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Artykuły w czasopismach na temat „Silicon Doped Polymers”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Švrček, Vladimir. "Nanocrystalline silicon and carbon nanotube nanocomposites prepared by pulsed laser fragmentation". Pure and Applied Chemistry 80, nr 11 (1.01.2008): 2513–20. http://dx.doi.org/10.1351/pac200880112513.

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This paper outlines the synthesis of nanocrystalline silicon (nc-Si) by nanosecond pulsed laser fragmentation of Si micrograins in liquid solutions, and characterization of the products. We compare micrograin fragmentations in deionized water, and in undoped and phosphorus-doped ethylpolysilicate (C2H5O[SiO(C2H5O)2]n C2H5) based polymers. We show that dissolution and subsequent laser fragmentation of micrograins is more efficient in both polymeric media than in water. In the case of water, micrograin surface wetting by ethanol prior to introduction into water is essential to achieve fragmentation. Prepared nc-Si/polymer nanocomposites display visible photoluminescence (PL) (~430 nm) at room temperature. The phosphorus polymer induces a blue shift of the PL peak. In addition, induced shock waves generated at sufficiently high laser irradiation intensities (>4.3 mJ/pulse) cause carbon nanotube (CNT) cavities to be filled by freshly prepared luminescent nc-Si/polymer nanocomposite.

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2

Epstein, Arthur J. "Electrically Conducting Polymers: Science and Technology". MRS Bulletin 22, nr 6 (czerwiec 1997): 16–23. http://dx.doi.org/10.1557/s0883769400033583.

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For the past 50 years, conventional insulating-polymer systems have increasingly been used as substitutes for structural materials such as wood, ceramics, and metals because of their high strength, light weight, ease of chemical modification/customization, and processability at low temperatures. In 1977 the first intrinsic electrically conducting organic polymer—doped polyacetylene—was reported, spurring interest in “conducting polymers.” Intrinsically conducting polymers are completely different from conducting polymers that are merely a physical mixture of a nonconductive polymer with a conducting material such as metal or carbon powder. Although initially these intrinsically conducting polymers were neither processable nor air-stable, new generations of these materials now are processable into powders, films, and fibers from a wide variety of solvents, and also are airstable. Some forms of these intrinsically conducting polymers can be blended into traditional polymers to form electrically conductive blends. The electrical conductivities of the intrinsically conductingpolymer systems now range from those typical of insulators (<10−10 S/cm (10−10 Ω−1 cm1)) to those typical of semiconductors such as silicon (~10 5 S/cm) to those greater than 10+4 S/cm (nearly that of a good metal such as copper, 5 × 105 S/cm). Applications of these polymers, especially polyanilines, have begun to emerge. These include coatings and blends for electrostatic dissipation and electromagnetic-interference (EMI) shielding, electromagnetic-radiation absorbers for welding (joining) of plastics, conductive layers for light-emitting polymer devices, and anticorrosion coatings for iron and steel.The common electronic feature of pris tine (undoped) conducting polymers is the π-conjugated system, which is formed by the overlap of carbon pz orbitals and alternating carbon-carbon bond lengths.

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3

Wu, Yu, Xiaodong Wang, Lin Liu, Ze Zhang i Jun Shen. "Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation". Gels 7, nr 3 (14.08.2021): 122. http://dx.doi.org/10.3390/gels7030122.

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In this study, we used two methods to prepare alumina-doped silica aerogels with the aim of increasing the thermal stability of silica aerogels. The first method was physical doping of α-Al2O3 nano powders, and the second method was to create a chemical compound via the co-precursor of TEOS and AlCl3·6H2O in different proportions. The shrinkage, chemical composition, and specific surface area (SSA) of samples after heating at different temperatures were analyzed. Our results show that the silicon hydroxyl groups of samples derived from AlCl3·6H2O gradually decreased and nearly disappeared after heating at 800 °C, which indicates the complete dehydration of the silicon hydroxyl. Thus, the samples exhibited a large linear shrinkage and decreased SSA after high-temperature heat treatment. By contrast, samples doped with α-Al2O3 powders retained abundant silicon hydroxyl groups, and the 6.1 wt.% α-Al2O3-doped sample exhibited the lowest linear shrinkage of 11% and the highest SSA of 1056 m2/g after heat treatment at 800 °C. The alumina-doped silica aerogels prepared using a simple and low-price synthesized method pave the way for the low-cost and large-scale production of high-temperature thermal insulation.

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4

Wong, Terence K. S., i Keyi Pei. "Double Heterojunction Crystalline Silicon Solar Cells: From Doped Silicon to Dopant-Free Passivating Contacts". Photonics 9, nr 7 (8.07.2022): 477. http://dx.doi.org/10.3390/photonics9070477.

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Carrier-selective passivating contacts for effective electron and hole extraction are crucial to the attainment of high efficiency in crystalline silicon (Si) solar cells. In this comprehensive review, the principle of carrier extraction and recombination mechanisms in conventional industrial Si solar cells are discussed first. Passivating contacts based on (i) amorphous hydrogenated Si and (ii) polysilicon/silicon oxide are next reviewed, with emphasis on carrier selectivity mechanisms including contact layer band alignment with silicon, and localized carrier transport in ultrathin oxides. More recent developments in dopant-free passivating contacts deposited by lower-cost fabrication processes with lower thermal budget are then described. This third category of non-Si based electron- and hole-selective passivating contacts include transition metal oxides, alkali/alkali earth metal fluorides and organic conjugated polymers. The photovoltaic performance of asymmetric double heterojunction Si solar cells fabricated using these non-Si passivating contacts and their stability in damp heat conditions are discussed and compared with Si based passivating contacts.

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5

Kim, Yong-il, Hyunsook Kim i Haiwon Lee. "Effect of Solvent and Dopant on Poly(3,4-ethylenedioxythiophene) Thin Films by Atomic Force Microscope Lithography". Journal of Nanoscience and Nanotechnology 8, nr 9 (1.09.2008): 4757–60. http://dx.doi.org/10.1166/jnn.2008.ic06.

