Pub Date : 2021-11-23DOI: 10.47566/2021_syv34_2-211123
M. A. Santana-Aranda
Professor Orlando Zelaya Angel was an outstanding member of the research community on Solid State Physics. He served as President to the Sociedad Mexicana de Ciencia de Superficies y Vacío (SMCSyV; currently Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales – SMCTSM), for the period 1995-1996. Professor Zelaya formed many researchers in Mexico, who continue developing research, either in Mexico, in their countries of origin, or abroad. Throughout the evolution of Superficies y Vacío, Professor Zelaya, contributed with sixteen articles on subjects ranging from thin films for optoelectronic applications, through hard coatings and studies on the process for production of Tortillas; covering most of his research areas of interest. Here is a subject-chronological compilation of the abstracts to his articles in Superficies y Vacío, after a year of his departure.
奥兰多·塞拉亚·安吉尔教授是固态物理学研究界的杰出成员。他曾担任墨西哥科学城市协会(Sociedad Mexicana de Ciencia de superses Vacío)主席;目前为墨西哥科学协会(网址:Tecnología superies y Materiales - SMCTSM)， 1995-1996年期间。塞拉亚教授在墨西哥组建了许多研究人员，他们继续在墨西哥、原籍国或国外开展研究。在Superficies (Vacío)的整个发展过程中，Zelaya教授发表了16篇文章，主题从光电应用的薄膜，到硬涂层和玉米饼生产过程的研究;涵盖了他感兴趣的大部分研究领域。以下是他离开一年后在Vacío上发表的文章摘要，按主题顺序汇编。
{"title":"In memoriam. Orlando Zelaya-Angel’s contributions in Superficies y Vacío","authors":"M. A. Santana-Aranda","doi":"10.47566/2021_syv34_2-211123","DOIUrl":"https://doi.org/10.47566/2021_syv34_2-211123","url":null,"abstract":"Professor Orlando Zelaya Angel was an outstanding member of the research community on Solid State Physics. He served as President to the Sociedad Mexicana de Ciencia de Superficies y Vacío (SMCSyV; currently Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales – SMCTSM), for the period 1995-1996. Professor Zelaya formed many researchers in Mexico, who continue developing research, either in Mexico, in their countries of origin, or abroad. \u0000Throughout the evolution of Superficies y Vacío, Professor Zelaya, contributed with sixteen articles on subjects ranging from thin films for optoelectronic applications, through hard coatings and studies on the process for production of Tortillas; covering most of his research areas of interest. Here is a subject-chronological compilation of the abstracts to his articles in Superficies y Vacío, after a year of his departure.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116282452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-28DOI: 10.47566/2019_SYV32_1-010001
Z. Correa-Pacheco, P. A. González-Fuentes, C. L. Tramón-Pregnan, S. C. Solorzano-Ojeda, A. Zúñiga-Quintana, M. A. S. Gutiérrez, J. Jiménez-Pérez
Nowadays, starch is an excellent biodegradable option instead of synthetic polymers, to avoid contamination. In this work, triticale starch from three varieties (Faraón, Peteroa and Aguacero) was isolated and the physico-chemical and thermo-rheological properties were evaluated. Also, mechanical properties of thermoplastic films using this starch were assessed. From the physico-chemical analysis it was found that the moisture, protein and lipids contents were slightly different among starches. Amylose value was similar. Thermo-rheological behavior measured by Mixolab® revealed that initial water uptake was higher for Faraón variety due to the grain morphology observed by Scanning Electron Microscopy (SEM). Values for gelatinization temperature obtained were 82.2 °C for Faraón starch, followed by Peteroa (72.0 °C) and finally Aguacero (65.6 °C). From the mechanical properties, Faraón thermoplastic starch (TPS) films showed the highest value of Young’s modulus (1.90 ± 1.09 MPa) for the composition 50/25/25 (starch/glycerol/water). The highest elongation at break (64.77 ± 14.14 %) was obtained for Peteroa composition 50/35/15 (starch/glycerol/water). Then, triticale mainly used to feed animals more than for human consumption, could be good alternative for preparing biodegradable films with potential applications in agriculture and food packaging.
