Готові списки джерел за темами / Quantum dots glass

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Добірка наукової літератури з теми "Quantum dots glass"

Автор: Grafiati

Опубліковано: 13 квітня 2024

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Статті в журналах з теми "Quantum dots glass"

Zhang, Jian, and Jia Wei Sheng. "Copper Quantum Dots Formation in a Borosilicate Glass." Journal of Nano Research 32 (May 2015): 66–70. http://dx.doi.org/10.4028/www.scientific.net/jnanor.32.66.

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This Borosilicate glass offers superior properties to the ordinary silicate glass. Metallic quantum dots embedded in glass are promising materials which can be used in modern optical devices. However, the introduction of metallic quantum dots into borosilicate glass has not been studied. We investigated the formation of copper quantum dots in Cu-doped borosilicate glass matrix using thermal annealing process. The reductant SnO included in borosilicate glass played an important role in the formation of the metallic quantum dots. Specifically, Cu quantum dots were formed only when SnO content reached at least 0.5 wt% after borosilicate glass was heated at 600 °C for 60min, which was evidenced by the detection of the characteristic absorption band at about 560nm originated from the surface plasmon resonance of Cu nanoparticles. The optimal concentration of SnO was found to be 1.5 wt% and the mean size for the heating-induced Cu quantum dots was calculated to be ~1.7 nm. Our data offer a simple approach to prepare the metallic quantum dots in borosilicate glass matrix and suggest a new type of metallic quantum dots for applications where superior durability, chemical and heat resistance are required.

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Kim, Bok Hyeon, Dong Hoon Son, Seongmin Ju, Chaehwan Jeong, Seongjae Boo, Cheol Jin Kim, and Won-Taek Han. "Effect of Aluminum on the Formation of Silver Metal Quantum Dots in Sol–Gel Derived Alumino-Silicate Glass Film." Journal of Nanoscience and Nanotechnology 6, no. 11 (November 1, 2006): 3399–403. http://dx.doi.org/10.1166/jnn.2006.020.

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The effect of aluminum incorporation on silver metal quantum dots formation in the alumino-silicate glass film processed by sol–gel process was investigated. The sol–gel derived glass was coated onto the silica glass plate by spin coating with the mixture solution of tetraethyl orthosilicate (TEOS), C2H5OH, H2O, AgNO3, Al(NO3)3·9H2O, and HNO3 with the molar ratios of Ag/Si = 0.12 and Al/Si varying from 0 to 0.12. The formation of the silver metal quantum dots was confirmed by the measurements of the UV/VISoptical spectra, the X-ray diffraction patterns, and the transmission electron microscope images. While the radius of silver metal quantum dots increased with the increase of aluminum concentration, the concentration of the silver metal quantum dots decreased. The formation of the silver metal quantum dots was found strongly suppressed by incorporation of aluminum ions in the glass. The change in the glass structure due to the aluminum incorporation was investigated by the analysis of the Raman spectra. The silver ions in the glass contributed to form stable (Al:Ag)O4 tetrahedra by pairing with aluminum ions and thus clustering of silver metal quantum dots was hindered.

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Jia, Rui, De-Sheng Jiang, Ping-Heng Tan, and Bao-Quan Sun. "Quantum dots in glass spherical microcavity." Applied Physics Letters 79, no. 2 (July 9, 2001): 153–55. http://dx.doi.org/10.1063/1.1380732.

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VERMA, ABHISHEK, P. K. PANDEY, J. KUMAR, S. NAGPAL, P. K. BHATNAGAR, and P. C. MATHUR. "GROWTH DYNAMICS OF II–VI COMPOUND SEMICONDUCTOR QUANTUM DOTS EMBEDDED IN BOROSILICATE GLASS MATRIX." International Journal of Nanoscience 07, no. 02n03 (April 2008): 151–60. http://dx.doi.org/10.1142/s0219581x08005250.