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AMF anodization lithography was performed on organic thin films with conducting polymers which is poly(3,4-ethylenedioxythiophene). The conductivity of PEDOT thin films was changed by different dopants and organic solvents. Two different dopants are poly(4-styrenesulfonate) and di(2-ethylhexyl)-sulfosuccinate. Also, DMF and IPA were used to prepare the PEDOT thin films doped with PSS and DEHS on silicon surface. The conductivities of these PEDOT variants were compared by obtaining their I–V curves between tip and thin films using AFM. Silicon oxide nanopatterns with higher aspect ratios can be obtained from the films with higher conductivity.

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6

Ressler, Antonia, Leonard Bauer, Teodora Prebeg, Maja Ledinski, Irina Hussainova, Inga Urlić, Marica Ivanković i Hrvoje Ivanković. "PCL/Si-Doped Multi-Phase Calcium Phosphate Scaffolds Derived from Cuttlefish Bone". Materials 15, nr 9 (6.05.2022): 3348. http://dx.doi.org/10.3390/ma15093348.

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Increasing attention is focused on developing biomaterials as temporary scaffolds that provide a specific environment and microstructure for bone tissue regeneration. The aim of the present work was to synthesize silicon-doped biomimetic multi-phase composite scaffolds based on bioactive inorganic phases and biocompatible polymers (poly(ε-caprolactone), PCL) using simple and inexpensive methods. Porous multi-phase composite scaffolds from cuttlefish bone were synthesized using a hydrothermal method and were further impregnated with (3-aminopropyl)triethoxysilane 1–4 times, heat-treated (1000 °C) and coated with PCL. The effect of silicon doping and the PCL coating on the microstructure and mechanical and biological properties of the scaffolds has been investigated. Multi-phase scaffolds based on calcium phosphate (hydroxyapatite, α-tricalcium phosphate, β-tricalcium phosphate) and calcium silicate (wollastonite, larnite, dicalcium silicate) phases were obtained. Elemental mapping revealed homogeneously dispersed silicon throughout the scaffolds, whereas silicon doping increased bovine serum albumin protein adsorption. The highly porous structure of cuttlefish bone was preserved with a composite scaffold porosity of ~78%. A compressive strength of ~1.4 MPa makes the obtained composite scaffolds appropriate for non-load-bearing applications. Cytocompatibility assessment by an MTT assay of human mesenchymal stem cells revealed the non-cytotoxicity of the obtained scaffolds.

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7

Kim, Jong Seok, Yeong Min Park, Jeong Wan Kim, Kelimu Tulugan i Tae Gyu Kim. "Characteristics of deposited boron doping diamond on tungsten carbide insert by MPECVD". Modern Physics Letters B 29, nr 06n07 (20.03.2015): 1540048. http://dx.doi.org/10.1142/s0217984915400485.

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Diamond-coated cutting tools are used primarily for machining non-ferrous materials such as aluminum–silicon alloys, copper alloys, fiber-reinforced polymers, green ceramics and graphite. Because the tool life of cemented carbide cutting tool is greatly improved by diamond coating, and typically more than 10 times of the tool life is obtained. However, research of boron-doped diamond (BDD) coating tool has not been fully researched yet. In this study, we have succeeded to make boron-doped microcrystalline and nanocrystalline diamond-coated Co -cemented tungsten carbide (WC– Co ) inserts. Microcrystalline BDD thin film is deposited on WC– Co insert by using microwave plasma enhanced chemical vapor deposition (MPECVD) method. Scanning electron microscope (SEM) and Raman spectroscopy are used to characterize the as-deposited diamond films.1,2

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8

Greulich-Weber, Siegmund, M. Zöller i B. Friedel. "Textile Solar Cells Based on SiC Microwires". Materials Science Forum 615-617 (marzec 2009): 239–42. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.239.

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The solar cell concept presented here is based on 3C-SiC nano- or microwires and conju¬gated polymers. Therefore the silicon carbide wires are fabricated by a sol-gel route including a car-bothermal reduction step, allowing growth with predetermined uniform diameters between 0.1 and 2μm and lengths up to several centimetres. The design of our photovoltaic device is therein based on a p-i-n structure, well known e.g. from silicon photovoltaics, involving an intrinsic semiconduc¬tor as the central photoactive layer, sandwiched between two complementary doped wide-bandgap semiconductors giving the driving force for charge separation. In our case the 3C-SiC microwires act as the electron acceptor and simultaneously as carrier material for all involved components of the photovoltaic element.

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9

Liu, Zhigao, Jinchi Xu, Si Cheng, Zhiyong Qin i Yunlin Fu. "Photocatalytic Performance and Kinetic Studies of a Wood Surface Loaded with Bi2O3-Doped Silicon–Titanium Composite Film". Polymers 15, nr 1 (21.12.2022): 25. http://dx.doi.org/10.3390/polym15010025.

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In this paper, a surface self-cleaning wood was obtained by loading Bi2O3-doped silica–titanium composite film on the surface of wood by the sol–gel method. The effects of different Bi doping amounts on the structure and photocatalytic properties of the modified wood were investigated. The doping of Bi2O3 inhibited the growth of TiO2 crystals and the phase transition from anatase to rutile. In addition, Bi2O3 could improve the photocatalytic activity of the composite film by appropriately reducing the grain size of TiO2 and increasing the crystallinity of TiO2. Furthermore, doping with Bi2O3 shifted the absorption wavelength of the wood samples back into the visible range, indicating that the increase in Bi content favoured light absorption. The wood samples loaded with Bi2O3-doped Si–Ti composite membranes had the best photocatalytic activity and the highest reaction rate when n (Ti):n (Bi) = 1:0.015. Degradation rates of 96.0% and 94.0% could be achieved for rhodamine B and gaseous formaldehyde, respectively. It can be seen that wood samples loaded with Bi2O3-doped Si–Ti composite films on the surface exhibit excellent photocatalytic activity against both gaseous and liquid pollutants.