{"title":"Physico-chemical and mechanical thermo-rheological characterization of three varieties of triticale starches","authors":"Z. Correa-Pacheco, P. A. González-Fuentes, C. L. Tramón-Pregnan, S. C. Solorzano-Ojeda, A. Zúñiga-Quintana, M. A. S. Gutiérrez, J. Jiménez-Pérez","doi":"10.47566/2019_SYV32_1-010001","DOIUrl":"https://doi.org/10.47566/2019_SYV32_1-010001","url":null,"abstract":"Nowadays, starch is an excellent biodegradable option instead of synthetic polymers, to avoid contamination. In this work, triticale starch from three varieties (Faraón, Peteroa and Aguacero) was isolated and the physico-chemical and thermo-rheological properties were evaluated. Also, mechanical properties of thermoplastic films using this starch were assessed. From the physico-chemical analysis it was found that the moisture, protein and lipids contents were slightly different among starches. Amylose value was similar. Thermo-rheological behavior measured by Mixolab® revealed that initial water uptake was higher for Faraón variety due to the grain morphology observed by Scanning Electron Microscopy (SEM). Values for gelatinization temperature obtained were 82.2 °C for Faraón starch, followed by Peteroa (72.0 °C) and finally Aguacero (65.6 °C). From the mechanical properties, Faraón thermoplastic starch (TPS) films showed the highest value of Young’s modulus (1.90 ± 1.09 MPa) for the composition 50/25/25 (starch/glycerol/water). The highest elongation at break (64.77 ± 14.14 %) was obtained for Peteroa composition 50/35/15 (starch/glycerol/water). Then, triticale mainly used to feed animals more than for human consumption, could be good alternative for preparing biodegradable films with potential applications in agriculture and food packaging.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124416869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
En el proceso de colada continua, los rodillos se utilizan para la contención, soporte, conducción y transporte de la losa. Para extender substancialmente la vida útil de los rodillos, la superficie está cubierta con una capa resistente al desgaste llamada revestimiento duro el cual es aplicado por medio de soldadura de recargue, para mejorar las superficies que se encuentran sometidas a desgaste severo, oxidación o corrosión de los rodillos. El objetivo del presente trabajo es estudiar el efecto del aporte térmico por medio de técnicas electroquímicas de un acero inoxidable martensítico 414N aplicado como revestimiento duro en agua de mar sintética. El proceso de soldadura para la aplicación de los recargues fue por medio de soldadura de arco con electrodo tubular (FCAW) variando el voltaje del arco. Las técnicas electroquímicas fueron polarización potenciodinámica (PP) y espectroscopia de impedancia electroquímica (EIS). Los resultados indican que todos los recargues presentan una estructura martensítica de listón, donde 26 V presentó un 5.44% de ferrita, 28 V 5.33% y 30 V 5.0%, se puede observar que con un alto aporte térmico empleado se obtiene la menor cantidad de ferrita. De los resultados electroquímicos se puede observar, para 30 V se tiene el comportamiento más activo teniendo un Ecorr de -535 mV/ECS, siendo para 26 V y 28 V los valores más nobles (-380 mV/ECS y -425 mV/ECS) respectivamente. Para los 28 y 30 V se presentan potenciales de ruptura de la pasividad (313 mV/ECS y 132 mV/ECS) respectivamente.