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Wide bandgap II–VI semiconductor quantum dots embedded in glass matrix have shown great potential for opto-electronic device applications. The current problem is to achieve low size dispersion, high volume fraction, and better control over the size of the quantum dots in glass matrix. In this work, a modified growth method has been proposed to achieve a greater control over the size of quantum dots, to reduce their size dispersion and to increase their volume fraction. A theoretical model has been developed to quantitatively estimate the various parameters of the quantum dots. The effects of aging on various parameters of quantum dots in Semiconductor-Doped Glass (SDG) samples have also been discussed in the present work.

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Zhao, Weigang, Cuirong Liu, and Xu Yin. "Cs4PbBr6 Combined with Graphite as Anode for High-Performance Lithium Batteries." Metals 12, no. 10 (September 23, 2022): 1584. http://dx.doi.org/10.3390/met12101584.

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Cs4PbBr6 quantum dots are glass-based materials. The perovskite structural material of Cs4PbBr6 quantum dots has shown an unexpected electronic performance. However, the glass-based Cs4PbBr6 quantum dots’ capacity becomes weaker when running in charge/discharge. Here, graphite was introduced to Cs4PbBr6 quantum dots using the grinding method to enhance the cycling stability of Cs4PbBr6 quantum dots. The 10%, 25%, 35%, 40%, 75% content Cs4PbBr6 quantum dots were added to graphite (CQDs/G) and CQDs/G as an active material for lithium anode in electronic testing. The test results displayed 35% Cs4PbBr6 quantum dots content in CQDs/G, showing an excellent cycle performance (136.5 mAh g−1 after 1000 cycles at 0.5 A g−1 current density) and good rate ability. Graphite protected the CQDs in the long term, and has high potential economic value.

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Sonawane, R. S., S. D. Naik, S. K. Apte, M. V. Kulkarni, and B. B. Kale. "CdS/CdSSe quantum dots in glass matrix." Bulletin of Materials Science 31, no. 3 (June 2008): 495–99. http://dx.doi.org/10.1007/s12034-008-0077-2.

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Kaushik, Diksha, Madhulika Sharma, A. B. Sharma, and R. K. Pandey. "Study of Self-Organized CdS Q-Dots." Journal of Nanoscience and Nanotechnology 8, no. 8 (August 1, 2008): 4303–8. http://dx.doi.org/10.1166/jnn.2008.an38.

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Self-organized cadmium sulfide quantum dots assembled using wet synthesis route on glass/ITO as well as Si(100) substrates have been investigated, using X-ray diffraction and transmission electron microscopy. The quantum dots have been shown to grow with a strong (111) orientation with narrow size distribution. Self-organized growth of the quantum dots was examined by high resolution imaging with an atomic force microscope. It is shown that increased self-organization is obtained on silicon substrate. The role of surfactant in imparting self-organization has been invoked to explain the observed morphological features. The as grown Q-dots exhibited size dependent blue shift in the absorption edge. The luminescence behavior of the quantum dots self-organized on glass/ITO as well as Si(100) substrate has also been examined. It is shown that substantial enhancement in luminescence yield is obtained for quantum dots grown on silicon substrate. A model to explain the observed luminescence enhancement has also been presented.

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Kolobkova, E. V., A. V. Polyakova, A. N. Abdrshin, N. V. Nikonorov, and V. A. Aseev. "Nanostructured glass ceramic based on fluorophosphate glass with PbSe quantum dots." Glass Physics and Chemistry 41, no. 1 (January 2015): 127–31. http://dx.doi.org/10.1134/s1087659615010137.

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Kuznetsova, M. S., R. V. Cherbunin, V. M. Litvyak, and E. V. Kolobkova. "Spectroscopy of PbS and PbSe quantum dots in fluorine phosphate glasses." Физика и техника полупроводников 52, no. 5 (2018): 497. http://dx.doi.org/10.21883/ftp.2018.05.45841.30.

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AbstractTransmission spectra of the narrow-bandgap semiconductor quantum dots PbS and PbSe in the fluorine phosphate glass are experimentally studied at different temperatures. Energies of 1s exciton transitions observed in the absorption spectra are used to determine characteristic sizes of the quantum dots under study. A nontrivial temperature behavior of the ground and excited quantum confined states in the quantum dots of different sizes are observed.