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10

Tsai, Pei-Ting, Ming-Chin Li, Yi-Chun Lai, Wei-Hsuan Tseng, Chih-I. Wu, Si-Han Chen, Yi-Cheng Lin i in. "Solution p-doped fluorescent polymers for enhanced charge transport of hybrid organic-silicon nanowire photovoltaics". Organic Electronics 34 (lipiec 2016): 246–53. http://dx.doi.org/10.1016/j.orgel.2016.04.005.

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11

Gao, Fei, Xinyu Zhao i Jinglin Liu. "A Facile Method for the Fabrication of Luminescent Eu3+-Doped SiO2 Nanowires". Gels 8, nr 5 (6.05.2022): 286. http://dx.doi.org/10.3390/gels8050286.

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Europium trivalent ion (Eu3+)-doped silica nanowires were prepared, and the positioning of Eu3+ in the silicon dioxide nanowire matrix was researched. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction analysis (XRD) and energy-dispersive X-ray spectroscope analysis (EDX) were used to characterize the product’s morphology and structure. The representation of Fourier transform infrared spectra (FT-IR) and X-ray photoelectron spectroscopy (XPS) were indicative of the presence of a covalent Eu-O-Si bond. The results suggest that Eu3+ was successfully doped into amorphous silica. Furthermore, a sol-gel inorganic−organic co-assembly mechanism model was proposed to illuminate the formation of the rare-earth ion-doped nanowires. In addition, photoluminescent emission of europium ions in a silica matrix was further discussed. It was demonstrated that a 10% content of Eu3+ resulted in a quenching effect and after annealing at 650 °C, the europium ions in the nanowires had a high luminescence intensity due to the silica network structure.

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12

Hojatkashani, Leila. "Theoretical Investigation of Application of Combining Pristine C60 and doped C60 with Silicon and Germanium atoms for Solar cells ; A DFT Study". Oriental Journal of Chemistry 35, nr 1 (21.02.2019): 255–63. http://dx.doi.org/10.13005/ojc/350130.

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Solar energy and its conversion to electricity is an important research in the last decade. Solar cells are consist of a p-type semiconductor as donor and an n-type semiconductor as acceptor. Organic polymers as organic semiconductors are used in an organic solar cell. This research is a theoretical investigation of fullerene C60 as donor and C60 doped derivatives with Silicon and Germanium atoms as acceptors for basic structure of a solar cell. This research is done not only with using related equations but also with investigating theoretical UV-VIS spectrum of the chosen donors-acceptors and their absorption wavelengths, oscillator strength and maximum coefficient absorptions of these solar cells.

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13

Pulici, Andrea, Stefano Kuschlan, Gabriele Seguini, Fabiana Taglietti, Marco Fanciulli, Riccardo Chiarcos, Michele Laus i Michele Perego. "Electrical characterization of thin silicon-on-insulator films doped by means of phosphorus end-terminated polymers". Materials Science in Semiconductor Processing 163 (sierpień 2023): 107548. http://dx.doi.org/10.1016/j.mssp.2023.107548.

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14

UCHAIKIN, VLADIMIR V., i RENAT T. SIBATOV. "ANOMALOUS KINETICS OF CHARGE CARRIERS IN DISORDERED SOLIDS: FRACTIONAL DERIVATIVE APPROACH". International Journal of Modern Physics B 26, nr 31 (4.12.2012): 1230016. http://dx.doi.org/10.1142/s0217979212300162.

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Anomalous (non-Gaussian) kinetics is often observed in various disordered materials, such as amorphous semiconductors, porous solids, polycrystalline films, liquid-crystalline materials, polymers, etc. Recently the anomalous relaxation-diffusion processes have been observed in nanoscale systems: nanoporous silicon, glasses doped by quantum dots, quasi-one-dimensional (1D) systems, arrays of colloidal quantum dots, and some others. The paper presents a review of new approach, based on fractional kinetic equations. We give a physical basis for some fractional equations deriving them from their classical counterparts by means of averaging over statistical ensemble of disordered media. We consider self-similarity as the main feature of these processes, and explain memory phenomena in frameworks of hidden variables conception.

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15

Zhang, Bingwen, Jun Wang, Ziyang Hu i Aifeng Ning. "Electronic and geometric stability of double titanium-doped silicon clusters". Materials Research Express 7, nr 8 (13.08.2020): 085006. http://dx.doi.org/10.1088/2053-1591/ababbf.

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16

Han, Ming-Chao, Shun-Zhong Cai, Ji Wang i Hong-Wei He. "Single-Side Superhydrophobicity in Si3N4-Doped and SiO2-Treated Polypropylene Nonwoven Webs with Antibacterial Activity". Polymers 14, nr 14 (21.07.2022): 2952. http://dx.doi.org/10.3390/polym14142952.

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Meltblown (MB) nonwovens as air filter materials have played an important role in protecting people from microbe infection in the COVID-19 pandemic. As the pandemic enters the third year in this current global event, it becomes more and more beneficial to develop more functional MB nonwovens with special surface selectivity as well as antibacterial activities. In this article, an antibacterial polypropylene MB nonwoven doped with nano silicon nitride (Si3N4), one of ceramic materials, was developed. With the introduction of Si3N4, both the average diameter of the fibers and the pore diameter and porosity of the nonwovens can be tailored. Moreover, the nonwovens having a single-side moisture transportation, which would be more comfortable in use for respirators or masks, was designed by imparting a hydrophobicity gradient through the single-side superhydrophobic finishing of reactive organic/inorganic silicon coprecipitation in situ. After a nano/micro structural SiO2 precipitation on one side of the fabric surfaces, the contact angles were up to 161.7° from 141.0° originally. The nonwovens were evaluated on antibacterial activity, the result of which indicated that they had a high antibacterial activity when the dosage of Si3N4 was 0.6 wt%. The bacteriostatic rate against E. coli and S. aureus was up to over 96%. Due to the nontoxicity and excellent antibacterial activity of Si3N4, this MB nonwovens are promising as a high-efficiency air filter material, particularly during the pandemic.