{"title":"Efecto del aporte térmico en la resistencia a la corrosión de un recubrimiento de acero inoxidable martensítico depositado por soldadura","authors":"Héctor Guillermo Carreón Garcidueñas, Ariosto Medina Flores, Engelbert Huape Padilla, Luis Béjar Gómez","doi":"10.47566/2019_syv32_1-010006","DOIUrl":"https://doi.org/10.47566/2019_syv32_1-010006","url":null,"abstract":"En el proceso de colada continua, los rodillos se utilizan para la contención, soporte, conducción y transporte de la losa. Para extender substancialmente la vida útil de los rodillos, la superficie está cubierta con una capa resistente al desgaste llamada revestimiento duro el cual es aplicado por medio de soldadura de recargue, para mejorar las superficies que se encuentran sometidas a desgaste severo, oxidación o corrosión de los rodillos. El objetivo del presente trabajo es estudiar el efecto del aporte térmico por medio de técnicas electroquímicas de un acero inoxidable martensítico 414N aplicado como revestimiento duro en agua de mar sintética. El proceso de soldadura para la aplicación de los recargues fue por medio de soldadura de arco con electrodo tubular (FCAW) variando el voltaje del arco. Las técnicas electroquímicas fueron polarización potenciodinámica (PP) y espectroscopia de impedancia electroquímica (EIS). Los resultados indican que todos los recargues presentan una estructura martensítica de listón, donde 26 V presentó un 5.44% de ferrita, 28 V 5.33% y 30 V 5.0%, se puede observar que con un alto aporte térmico empleado se obtiene la menor cantidad de ferrita. De los resultados electroquímicos se puede observar, para 30 V se tiene el comportamiento más activo teniendo un Ecorr de -535 mV/ECS, siendo para 26 V y 28 V los valores más nobles (-380 mV/ECS y -425 mV/ECS) respectivamente. Para los 28 y 30 V se presentan potenciales de ruptura de la pasividad (313 mV/ECS y 132 mV/ECS) respectivamente.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132771294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-15DOI: 10.47566/2018_SYV31_1-040058
José Refugio Martínez Mendoza, A. Nieto-Villena, J. A. Cruz-Mendoza, G. Ortega-Zarzosa, A. L. Guerrero-Serrano
Degradation of paper through time can be measured by monitoring the intensity changes in the band located at 620 nm of its emission fluorescence spectra. The behavior of this band is closely related to the structural stability of the short cellulose chains. A fast degradation of these cellulose chains, mainly lignin, translates in the rapid denaturation of paper occurring at its first aging state. This work proposes a method to reincorporate short cellulose chains in the structure of aged paper through its immersion during 24 h in a solution based on ethyl alcohol and extracts of wood pieces. Results of fluorescence spectra measurements indicate that the short cellulose chains in the solution get embedded in the old paper, making the shape and intensity of the fluorescence emission spectra peaks of new and old paper almost indistinguishable. This behavior provides a desirable approach to analyze, preserve and restore aged paper documents.
{"title":"Study of the behavior of short chains in print paper subjected to a natural aging","authors":"José Refugio Martínez Mendoza, A. Nieto-Villena, J. A. Cruz-Mendoza, G. Ortega-Zarzosa, A. L. Guerrero-Serrano","doi":"10.47566/2018_SYV31_1-040058","DOIUrl":"https://doi.org/10.47566/2018_SYV31_1-040058","url":null,"abstract":"Degradation of paper through time can be measured by monitoring the intensity changes in the band located at 620 nm of its emission fluorescence spectra. The behavior of this band is closely related to the structural stability of the short cellulose chains. A fast degradation of these cellulose chains, mainly lignin, translates in the rapid denaturation of paper occurring at its first aging state. This work proposes a method to reincorporate short cellulose chains in the structure of aged paper through its immersion during 24 h in a solution based on ethyl alcohol and extracts of wood pieces. Results of fluorescence spectra measurements indicate that the short cellulose chains in the solution get embedded in the old paper, making the shape and intensity of the fluorescence emission spectra peaks of new and old paper almost indistinguishable. This behavior provides a desirable approach to analyze, preserve and restore aged paper documents.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122565440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-15DOI: 10.47566/2018_SYV31_1-040063
S. Melo, O. Vigil, C. A. Hernandez-Gutierrez, F. A. Pulgarin-Agudelo, H. Mendoza-Leon, E. Rodríguez
In this work the influence of the deposition of SnO2 buffer layer on the optical, electrical and morphological properties of commercial conducting glasses is presented. Previously the transparent conducting oxide (TCO) were studied in order to determine which is the most appropriate in solar cell applications. The SnO2 thin films were deposited onto glass and commercial conducting glass by pneumatic spray pyrolysis (PSP) and magnetron sputtering techniques and characterized optically and electrically. TCO/buffer bi-layers configuration were processed and characterized through a modified well-known Haccke figure of merit. The results are discussed in terms of considering the usefulness or otherwise of this configuration, depending on the morphological quality of commercial conductive glass in the processing of second-generation solar cells in thin film technology.
