Relevant bibliographies by topics / Nanocluster size

Academic literature on the topic 'Nanocluster size'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Nanocluster size"

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Ayesh, Ahmad I., Naser Qamhieh, Saleh Thaker Mahmoud, and Hussain Alawadhi. "Production of Size-Selected CuXSn1-X Nanoclusters." Advanced Materials Research 295-297 (July 2011): 70–73. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.70.

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Composites of copper–tin (CuxSn1-x) nanoclusters were synthesized using the magnetron dc sputtering gas–condensation technique. Targets with controlled ratios of Sn to Cu were used to produce CuxSn1-xwith different compositions. The effects on the nanocluster size and yield of the sputtering discharge power, inert gas flow rate, and aggregation length were investigated using a quadrupole mass filter. The sputtering discharge power was optimized to maximize the nanocluster yield. The results show that as the inert gas flow rate increases the nanocluster size increases and then decreases. These dependences could be understood in terms of the dominant nanocluster production mechanisms. This work demonstrates the ability of controlling the CuxSn1-xnanoclusters’ size and composition by optimizing the source operation conditions.
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Ott, Lisa Starkey, and Richard G. Finke. "Supersensitivity of Transition-Metal Nanoparticle Formation to Initial Precursor Concentration and Reaction Temperature: Understanding Its Origins." Journal of Nanoscience and Nanotechnology 8, no. 3 (March 1, 2008): 1551–56. http://dx.doi.org/10.1166/jnn.2008.089.

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A supersensitivity of the formation and stabilization of transition-metal nanoclusters to the initial nanocluster concentration and temperature synthesis conditions is reported, then probed, herein for the specific case of prototype Ir(0)n nanoclusters prepared from the organometallic precursor [Bu4N]5Na3[(1,5-COD)Ir·P2W15Nb3O62] by reduction with H2 in propylene carbonate solvent. Fully isolable, redissolvable, near-monodisperse (i.e., ≤± 15% size distribution) and thus excellent Ir(0)n nanoclusters are formed using low temperature (22 °C) and moderate precursor concentration (1.2 mM) in propylene carbonate solvent. However, inferior, polydisperse (±40% size distribution), non-redispersable nanoclusters are formed at the seemingly only moderately different conditions of 38 °C higher temperature (i.e., 60 °C) and 5-fold lower precursor concentration (0.24 mM). Investigation of this supersensitivity to the nanocluster synthesis conditions reveals that it derives from the dissociation of (1,5-COD)Ir(solvent)+2 from the P2W15Nb3O9−62 polyanionic ligand/stabilizer, subsequently resulting in a too fast, kinetically uncontrolled reduction of the quickly reduced (1,5-COD)Ir(solvent)+2 as the cause of the inferior synthesis of polydisperse, non-isolable, non-redissolvable nanoclusters. The results are significant in that they illustrate that understanding the mechanism of nanocluster formation, and then performing the nanocluster synthesis under kinetically carefully controlled, understood conditions, is necessary for the formation of superior nanoclusters in this, and by implication probably many other, cases.
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Pandey, D. K., and P. S. Yadav. "Ab-Initio Study of Structural and Electronic Properties of ZnxTey (x + y = 2 to 5) Nanoclusters." Advanced Science, Engineering and Medicine 12, no. 7 (July 1, 2020): 930–38. http://dx.doi.org/10.1166/asem.2020.2634.

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An ab initio study has been performed for the stability, structural and electronic properties of forty-four ZnxTey (x + y = p = 2 to 5) nanoclusters by employing B3LYP-DFT/LANL2DZ method. The zero-point energy correction is also considered in this study. For a particular configuration, the nanoclusters containing a large number of Te atoms are found the most stable structure in comparison with the other nanoclusters. The most stable nanoclusters have either linear or planer structures and, only Zn4Te configuration has no stable structure as the structures of this configuration have at least one imaginary vibrational frequency. The HOMO–LUMO gap of the most stable structure shows a zigzag variation with the increase in the number of atoms in the nanocluster. The observed enhancement trend of the HOMO–LUMO gap with a decrease in the size of the nanocluster confirms to the quantum-confinement effect. The ionization potential (IP) shows decreasing behavior with an increase in the number of atoms in nanoclusters and the variation of electron affinity (EA) with nanocluster size shows zig-zag behavior.
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JIA, JIN-FENG, X. LIU, S. C. LI, J. Z. WANG, J. L. LI, H. LIU, M. H. PAN, et al. "ARTIFICIAL METAL NANOCLUSTER CRYSTALS." Modern Physics Letters B 16, no. 23n24 (October 20, 2002): 889–94. http://dx.doi.org/10.1142/s0217984902004408.