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17

Galaup, J. P. "Spectral Hole Burning and Photophysics in Dye-Doped Solids: A Comparison between Polymers and Silicon-Based Xerogels". Optics and Spectroscopy 98, nr 5 (2005): 661. http://dx.doi.org/10.1134/1.1929050.

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18

Toledano-Osorio, Manuel, Francisco J. Manzano-Moreno, Manuel Toledano, Antonio L. Medina-Castillo, Victor J. Costela-Ruiz, Concepción Ruiz i Raquel Osorio. "Doxycycline-Doped Polymeric Membranes Induced Growth, Differentiation and Expression of Antigenic Phenotype Markers of Osteoblasts". Polymers 13, nr 7 (28.03.2021): 1063. http://dx.doi.org/10.3390/polym13071063.

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Polymeric membranes are employed in guided bone regeneration (GBR) as physical barriers to facilitate bone in-growth. A bioactive and biomimetic membrane with the ability to participate in the healing and regeneration of the bone is necessary. The aim of the present study was to analyze how novel silicon dioxide composite membranes functionalized with zinc or doxycycline can modulate the osteoblasts’ proliferation, differentiation, and expression of selected antigenic markers related to immunomodulation. Nanostructured acrylate-based membranes were developed, blended with silica, and functionalized with zinc or doxycycline. They were subjected to MG63 osteoblast-like cells culturing. Proliferation was assessed by MTT-assay, differentiation by evaluating the alkaline phosphatase activity by a spectrophotometric method and antigenic phenotype was assessed by flow cytometry for selected markers. Mean comparisons were conducted by one-way ANOVA and Tukey tests (p < 0.05). The blending of silica nanoparticles in the tested non-resorbable polymeric scaffold improved the proliferation and differentiation of osteoblasts, but doxycycline doped scaffolds attained the best results. Osteoblasts cultured on doxycycline functionalized membranes presented higher expression of CD54, CD80, CD86, and HLA-DR, indicating a beneficial immunomodulation activity. Doxycycline doped membranes may be a potential candidate for use in GBR procedures in several challenging pathologies, including periodontal disease.

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19

Kim, Jae Yong, Shahzad Iqbal, Hyo Jun Jang, Eun Young Jung, Gyu Tae Bae, Choon-Sang Park i Heung-Sik Tae. "In-Situ Iodine Doping Characteristics of Conductive Polyaniline Film Polymerized by Low-Voltage-Driven Atmospheric Pressure Plasma". Polymers 13, nr 3 (28.01.2021): 418. http://dx.doi.org/10.3390/polym13030418.

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In-situ iodine (I2)-doped atmospheric pressure (AP) plasma polymerization is proposed, based on a newly designed AP plasma reactor with a single wire electrode that enables low-voltage-driven plasma polymerization. The proposed AP plasma reactor can proceed plasma polymerization at low voltage levels, thereby enabling an effective in-situ I2 doping process by maintaining a stable glow discharge state even if the applied voltage increases due to the use of a discharge gas containing a large amount of monomer vapors and doping materials. The results of field-emission scanning electron microscopy (FE-SEM) and Fourier transformation infrared spectroscopy (FT-IR) show that the polyaniline (PANI) films are successfully deposited on the silicon (Si) substrates, and that the crosslinking pattern of the synthesized nanoparticles is predominantly vertically aligned. In addition, the in-situ I2-doped PANI film fabricated by the proposed AP plasma reactor exhibits excellent electrical resistance without electrical aging behavior. The developed AP plasma reactor proposed in this study is more advantageous for the polymerization and in-situ I2 doping of conductive polymer films than the existing AP plasma reactor with a dielectric barrier.

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20

Anton, Ronja, Vito Leisner, Philipp Watermeyer, Michael Engstler i Uwe Schulz. "Hafnia-doped silicon bond coats manufactured by PVD for SiC/SiC CMCs". Acta Materialia 183 (styczeń 2020): 471–83. http://dx.doi.org/10.1016/j.actamat.2019.10.050.

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21

Itsh’ak, Azoulay, Ory Klonsky, Yaniv Gelbstein i Peter Beker. "Doping type influence on physical diamond properties". Materials Research Express 9, nr 2 (1.02.2022): 025901. http://dx.doi.org/10.1088/2053-1591/ac4eb8.

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Abstract Diamond exhibits outstanding properties that make it a material of interest for the semiconductors industry. The industry required a silicon alternative that enabled devices to be smaller, cooler, faster, more powerful and cleaner. Diamond exhibit a large energy band gap that needs to be doped in order to observe any significant electrical conductivity. The purpose of this work is to compare the electrical properties of intrinsic and doped diamond based materials by impedance spectroscopy, I-V measurements and thermal conductivity measurements. The results of impedance measurement of the real and imaginary parts were presented in the form of a Nyquist and dielectric permittivity curves. In order to interpret the observed response, a resistor–capacitor circuit model was used for physical mechanisms interpretation. Direct evidence for the doping influence on the diamond, was obtained by I-V measurements. We describe Raman spectroscopy based method of measuring thermal conductivity of diamond doped samples, and review results achieved by line width correlation technique.

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22

Ain, Qura Tul, Abeer Al-Modlej, Abeer Alshammari i Muhammad Naeem Anjum. "Effect of solvents on optical band gap of silicon-doped graphene oxide". Materials Research Express 5, nr 3 (9.03.2018): 035017. http://dx.doi.org/10.1088/2053-1591/aab239.

