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Artículos de revistas sobre el tema "Catalytic and optical properties"

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Publicado: 9 de marzo de 2024

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1

Kryukov, A. I., A. L. Stroyuk, N. N. Zin’chuk, A. V. Korzhak y S. Ya Kuchmii. "Optical and catalytic properties of Ag2S nanoparticles". Journal of Molecular Catalysis A: Chemical 221, n.º 1-2 (noviembre de 2004): 209–21. http://dx.doi.org/10.1016/j.molcata.2004.07.009.

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2

Pastoriza-Santos, Isabel, Jorge Pérez-Juste, Susana Carregal-Romero, Pablo Hervés y Luis M Liz-Marzán. "Metallodielectric Hollow Shells: Optical and Catalytic Properties". Chemistry – An Asian Journal 1, n.º 5 (20 de noviembre de 2006): 730–36. http://dx.doi.org/10.1002/asia.200600194.

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3

Ding, Yi y Mingwei Chen. "Nanoporous Metals for Catalytic and Optical Applications". MRS Bulletin 34, n.º 8 (agosto de 2009): 569–76. http://dx.doi.org/10.1557/mrs2009.156.

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AbstractNanoporous metals (NPMs) made by dealloying represent a class of functional materials with the unique structural properties of mechanical rigidity, electrical conductivity, and high corrosion resistance. They also possess a porous network structure with feature dimensions tunable within a wide range from a few nanometers to several microns. Coupled with a rich surface chemistry for further functionalization, NPMs have great potential for applications in heterogeneous catalysis, electrocatalysis, fuel cell technologies, biomolecular sensing, surface-enhanced Raman scattering (SERS), and plasmonics. This article summarizes recent advances in some of these areas and, in particular, we focus on the discussion of microstructure, catalytic, and optical properties of nanoporous gold (NPG). With advanced electron microscopy, three-dimensional tomographic reconstructions of NPG have been realized that yield quantitative characterizations of key morphological parameters involved in the intricate structure. Catalytic and electrocatalytic investigations demonstrate that bare NPG is already catalytically active for many important reactions such as CO and glucose oxidation. Surface functionalization with other metals, such as Pt, produces very efficient electrocatalysts, which have been used as promising fuel cell electrode materials with very low precious metal loading. Additionally, NPG and related materials possess outstanding optical properties in plasmonics and SERS. They hold promise to act as highly active, stable, and economically affordable substrates in high-performance instrumentation applications for chemical inspection and biomolecular diagnostics. Finally, we conclude with some perspectives that appear to warrant future investigation.
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4

Zhao, Jian y Huaiyong Zhu. "Optical, Catalytic and Photocatalytic Properties of Gold Nanoparticles". Reviews in Advanced Sciences and Engineering 3, n.º 1 (1 de marzo de 2014): 66–80. http://dx.doi.org/10.1166/rase.2014.1053.

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5

Zhang, Jun, Xiao Zhang, Zhiyuan Ren, Lun Yang, Yalu Tang, Yalin Ma, Yu Cui, Benling Gao y P. K. Chu. "Influence of photon reabsorption on the optical and catalytic properties of carbon nanodots/titanium oxide composites". Applied Physics Letters 120, n.º 21 (23 de mayo de 2022): 213902. http://dx.doi.org/10.1063/5.0093878.

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To enhance the optical and catalytic properties of TiO2, carbon nanodots (CNDs) are incorporated to prepare hybrid CNDs/TiO2 materials with different precursor concentrations and the photocatalytic characteristics are evaluated systematically. When the CNDs/TiO2 materials are excited optically, some high-energy photons are reabsorbed by those in the lower energy states, indicating that photon reabsorption of CNDs plays a key role. The results enrich our understanding of the optical and catalytic mechanisms and provide insight into the design of CNDs-based composites.
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6

Sakkaki, Milad y Seyed Mohammad Arab. "Non-catalytic applications of g-C3N4: A brief review". Synthesis and Sintering 2, n.º 4 (30 de diciembre de 2022): 176–80. http://dx.doi.org/10.53063/synsint.2022.24126.

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The g-C3N4 which is well known as a polymeric non-metal semiconductor, has been fabricated by thermal polymerization. It has also been used in catalytic applications including, photo-catalysis, removal and degradation of pollutants in water, Friedel-Crafts reactions, oxygen reduction reaction and etc. It has drawn noticeable research attention due to its economical and affordable fabrication, non-toxicity, biocompatibility, good thermal and electrical conductivity, high hardness, Corrosion resistance, and fireproofing properties. Therefore, the g-C3N4 has found non-catalytic applications including composites, cutting tools, improving surface properties, light emitting devices, optical sensors, and solar cells. In the current review, the novel and non-catalytic applications of g-C3N4 have been highlighted.
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7

Mykhailovych, Vasyl, Andrii Kanak, Ştefana Cojocaru, Elena-Daniela Chitoiu-Arsene, Mircea Nicolae Palamaru, Alexandra-Raluca Iordan, Oleksandra Korovyanko et al. "Structural, Optical, and Catalytic Properties of MgCr2O4 Spinel-Type Nanostructures Synthesized by Sol–Gel Auto-Combustion Method". Catalysts 11, n.º 12 (1 de diciembre de 2021): 1476. http://dx.doi.org/10.3390/catal11121476.