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Yükselici, M. H., Ç. Allahverdi, and H. Athalin. "Zinc incorporation into CdTe quantum dots in glass." Materials Chemistry and Physics 119, no. 1-2 (January 2010): 218–21. http://dx.doi.org/10.1016/j.matchemphys.2009.08.057.

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Більше джерел

Дисертації з теми "Quantum dots glass"

Poliakova, A. V., E. V. Kolobkova, A. N. Abdrshin, N. V. Nikonorov, and V. A. Aseev. "Optical Properties of PbSe Qantum Dots Doped in Fluorophosphate Glasses." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35364.

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PbSe quantum dots (QDs) were synthesed in fluorophosphate glass and their absorption and lumines-cence properties were investigated. The effect of the duration of the heat treatment on the spectral-luminescent properties was considered. The average diameter of the synthesized quantum dots has been calculated. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35364

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Wang, Zheng. "Synthesis, properties and applications of glasses containing chalcogenide quantum dots." Electronic Thesis or Diss., Université de Rennes (2023-....), 2023. http://www.theses.fr/2023URENS093.

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Dans cette thèse, la synthèse, les propriétés et les applications de verres contenant des quantum dots (QDs) de chalcogénure ont été étudiées. Des verres contenant des QDs à base de chalcogénure de plomb (PbSe ou PbS) ont été préparés. Leurs propriétés optiques et leurs applications potentielles ont été explorées en combinaison avec le co-dopage aux ions Tm3+. De plus, sur la base de ces résultats, des verres contenant des QDs de ZnS ou de ZnSe, sans plomb, ont été préparés avec succès. Leurs performances luminescentes ont été encore améliorées par dopage avec des ions de métaux de transition représentés ici par le nickel. Ces résultats jettent les bases pour l’amélioration des propriétés optiques de verres contant des QDs à base de chalcogénure de plomb et aussi pour le développement de verres aux QD sans métaux lourds et donc plus respectueux de l’environnement. Bien que des améliorations futures soient possibles et nécessaires pour des applications réelles, ces verres aux QDs de chalcogénure, développés dans ce travail, présentent un potentiel d'applications dans les domaines des concentrateurs solaires luminescents, de l'anti-contrefaçon optique, de l'éclairage à semi-conducteurs et de la mesure optique de la température
In this dissertation, the synthesis, properties and applications of glasses containing chalcogenide quantum dots (QDs) have been studied. Multicomponent lead chalcogenide QDs glasses (containing PbSe or PbS QDs) were successfully prepared, and their optical properties and potential applications were explored in combination with rare earth Tm3+ ion doping. In addition, based on the results, lead-free and environmentally friendly chalcogenide QDs glasses (containing ZnS or ZnSe QDs) were successfully prepared, and its luminescent performance was further improved by doping with transition metal nickel ions. These results lay the foundation for the improvement of optical properties of lead-based chalcogenide QDs and for the development of environmentally friendly heavy metal-free chalcogenide QDs glasses. Although future improvements are possible and necessary for practical applications, these chalcogenide QDs glasses developed in this work have application potential in the fields of luminescent solar concentrators, optical anti-counterfeiting, solid-state lighting, and optical temperature sensing

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Gonsalves, Peter Robert. "THE DESIGN AND FABRICATION OF A MICROFLUIDIC REACTOR FOR SYNTHESIS OF CADMIUM SELENIDE QUANTUM DOTS USING SILICON AND GLASS SUBSTRATES." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/720.

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A microfluidic reactor for synthesizing cadmium selenide (CdSe) quantum dots (QDs) was synthesized out of a silicon wafer and Pyrex glass. Microfabrication techniques were used to etch channels into the silicon wafer. Holes were wet-drilled into the Pyrex glass using a diamond-tip drill bit. The Pyrex wafer was anodically bonded to the etched silicon wafer to enclose the microfluidic reactor. Conditions for anodic bonding were created by exposing the stacked substrates to 300V at ~350oC under 5.46N of force. A syringe containing a room temperature CdSe solution was interfaced to the microfluidic reactor by using Poly (dimethylsiloxane) (PDMS) as an interface. The reactor was placed on a hot plate at 225oC, creating thermodynamic conditions for the QD chemical reaction to occur within the etched channels. Tygon® tubing transported solutions in and out of the microfluidic reactor. The CdSe solution was injected into the reactor by a syringe pump at an injection rate of 5 mL/hr, with a channel length of 2.5 cm. While in the microfluidic channels, QD residence time of approximately 30 seconds was sufficient enough for nucleation and growth of QDs to occur. The QD size was characterized by fluorescence full-width-half-maximum (FWHM), which is directly proportional to size distribution. The FWHM of the QDs synthesized was 38 nm, with a peak wavelength of 492 nm. By controlling combinations of pump rate and channel length, a range of QD sizes was able to be consistently synthesized through the microfluidic reactor with significant repeatability and reproducibility.