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23

Li, Zhe, Yan Zhang, Hao Peng, Lu Liu, Weiming Zhu i Zhijun Liu. "Spectral narrowing of sub-bandgap absorbance and emissivity in highly doped silicon". Materials Research Express 6, nr 12 (6.01.2020): 126212. http://dx.doi.org/10.1088/2053-1591/ab637d.

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Abdul Hamid, Siti Nor Fazlina, Nurul Aqidah Mohd Sinin, Zon Fazlila Mohd Ahir, Suhaila Sepeai, Kamaruzzaman Sopian i Saleem H Zaidi. "Electrical investigation of ITO films in Al-doped crystalline silicon solar cells". Materials Research Express 7, nr 1 (21.01.2020): 015917. http://dx.doi.org/10.1088/2053-1591/ab689f.

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Wang, Fan, Shouzhi Zhang, Jiawei Zhang, Manshu Han, Guoxiang Pan i Minghua Chen. "Rational synthesis of silicon into polyimide-derived hollow electrospun carbon nanofibers for enhanced lithium storage". e-Polymers 20, nr 1 (21.09.2020): 491–99. http://dx.doi.org/10.1515/epoly-2020-0023.

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AbstractFlexible energy devices with high energy density and long cycle life are considered to be promising applications in portable electronics. In this study, silicon/carbon nanofiber (Si@CNF) core–shell electrode has been prepared by the coaxial electrospinning method. The precursors of polyimide (PI) were for the first time used to form the core–shell structure of Si@CNF, which depicts outstanding flexibility and mechanical strength. The effect of doping concentrations of silicon (Si) nanoparticles embedded in the fiber is investigated as a binder-free anode for lithium-ion batteries. A 15 wt% doped composite electrode demonstrates superior performance, with an initial reversible capacity of 621 mA h g−1 at the current density of 100 mA g−1 and a high capacity retention up to 200 cycles. The excellent cycling performance is mainly due to the carbonized PI core–shell structure, which not only can compensate for the insulation property of Si but also has the ability to buffer the volume expansion during the repeated charge–discharge process.

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26

Grech, David, Antulio Tarazona, Maria Theresa De Leon, Kian S. Kiang, Jurgita Zekonyte, Robert J. K. Wood i Harold M. H. Chong. "Large gauge factor of hot wire chemical vapour depositionin-situboron doped polycrystalline silicon". Materials Research Express 3, nr 4 (20.04.2016): 045702. http://dx.doi.org/10.1088/2053-1591/3/4/045702.

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Cuevas, A., B. B. Campos, R. Romero, M. Algarra, Mª I. Vázquez i J. Benavente. "Eco-friendly modification of a regenerated cellulose based film by silicon, carbon and N-doped carbon quantum dots". Carbohydrate Polymers 206 (luty 2019): 238–44. http://dx.doi.org/10.1016/j.carbpol.2018.10.074.

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Lashkovskaya, Ekaterina I., Nikolai V. Gaponenko, Margarita V. Stepikhova, Artem N. Yablonskiy, Boris A. Andreev, Vadim D. Zhivulko, Alexander V. Mudryi i in. "Optical Properties and Upconversion Luminescence of BaTiO3 Xerogel Structures Doped with Erbium and Ytterbium". Gels 8, nr 6 (2.06.2022): 347. http://dx.doi.org/10.3390/gels8060347.

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Erbium upconversion (UC) photoluminescence (PL) from sol-gel derived barium titanate (BaTiO3:Er) xerogel structures fabricated on silicon, glass or fused silica substrates has been studied. Under continuous-wave excitation at 980 nm and nanosecond pulsed excitation at 980 and 1540 nm, the fabricated structures demonstrate room temperature PL with several bands at 410, 523, 546, 658, 800 and 830 nm, corresponding to the 2H9/2 → 4I15/2, 2H11/2 → 4I15/2, 4S3/2 → 4I15/2, 4F9/2→ 4I15/2 and 4I9/2→ 4I15/2 transitions of Er3+ ions. The intensity of erbium UC PL increases when an additional macroporous layer of strontium titanate is used beneath the BaTiO3 xerogel layer. It is also enhanced in BaTiO3 xerogel films codoped with erbium and ytterbium (BaTiO3:(Er,Yb)). For the latter, a redistribution of the intensity of the PL bands is observed depending on the excitation conditions. A multilayer BaTiO3:(Er,Yb)/SiO2 microcavity structure was formed on a fused silica substrate with a cavity mode in the range of 650–680 nm corresponding to one of the UC PL bands of Er3+ ions. The obtained cavity structure annealed at 450 °C provides tuning of the cavity mode by 10 nm in the temperature range from 20 °C to 130 °C. Photonic application of BaTiO3 xerogel structures doped with lanthanides is discussed.

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Zhou, Dayu, Yan Guan, Melvin M. Vopson, Jin Xu, Hailong Liang, Fei Cao, Xianlin Dong, Johannes Mueller, Tony Schenk i Uwe Schroeder. "Electric field and temperature scaling of polarization reversal in silicon doped hafnium oxide ferroelectric thin films". Acta Materialia 99 (październik 2015): 240–46. http://dx.doi.org/10.1016/j.actamat.2015.07.035.

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Morosanova, Maria A., i Elena I. Morosanova. "Sol-Gel Films Doped with Enzymes and Banana Crude Extract as Sensing Materials for Spectrophotometric Determination". Gels 9, nr 3 (18.03.2023): 240. http://dx.doi.org/10.3390/gels9030240.