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Spinel chromite nanoparticles are prospective candidates for a variety of applications from catalysis to depollution. In this work, we used a sol–gel auto-combustion method to synthesize spinel-type MgCr2O4 nanoparticles by using fructose (FS), tartaric acid (TA), and hexamethylenetetramine (HMTA) as chelating/fuel agents. The optimal temperature treatment for the formation of impurity-free MgCr2O4 nanostructures was found to range from 500 to 750 °C. Fourier transform infrared (FTIR) spectroscopy was used to determine the lattice vibrations of the corresponding chemical bonds from octahedral and tetrahedral positions, and the optical band gap was calculated from UV–VIS spectrophotometry. The stabilization of the spinel phase was proved by X-ray diffraction (XRD) and energy-dispersive X-ray (EDX) analysis. From field-emission scanning electron microscopy (FE-SEM), we found that the size of the constituent particles ranged from 10 to 40 nm. The catalytic activity of the as-prepared MgCr2O4 nanocrystals synthesized by using tartaric acid as a chelating/fuel agent was tested on the decomposition of hydrogen peroxide. In particular, we found that the nature of the chelating/fuel agent as well as the energy released during the auto-combustion played an important role on the structural, optical, and catalytic properties of MgCr2O4 nanoparticles obtained by this synthetic route.
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8

Das, Swapan K., Manas K. Bhunia y Asim Bhaumik. "Self-assembled TiO2 nanoparticles: mesoporosity, optical and catalytic properties". Dalton Transactions 39, n.º 18 (2010): 4382. http://dx.doi.org/10.1039/c000317d.

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9

Thota, Sravan, Yongchen Wang y Jing Zhao. "Colloidal Au–Cu alloy nanoparticles: synthesis, optical properties and applications". Materials Chemistry Frontiers 2, n.º 6 (2018): 1074–89. http://dx.doi.org/10.1039/c7qm00538e.

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10

AKBAR, L., K. ALI, M. SAJJAD, A. SATTAR, B. SALEEM, U. AMJAD, A. RIZWAN et al. "ENHANCEMENT IN OPTICAL PROPERTIES OF COBALT DOPED TiO2 NANOPARTICLES". Digest Journal of Nanomaterials and Biostructures 15, n.º 2 (abril de 2020): 329–35. http://dx.doi.org/10.15251/djnb.2020.152.329.

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Cobalt doped titanium dioxide has consumed great consideration because of their photo catalytic activity and numerous utilizations in paints, white pigments and tooth paste. The co-precipitation technique was utilized in this present study to produce titanium dioxide nanoparticles using (TTIP) titanium tetra iso-propoxide and cobalt nitrate as a starting precursor. Cobalt doped TiO2nanoparticles were synthesized up to four to seven percent of cobalt composition. The Morphology of nanoparticles, crystal structure and optical characteristics were analyzed by XRD, UV-vis spectroscopy and scanning electron microscopy, respectively. Functional groups of cobalt doped TiO2 nanoparticles were confirmed by Fourier transform infrared spectroscopy (FTIR). The modified cobalt-doped titanium dioxide exhibits increased absorption in UV region as increasing cobalt content. The main purpose of this research is to enhance the photo catalytic activity and observe the dimensions, morphology and cobalt concentration as well as shape of prepared nanoparticles.
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11

Shuvarakova, Ekaterina I., Ekaterina V. Ilyina, Vladimir O. Stoyanovskii, Grigory B. Veselov, Alexander F. Bedilo y Aleksey A. Vedyagin. "Exploration of Optical, Redox, and Catalytic Properties of Vanadia-Mayenite Nanocomposites". Journal of Composites Science 6, n.º 10 (12 de octubre de 2022): 308. http://dx.doi.org/10.3390/jcs6100308.

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The present paper continues the exploration of the physicochemical and catalytic properties of vanadia-mayenite composites. The samples were prepared by an impregnation of calcium aluminate Ca12Al14O33 (mayenite, C12A7) with a solution of vanadium precursor. Pure mayenite and V/C12A7 nanocomposites were characterized by Raman and diffuse reflectance UV–Vis spectroscopies. The reducibility of the samples was examined in temperature-programmed reduction experiments performed in a hydrogen atmosphere. The catalytic performance of vanadium-containing systems was studied in the non-oxidative dehydrogenation of ethane. As found, the low-loaded sample (5%V/C12A7 sample) contains vanadium predominantly in the form of Ca3(VO4)2, while for the 10%V/C12A7 sample, two types of calcium vanadates (Ca2V2O7 and Ca3(VO4)2) are registered. The presence of these phases defines the spectroscopic characteristics and the redox properties of nanocomposites. Both the samples, 5%V/C12A7 and 10%V/C12A7, exhibit comparable catalytic activity, which is mainly connected with the amount of the Ca3(VO4)2 phase. The uniqueness of the studied catalysts is their excellent tolerance toward coke formation under the reaction conditions.
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12