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Artificial metal nanocluster crystals, (i.e. periodic lattices consisting of identical metal nanoclusters) were fabricated using a novel technique in which surface mediated magic clustering was used to achieve identical cluster size, while the Si(111)-7 × 7 surface was used as a template for ordering the clusters. The universality of this strategy was demonstrated by fabricating more than 10 different nanocluster arrays with different metals and alloys. The atomic structures, formation mechanism and stability of the nanoclusters were studied with in situ scanning tunneling microscopy combined with first-principles total energy calculations. Our study shows that delicate control of growth kinetics is extremely important for cluster crystal fabrication.
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Yang, Rui, Daniel M. Chevrier, and Peng Zhang. "Structure and Bonding Properties of a 20-Gold-Atom Nanocluster Studied by Theoretical X-ray Absorption Spectroscopy." MRS Proceedings 1802 (2015): 33–39. http://dx.doi.org/10.1557/opl.2015.516.

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ABSTRACTGold nanoclusters with precisely controlled atomic composition have emerged as promising materials for applications in nanotechnology because of their unique optical, electronic and catalytic properties. The recent discovery of a 20-gold-atom nanocluster protected by 16 organothiolate molecules, Au20(SR)16, is the smallest member in a surprising series of small gold−thiolate nanoclusters with a face-centered cubic (FCC) ordered core structures. A fundamental challenge facing gold nanocluster research is being able to understand the composition-dependent properties from a site-specific perspective in order to confidently establish structure-property relationships. A step in this direction is to examine the influence of various structural features (core geometry and thiolate-gold bonding motifs) on the bonding properties of gold-thiolate nanoclusters. In this work, ab initio simulations were conducted to systematically study the local structure and electronic properties of Au20(SR)16 from each unique Au and S atomic site using Au L3-edge extended X-ray absorption fine structure (EXAFS), projected density of states (l-DOS) and S K-edge X-ray absorption near edge structure (XANES) spectra. Two larger FCC-like gold-thiolate nanoclusters (Au28(SR)20 and Au36(SR)24) were used for a comparative study with Au20(SR)16, providing further predictions about the cluster size effect on the bonding properties of gold-thiolate nanoclusters with FCC-like core structures. Through this comparison, the smaller core size of Au20(SR)16 produces an EXAFS scattering signature that is non-FCC-like but shows very similar electronic properties with a larger FCC-like gold-thiolate nanocluster.
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Mondal, Shyamal, and S. R. Bhattacharyya. "Oxidation behaviour of copper nanofractals produced by soft-landing of size-selected nanoclusters." RSC Advances 5, no. 120 (2015): 99425–30. http://dx.doi.org/10.1039/c5ra20694d.

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We report the oxidation dynamics of a copper nanocluster assembled film, containing fractal islands, fabricated by the soft-landing of size-selected copper nanoclusters with an average diameter of 3 nm.
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Cowan, Michael J., and Giannis Mpourmpakis. "Structure–property relationships on thiolate-protected gold nanoclusters." Nanoscale Advances 1, no. 1 (2019): 184–88. http://dx.doi.org/10.1039/c8na00246k.

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Our recently developed thermodynamic stability theory was applied to a large range of ligand-protected gold nanoclusters, demonstrating its power in accurately capturing stability over large nanocluster size regimes.
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Saj, Alam, Shaikha Alketbi, Sumayya M. Ansari, Dalaver H. Anjum, Baker Mohammad, and Haila M. Aldosari. "Production of Size-Controlled Gold Nanoclusters for Vapor–Liquid–Solid Method." Nanomaterials 12, no. 5 (February 24, 2022): 763. http://dx.doi.org/10.3390/nano12050763.