{"title":"Deposition of SnO2 buffer layer onto commercial conducting glass to be used in thin films solar cells technology","authors":"S. Melo, O. Vigil, C. A. Hernandez-Gutierrez, F. A. Pulgarin-Agudelo, H. Mendoza-Leon, E. Rodríguez","doi":"10.47566/2018_SYV31_1-040063","DOIUrl":"https://doi.org/10.47566/2018_SYV31_1-040063","url":null,"abstract":"In this work the influence of the deposition of SnO2 buffer layer on the optical, electrical and morphological properties of commercial conducting glasses is presented. Previously the transparent conducting oxide (TCO) were studied in order to determine which is the most appropriate in solar cell applications. The SnO2 thin films were deposited onto glass and commercial conducting glass by pneumatic spray pyrolysis (PSP) and magnetron sputtering techniques and characterized optically and electrically. TCO/buffer bi-layers configuration were processed and characterized through a modified well-known Haccke figure of merit. The results are discussed in terms of considering the usefulness or otherwise of this configuration, depending on the morphological quality of commercial conductive glass in the processing of second-generation solar cells in thin film technology.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123234256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-15DOI: 10.47566/2018_syv31_1-030048
G. Abarca-Jimenez, Gabriel Romero-Paredes Rubio, M. Reyes-Barranca, M. Aleman-Arce, J. Munguia-Cervantes, S. Mendoza-Acevedo
This work presents the results of different surface micromachining processes done on a chip from On Semiconductor 0.5 µm commercially available CMOS technology. The intended objective is to fabricate a MEMS inertial transducer in a monolithic substrate, as the electronics for signal processing are based on a Floating Gate MOS transistor, fully integrated in the electromechanical structure. According to the available layers and design rules from the foundry, an inertial sensor chip was designed and fabricated, except the last post–processing step, i.e., the removal of the sacrificial layer and thus releasing the inertial structure based on a surface micromachining process, allowing the completed device to behave as designed.
{"title":"Surface micromachining of a micro electromechanical inertial transducer based on commercially available Floating Gate Transistor technology","authors":"G. Abarca-Jimenez, Gabriel Romero-Paredes Rubio, M. Reyes-Barranca, M. Aleman-Arce, J. Munguia-Cervantes, S. Mendoza-Acevedo","doi":"10.47566/2018_syv31_1-030048","DOIUrl":"https://doi.org/10.47566/2018_syv31_1-030048","url":null,"abstract":"This work presents the results of different surface micromachining processes done on a chip from On Semiconductor 0.5 µm commercially available CMOS technology. The intended objective is to fabricate a MEMS inertial transducer in a monolithic substrate, as the electronics for signal processing are based on a Floating Gate MOS transistor, fully integrated in the electromechanical structure. According to the available layers and design rules from the foundry, an inertial sensor chip was designed and fabricated, except the last post–processing step, i.e., the removal of the sacrificial layer and thus releasing the inertial structure based on a surface micromachining process, allowing the completed device to behave as designed.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116384547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-14DOI: 10.47566/2018_SYV31_1-020033
Maribel Gómez Franco, A. Ramírez Treviño, E. Figueras, Angel Sauceda Carvajal
This document presents the finite element modeling using ANSYS to obtain the thermal resistance of a MEMS thermal sensor. Additionally, the document describes a thermoelectrical characterization to find the sensor performance parameters. For modeling purposes, we divided the thermal sensor into four different thickness zones. We analyzed three different models, the first includes all materials layers, the second involves an equivalent thermal conductivity and an equivalent thickness for each zone, and the proposed model besides using an equivalent thermal conductivity by zone also considers the same thickness for all zones to reduce simulation time and to optimize thermal sensor design parameters. The first model evaluates three different boundary conditions, while the second and third models consider two different thermopile wide strips. The thermal resistance of the proposed model has a relative error of 11% in relation to the experimental value. The model, considering all layers and heat power applied to the surface as boundary conditions, has the lowest error (9%), while models considering the thermopile strips width have shown a higher error, 67%. As a result, the proposed model for heat transfer analysis simplifies complex geometries and reduces simulation time.