Ahmad, Tokeer, Ruby Phul, Parvez Alam, Irfan H. Lone, Mohd Shahazad, Jahangeer Ahmed, Tansir Ahamad y Saad M. Alshehri. "Dielectric, optical and enhanced photocatalytic properties of CuCrO2 nanoparticles". RSC Advances 7, n.º 44 (2017): 27549–57. http://dx.doi.org/10.1039/c6ra26888a.

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Delafossite CuCrO2 nanoparticles with band gap energy of 3.09 eV and surface area of 235 m2 g−1 were prepared by citrate precursor route showed enhanced catalytic degradation of methylene blue in H2O under the sunlight irradiation.
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13

Iordache, Mihaela, Anisoara Oubraham, Ioan-Sorin Sorlei, Florin Alexandru Lungu, Catalin Capris, Tudor Popescu y Adriana Marinoiu. "Noble Metals Functionalized on Graphene Oxide Obtained by Different Methods—New Catalytic Materials". Nanomaterials 13, n.º 4 (20 de febrero de 2023): 783. http://dx.doi.org/10.3390/nano13040783.

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In recent years, research has focused on developing materials exhibiting outstanding mechanical, electrical, thermal, catalytic, magnetic and optical properties such as graphene/polymer, graphene/metal nanoparticles and graphene/ceramic nanocomposites. Two-dimensional sp2 hybridized graphene has become a material of choice in research due to the excellent properties it displays electrically, thermally, optically and mechanically. Noble nanomaterials also present special physical and chemical properties and, therefore, they provide model building blocks in modifying nanoscale structures for various applications, ranging from nanomedicine to catalysis and optics. The introduction of noble metal nanoparticles (NPs) (Au, Ag and Pd) into chemically derived graphene is important in opening new avenues for both materials in different fields where they can provide hybrid materials with exceptional performance due to the synergistical result of the specific properties of each of the materials. This review presents the different synthetic procedures for preparing Pt, Ag, Pd and Au NP/graphene oxide (GO) and reduced graphene oxide (rGO) composites.
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14

Kim, Jun-Hyun, Brett W. Boote, Julie A. Pham, Jiayun Hu y Hongsik Byun. "Thermally tunable catalytic and optical properties of gold–hydrogel nanocomposites". Nanotechnology 23, n.º 27 (19 de junio de 2012): 275606. http://dx.doi.org/10.1088/0957-4484/23/27/275606.

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15

Kozytskiy, Andriy V., Alexandra E. Raevskaya, Oleksandr L. Stroyuk, Igor E. Kotenko, Nikolai A. Skorik y Stepan Ya Kuchmiy. "Morphology, optical and catalytic properties of polyethyleneimine-stabilized Au nanoparticles". Journal of Molecular Catalysis A: Chemical 398 (marzo de 2015): 35–41. http://dx.doi.org/10.1016/j.molcata.2014.11.017.

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16

Waterhouse, Geoffrey I. N., Wan-Ting Chen, Andrew Chan, Haishun Jin, Dongxiao Sun-Waterhouse y Bruce C. C. Cowie. "Structural, Optical, and Catalytic Support Properties of γ-Al2O3Inverse Opals". Journal of Physical Chemistry C 119, n.º 12 (13 de marzo de 2015): 6647–59. http://dx.doi.org/10.1021/acs.jpcc.5b00437.

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17

Chen, Jinhua, Chengshan Xue, Huizhao Zhuang, Zhaozhu Yang, Lixia Qin, Hong Li y Yinglong Huang. "Catalytic synthesis and optical properties of large-scale GaN nanorods". Journal of Alloys and Compounds 468, n.º 1-2 (enero de 2009): L1—L4. http://dx.doi.org/10.1016/j.jallcom.2007.12.078.

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18

Purushothaman, V., P. Sundara Venkatesh, R. Navamathavan y K. Jeganathan. "Direct comparison on the structural and optical properties of metal-catalytic and self-catalytic assisted gallium nitride (GaN) nanowires by chemical vapor deposition". RSC Adv. 4, n.º 85 (2014): 45100–45108. http://dx.doi.org/10.1039/c4ra05388e.

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19

Zhang, Xiaolong, Bingbing Han, Yaxin Wang, Yang Liu, Lei Chen y Yongjun Zhang. "Catalysis of Organic Pollutants Abatement Based on Pt-Decorated Ag@Cu2O Heterostructures". Molecules 24, n.º 15 (26 de julio de 2019): 2721. http://dx.doi.org/10.3390/molecules24152721.