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This study demonstrated the deposition of size-controlled gold (Au) nanoclusters via direct-current magnetron sputtering and inert gas condensation techniques. The impact of different source parameters, namely, sputtering discharge power, inert gas flow rate, and aggregation length on Au nanoclusters’ size and yield was investigated. Au nanoclusters’ size and size uniformity were confirmed via transmission electron microscopy. In general, Au nanoclusters’ average diameter increased by increasing all source parameters, producing monodispersed nanoclusters of an average size range of 1.7 ± 0.1 nm to 9.1 ± 0.1 nm. Among all source parameters, inert gas flow rate exhibited a strong impact on nanoclusters’ average size, while sputtering discharge power showed great influence on Au nanoclusters’ yield. Results suggest that Au nanoclusters nucleate via a three-body collision mechanism and grow through a two-body collision mechanism, wherein the nanocluster embryos grow in size due to atomic condensation. Ultimately, the usefulness of the produced Au nanoclusters as catalysts for a vapor–liquid–solid technique was put to test to synthesize the phase change material germanium telluride nanowires.
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Ariotti, Nicholas, Hong Liang, Yufei Xu, Yueqiang Zhang, Yoshiya Yonekubo, Kerry Inder, Guangwei Du, Robert G. Parton, John F. Hancock, and Sarah J. Plowman. "Epidermal Growth Factor Receptor Activation Remodels the Plasma Membrane Lipid Environment To Induce Nanocluster Formation." Molecular and Cellular Biology 30, no. 15 (June 1, 2010): 3795–804. http://dx.doi.org/10.1128/mcb.01615-09.

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ABSTRACT Signal transduction is regulated by the lateral segregation of proteins into nanodomains on the plasma membrane. However, the molecular mechanisms that regulate the lateral segregation of cell surface receptors, such as receptor tyrosine kinases, upon ligand binding are unresolved. Here we used high-resolution spatial mapping to investigate the plasma membrane nanoscale organization of the epidermal growth factor (EGF) receptor (EGFR). Our data demonstrate that in serum-starved cells, the EGFR exists in preformed, cholesterol-dependent, actin-independent nanoclusters. Following stimulation with EGF, the number and size of EGFR nanoclusters increase in a time-dependent manner. Our data show that the formation of EGFR nanoclusters requires receptor tyrosine kinase activity. Critically, we show for the first time that production of phosphatidic acid by phospholipase D2 (PLD2) is essential for ligand-induced EGFR nanocluster formation. In accordance with its crucial role in regulating EGFR nanocluster formation, we demonstrate that modulating PLD2 activity tunes the degree of EGFR nanocluster formation and mitogen-activated protein kinase signal output. Together, these data show that EGFR activation drives the formation of signaling domains by regulating the production of critical second-messenger lipids and modifying the local membrane lipid environment.
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Cervellino, Antonio, Cinzia Giannini, and Antonietta Guagliardi. "Determination of nanoparticle structure type, size and strain distribution from X-ray data for monatomic f.c.c.-derived non-crystallographic nanoclusters." Journal of Applied Crystallography 36, no. 5 (September 8, 2003): 1148–58. http://dx.doi.org/10.1107/s0021889803013542.

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Whole-profile-fitting least-squares techniques are applied to simulated and experimental X-ray diffraction patterns of monatomic face-centred cubic (f.c.c.)-derived non-crystallographic nanoclusters to extract structure and size information. Three main structure types have been considered (cuboctahedral, icosahedral and decahedral). Nanocluster structure models have been generated within an original mathematical approach so as to be independent of a specific material. For each structure type, a log-normal size distribution is assumed and a phenomenological function is introduced to model possible additional size-related strain effects. The Debye function method (modified to increase computational efficiency) has been used to obtain the diffracted intensities of the nanocluster. Tests revealed the effectiveness of the method to recognize the structure types correctly and to estimate with good accuracy structure concentrations and size distributions. Application to a thiol-passivated gold nanoparticle sample is presented.
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Dissertations / Theses on the topic "Nanocluster size"

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Conn, Brian E. "Revealing the Magic in Silver Magic Number Clusters: The Development of Size-Evolutionary Patterns for Monolayer Coated Silver-Thiolate Nanoclusters." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1481294367098454.