{"title":"Thermoelectrical characterization and comparative analysis of three finite element models of a MEMS thermal sensor","authors":"Maribel Gómez Franco, A. Ramírez Treviño, E. Figueras, Angel Sauceda Carvajal","doi":"10.47566/2018_SYV31_1-020033","DOIUrl":"https://doi.org/10.47566/2018_SYV31_1-020033","url":null,"abstract":"This document presents the finite element modeling using ANSYS to obtain the thermal resistance of a MEMS thermal sensor. Additionally, the document describes a thermoelectrical characterization to find the sensor performance parameters. For modeling purposes, we divided the thermal sensor into four different thickness zones. We analyzed three different models, the first includes all materials layers, the second involves an equivalent thermal conductivity and an equivalent thickness for each zone, and the proposed model besides using an equivalent thermal conductivity by zone also considers the same thickness for all zones to reduce simulation time and to optimize thermal sensor design parameters. The first model evaluates three different boundary conditions, while the second and third models consider two different thermopile wide strips. The thermal resistance of the proposed model has a relative error of 11% in relation to the experimental value. The model, considering all layers and heat power applied to the surface as boundary conditions, has the lowest error (9%), while models considering the thermopile strips width have shown a higher error, 67%. As a result, the proposed model for heat transfer analysis simplifies complex geometries and reduces simulation time.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129096385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-14DOI: 10.47566/2018_SYV31_1-020026
C. Sandoval-Ríos, M. Nieto-Pérez, Jorge A. Huerta, J. Pineda-Piñón, E. Rodriguez-Vazquez
Film growth, condensation and melting of materials are very important physical processes, involved in the development of semiconductor related industry processes, alkali metals and their oxides, and recently in nuclear fusion projects. The growth of low melting point thin films via liquid phase epitaxy (LPE) has drawn attention especially for the manufacture of semiconductor compounds containing indium, gallium, tin, lithium and their alloys, all characterized by a low melting point. That allows the growth of films in the liquid phase and subsequent control on crystallization morphology by manipulating quenching conditions. LPE yields highly crystalline either thin (a few nm) or thick (100s of µm) films with high purity. If LPE is performed in downward-facing substrates, Rayleigh-Taylor instabilities appear, and this effect of gravity in the film growth has not been studied in depth. This paper presents the design, construction and preliminary testing of an experimental facility to study film growth from the liquid phase, and also condensation and melting processes. This facility consists of a thermal evaporator and a substrate holder where samples are placed facing down. The size of the sample holder and the ability to achieve controlled thermal gradients across it, would allow the study of temperature effect in grown films morphology, and also in condensation and melting phenomena such as dripping onset and critical angle for film/drop displacement. Besides, system allows to study condensation modes and surface roughness on the condensation dynamics of liquid films growing from the vapor phase.