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Pt-decorated Ag@Cu2O heterostructures were successfully synthesized using a simple and convenient method. The Pt nanoparticle density on the Ag@Cu2O can be controlled by changing the concentration of the Pt precursor. The synthesized Ag@Cu2O–Pt nanoparticles exhibited excellent catalytic performance, which was greatly affected by changes in the Ag@Cu2O–Pt structure. To optimize the material’s properties, the synthesized Ag@Cu2O–Pt nanoparticles were used to catalyze toxic pollutants and methyl orange (MO), and nontoxic products were obtained by catalytic reduction. The Pt-decorated Ag@Cu2O nanoparticles showed excellent catalytic activity, which significantly decreased the pollutant concentration when the nanoparticles were used for catalytic reduction. The redistribution of charge transfer is the nanoparticles’ main contribution to the catalytic degradation of an organic pollutant. This Pt-decorated Ag@Cu2O material has unique optical and structural characteristics that make it suitable for photocatalysis, local surface plasmon resonance, and peroxide catalysis.
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20

Brisson, Emma R. L., Zeyun Xiao y Luke A. Connal. "Amino Acid Functional Polymers: Biomimetic Polymer Design Enabling Catalysis, Chiral Materials, and Drug Delivery". Australian Journal of Chemistry 69, n.º 7 (2016): 705. http://dx.doi.org/10.1071/ch16028.

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Amino acids are the natural building blocks for the world around us. Highly functional, these small molecules have unique catalytic properties, chirality, and biocompatibility. Imparting these properties to surfaces and other macromolecules is highly sought after and represents a fast-growing field. Polymers functionalized with amino acids in the side chains have tunable optical properties, pH responsiveness, biocompatibility, structure and self-assembly properties. Herein, we review the synthesis of amino acid functional polymers, discuss manipulation of available strategies to achieve the desired responsive materials, and summarize some exciting applications in catalysis, chiral particles, and drug delivery.
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21

Saha, Suchismita, Amit Ghosh, Thomas Paululat y Michael Schmittel. "Allosteric regulation of rotational, optical and catalytic properties within multicomponent machinery". Dalton Transactions 49, n.º 25 (2020): 8693–700. http://dx.doi.org/10.1039/d0dt01961e.

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Allosteric regulation of various functions within multicomponent machinery was triggered by the reversible transformation of nanorotors (k298 = 44–61 kHz) to “dimeric” supramolecular structures (k298 = 0.60 kHz) upon adding a stoichiometric chemical stimulus.
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22

Hernley, Paul A., Steven A. Chavez, Joseph P. Quinn y Suljo Linic. "Engineering the Optical and Catalytic Properties of Co-Catalyst/Semiconductor Photocatalysts". ACS Photonics 4, n.º 4 (7 de abril de 2017): 979–85. http://dx.doi.org/10.1021/acsphotonics.7b00047.

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23

Amir, Md, S. Güner, A. Yıldız y A. Baykal. "Magneto-optical and catalytic properties of Fe3O4@HA@Ag magnetic nanocomposite". Journal of Magnetism and Magnetic Materials 421 (enero de 2017): 462–71. http://dx.doi.org/10.1016/j.jmmm.2016.08.037.

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24

Ragupathi, C., J. Judith Vijaya, L. John Kennedy y M. Bououdina. "Nanostructured copper aluminate spinels: Synthesis, structural, optical, magnetic, and catalytic properties". Materials Science in Semiconductor Processing 24 (agosto de 2014): 146–56. http://dx.doi.org/10.1016/j.mssp.2014.03.026.

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25

MA, DONGLING y ARNOLD KELL. "HOLLOW, BRANCHED AND MULTIFUNCTIONAL NANOPARTICLES: SYNTHESIS, PROPERTIES AND APPLICATIONS". International Journal of Nanoscience 08, n.º 06 (diciembre de 2009): 483–514. http://dx.doi.org/10.1142/s0219581x09006419.

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Nanoscale materials with various structures have attracted extensive research interest during the past decade. Among them, hollow, branched and multifunctional nanoparticles comprised of two different nanoparticle components are emerging as new classes of interesting nanomaterials owing to the unique optical, catalytic, electrical, magnetic and mechanical properties associated with their unusual morphologies as well as their potential wide range of applications in various fields such as photothermal therapy, diagnosis, drug delivery, catalysis, optoelectronic, electronics and biodiagnostics. In particular, branched nanoparticles promise to serve as building blocks for more complex materials and advanced devices through self-assembly and self-alignment and heterodimeric nanoparticles show promise for the development of tunable magnetic materials and multimodal biodiagnostic imaging tools.
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26

Rahman, Md Ataur, Tajmeri SA Islam y Md Mufazzal Hossain. "Optical, Magnetic and Adsorptive Properties of Prepared Copper(II) Oxide". Dhaka University Journal of Science 68, n.º 1 (30 de enero de 2020): 7–12. http://dx.doi.org/10.3329/dujs.v68i1.54593.