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Cao, Lu. "Deposition of size-selected nanoclusters." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6616/.

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The work presented in this thesis explores the production and the controlled deposition of size-selected nanoclusters. The size-dependent propagation of gold nanoclusters is investigated by depositing them through few-layer graphene (FLG) using a magnetron sputtering cluster source. Au55 nanoclusters penetrate through the FLG, however Au923 nanoclusters remain on the surface, as imaged by aberration corrected scanning transmission electron microscope (ac-STEM). The control of the atomic structure of gold nanoclusters (Au923) by systematically varying the gas-phase condensation parameters in the magnetron sputtering cluster source (e.g. magnetron power and condensation length) is also reported. Results show we have the ability to eliminate all icosahedral isomers by tuning the formation conditions. The biggest advance reported in the work concerns the new technology of the Matrix Assembly Cluster Source (MACS), which has the potential to increase the production rate of nanoclusters by 7 orders of magnitude from 0. 1-1 nA (from a magnetron source) to 1-1 Om A. The principle of the MACS is demonstrated by the production of Ag and Au clusters. The development of the latest MACS instrument is also described. An equivalent cluster beam current of ~ 1OOnA has been achieved. Gold and silver clusters produced under controlled experimental conditions show a relatively narrow size distribution even without mass selection (at best ±25% in the number of atoms). The mean cluster size can be controlled via the experimental parameters, especially the metal concentration in the matrix. STEM is again the principal tool employed characterize the number and structure of cluster produced by the MACS.
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Pratontep, Sirapat. "Production and characterisation of size-selected nanoclusters on surfaces." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289304.

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Foster, Dawn Michelle. "Production and characterisation by scanning transmission electron microscopy of size-selected noble metal nanoclusters." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7902/.

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In this thesis aberration corrected scanning transmission electron microscopy is employed to study the atomic structure of size-selected nanoclusters. The nanoclusters are produced using a magnetron sputtering gas aggregation cluster source with lateral time of flight mass filter, which enables the deposition of high precision samples. For Au nanoclusters, the combination of these techniques is used to determine atomic structure as a function of size, elucidate cluster growth mechanisms, determine the lowest energy structural isomers and investigate control of atomic structure through growth conditions. To further investigate the atomic structure of Au nanoclusters, an in-situ heating holder for the ac-STEM is used to extract a quantitative value for the energy difference between competing structural isomers. A study of surface melting of Au clusters on amorphous-carbon is also presented and the results are discussed with reference to several models for nanoscale melting. Finally, ac-STEM and STEM EELS are used to study the atomic structure and ageing in air of size-selected Ag nanoclusters. It is shown that exposure to air induces a change in both atomic structure and chemical composition.
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Arredondo, Melissa Gayle. "Zero-Dimensional Magnetite." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14151.