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Chromogenic enzymatic reactions are very convenient for the determination of various biochemically active compounds. Sol-gel films are a promising platform for biosensor development. The creation of sol-gel films with immobilized enzymes deserves attention as an effective way to create optical biosensors. In the present work, the conditions are selected to obtain sol-gel films doped with horseradish peroxidase (HRP), mushroom tyrosinase (MT) and crude banana extract (BE), inside the polystyrene spectrophotometric cuvettes. Two procedures are proposed: the use of tetraethoxysilane-phenyltriethoxysilane (TEOS-PhTEOS) mixture as precursor, as well as the use of silicon polyethylene glycol (SPG).In both types of films, the enzymatic activity of HRP, MT, and BE is preserved. Based on the kinetics study of enzymatic reactions catalyzed by sol-gel films doped with HRP, MT, and BE, we found that encapsulation in the TEOS-PhTEOS films affects the enzymatic activity to a lesser extent compared to encapsulation in SPG films. Immobilization affects BE significantly less than MT and HRP. The Michaelis constant for BE encapsulated in TEOS-PhTEOS films almost does not differ from the Michaelis constant for a non-immobilized BE. The proposed sol-gel films allow determining hydrogen peroxide in the range of 0.2–3.5 mM (HRP containing film in the presence of TMB), and caffeic acid in the ranges of 0.5–10.0 mM and 2.0–10.0 mM (MT- and BE-containing films, respectively). BE-containing films have been used to determine the total polyphenol content of coffee in caffeic acid equivalents; the results of the analysis are in good agreement with the results obtained using an independent method of determination. These films are highly stable and can be stored without the loss of activity for 2 months at +4 °C and 2 weeks at +25 °C.

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Li, Quan, i Xiaowei Yin. "Effects of Phase Composition on Microstructure and Mechanical Properties of Lu2O3-doped Porous Silicon Nitride Ceramics". Journal of Materials Science & Technology 27, nr 6 (styczeń 2011): 529–33. http://dx.doi.org/10.1016/s1005-0302(11)60103-5.

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Xue, Runping, Jianzhao Mao, Hong Zhao, Chen Yang, Huihui Gao, Jianjun Xu i Mengjin Jiang. "Effect of nano silicon dioxide on the structure and properties of FeCl 3 ‐doped polyvinyl alcohol photopolymer film". Journal of Applied Polymer Science 136, nr 26 (4.03.2019): 47702. http://dx.doi.org/10.1002/app.47702.

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Biswas, S., M. K. Basher, M. Khalid Hossain, M. A. R. Akand, M. T. Rahman, M. R. Ahmed, M. A. Matin i S. Huque. "Study and analysis of the morphological, elemental and electrical properties of phosphorus doped monocrystalline silicon solar cell". Materials Research Express 6, nr 5 (22.02.2019): 055515. http://dx.doi.org/10.1088/2053-1591/ab070b.

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Acarer, Seren, İnci Pir, Mertol Tüfekci, Güler Türkoğlu Demirkol i Neşe Tüfekci. "Manufacturing and Characterisation of Polymeric Membranes for Water Treatment and Numerical Investigation of Mechanics of Nanocomposite Membranes". Polymers 13, nr 10 (20.05.2021): 1661. http://dx.doi.org/10.3390/polym13101661.

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In this study, polyethersulfone (PES) and polyvinylidene fluoride (PVDF) microfiltration membranes containing polyvinylpyrrolidone (PVP) with and without support layers of 130 and 150 μm thickness are manufactured using the phase inversion method and then experimentally characterised. For the characterisation of membranes, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and pore size analysis are performed, the contact angle and water content of membranes are measured and the tensile test is applied to membranes without support layers. Using the results obtained from the tensile tests, the mechanical properties of the halloysite nanotube (HNT) and nano-silicon dioxide (nano SiO2) reinforced nanocomposite membranes are approximately determined by the Mori–Tanaka homogenisation method without applying any further mechanical tests. Then, plain polymeric and PES and PVDF based nanocomposite membranes are modelled using the finite element method to determine the effect of the geometry of the membrane on the mechanical behaviour for fifteen different geometries. The modelled membranes compared in terms of three different criteria: equivalent stress (von Mises), displacement, and in-plane principal strain. Based on the data obtained from the characterisation part of the study and the numerical analysis, the membrane with the best performance is determined. The most appropriate shape and material for a membrane for water treatment is specified as a 1% HNT doped PVDF based elliptical membrane.

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Liu, Xiaohua, Dayu Zhou, Yan Guan, Shuaidong Li, Fei Cao i Xianlin Dong. "Endurance properties of silicon-doped hafnium oxide ferroelectric and antiferroelectric-like thin films: A comparative study and prediction". Acta Materialia 154 (sierpień 2018): 190–98. http://dx.doi.org/10.1016/j.actamat.2018.05.033.

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Pattnaik, A., S. Jha, M. Tomar, V. Gupta, B. Prasad i S. Mondal. "Improving the quantum efficiency of the monocrystalline silicon solar cell using erbium-doped zinc sulphide nanophosphor in downshift layer". Materials Research Express 5, nr 9 (8.08.2018): 095014. http://dx.doi.org/10.1088/2053-1591/aad602.

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Bose, Sukanta, Sourav Mandal, Asok K. Barua i Sumita Mukhopadhyay. "Properties of boron doped ZnO films prepared by reactive sputtering method: Application to amorphous silicon thin film solar cells". Journal of Materials Science & Technology 55 (październik 2020): 136–43. http://dx.doi.org/10.1016/j.jmst.2019.12.004.

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Cao, Jun, Jianhong Gao, Kun Wang, Zhuoying Wu, Xinxin Zhu, Han Li, Min Ling, Chengdu Liang i Jun Chen. "Constructing globally consecutive 3D conductive network using P-doped biochar cotton fiber for superior performance of silicon-based anodes". Journal of Materials Science & Technology 173 (luty 2024): 181–91. http://dx.doi.org/10.1016/j.jmst.2023.07.026.

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CISZEWSKA, MONIKA, i JANUSZ PLOCHARSKI. "ELECTRORHEOLOGICAL EFFECT OF CONDUCTIVE POLYMERS DISPERSED IN LIQUID CRYSTALLINE MATRIX". International Journal of Modern Physics B 19, nr 07n09 (10.04.2005): 1135–41. http://dx.doi.org/10.1142/s0217979205029973.