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We report the surface morphology, structural propertiesand surface characterization of copper(II) oxide by scanning electron microscope, energy dispersive X-ray spectroscopy, Fourier transformation infrared spectroscopy, attenuated total reflection infrared spectroscopy and X-ray diffraction. All the data of analysis were consistent with each other and bear the evidence for the purity of the prepared oxide. Kubelka-Munk (K-M) theory is used for the determination of direct band gap of the prepared oxide from UV-visible reflectance spectrum. The band gap value of the bulk material was found to be 4.15 0.05 eV from F(R) versus energy and (F(R) hv)n versus energy plots, with n=1/2 and n=2 Molar magnetic susceptibility and effective magnetic moment of the oxide are 3.393×10-4(cgs) and 0.895 BM respectively which suggest that the oxide is paramagnetic. Catalytic activity was investigated by the study of adsorption of brilliant red (BR) on the surface of prepared oxide in aqueous medium at room temperature. Adsorption isotherm shows that BR moleculesare adsorbed layer by layer on the surface of oxide. Study of the adsorption phenomenon in this work suggest that copper(II) oxide has significant adsorptive and catalytic property. Dhaka Univ. J. Sci. 68(1): 7-12, 2020 (January)
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27

Khuzin, A. A., A. R. Tuktarov, V. A. Barachevsky, T. M. Valova, A. R. Tulyabaev y U. M. Dzhemilev. "Synthesis, photo and acidochromic properties of spiropyran-containing methanofullerenes". RSC Advances 10, n.º 27 (2020): 15888–92. http://dx.doi.org/10.1039/d0ra00217h.

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Spiropyran-containing methanofullerenes able to rapidly and reversibly respond to optical and chemical stimuli were synthesized for the first time by the Bingel–Hirsch reaction and catalytic cycloaddition of diazo compounds to carbon clusters.
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28

Miyagawa, Masaya, Akane Shibusawa, Kaho Maeda, Akiyoshi Tashiro, Toshiki Sugai y Hideki Tanaka. "Diameter-controlled Cu nanoparticles on saponite and preparation of film by using spontaneous phase separation". RSC Advances 7, n.º 66 (2017): 41896–902. http://dx.doi.org/10.1039/c7ra08659h.

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29

Rodríguez-Proenza, Carlos, Juan Palomares-Báez, Marco Chávez-Rojo, Amado García-Ruiz, Cristy Azanza-Ricardo, Alan Santoveña-Uribe, Gabriel Luna-Bárcenas, José Rodríguez-López y Rodrigo Esparza. "Atomic Surface Segregation and Structural Characterization of PdPt Bimetallic Nanoparticles". Materials 11, n.º 10 (2 de octubre de 2018): 1882. http://dx.doi.org/10.3390/ma11101882.

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Bimetallic nanoparticles are of interest since they lead to many interesting electrical, chemical, catalytic, and optical properties. They are particularly important in the field of catalysis since they show superior catalytic properties than their monometallic counterparts. The structures of bimetallic nanoparticles depend mainly on the synthesis conditions and the miscibility of the two components. In this work, PdPt alloyed-bimetallic nanoparticles (NPs) were synthesized through the polyol method, and characterized using spherical aberration (Cs) corrected scanning transmission electron microscopy (STEM). High-angle annular dark-field (HAADF)-STEM images of bimetallic nanoparticles were obtained. The contrast of images shows that nanoparticles have an alloy structure with an average size of 8.2 nm. Together with the characterization of nanoparticles, a systematic molecular dynamics simulations study focused on the structural stability and atomic surface segregation trends in 923-atom PdPt alloyed-bimetallic NPs was carried out.
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30

Gale-Mouldey, Alexandra, Emma Jorgenson, Jason P. Coyle, Daniel Prezgot y Anatoli Ianoul. "Hybridized plasmon resonances in core/half-shell silver/cuprous oxide nanoparticles". Journal of Materials Chemistry C 8, n.º 5 (2020): 1852–63. http://dx.doi.org/10.1039/c9tc06512a.

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31

Zheng, Yuhang, Qiang Zhuang, Ying Ruan y Bingbo Wei. "Acoustic levitation synthesis and subsequent physicochemical properties of bimetallic composite nanoparticles". Applied Physics Letters 122, n.º 8 (20 de febrero de 2023): 084102. http://dx.doi.org/10.1063/5.0142319.