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Kumar, Ganapathy. "Enhanced verdet constant via quantum dot doped glass samples a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2008. http://proquest.umi.com/pqdweb?index=0&did=1597632931&SrchMode=1&sid=3&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1268920533&clientId=28564.

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Hsung, Chung Wu, and 鍾武雄. "Development of deep glass-etching technology for fabricating a microreactor of synthesizing composite quantum dots." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/11317703186460532248.

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碩士
國立臺灣師範大學
機電科技研究所
94
In this report, we fabricated an all-glass microreactor chip and used it to synthesize compound quantum dots. A microreactor chip integrates micro channels, a micro mixer, a Pt heater, and a temperature sensor on one glass chip. During fabrication of micro channels, a thick photoresist and Cr/Au layer were used as etching masks. Such etching masks could sufficiently reduce pinhole phenomenon. In addition, if we replaced aqua regia with KI solution, it would not damage the photoresist. Therefore, it could improve defects at edge of micro channels. If we considered annealing factor with different glass materials, the experimental results showed that if we annealed Pyrex 7740 to 600 ℃ and etched micro channels by using HF for 10 min, the channel width was found to be reduced from 498 m to 278 m. The lateral underetching ratio decreased from 5 to 0.96. Thus, we could improve the large lateral underetching of glass (Pyrex 7740) by annealing. However, the surface roughness of micro channels was high. On the other hand, it was not necessary for Corning 1737 to be annealed. We could get smaller lateral underetching ratio and better surface roughness of micro channel. As for Soda-lime, it didn’t have any relationship between annealing and lateral underetching ratio, but the surface roughness was high. Consequently, Corning 1737 was suitable material for making microreactor chip. For preparation of compound quantum dots, microfluidic systems have good characteristic on good mass and heat transfer. It can precisely control the reaction temperature, reaction time, and concentration of the solute. Therefore, unlike traditional reaction which is used to produce quantum dots with different sizes, we can use microfluidic systems to synthesize uniform quantum dots. When the reaction temperature was controlled from 200-280 ℃, the absorbance peak was found to increase from 481 nm to 538 nm. its corresponding band gap was discovered to decrease from 2.58 eV to 2.3 eV.

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Pinheiro, Ana Catarina Tavares. "Luminescent Glass Materials for Photovoltaics." Master's thesis, 2019. http://hdl.handle.net/10362/89660.

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JIH-HSIN, CHENG, and 鄭日新. "A Study on the Growth of ZnSe and ZnTe Quantum Dots on the Glass and Si Substrate." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/80979765800052749168.

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Lin, Hung-Yuan, and 林鴻源. "Laser Deposition ZnSe Quantum dot Glass Thin Film." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/95702695329813831774.

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碩士
國立交通大學
光電工程研究所
84
ZnSe doped glasses thin films were deposited on silicon and substrate by using of Q-switched Nd:YAG laser, and the targert were prepared by sol-gel methed of colloid chemical technique. From the SEM, we can realize the fine structure of the ZnSe thin film surface and estimate the grain size about 200 A. By changing the deposition condition, we obtain a single crystallite of ZnSe thin film which is identified to be H(002) or C(111) by XRD, and the grain sizecaculation through Half Maximum of XRD peak tch the result of SEM. In the Raman spetra, we make sure the ZnSe bond, and the peak show that the phonon frequency shift to lower side for grain size becaming smaller. The energy gap of ZnSe film is acquired by the Transmission spectra has the phenomonon of blue shift, and this result is corresponding with the prediction of Quantum dot effect.