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Low-dimensional magnetic systems are of interest due to several new effects and modifications that occur at sizes below the average domain grain boundary within the bulk material. Molecule-like magnetite (Fe3O4) nanoparticles, with sizes ranging from one to two nm were synthesized and characterized in order to investigate new properties arising from quantum size effects. These small systems will provide opportunities to investigate magnetism of zero-dimension systems. A zero-dimensional object is usually called a quantum dot or artificial atom because its electronic states are few and sharply separated in energy, resembling those within an atom. Since the surface to volume ratio is the highest for zero-dimensional systems, most of the changes to magnetic behavior will be observed in ultra-fine magnetic particles. Chemically functional magnetic nanoparticles, comprised of a Fe3O4 magnetite core encased in a thin aliphatic carboxylate, have been prepared by sequential high temperature decomposition of organometallic compounds in a coordinating solvent. In this work, aliphatic carboxylic acid chain length, reaction temperature and duration were varied to produce small core diameters. In order to correlate size effects with changes in particle formation, it is important to have a through understanding of the structural components. This includes studies of the core size, surface effects, decomposition, electronic properties and magnetic behavior. Quantum size effects were observed in the (Fe3O4)X(carboxylate)Y monolayer protected clusters (MPCs) when the average core diameter was ≤ 2.0 nm, evidenced by a blue shifted absorbance band maxima, suggesting the onset of quantum confinement. These (Fe3O4)X(carboxylate)Y MPCs also posses a complex interplay between surface and finite size effects, which govern the magnetic properties of these zero-dimensional systems. These MPCs are all superparamagnetic above their blocking temperatures with total magnetic anisotropy values greater than the bulk value due to an increase in surface and magnetocrystalline anisotropy. A non-linear decrease in saturation magnetization (MS) [Bohr Magneton] per cluster) as a function of the reciprocal of core radius have been attributed to surface effects such as a magnetically inactive layer or an increase in spin disorder as core diameter decreases. The reduced core dimensions of these MPCs make them ideal candidates for further investigation of quantum magnetic systems.
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Cuko, Andi. "Modelling nano-oxide materials with technological and environmental relevance : silica, titania and titanosilicates Predicting size-dependent emergence of crystallinity in nanomaterials: titania nanoclusters versus nanocrystals Global optimisation of hydroxylated silica clusters: A cascade Monte Carlo Basin Hopping approach." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS368.

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Dans cette thèse, nous nous concentrons sur la modélisation des nano matériaux à base de titane, de silice et de titanosilicate en raison de leur importance technologique. Pour de tels systèmes, d'abord, nous avons identifiez les structures plus stables au moyen des méthodes d'optimisation global. Dans un deuxième temps, nous avons étudié les propriétés structurelles, énergétiques et électroniques de ces nanoparticules en fonction de leur taille, en extrapolant parfois jusqu'à l'échelle macroscopique. Pour une telle caractérisation, nous avons utilisé des méthodes quantiques basées sur la Théorie Fonctionnelle de la Densité. Des résultats obtenus, nous pouvons prédire que: (i) la cristallinité des nanoparticules d'oxyde de titane, qui est la propriété clé pour son activité photocatalytique, émergerait lorsque les nanoparticules atteignent une taille supérieure à 2,0-2,5 nm; (ii) le mélange d'oxyde de titane et de silice pour former des titanosilicates, se révèle thermodynamiquement favorable à l'échelle nanométrique, contrairement à l'échelle macroscopique; (iii) l'hydratation des nanoparticules de silice et de titane, qui joue un rôle important dans le processus d'agrégation et de nucléation pendant la synthèse de nanoparticules plus grandes, est contrôlée par les facteurs environnementaux tels que la température et la pression de vapeur d'eau
In this thesis we focus on modelling of titania, silica and titanosilicate based nano materials because of their technological importance as they are employed in heterogeneous (photo-)catalysis, in electronics gas-sensing etc. to cite a few. For such systems, we firstly performed global optimization studies in gas-phase and water containing environments in order to identify the structures of nanoparticles. Secondly, we studied structural, energetic and electronic size-dependent properties of such nanoparticles as well as their reducibility, extrapolating up to the bulk macroscopic level in some cases. For such characterization we use accurate quantum mechanical methods based on the Density Functional Theory (DFT). Our results point to a series of important predictions such us: i) the crystallinity of titania nanoparticles, which is the key property for the photoactivity, is predicted to emerge when nanoparticles become larger than 2.0-2.5 nm; ii) the mixing of titania and silica to form titanosilicates is found be thermodynamically favorable at the nanoscale, contrary to the bulk; iii) the hydration of silica and titania nanoclusters, which plays an important role in the aggregation and nucleation process during the synthesis of larger nanoparticles, is controlled by environmental factors such as temperature and water vapor pressure as predicted from calculated phase diagrams
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Li, Yu-Chi, and 李昱錡. "Size-tunable copper nanocluster aggregates and their application in hydrogen sulfide sensing on paper-based devices." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/91552947742911627223.