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Bimetallic noble-metal nanoparticles were synthesized in a containerless state via acoustic levitation. We chose oleylamine as stabilizer and borane-t-butylamine complex as reducing agent to prepare the Au–Ag nanoparticles in organic phase. The synthesis process, particle size distribution, morphology, optical property, chemical composition, and catalytic performance of prepared bimetallic nanoparticles were characterized and analyzed. The Au–Ag nanoparticles synthesized in acoustic levitation exhibited a smaller size, narrower distribution range, and improved catalytic performance in 4-nitrophenol reduction compared with the normal container condition. In acoustic levitation, the catalytic activity of equiatomic Au–Ag nanoparticles was significantly enhanced due to synergistic effects.
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32

Wang, Tianli, Xue Hu, Xiaodan Zhang, Haiyan Cao, Yuming Huang y Ping Feng. "MoS2 QDs co-catalytic Fenton reaction for highly sensitive photoluminescence sensing of H2O2 and glucose". Analytical Methods 11, n.º 4 (2019): 415–20. http://dx.doi.org/10.1039/c8ay02565g.

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Combing the excellent catalytic and optical properties of MoS2 QDs, the MoS2 QDs-based co-catalytic Fenton system was developed for highly sensitive photoluminescence sensing of H2O2 and glucose.
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33

Martynov, I. V., Sergey M. Novikov, Gleb I. Tselikov, A. V. Syuy y M. V. SYUY. "Photocatalytic properties of nanoscale Au/TiO2 composite". Applied photonics 10, n.º 8 (29 de diciembre de 2023): 5–16. http://dx.doi.org/10.15593/2411-4375/2023.8.01.

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The issue of water pollution by organic compounds is becoming more and more urgent. Semiconducting metal oxides are used for wastewater treatment from organic dyes. However, TiO2 is active only when exposed to UV light. Therefore, modification of the catalytic system is an important task. In our study, we have prepared nanoscale Au/TiO2 composites using femtosecond pulsed laser ablation in liquids. We have studied the optical and structural properties of the composites and demonstrated their potential application as a photocatalyst for the decomposition of the dye methylene blue. The catalytic activity of Au/TiO2 nanocomposites was found to be 1.5 times higher than that of TiO2 under the same conditions.
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34

Chen, Peiyu, Krishnan Murugappan y Martin R. Castell. "Shapes of epitaxial gold nanocrystals on SrTiO3 substrates". Physical Chemistry Chemical Physics 22, n.º 8 (2020): 4416–28. http://dx.doi.org/10.1039/c9cp06801e.

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35

Rong, Yun, Anirban Dandapat, Youju Huang, Yoel Sasson, Lei Zhang, Liwei Dai, Jiawei Zhang, Zhiyong Guo y Tao Chen. "Spatially-controlled growth of platinum on gold nanorods with tailoring plasmonic and catalytic properties". RSC Advances 6, n.º 13 (2016): 10713–18. http://dx.doi.org/10.1039/c5ra23175b.

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36

Khan, Muhammad Arif, Nafarizal Nayan, Shadiullah Shadiullah, Mohd Khairul Ahmad y Chin Fhong Soon. "Surface Study of CuO Nanopetals by Advanced Nanocharacterization Techniques with Enhanced Optical and Catalytic Properties". Nanomaterials 10, n.º 7 (2 de julio de 2020): 1298. http://dx.doi.org/10.3390/nano10071298.

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In the present work, a facile one-step hydrothermal synthesis of well-defined stabilized CuO nanopetals and its surface study by advanced nanocharacterization techniques for enhanced optical and catalytic properties has been investigated. Characterization by Transmission electron microscopy (TEM) analysis confirmed existence of high crystalline CuO nanopetals with average length and diameter of 1611.96 nm and 650.50 nm, respectively. The nanopetals are monodispersed with a large surface area, controlled morphology, and demonstrate the nanocrystalline nature with a monoclinic structure. The phase purity of the as-synthesized sample was confirmed by Raman spectroscopy and X-ray diffraction (XRD) patterns. A significantly wide absorption up to 800 nm and increased band gap were observed in CuO nanopetals. The valance band (VB) and conduction band (CB) positions at CuO surface are measured to be of +0.7 and −1.03 eV, respectively, using X-ray photoelectron spectroscopy (XPS), which would be very promising for efficient catalytic properties. Furthermore, the obtained CuO nanopetals in the presence of hydrogen peroxide ( H 2 O 2 ) achieved excellent catalytic activities for degradation of methylene blue (MB) under dark, with degradation rate > 99% after 90 min, which is significantly higher than reported in the literature. The enhanced catalytic activity was referred to the controlled morphology of monodispersed CuO nanopetals, co-operative role of H 2 O 2 and energy band structure. This work contributes to a new approach for extensive application opportunities in environmental improvement.
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37

Finkelstein-Shapiro, Daniel, Maxime Fournier, Dalvin D. Méndez-Hernández, Chengchen Guo, Monica Calatayud, Thomas A. Moore, Ana L. Moore, Devens Gust y Jeffery L. Yarger. "Understanding iridium oxide nanoparticle surface sites by their interaction with catechol". Physical Chemistry Chemical Physics 19, n.º 24 (2017): 16151–58. http://dx.doi.org/10.1039/c7cp01516j.