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Lin, Hong-Yuan, and 林鴻源. "Laser deposition ZnSe quantum dot glass thin films." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/93861374520609226198.

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KUO, JIN-PING, and 郭進平. "Studies on the Electrochemical Behaviors of Caffeic Acid with Carbon Black/Carbon Quantum Dot/Metal Organic Frameworks Modified Glassy Carbon Electrode." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8u857b.

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碩士
輔仁大學
化學系
107
In this study, using nano carbon black/carbon quantum dot (CQD)/metal-organic frameworks (MOFs) modified electrode detecting caffeic acid, and investigating the electrochemical properties of the modified electrode. The metal organic frameworks have been successfully scrutinized by using Fourier transform infrared spectroscopy (FT-IR) and powder X-ray diffraction (PXRD), transmission electron microscopy (TEM) and fluorescence spectrometer successful identify the CQD, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) confirmed that carbon black/carbon quantum dots/metal-organic frameworks modified electrode can be successfully prepared. In these optimal conditions, differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) were used to confirm nano carbon black/carbon quantum dots/metal-organic frameworks modified electrode has excellent electron transfer characteristics, low electron transfer resistance and increase oxidation current signal characteristics. After the optimization process, the electrochemical detection of CA in a wide concentration range, from 0.1 μM to 20 μM concentration range, with the limit of detection (S/N = 3) of 20 nM. In addition, the repeatability of the CB/CQD/MOFs/GCE was measured in the intra-day and inter-day and the relative standard deviation (RSD) was less than 6.93 % and 1.15 %, respectively. Stability remained above 94.52 % after 20 scan by DPV, long-term stability remained above 84.78 %, which confirmed that the modified electrode has good repeatability and stability. Finally, CB/CQD/MOFs/GCE applied in determination of caffeic acid in commercial beverages. The recovery was between 95.01 to 113.14 %, which shows the feasible detection of CA in real sample.

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Частини книг з теми "Quantum dots glass"

Yu, Feng Bin, Fu Yi Chen, and Wan Qi Jie. "Preparation and Characterization of CdS Quantum Dots Doped Phosphate Nanocomposite Glass." In Advances in Composite Materials and Structures, 801–4. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-427-8.801.

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Scamarcio, G. "Raman Scattering in CdS1-x Se x Quantum Dots Embedded in Glass: Evidence of Size-Dependent Lattice Contraction." In Phonons in Semiconductor Nanostructures, 393–401. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1683-1_38.

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Verma, A., P. K. Bhatnagar, P. C. Mathur, S. Nagpal, P. K. Pandey, and J. Kumar. "Development of Low Size Dispersion, High Volume Fraction and Strong Quantum Confined CdS_xSe_1-x Quantum Dots Embedded in Borosilicate Glass Matrix and Study of their Optical Properties." In Semiconductor Photonics: Nano-Structured Materials and Devices, 161–63. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-471-5.161.

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Shukla, Shailendra Kumar. "Solar Distillation Using Quantum Dot Glass Evaporator." In Lecture Notes in Mechanical Engineering, 1–6. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1894-2_1.

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C.A. Silva, Anielle, Jerusa M. de Oliveira, Luciana R.S. Floresta, Matheus V. da Silva, José L. da S. Duarte, Karolina B. da Silva, Eurípedes A. da Silva Filho, et al. "Transition Metals Doped Nanocrystals: Synthesis, Characterization, and Applications." In Transition Metal Compounds - Synthesis, Properties, and Application. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97326.

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Doping is a technique that makes it possible to incorporate substitutional ions into the crystalline structure of materials, generating exciting properties. This book chapter will comment on the transition metals (TM) doped nanocrystals (NCs) and how doping and concentration influence applications and biocompatibility. In the NCs doped with TM, there is a strong interaction of sp-d exchange between the NCs’ charge carriers and the unpaired electrons of the MT, generating new and exciting properties. These doped NCs can be nanopowders or be embedded in glass matrices, depending on the application of interest. Therefore, we show the group results of synthesis, characterization, and applications of iron or copper-doped ZnO nanopowders and chromium-doped Bi2S3, nickel-doped ZnTe, and manganese-doped CdTe quantum dots in the glass matrices.