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碩士
國立臺灣大學
化學研究所
104
An one-pot approach has been developed to control the size of penicillamine-copper nanocluster (PA-Cu NC) aggregates through the addition of different concentrations of polystyrene sulfonate (PSS). The PSS-PA-Cu NC aggregates are photoluminescent and have excellent water dispersity, better photostability under UV irradiation, and remarkable sensitivity towards H2S (limit of detection: 650 nM) compared to PA-Cu NC aggregates without PSS dispersion. The practicability of this probe was verified by determination of the H2S concentration in hot spring-water samples. The PSS-PA-Cu NCs were integrated into a portable microfluidic paper-based analytical device (μPAD) for the on/off determination of H2S in hot spring-water samples. This platform targets released H2S gas to avoid interference from other ions in water samples in contrast with conventional H2S detection methods which can only determine H2S directly from solution. The PSS-PA-Cu NC/μPADs use ultra-low sample volumes (5 μL) and feature shorter analysis times (~30 min) compared to conventional solution-based methods. The quantitative results not only can be seen by the naked-eye, as well as facilely recorded and transmitted using a smartphone but also can determined by microplate reader. The LOD of the PSS-PA-Cu NC/μPAD device was 1 μM. In conclusion the PSS-PA-Cu NC/μPADs have great potential to monitor H2S levels in gaseous and liquid samples.
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Yang, Sheng-Hui, and 楊勝輝. "Investigation into Temperature and Size Effects on Behaviors of Water Nanoclusters." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/25027517322540011509.

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碩士
國立中山大學
機械與機電工程學系研究所
94
Structure properties of water clusters are investigated in this study by means of molecular dynamics simulations. The oxygen density profile, dipole moment and hydrogen bond properties of water clusters are all examined. The temperature dependence and size dependence of the structure properties are also explored in the present study. Upon the molecular dynamics simulations, the flexible three-centered (F3C) water potential is used to model the inter- and intra-actions of the water molecule. It is found that as the temperature rises, the density of the oxygen and the average number of hydrogen bonds per water molecule will decrease. The effect of cluster size, however, is less significant on the structure properties. The differences between the structural properties for the surface region and those for the interior region of the cluster are also investigated. It is found that as the temperature rises, the average number of hydrogen bonds per water molecule decreases, but the ratio of surface water molecules increases. After comparing the water densities in interior regions and the average number of hydrogen bonds in those regions, we find there is no apparent size effect on water molecules in the interior region, whereas the size of the water cluster has a significant influence on the behavior of water molecules at the surface region.
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Liu, Chien-Hung, and 劉健宏. "Study of site-selective photoluminescence in gold nanoclusters." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/14810902815242833948.

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碩士
中原大學
物理研究所
100
Photoluminescence (PL) from the Au nanoclusters (NCs) has been investigated. Upon scanning the excitation light with energy below 2.1 eV down to 1.6 eV, the PL narrows and begins shifting linearly with excitation energy. The time-resolved PL was studied and the PL decay traces of Au NCs were found to depend on the excitation and emission energies. We observed absorption peak of site-selective PL from photoluminescence excitation (PLE). The effect of site-selective PL was found to depend on the capping molecules of Au NCs. In addition, we studied the PL in Au NCs in low temperatures, and found it involves different emission mechanism.
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Hsieh, Cheng-Yin, and 謝政穎. "Syntheses, Characterizations and Applications of CdSe Magic-Size Nanoclusters and 2D Nanosheets." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/41856149167442924022.

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Books on the topic "Nanocluster size"

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Pratontep, Sirapat. Production and characterisation of size-selected nanoclusters on surfaces. Birmingham: University of Birmingham, 2002.

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(Editor), Benedetto Corain, Guenter Schmid (Editor), and N. Toshima (Editor), eds. Metal Nanoclusters in Catalysis and Materials Science: The Issue of Size Control. Elsevier Science, 2007.