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38

Liu, Kai, Zhun Qiao y Chuanbo Gao. "Preventing the Galvanic Replacement Reaction toward Unconventional Bimetallic Core–Shell Nanostructures". Molecules 28, n.º 15 (28 de julio de 2023): 5720. http://dx.doi.org/10.3390/molecules28155720.

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A bimetallic core–shell nanostructure is a versatile platform for achieving intriguing optical and catalytic properties. For a long time, this core–shell nanostructure has been limited to ones with noble metal cores. Otherwise, a galvanic replacement reaction easily occurs, leading to hollow nanostructures or completely disintegrated ones. In the past few years, great efforts have been devoted to preventing the galvanic replacement reaction, thus creating an unconventional class of core–shell nanostructures, each containing a less-stable-metal core and a noble metal shell. These new nanostructures have been demonstrated to show unique optical and catalytic properties. In this work, we first briefly summarize the strategies for synthesizing this type of unconventional core–shell nanostructures, such as the delicately designed thermodynamic control and kinetic control methods. Then, we discuss the effects of the core–shell nanostructure on the stabilization of the core nanocrystals and the emerging optical and catalytic properties. The use of the nanostructure for creating hollow/porous nanostructures is also discussed. At the end of this review, we discuss the remaining challenges associated with this unique core–shell nanostructure and provide our perspectives on the future development of the field.
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39

Sakai, Takuya, Takuma Kumoi, Tatsuro Ishikawa, Takahiro Nitta y Hiroki Iida. "Comparison of riboflavin-derived flavinium salts applied to catalytic H2O2oxidations". Organic & Biomolecular Chemistry 16, n.º 21 (2018): 3999–4007. http://dx.doi.org/10.1039/c8ob00856f.

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40

Bakr, Eman A., Marwa N. El-Nahass, Wafaa M. Hamada y Tarek A. Fayed. "Facile synthesis of superparamagnetic Fe3O4@noble metal core–shell nanoparticles by thermal decomposition and hydrothermal methods: comparative study and catalytic applications". RSC Advances 11, n.º 2 (2021): 781–97. http://dx.doi.org/10.1039/d0ra08230a.

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We report on developing a facile synthetic route for reusable nanocatalysts based on a combination of the supermagnetic properties of magnetite with the unique optical and catalytic properties of noble metal hybrid nanomaterials.
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41

Chai, Osburg Jin Huang, Zhihe Liu, Tiankai Chen y Jianping Xie. "Engineering ultrasmall metal nanoclusters for photocatalytic and electrocatalytic applications". Nanoscale 11, n.º 43 (2019): 20437–48. http://dx.doi.org/10.1039/c9nr07272a.

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The many fundamental properties of ultrasmall noble metal nanoclusters have made it increasingly clear that they possess enormous potential for photo- and electro-catalytic applications due to their unique electronic and optical properties.
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42

Navalón, Sergio, Wee-Jun Ong y Xiaoguang Duan. "Sustainable Catalytic Processes Driven by Graphene-Based Materials". Processes 8, n.º 6 (5 de junio de 2020): 672. http://dx.doi.org/10.3390/pr8060672.

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In the recent two decades, graphene-based materials have achieved great successes in catalytic processes towards sustainable production of chemicals, fuels and protection of the environment. In graphene, the carbon atoms are packed into a well-defined sp2-hybridized honeycomb lattice, and can be further constructed into other dimensional allotropes such as fullerene, carbon nanotubes, and aerogels. Graphene-based materials possess appealing optical, thermal, and electronic properties, and the graphitic structure is resistant to extreme conditions. Therefore, the green nature and robust framework make the graphene-based materials highly favourable for chemical reactions. More importantly, the open structure of graphene affords a platform to host a diversity of functional groups, dopants, and structural defects, which have been demonstrated to play crucial roles in catalytic processes. In this perspective, we introduced the potential active sites of graphene in green catalysis and showcased the marriage of metal-free carbon materials in chemical synthesis, catalytic oxidation, and environmental remediation. Future research directions are also highlighted in mechanistic investigation and applications of graphene-based materials in other promising catalytic systems.
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43

Zhang, Lei, Qikui Fan, Xiao Sha, Ping Zhong, Jie Zhang, Yadong Yin y Chuanbo Gao. "Self-assembly of noble metal nanoparticles into sub-100 nm colloidosomes with collective optical and catalytic properties". Chemical Science 8, n.º 9 (2017): 6103–10. http://dx.doi.org/10.1039/c7sc01841j.

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44

Henschel, Antje, Kristina Gedrich, Ralph Kraehnert y Stefan Kaskel. "Catalytic properties of MIL-101". Chemical Communications, n.º 35 (2008): 4192. http://dx.doi.org/10.1039/b718371b.

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45

Acharyya, Paribesh, Kaushik Kundu y Kanishka Biswas. "2D layered all-inorganic halide perovskites: recent trends in their structure, synthesis and properties". Nanoscale 12, n.º 41 (2020): 21094–117. http://dx.doi.org/10.1039/d0nr06138g.