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Sutton, Adrian P. "Materials by design." In Concepts of Materials Science, 102–13. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192846839.003.0009.

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Materials design brings together the engineering requirements of a material for an application with the science of the relationships between the structure, properties and method of fabrication of the material. It also takes into account the conditions into which the material will be put in service. It is different from materials selection and materials discovery. The concepts of microstructure and materials as complex systems are introduced. An example is given of materials design using a systems approach. Some materials are produced by self-assembly, as illustrated by the bubble raft, photonic crystals and quantum dots. Self-healing materials and self-cleaning glass are two examples of smart materials.

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Kumar, Indradeep. "Simulation and Modeling of Nanotechnology Aircraft Using MATLAB." In Nanotechnology in Aerospace and Structural Mechanics, 257–90. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7921-2.ch008.

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The design methods based on aerospace model have been widely used in aircraft conceptual design for decades and proven very effective when restricted to simple problems with very approximate analyses. These monolithic, large, design and analysis codes are genuinely multidisciplinary, but as analyses become more complex, such codes have grown so large as to be incomprehensible and hence difficult to maintain. This chapter deals with the computational modeling of nanoparticles. Nanomaterials constitute a prominent sub-discipline in the materials and chemical sciences. Conventional materials like glass, ceramic, metals, polymers, or semiconductors can be acquired with nanoscale proportions. Nanomaterials have various microstructural distinctive attributes such as nanodiscs, nanotubes, nanocoatings, quantum dots, nanocomposites, and nanowires. The unique properties of nanoparticle-based materials and devices depend directly on size and structure dependent properties.

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Cristina Vasconcelos, Helena. "Optical Nonlinearities in Glasses." In Nonlinear Optics - Nonlinear Nanophotonics and Novel Materials for Nonlinear Optics. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101774.

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The field of photonics has been the target of constant innovations based on a deep knowledge of the nonlinear optical (NLO) properties of materials and especially on information/data technologies. This chapter compiles some of the main physical aspects needed to understand NLO responses, especially in glasses. Any deviation from the linear correlation between a material’s polarization response and the electric component of an applied electromagnetic field is an example of nonlinear optic behavior. Heavy metal oxide and chalcogenide glasses offer the largest nonlinear response. For example, high refractive index and high dispersion glasses fall in the type of non-resonant devices, while the resonant ones comprise metal nanoparticle doped glasses. Metal nanoparticles’ doped glasses can be pre- pared by the sol-gel method. The optical absorption spectrum of Ag-doped silica glass shows the presence of an absorption band of surface Plasmon Resonance due to Ag nanoparticles at 420 nm and Z-scan has been used to study the NLO properties. This chapter contains a brief discussion of the basic principles of nonlinear optics, the review of the nonlinear optical of glass in general, and two separate sections concerning the nonlinear optical effects in the glasses doped with quantum dots and metals, respectively.

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Massimi, Michela. "Evolving natural kinds." In Perspectival Realism, 304–31. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780197555620.003.0013.

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This chapter elucidates the nature and role of ‘truth-conducive conditionals-supporting inferences’ over time, seeing these inferences as joining the dots among modally robust phenomena and their lawlike dependencies. It is this inferential game that ultimately underpins the Neurathian strategy of NKHF. To illustrate this point, the chapter delves into an example taken from the history of the electron. It reconstructs how J.J. Thomson arrived at the identification of the charge-to-mass ratio for what he called a ‘corpuscle’ working on cathode rays around 1897 and the role of situated epistemic communities including glass-blowers and kelp-makers behind this discovery (Section 10.2). It turns then to a different perspective within which Grotthuss and later Helmholtz and others were studying the phenomenon of electrolysis (Section 10.3). And it briefly examines the influential treatment of the electric charge as a natural unit by Planck and the emerging quantum perspective (Section 10.4). These historical details feed into the philosophical analysis in the rest of the chapter, which returns to the notion of perspectival models as inferential blueprints and modally robust phenomena (Section 10.5). It illustrates how Grotthuss’s chain model and Thomson’s model of the Faraday tubes acted as inferential blueprints to support truth-conducive conditionals-supporting inferences. Section 10.7 zooms into the details of one such chain of conditionals-supporting inferences. The division of modal labour between indicative and subjunctive conditionals described in Chapter 5 is here applied to tease out and exemplify how our knowledge that there is an electric charge is the outcome of epistemic communities across scientific perspectives engaging in an inferential game of asking for reasons as to why any particular grouping of phenomena hangs together.

