Phospho-silicate sol-gel spin coating and dip coating films doped with QDs of PbS and PbSe, respectively. The concept, modeling and simulation of the optical temperature detection system. Data gathering communication, graphical user interfaces, reported tests and statistical results.
ACTIVITIES
1. Acquisition and optical, structural characterization of PbS and PbSe QDs, respectively, dispersed in organic solvents.
2. Design, elaboration and experimentation of the sol-gel spin coating synthesis route of phospho-silicate films doped with PbS QDs and PbSe, respectively, deposited on spinning substrates.
3. Design, elaboration and experimentation of the sol-gel spin coating synthesis route of phospho-silicate films with a complex composition, doped with PbS and PbSe QDs, respectively, deposited on spinning substrates.
4. Optical, structural and morphological characterization of sol-gel phospho-silicate films doped with PbS and PbSe QDs, respectively, deposited on spinning substrates.
5. Optical, structural and morphological characterization of sol-gel phospho-silicate films, with complex composition, doped with PbS and PbSe QDs, respectively, deposited on spinning substrates.
6. Design, elaboration and experimentation of the sol-gel dip coating synthesis route of phospho-silicate films doped with PbS QDs and PbSe, respectively, deposited on optical fibers.
7. Design, elaboration and experimentation of the sol-gel dip coating synthesis route of phospho-silicate films with a complex composition, doped with PbS and PbSe QDs, respectively, deposited on optical fibers.
8. Optical, structural and morphological characterization of sol-gel dip coating phospho-silicate films doped with PbS and PbSe QDs, respectively, deposited on optical fibers.
9. Optical, structural and morphological characterization of phospho-silicate sol-gel dip coating films with complex composition, doped with PbS and PbSe QDs, respectively, deposited on optical fibers.
10. Concept, design and engineering of the optical temperature detection system.
11. Simulation and modeling of the sensitive components of the optical temperature detection system.
12. Design and achievement of the electronic modules of the optical temperature detection system.
13. Prototyping of the opto-mechanical components of the optical temperature detection system.
14. Sensor design and implementation.
15. Sensor network design and data gathering communication protocol elaboration.
16. Implementation of web services based online remote server.
17. Physical data representation and application graphical user interfaces.
18. Tests and statistical results reporting.
19. Dissemination of the research results.
RESULTS
1. Sol-gel films, deposited by the spin coating technique, belonging to the oxide systems were experimented: SiO2-P2O5, SiO2-P2O5-Al2O3, SiO2-P2O5-ZnO, SiO2-P2O5-TiO2, SiO2-P2O5-ZrO2, SiO2– P2O5-Al2O3-PbS (QD-quantum dots) and SiO2-P2O5-Al2O3-PbSe (QD).
2. The homogeneity and uniformity of the films deposited on glass, ITO (indium oxide doped with tin) and silicon substrates was improved in strong acid medium (pH = 2) and in weak acid-neutral medium (pH = 6-7).
3. The uniformity, homogeneity and adhesion of the films with complex composition is better in the case of the SiO2-P2O5-Al2O3 oxide system compared to the complex oxide systems SiO2-P2O5-ZnO, SiO2-P2O5-TiO2 and SiO2-P2O5-ZrO2.
4. In the process of synthesis of sol-gel films, the following parameters were modified: the rotation speed of the substrates (glass, ITO and silicon), the deposition time of the films from the moment of preparation of the precursor solution until the moment of deposition, the pH of the solution precursors, the atmosphere in the heat treatment furnace (air / vacuum), the speed of temperature rise in the heat treatment furnace.
5. Homogeneous and uniform films were obtained at rotational speeds of substrates between 2000-3000 rpm.
6. Homogeneous and uniform films were obtained after 72 hours from the moment of preparation of the precursor solutions until the moment of deposition on rotating substrates, in case of a pH = 2.
7. Homogeneous and uniform films were obtained after 2 hours from the moment of preparation of the precursor solutions until the moment of deposition on rotating substrates, in case of a pH = 6-7.
8. Un-doped complex films are homogeneous and uniform after slow heat treatment in the oven, up to 200oC, followed by faster heat treatment in the oven, up to 400oC.
9. The complex films doped with PbS, respectively, PbSe keep the dopants in the structure (the brown color is maintained) after the heat treatment in vacuum, up to 200oC, thus preventing the oxidation of the dopants at temperatures of approx. 280-300oC.
10. The complex films doped with PbS, respectively, PbSe keep the dopants in the structure (the brown color is maintained) following a faster heat treatment in the oven (temperature rise rate approx. 1.2 oC / min).