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Here, we discuss the recent development in all-inorganic 2D layered halide perovskites highlighting their crystal structure, synthesis, transformations, and optical, thermoelectric, magnetic, and catalytic properties.
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46

Ge, Linlin y Junqi Tang. "Synthesis of Hexagonal Gold Nanoparticles and Study of its Optical and Near-field Distribution Properties by Discrete Dipole Approximation". Journal of Physics: Conference Series 2185, n.º 1 (1 de enero de 2022): 012077. http://dx.doi.org/10.1088/1742-6596/2185/1/012077.

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Abstract Anisotropic nanostructures with unique physical and chemical properties have been widely applied in optical, electronic, magnetic, and catalytic fields. This paper described the synthesis of hexagonal gold nanoplates (HAuNPs) by trisodium citrate and ascorbic acid. The optical and near-field distribution properties of hexagonal gold nanoplates were studied by discrete dipole approximation method. Simulation results showed that due to the shape anisotropy of HAuNPs, the optical properties of HAuNPs were significant differences between the horizontal orientation and vertical orientation.
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47

Siddiq, Muhammad, Khush Bakhat y Muhammad Ajmal. "Stimuli responsive microgel containing silver nanoparticles with tunable optical and catalytic properties". Pure and Applied Chemistry 92, n.º 3 (26 de marzo de 2020): 445–59. http://dx.doi.org/10.1515/pac-2018-1203.

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AbstractIn this work, poly (vinylcaprolactam-co-itaconic acid) microgel was prepared by free radical polymerization. Silver nanoparticles were prepared in synthesized microgel networks by in situ reduction of Ag+ ions, loaded in microgel from aqueous solution of AgNO3. The prepared microgel was characterized by Fourier transformation infra-red spectroscopy, UV-Visible spectroscopy, fluorescence spectroscopy, X-ray diffraction, laser light scattering, thermal gravimetric analysis, differential scanning calorimetry and transmission electron microscopy. Swelling behavior of microgel was studied as a function of temperature and pH. The microgel was found to be in swollen state at low temperature and basic medium while in collapsed state at high temperature and acidic medium. A slight decrease in swelling capacity of microgel was observed after the fabrication of silver nanoparticles. A decrease in the emission intensity and a red shift in surface plasmon resonance wavelength of silver nanoparticles was observed with pH induced swelling of microgel. Catalytic activity of the composite microgel was studied by using them as catalyst for the reduction of 4-nitrophenol, methyl orange and methylene blue. Effects of temperature and catalyst dose were also investigated. The reduction rates of 4-NP, MB and MO were found to be 0.859, 0.0528 and 0.167 min−1, respectively. The change in catalytic performance and shift in absorption maxima and emission intensity of composite microgel as a function of temperature and pH reveals that this system has potential to be used as tunable catalyst and optical sensor.
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48

Osman, Waleed, Mohamed Saad, Medhat Ibrahim, Ibrahim Yahia, Hazem Abdelsalam y Qinfang Zhang. "Electronic, optical, and catalytic properties of finite antimonene nanoribbons: first principles study". Physica Scripta 97, n.º 3 (7 de febrero de 2022): 035802. http://dx.doi.org/10.1088/1402-4896/ac4cfd.

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Abstract Finite antimonene nanoribbons are investigated using density functional theory calculations. Attaching chemical groups, like COOH and OH, to the edges has been successfully attained with negligible deformation and moderate binding energy. They are semiconductors with energy gap ∼2.3 eV that slightly affected by attaching groups such as C2H5 or significantly decreases to 1.8 eV by attaching NO. The optical gaps, from 1.5 eV to 2 eV, are lower than the electronic ones which indicate the existence of excitonic transitions that appear due to the quantum confinement in the finite nanoribbons. Oxygen evolution on the edges shows better catalytic activity than on the surface due to the moderate adsorption of reaction intermediates in the former. Thus, the nanoribbons are preferable for water oxidation than the bulk antimonene. Attaching chemical groups slightly worsen the process due to the stronger adsorption of reaction intermediates. A minimum overpotential of 0.38 V has been achieved in unmodified zigzag-nanoribbons. This value in addition to the appropriate energy gap make antimonene nanoribbons excellent photocatalysts for water splitting.
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49

Venkatesan, P. y J. Santhanalakshmi. "Core-Shell Bimetallic Au-Pd Nanoparticles: Synthesis, Structure, Optical and Catalytic Properties". Nanoscience and Nanotechnology 1, n.º 2 (31 de agosto de 2012): 43–47. http://dx.doi.org/10.5923/j.nn.20110102.08.

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50

Gavrilenko, E. A. y A. A. Biryukov. "Study of optical, dimensional, and catalytic properties of nanodispersed CdS–Na2SiO3 powders". Russian Journal of Applied Chemistry 89, n.º 10 (octubre de 2016): 1579–87. http://dx.doi.org/10.1134/s1070427216100037.

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