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Mark, James E., Dale W. Schaefer, and Gui Lin. "Surfaces." In The Polysiloxanes. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780195181739.003.0008.

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Because of the great importance of the surface properties of the polysiloxanes, this topic is treated separately in this chapter. Hydrophobic polysiloxanes having simple aliphatic or aromatic side groups have surfaces that show essentially no attraction to water. In fact, polysiloxanes can serve as water repellants. This property is very useful for applications such as protective coatings on historical monuments and for controlling the surfaces of other polymers, sensors, and quantum dots. Hydrophobic surfaces can be readily regenerated if the surface becomes damaged. Regeneration occurs by rearrangements of the polysiloxane chains so that the hydrophobic methyl groups are once again covering the surface. The flexibility of the siloxane chain backbone facilitates this process. It is also possible to prepare hydrophobic films using methyl-modified siloxane melting gels. Glass surfaces or wool fibers can be coated with polydimethylsiloxane (PDMS) to make them more hydrophobic. In some cases, it is necessary to modify a polysiloxane surface to make it hydrophilic or hydrophobic. Hydrophobization is one aspect of the general topic of modifying and managing the properties of polymer surfaces. An important example involves soft contact lenses that contain PDMS, which is often used because of its very high permeability to oxygen, which is required for metabolic processes within the eye. Such lenses do not feel comfortable however because they do not float properly on the aqueous tears that coat the eye. There are a number of ways to modify the surfaces. There is even a way to make “unreactive” silicones react with inorganic surfaces. In some applications it is useful to have hydrophilicity in the bulk of the polymer instead of just at the surface. One way of doing this is by simultaneously end linking hydrophilic poly(ethylene glycol) (PEG) chains and hydrophobic PDMS chains. Another way is to make a PDMS network with a trifunctional organosilane R’Si(OR) end linker that contains a hydrophilic R’ side chain, such as a polyoxide. Treating only the surfaces is another possibility, for example, by adding hydrophilic brushes by vapor deposition/hydrolysis cycles. Such hydrophilic polysiloxanes can also serve as surfactants.

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Тези доповідей конференцій з теми "Quantum dots glass"

Reisfeld, Renata, Marek Eyal, Valery Chernyak, and Christian K. Jorgensen. "Glasses including quantum dots of cadmium sulfide, silver, and laser dyes." In Submolecular Glass Chemistry and Physics, edited by Phillip Bray and Norbert J. Kreidl. SPIE, 1991. http://dx.doi.org/10.1117/12.50210.

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Peyghambarian, N. "Recent advances in nonlinear semiconductor quantum dots in glass." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.fc.1.

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Esch, V., G. Khitrova, H. M. Gibbs, Xu Jiajin, L. C. Liu, and S. H. Risbud. "Quantum-confined Franz-Keldysh Effect in CdTe Quantum Dots in Glass." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.pd10.

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Microcrystallites of CdTe were grown in a special-formula glass, yielding the first reported CdTe dots (ro ≅ 36Å). As many as six quantum-confinement peaks1 have been seen in the linear absorption spectrum. These quantum dots are especially suited for electric-field effects because of CdTe′s large Bohr radius (aB ≅ 73 Å). The quantum-dots glass sample was arranged in a waveguide configuration with the electric field applied transverse to the light propagation direction. The samples were 200 to 250 µm thick, and measurements were taken at 8 K. Single photon counting enabled measurement of differential signals as small as 10−5. The observed changes in the absorption spectrum are interpreted to arise mainly from a red shift of the lowest transition and the redistribution of the oscillator strength as forbidden transitions are opened up by the symmetry-breaking action of the external field. This interpretation is made plausible by a strong-confinement Franz-Keldysh calculation similar to that of Miller, Chemla, and Schmitt-Rink2 which predicts a differential absorption spectrum in good qualitative agreement with the data. We also report the first nonlinear optical measurements on CdTe quantum dots, observing the differential absorption during 2-µs pump pulses.