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Hybrid electrorheological fluids comprising powdered conjugated polymers dispersed in solutions of a liquid crystalline polymer were prepared and studied. FeCl 3 doped poly(p-phenylene) and pyrolised polyacrylonitrile were chosen as the dispersed phase and poly(n-hexyl isocyanate) dissolved in xylene was used as the active liquid matrix. All the component materials were extensively characterized by various methods. Flow curves of the hybrid ER fluids were recorded under electric field and compared with analogous curves obtained for dispersions of the powders in silicone oil and with homogeneous solutions of the LC polymer in xylene. A very significant enhancement of the ER effect in the studied hybrid fluids was observed.

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Zhou, Yuman, Jianxin He, Hongbo Wang, Nan Nan, Kun Qi i Shizhong Cui. "Fabrication of superhydrophobic nanofiber fabric with hierarchical nanofiber structure". e-Polymers 17, nr 3 (1.05.2017): 249–54. http://dx.doi.org/10.1515/epoly-2016-0170.

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AbstractPolyvinylidene fluoride (PVDF) nanofiber fabric, polyvinylidene fluoride/polyethylene glycol (PVDF/PEG) nanofiber fabric and polyvinylidene fluoride/polyethylene glycol/silicon dioxide (PVDF/PEG/SiO2) nanofiber fabrics are fabricated through a combination of electrospinning and weaving technology, inspired by the “lotus effect”. Nanofiber surfaces with a hierarchical nanofiber structure in the PVDF/PEG and PVDF/PEG/SiO2 nanofiber fabrics are formed by hydrolyzing PEG and doping with SiO2 nanoparticles, which is similar to the surface structure of a lotus leaf. The structures of these three fabrics are characterized by field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) and the mechanical properties and wettability are analyzed. The results show that the fiber structure of the PVDF/PEG composite nanofiber doped with SiO2 nanoparticles after water scrubbing is composed of many balls, which are formed by the embedding of the SiO2 nanoparticles in the polymer. Moreover, the “ball” is not only similar to the “hill” of a lotus leaf surface, but also similar to the “small thorn” on the “hill” because of the embossment of SiO2 nanoparticles on the “ball” surface. The ultimate tensile strength and failure strain of the PVDF/PEG/SiO2 nanofiber fabric are 92.12 MPa and 18.98%, respectively. The PVDF/PEG/SiO2 nanofiber fabric exhibits superhydrophobicity with a water contact angle of 173.2°.

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Öner, Mualla, Semra Kirboga, Emrah Sefik Abamor, Kubra Karadas i Zeynep Kral. "The influence of silicon-doped hydroxyapatite nanoparticles on the properties of novel bionanocomposites based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate)". Express Polymer Letters 17, nr 4 (2023): 417–33. http://dx.doi.org/10.3144/expresspolymlett.2023.30.

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Bondarenko, Siegfried, Claus Villringer i Patrick Steglich. "Comparative Study of Nano-Slot Silicon Waveguides Covered by Dye Doped and Undoped Polymer Cladding". Applied Sciences 9, nr 1 (27.12.2018): 89. http://dx.doi.org/10.3390/app9010089.

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Nonlinear optical dyes doped in optical polymer matrices are widely used for electro-optical devices. Linear optical properties change with dye concentration, which leads to a change in modal properties, especially in nano-structured integrated waveguides such as silicon slot-waveguides. Here, we investigate the influence of a nonlinear optical dye on the performance of a silicon-organic hybrid slot-waveguide. A simulation study of the modal and optical confinement properties is carried out and dependence of the structural parameters of the slot-waveguide and the organic cladding material is taken into account. As cladding material, a guest-host polymer system is employed comprising the nonlinear optical dye Disperse Red 1 (DR1) doped in a poly[methyl methacrylate] (PMMA) matrix. The refractive indices of doped and undoped PMMA were deduced from ellipsometric data. We present a guideline for an optimized slot-waveguide design for the fabrication in silicon-on-insulator technology giving rise to scalable, high-performance integrated electro-optical modulators.

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Yang, Ning, Zhen Zhang, Shizheng Li, Xiao Yuan, Xiaojun Ye, Cui Liu i Hongbo Li. "Efficiency improvement of B/Ga co-doped p-type multicrystalline silicon passivated emitter and rear cells induced by B/Al co-doping". Materials Research Express 6, nr 11 (11.10.2019): 115914. http://dx.doi.org/10.1088/2053-1591/ab4a62.

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Imae, Ichiro, Hiroki Kataoka i Yutaka Harima. "Flexible thermoelectric materials based on conducting polymers doped with silicone polymer electrolyte". Molecular Crystals and Liquid Crystals 685, nr 1 (24.05.2019): 100–106. http://dx.doi.org/10.1080/15421406.2019.1645467.

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Sołoducho, Jadwiga, Dorota Zając, Kamila Spychalska, Sylwia Baluta i Joanna Cabaj. "Conducting Silicone-Based Polymers and Their Application". Molecules 26, nr 7 (1.04.2021): 2012. http://dx.doi.org/10.3390/molecules26072012.

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Over the past two decades, both fundamental and applied research in conducting polymers have grown rapidly. Conducting polymers (CPs) are unique due to their ease of synthesis, environmental stability, and simple doping/dedoping chemistry. Electrically conductive silicone polymers are the current state-of-the-art for, e.g., optoelectronic materials. The combination of inorganic elements and organic polymers leads to a highly electrically conductive composite with improved thermal stability. Silicone-based materials have a set of extremely interesting properties, i.e., very low surface energy, excellent gas and moisture permeability, good heat stability, low-temperature flexibility, and biocompatibility. The most effective parameters constructing the physical properties of CPs are conjugation length, degree of crystallinity, and intra- and inter-chain interactions. Conducting polymers, owing to their ease of synthesis, remarkable environmental stability, and high conductivity in the doped form, have remained thoroughly studied due to their varied applications in fields like biological activity, drug release systems, rechargeable batteries, and sensors. For this reason, this review provides an overview of organosilicon polymers that have been reported over the past two decades.

