corymbosum) that have an anthocyanin based chemical structure and chlorophyl. The solar cells were subjected to I-V analyses under 1 sun illumination to determine the best combination. The results showed that the highest efficiency was obtained with the ZnO: Yb 10 at. % cell, with η= 0.00009%, ISC = 2.31 µA, VOC = 126.50 mV and FF = 29.19% from the chlorophyl dye, representing an increment of 150% from the chlorophyl ZnO: Yb 0 at. % cell with an efficiency of η = 0.00006%. The highest efficiency for the anthocyanin dye was η = 0.00007 % with ISC = 2.46 µA, VOC = 111 mV and FF = 26.97% from the ZnO: Yb 10 at. % cell, representing and increment of 985.91 % from the ZnO: Yb 0 at. % cell with an efficiency of η = 0.0000071% These findings suggest that the doping of ZnO nanoparticles with Yb in 10 at. % can enhance the overall performance of the cell in both dyes, providing a potential solution for more sustainable and efficient solar energy production.
- Preparation and characterization of dye sensitized solar cells based on ZnO doped with Er and sensitized by natural dyes(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-12-02) Rivera Calderón, Samantha Jackeline; López Mena, Edgar René; puemcuervo/tolmquevedo; Lozano Sánchez, Luis Marcelo; School of Engineering and Sciences; Campus Monterrey; Sánchez Martínez, AraceliIn order to manage and decrease the environmental impact caused by energy consumption and production, more sustainable sources are needed. Solar cells helps us harvest and use solar power, an inexhaustible source of energy, that is the largest and cleanest that humans have access to. Dye sensitized solar cells or DSSC have become increasingly popular due to their low cost, simple production, no toxicity, and suitable light harvesting properties therefore is being the object of research to find suitable materials and their combinations in order to harness solar energy more efficiently. In this work, DSSCs were prepared using Zinc-oxide (ZnO) doped with rare-earth ion Er (erbium) nanoparticles, at four different concentrations, Zn1−xErxO (0, 1.25, 2.50,5 at.%), as semiconducting layers, and sensitized with two different natural dyes extracted from raspberries (Rubus idaeus) that has an anthocyanin based chemical estructure, and curcumin (Curcuma Longa). I-V (current-voltage) analyses under 1 sun illumination were performed in all DSSCs in order to find the best combination and finally a circit model equivalent was obtain for all the DSSC. The highest efficiency obtained was η=0.00644% with a Isc=56.209 μA, Voc=338 mV and FF=33.908% from the anthocyanin dye ZnO:Er 1.25 at.% cell, representing an increment of 218 % from the anthocyanin ZnO:Er 0 at.% cell with an efficiency of η=0.00202%. The highest efficiency for the curcumin dye was η=0.00216% with a Isc=30.676 μA, Voc=238 mV and FF=29.619% from the ZnO:Er 1.25 at.% cell, representing and increment of 13.5% from the ZnO:Er 0 at.% cell with an efficiency of η=0.00191%. Given the increments in efficiency, the doping of ZnO nanoparticles with Er in 1.25 at.% enhances the overall performance of the cell in both dyes and the natural dye that had the overall highest efficiency, Isc, Voc and FF was the anthocyanin based. The circuit equivalent model for all DSSC follow the experimental behavior with less than 5% error for all the electrical parameters.