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Vicente Torres-Costa
Autonomous University of Madrid
Analytical chemistryNanotechnologyMaterials sciencePorous siliconSilicon
97Publications
16H-index
918Citations
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Publications 97
Newest
#1O. de Melo (UH: University of Havana)H-Index: 1
Last. Guillermo SantanaH-Index: 15
view all 11 authors...
Abstract The epitaxy of MoO2 on c-plane sapphire substrates is examined. A theoretical approach, based on density functional theory calculations of the strain energy, allowed to predict the preferred layer/substrate epitaxial relationships. To test the results of these calculations, MoO2/(0 0 1) Al2O3 heterostructures were grown using the chemically-driven isothermal close space vapour transport technique. At the early stages of the growth, two kinds of morphologies were obtained, using the same...
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#1Chloé Rodriguez (UAM: Autonomous University of Madrid)H-Index: 3
#2Paul M. DietrichH-Index: 13
Last. M. Manso-Silván (UAM: Autonomous University of Madrid)H-Index: 14
view all 8 authors...
Abstract Porous silicon (PSi) offers extremely attractive optical, electronic and biofunctional properties for the development of biosensors. In the present work, we have studied the step by step sandwich biofunctionalization cascade of a PSi platform by near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) and, in parallel, we have developed a three electrode PSi device sensitive to changes in surface conductance. Prior to the NAP-XPS characterization, the organosilanization with gly...
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#1Rehab Ramadan (UAM: Autonomous University of Madrid)H-Index: 1
#2K. Abdelhady (Minia University)H-Index: 5
Last. Raúl J. Martín-Palma (UAM: Autonomous University of Madrid)H-Index: 25
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Indium-tin oxide (ITO) is widely used as a transparent electrode for optoelectronic devices given its large transparency and high conductivity. However, the particular properties of this material greatly depend on the overall fabrication process. We report on the effect of four different postfabrication processes on ITO thin films grown by electron beam evaporation. More specifically, the effect on the overall properties of the evaporated ITO thin films of microwave plasma annealing, rapid therm...
1 CitationsSource
#1O. de Melo (UH: University of Havana)H-Index: 1
#2Y González (Institut national de la recherche scientifique)H-Index: 1
Last. Vicente Torres-Costa (UAM: Autonomous University of Madrid)H-Index: 16
view all 9 authors...
Chemically—driven isothermal close space vapour transport was used to prepare pure MoO2 thin films which were eventually converted to MoO3 by annealing in air. According to temperature-dependent Raman measurements, the MoO2/MoO3 phase transformation was found to occur in the 225 °C–350 °C range while no other phases were detected during the transition. A clear change in composition as well as noticeable modifications of the band gap and the absorption coefficient confirmed the conversion from Mo...
1 CitationsSource
#1Paola PellacaniH-Index: 6
#2Lucia FornasariH-Index: 4
Last. M. Manso-SilvánH-Index: 14
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Photonic and plasmonic systems have been intensively studied as an effective means to modify and enhance the electromagnetic field. In recent years hybrid plasmonic–photonic systems have been investigated as a promising solution for enhancing light-matter interaction. In the present work we present a hybrid structure obtained by growing a plasmonic 2D nanograting on top of a porous silicon distributed Bragg reflector. Particular attention has been devoted to the morphological characterization of...
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#2Ermei MäkiläH-Index: 39
Last. Jarno SalonenH-Index: 6
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Memristors are two terminal electronic components whose conductance depends on the amount of charge that has flown across them over time. This dependence can be gradual, such as in synaptic memristors, or abrupt, as in resistive switching memristors. Either of these memory effects are very promising for the development of a whole new generation of electronic devices. For the successful implementation of practical memristors, however, the development of low cost industry compatible memristive mat...
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#1Paola Pellacani (UAM: Autonomous University of Madrid)H-Index: 6
#2Vicente Torres-Costa (UAM: Autonomous University of Madrid)H-Index: 16
Last. M. Manso Silván (UAM: Autonomous University of Madrid)H-Index: 6
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Abstract The present work reports the processing of laser irradiated Si arrays (LISi) and underlines their surface enhanced Raman scattering (SERS) functionality. A nanostructured Si/SiO x surface forms providing additional fluidic and photoprotective properties. Because of their optical and surface characteristics, the arrays exhibit a SERS analytical enhancing factor of 500, without any noble metals such as gold or silver. Micro-Raman maps allowed studying LISi properties, identifying maximum ...
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#1Chloé RodriguezH-Index: 3
Last. M. Manso-SilvánH-Index: 14
view all 5 authors...
Porous silicon (PSi) is a versatile matrix with tailorable surface reactivity, which allows the processing of a range of multifunctional films and particles. The biomedical applications of PSi often require a surface capping with organic functionalities. This work shows that visible light can be used to catalyze the assembly of organosilanes on the PSi, as demonstrated with two organosilanes: aminopropyl-triethoxy-silane and perfluorodecyl-triethoxy-silane. We studied the process related to PSi ...
1 CitationsSource
#1O. Concepción (CINVESTAV)H-Index: 1
#2M. Galván-Arellano (CINVESTAV)H-Index: 5
Last. Osvaldo de Melo (UH: University of Havana)H-Index: 3
view all 8 authors...
Bi2Te3 is a well-studied material because of its thermoelectric properties and, recently, has also been studied as a topological insulator. However, it is only one of several compounds in the Bi–Te system. This work presents a study of the physical vapor transport growth of Bi–Te material focused on determining the growth conditions required to selectively obtain a desired phase of the Bi–Te system, i.e., Bi2Te3, BiTe, and Bi4Te3. Epitaxial films of these compounds were prepared on sapphire and ...
1 CitationsSource
#1Osvaldo de Melo-Pereira (UH: University of Havana)H-Index: 12
#2L. García-Pelayo (UAM: Autonomous University of Madrid)H-Index: 2
Last. Vicente Torres-Costa (UAM: Autonomous University of Madrid)H-Index: 16
view all 10 authors...
A novel procedure, based on a closed space vapor transport (CSVT) configuration, has been devised to grow films or flakes of pure MoO2 in a reductive atmosphere, at a relatively low temperature and using MoO3 as the source. In contrast to the conventional CSVT technique, in the proposed method a temperature gradient is not required for the growth to take place, which occurs through an intermediate volatile transport species that is produced in the complex reduction reaction of MoO3. An added val...
3 CitationsSource
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