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Fomin, Maxim A., Andrey L. Chernev, Nicolay T. Bagraev, Leonid E. Klyachkin, Anton K. Emelyanov i Michael V. Dubina. "Dielectric properties of oligonucleotides on the surface of Si nanosandwich structures". Физика и техника полупроводников 52, nr 5 (2018): 512. http://dx.doi.org/10.21883/ftp.2018.05.45856.45.

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AbstractPlanar silicon nanostructures that are formed as a very narrow silicon quantum well confined by delta-barriers heavily doped with boron are used to study the dielectric properties of DNA oligonucleotides deposited onto the surface of the nanostructures. The capacitance characteristics of the silicon nanostructures with oligonucleotides deposited onto their surface are determined by recording the local tunneling current- voltage characteristics by means of scanning tunneling microscopy. The results show the possibility of identifying the local dielectric properties of DNA oligonucleotide segments consisting of repeating G–C pairs. These properties apparently give grounds to correlate the segments with polymer molecules exhibiting the properties of multiferroics.

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He, Zemin, Ping Yu, Huimin Zhang, Yuzhen Zhao, Yanfang Zhu, Zhun Guo, Cheng Ma, Haiquan Zhang, Zongcheng Miao i Wenbo Shen. "Silicon nanostructure-doped polymer/nematic liquid crystal composites for low voltage-driven smart windows". Nanotechnology 33, nr 8 (3.12.2021): 085205. http://dx.doi.org/10.1088/1361-6528/ac3a3b.

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Abstract In this work, two silicon nanostructures were doped into polymer/nematic liquid crystal composites to regulate the electric-optical performance. Commercial SiO2 nanoparticles and synthesized thiol polyhedral oligomeric silsesquioxane (POSS-SH) were chosen as the dopants to afford the silicon nanostructures. SiO2 nanoparticles were physically dispersed in the composites and the nanostructure from POSS-SH was implanted into the polymer matrix of the composites via photoinduced thiol-ene crosslinking. Scanning electron microscopy results indicated that the implantation of POSS microstructure into the polymer matrix was conducive to obtaining the uniform porous polymer microstructures in the composites while the introduction of SiO2 nanoparticles led to the loose and heterogeneous polymer morphologies. The electric-optical performance test results also demonstrated that the electric-optical performance regulation effect of POSS microstructure was more obvious than that of SiO2 nanoparticles. The driving voltage was reduced by almost 80% if the concentration of POSS-SH in the composite was nearly 8 wt% and the sample could be completely driven by the electric field whose voltage was lower than the safe voltage for continuous contact (24 V). This work could provide a creative approach for the regulation of electric-optical performance for polymer/nematic liquid crystal composites and the fabrication of low voltage-driven PDLC films for smart windows.

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Babeva, Tsvetanka. "Special Issue: “Optical Thin Films and Structures: Design and Advanced Applications”". Coatings 10, nr 11 (23.11.2020): 1140. http://dx.doi.org/10.3390/coatings10111140.

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This Special Issue is devoted on design and application of thin films and structures with special emphasis on optical applications. It comprises ten papers, five featured and five regular papers, authored by respective scientists all over the world. Diverse materials are studied and their possible applications are demonstrated and discussed: transparent conductive coatings and structures from ZnO doped with Al and Ga and Ti-doped SnO2, polymer and nanosized zeolite thin films for optical sensing, TiO2 with linear and non-linear optical properties, organic diamagnetic materials, broadband optical coatings, CrWN glass molding coatings and silicon on insulator waveguides.

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Sekula, Robert, Kirsi Immonen, Sini Metsä-Kortelainen, Maciej Kuniewski, Paweł Zydroń i Tomi Kalpio. "Characteristics of 3D Printed Biopolymers for Applications in High-Voltage Electrical Insulation". Polymers 15, nr 11 (30.05.2023): 2518. http://dx.doi.org/10.3390/polym15112518.

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Three-dimensional printing technology is constantly developing and has a wide range of applications; one application is electrical insulation, where the standard technology uses polymer-based filaments. Thermosetting materials (epoxy resins, liquid silicone rubbers) are broadly used as electrical insulation in high-voltage products. In power transformers, however, the main solid insulation is based on cellulosic materials (pressboard, crepe paper, wood laminates). There are a vast variety of transformer insulation components that are produced using the wet pulp molding process. This is a labor-intensive, multi-stage process that requires long drying times. In this paper, a new material, microcellulose-doped polymer, and manufacturing concept for transformer insulation components are described. Our research focuses on bio-based polymeric materials with 3D printability functionalities. A number of material formulations were tested and benchmark products were printed. Extensive electrical measurements were performed to compare transformer components manufactured using the traditional process and 3D printed samples. The results are promising but indicate that further research is still required to improve printing quality.

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Alfahed, R. K., K. I. Ajeel i A. K. Hassan. "Effect Of Cobalt’s Chloride On The Optical Properties Of Poly (O-Toluidine) And Study Of It’s Organic/Inorganic Solar Cell". European Scientific Journal, ESJ 12, nr 3 (30.01.2016): 224. http://dx.doi.org/10.19044/esj.2016.v12n3p224.

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Preparation of poly (o-toluidine) was doped by different volume ratios of cobalt chloride and characterized by (FT-IR, XRD and SEM). The results showed that the intensity of absorption increased while energy gaps of the prepared polymer decreased with respect to increasing ratio of the dopant where the direct and indirect energy gaps were calculated, in addition to edge of the absorption. Photovoltaic device was fabricated by deposit the prepared polymer on the n-type silicon by spin coating method, so the batter efficiency of the prepared devices was 3.02% which was tested under dark and illumination with intensity of 100mW/cm².

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