{"title":"An experimental facility to study film growth on liquid phase, condensation and melting in downward-facing substrates","authors":"C. Sandoval-Ríos, M. Nieto-Pérez, Jorge A. Huerta, J. Pineda-Piñón, E. Rodriguez-Vazquez","doi":"10.47566/2018_SYV31_1-020026","DOIUrl":"https://doi.org/10.47566/2018_SYV31_1-020026","url":null,"abstract":"Film growth, condensation and melting of materials are very important physical processes, involved in the development of semiconductor related industry processes, alkali metals and their oxides, and recently in nuclear fusion projects. The growth of low melting point thin films via liquid phase epitaxy (LPE) has drawn attention especially for the manufacture of semiconductor compounds containing indium, gallium, tin, lithium and their alloys, all characterized by a low melting point. That allows the growth of films in the liquid phase and subsequent control on crystallization morphology by manipulating quenching conditions. LPE yields highly crystalline either thin (a few nm) or thick (100s of µm) films with high purity. If LPE is performed in downward-facing substrates, Rayleigh-Taylor instabilities appear, and this effect of gravity in the film growth has not been studied in depth. This paper presents the design, construction and preliminary testing of an experimental facility to study film growth from the liquid phase, and also condensation and melting processes. This facility consists of a thermal evaporator and a substrate holder where samples are placed facing down. The size of the sample holder and the ability to achieve controlled thermal gradients across it, would allow the study of temperature effect in grown films morphology, and also in condensation and melting phenomena such as dripping onset and critical angle for film/drop displacement. Besides, system allows to study condensation modes and surface roughness on the condensation dynamics of liquid films growing from the vapor phase.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126454258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-14DOI: 10.47566/2018_syv31_1-020039
A. Reyes-Contreras, M. A. C. López, L. Romero‐Salazar, E. Camps
In this work, we report the fabrication of bismuth thin films on glass substrates by Pulsed Laser Deposition. A focused beam of a Nd:YAG laser (9 ns, 10 Hz, 1064 and 532 nm) was utilized to carry out the ablation of a high purity Bi target. The per pulse laser fluence was varied between 0.95 and 1.35 J/cm2, depending on the laser wavelength used. The deposits were characterized by SEM and XRD to analyze the surface morphology of thin films and their crystalline structure, respectively. The SEM micrographs showed differences in roughness, which increased with the laser wavelength. The diffractograms revealed the formation of Bi thin films with a polycrystalline structure or with a preferential orientation, depending on the mean kinetic energy of the plasma ions. The as deposited bismuth thin films were irradiated with a non-focused laser beam at low energies below the ablation threshold. In the laser treated area, it could be observed the formation of periodic structures, known as LIPSS (laser induced periodic surface structures). Depending on the crystallographic structure of the irradiated film, the formed LIPSS showed different characteristics, such as width and shape.
{"title":"Study of LIPSS formation on bismuth thin films deposited by Pulsed Laser Deposition","authors":"A. Reyes-Contreras, M. A. C. López, L. Romero‐Salazar, E. Camps","doi":"10.47566/2018_syv31_1-020039","DOIUrl":"https://doi.org/10.47566/2018_syv31_1-020039","url":null,"abstract":"In this work, we report the fabrication of bismuth thin films on glass substrates by Pulsed Laser Deposition. A focused beam of a Nd:YAG laser (9 ns, 10 Hz, 1064 and 532 nm) was utilized to carry out the ablation of a high purity Bi target. The per pulse laser fluence was varied between 0.95 and 1.35 J/cm2, depending on the laser wavelength used. The deposits were characterized by SEM and XRD to analyze the surface morphology of thin films and their crystalline structure, respectively. The SEM micrographs showed differences in roughness, which increased with the laser wavelength. The diffractograms revealed the formation of Bi thin films with a polycrystalline structure or with a preferential orientation, depending on the mean kinetic energy of the plasma ions. The as deposited bismuth thin films were irradiated with a non-focused laser beam at low energies below the ablation threshold. In the laser treated area, it could be observed the formation of periodic structures, known as LIPSS (laser induced periodic surface structures). Depending on the crystallographic structure of the irradiated film, the formed LIPSS showed different characteristics, such as width and shape.","PeriodicalId":423848,"journal":{"name":"Superficies y Vacío","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122602757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-15DOI: 10.47566/2015_syv28_1-010025
E. Campos González, Á. Guillén Cervantes, J. Santoyo Salazar, O. Zelaya Ángel, L. E. Ramírez Velázquez, J. Santos Cruz, S. A. Mayen Hernández, F. de Moure Flores, M. Olvera, G. C. Contreras Puente
Cadmium peroxide films were grown by chemical bath deposition on glass slides at 50 °C using CdCl2 as cadmium source. Films were deposited at different nominal cadmium concentrations. As-grown films were annealed in air at 300 °C for obtaining cadmium oxide thin films. The structural, morphological, optical and compositional properties of CdO films were analyzed in terms of the cadmium nominal composition and the annealing effect.
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