11. The synthesized films were analyzed by transmission / absorption / reflection spectrophotometry, scanning electron microscopy, UV-VIS-NIR photoluminescence.
12. Transmission / absorption / reflection of the deposited films were analyzed compared to the substrates used.
13. The optical transmission of complex un-doped films deposited on the glass substrate is lower compared to the glass substrate.
14. The optical transmission of complex un-doped films deposited on the ITO substrate is higher in the NIR domain compared to the ITO substrate.
15. The reflection of complex un-doped films deposited on glass substrate and ITO is approx. 10% in the UV-VIS-NIR field.
16. The reflection of un-doped complex films deposited on the silicon substrate is lower compared to that of the silicon substrate due to the absorption of the film.
17. The Scanning Electron Microscopy (SEM) in cross section revealed the thickness, uniformity and homogeneity of the deposited films.
18. The SEM images in cross section highlighted the porous structure of the deposited films, this structure being specific to the sol-gel method, spin coating technique.
19. The thickness of the films deposited on the glass, ITO and silicon substrates largely depends on the adhesion to the substrate, specific to each composition, being of the order of hundreds of nanometers up to 3 μm.
20. The design, development and manufacture of contactless IR thermometer responds to the need for modern instrumentation for measuring non-contact infrared temperature on the surfaces of equipment/installations and industrial/residential constructions and also with a high potential for accurate temperature measurement in medical applications
21. Infrared thermometer is designed for measuring applications in difficult industrial conditions, it can be used indoors and outdoors in the workspace, due to the concept of portable measurement instrumentation, ideal for rapid measurements and inspections
22. Other common applications of the IR thermometer refer to the field of routine maintenance, preventive maintenance and industrial service.
23. The implementation of IR thermometry applications based on non-contact temperature measuring instruments provides a wide range of advantages of this technology: (i) Easy to operate; (ii) Works non-contact and ensures accurate measurements in a short span of a few seconds; (iii) Allows measurements to be made on the surface of very hot components or objects placed in hazardous environments; (iv) Locate the source of some problems without having to replace some components; (v) Detects weaknesses before causing major problems; (vi) It generates appreciable savings of time but also of the subsequent expenses.
DISSEMINATION
1. M. Elisa, I. C. Vasiliu, C. Elosua Aguado, F. J. Arregui, D. Lopez, D. Ulieru, X. Vila, J. Caridad Hernanández, M. Á. Casanova González, J. F. de Paz Santana, M. Enculescu, „Smart optical device for temperature sensing, based on innovative luminescent IV-VI quantum dots-doped complex nanostructured thin films”, The 25th International Exhibition of Inventics “INVENTICA 2021” Iași, România, 2021, Poster online, ISSN:1844-7880, Diploma of Honor, Gold Medal.
2. M. Elisa, C. R. Stefan, I. C. Vasiliu, C. Elosua Aguado, F. J. Arregui, D. Ulieru, X. Vila, J. Caridad Hernanández, M. Á. Casanova González, J. F. de Paz Santana, M. Enculescu, “Novel sol-gel IV-VI-doped inorganic thin films for temperature detection”, EUROMAT 2021, Session A2. Synthesis and applications of functional materials, Poster #1475 online.
3. M. Elisa, C. R. Stefan, I. C. Vasiliu, C. Elosua Aguado, F. J. Arregui, D. Ulieru, X. Vila, J. Caridad Hernanández, M. Á. Casanova González, J. F. De Paz Santana, I. Pana, M. Enculescu, „Advanced Sol-Gel IV-VI Quantum Dots-Doped Inorganic Thin Films for Temperature Sensing Instrumentation”, Conference IC-CMTP6, Miskolc-Lillafured, 2021, Abstract Book, pag.81, Poster, Short oral online communication.
4. Mihail Elisa, Ileana Cristina Vasiliu, Stefan Marian Iordache, Ana Maria Iordache, Iulian Pana, Monica Enculescu, Cesar Elosua Aguado, Fernando Javier Arregui, Dumitru Ulieru, Xavier Vila, Javier Caridad Hernández, Miguel Ángel Casanova González, Juan Francisco de Paz Santana, “Noi filme anorganice sol-gel dopate cu doturi cuantice IV-VI pentru instrumentatia de detectie a temperaturii”, “Advanced Sol-Gel IV-VI quantum dots-doped inorganic thin films for temperature sensing instrumentation”, CONSILOX XIII, Alba Iulia, Romania, 2021, Poster in situ, Program pag.23, Abstract Book, pag.103-104.