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Lipovskii, A. A., I. D. Litvin, A. A. Sitnikova, and S. A. Soloviev. "Synthesis and study of glasses doped with semiconductor quantum dots." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cwf46.

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Glasses doped with microcrystals are interesting both for fundamental study of quantum size phenomena and for applied optics. The last is due to nonlinearity of the glasses,1 lasing,2 and sharp transmission edge. Quantum dots-II-VI microcrystals-arise and grow within a semiconductor-doped glass under annealing. Results on synthesis and characterization of a novel Cd-S-doped phosphate glass (P-glass), a silicate glass (Si-glass) with increased concentration of Cd-S-Se microcrystals, and data on formation and study of ion-exchanged optical waveguides in the Si-glass are presented.

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Justus, B. L., J. A. Ruller, D. McMorrow, and J. S. Melinger. "Femtosecond Nonresonant Nonlinear-optical Response of CuCl Quantum Dots in Glass." In Nonlinear Optics. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/nlo.1992.md7.

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The nonlinear-optical (NLO) properties of semiconductors confined in three dimensions, often called semiconductor quantum dots, have been the subject of intense study. Semiconductor doped glasses can be fabricated which exhibit quantum size effects due to the confinement of the photoexcited carriers by the insulating glass matrix. We have previously reported the fabrication1 of Cu(I)Cl quantum dots in a borosilicate glass matrix with radii ranging from 20Å to 35 Å and the measurement2 of the third order nonlinearity of the CuCl quantum dots due to saturation of the excitonic absorption at 380 nm. The CuCl quantum dots exhibit an extremely large, size dependent, nonlinearity at resonance. In this paper we report the femtosecond dynamics of the third order NLO response of CuCl quantum dots in borosilicate glass measured in a transparent region of the glass far from resonance. The measurements were performed with 90 femtosecond time resolution (60 fsec pulses) using a four wave mixing configuration which is capable of separating the electronic and nuclear contributions to the NLO susceptibility3.

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Jacob, G. J., D. B. Almeida, W. M. Faustino, E. F. Chillcce, E. Rodriguez, C. H. Brito Cruz, L. C. Barbosa, and C. L. Cesar. "PbTe quantum dots in tellurite glass microstructured optical fiber." In Integrated Optoelectronic Devices 2008, edited by Kurt G. Eyink, Frank Szmulowicz, and Diana L. Huffaker. SPIE, 2008. http://dx.doi.org/10.1117/12.761563.

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Jacob, G. J., E. Rodriguez, E. F. Chillcce, W. Faustino, W. L. Moreira, C. H. Brito, L. C. Barbosa, and C. L. Cesar. "PbTe quantum dots in tellurite glass photonic optical fiber." In Photonic Crystal Materials and Devices VI. SPIE, 2007. http://dx.doi.org/10.1117/12.701227.

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Jacob, Gilberto J., Luiz C. Barbosa, and Carlos L. Cesar. "Tellurite glass optical fiber doped with PbTe quantum dots." In Integrated Optoelectronic Devices 2005, edited by Diana L. Huffaker and Pallab K. Bhattacharya. SPIE, 2005. http://dx.doi.org/10.1117/12.587248.

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Bhardwaj, A., A. Hreibi, C. Liu, J. Heo, J. L. Auguste, J. M. Blondy, and F. Gérôme. "PbS quantum dots doped glass fibers for optical applications." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/cleo_si.2012.cth1g.1.

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Oreshkina, K., V. Dubrovin, Y. Sgibnev, N. Nikonorov, A. Babkina, E. Kulpina, and K. Zyryanova. "Luminescent Glass with Lead Perovskite Quantum Dots for Solar Concentrators." In 2020 International Conference Laser Optics (ICLO). IEEE, 2020. http://dx.doi.org/10.1109/iclo48556.2020.9285792.

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