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Corain, Benedetto, Guenter Schmid, and N. Toshima. Metal Nanoclusters in Catalysis and Materials Science: The Issue of Size Control. Elsevier Science & Technology Books, 2011.

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Book chapters on the topic "Nanocluster size"

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Zhang, Jie, Yunteng He, Lei Lei, Yuzhong Yao, Stephen Bradford, and Wei Kong. "Electron Diffraction of Molecules and Clusters in Superfluid Helium Droplets." In Topics in Applied Physics, 343–79. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94896-2_8.

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AbstractIn an effort to solve the crystallization problem in crystallography, we have been engaged in developing a method termed “serial single molecule electron diffraction imaging” (SS-EDI). The unique features of SS-EDI are superfluid helium droplet cooling and field-induced orientation. With two features combined, the process constitutes a molecular goniometer. Unfortunately, the helium atoms surrounding the sample molecule also contribute to a diffraction background. In this chapter, we analyze the properties of a superfluid helium droplet beam and its doping statistics, and demonstrate the feasibility of overcoming the background issue by using the velocity slip phenomenon of a pulsed droplet beam. Electron diffraction profiles and pair correlation functions of monomer-doped droplets, small cluster and nanocluster -doped droplets are presented. The timing of the pulsed electron gun and the effective doping efficiency under different dopant pressures can both be controlled for size selection. This work clears any doubt of the effectiveness of superfluid helium droplets in SS-EDI, thereby advancing the effort in demonstrating the “proof-of-concept” one step further.
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Zeng, Chenjie, and Rongchao Jin. "Gold Nanoclusters: Size-Controlled Synthesis and Crystal Structures." In Structure and Bonding, 87–115. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/430_2014_146.

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Gill, Ann F., William H. Sawyer, Kamron Salavitabar, Boggavarapu Kiran, and Anil K. Kandalam. "Growth Pattern and Size-Dependent Properties of Lead Chalcogenide Nanoclusters." In Challenges and Advances in Computational Chemistry and Physics, 289–323. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-48918-6_9.

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Li, Z. Y., N. P. Young, M. Di Vece, S. Palomba, R. E. Palmer, A. L. Bleloch, B. C. Curley, R. L. Johnston, J. Jiang, and J. Yuan. "Three-dimensional atomic-scale structure of size-selected nanoclusters on surfaces." In EMC 2008 14th European Microscopy Congress 1–5 September 2008, Aachen, Germany, 133–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-85156-1_67.

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Yao, Hiroshi. "Monolayer-Protected Metal Nanoclusters with Chirality: Synthesis, Size Fractionation, Optical Activity and Asymmetric Transformation." In Handbook of Nanoparticles, 191–216. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-15338-4_12.

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Yao, Hiroshi. "Monolayer-Protected Metal Nanoclusters with Chirality: Synthesis, Size Fractionation, Optical Activity and Asymmetric Transformation." In Handbook of Nanoparticles, 1–22. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13188-7_12-1.

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Tenne, R. "Size Evolution of Nanoclusters: Comparison Between the Phase Diagram and Properties of MO–S and Carbon Nanoparticles." In NATO Science for Peace and Security Series B: Physics and Biophysics, 95–104. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2523-4_8.

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"Nanocluster Nucleation, Growth, and Size Distributions." In Handbook of Nanophysics, 23–34. CRC Press, 2010. http://dx.doi.org/10.1201/9781420075557-7.

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"MULTINUCLEAR, BIMETALLIC NANOCLUSTER CATALYSTS." In Design and Applications of Single-Site Heterogeneous Catalysts, 233–75. IMPERIAL COLLEGE PRESS, 2012. http://dx.doi.org/10.1142/9781848169111_0008.

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Bonačić-Koutecký, Vlasta, Roland Mitrić, Christian Bürgel, and Jens Petersen. "Tailoring Functionality of Clusters and Their Complexes with Biomolecules by Size, Structures, and Lasers." In Nanoclusters - A Bridge across Disciplines, 485–516. Elsevier, 2010. http://dx.doi.org/10.1016/b978-0-444-53440-8.00013-6.

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Conference papers on the topic "Nanocluster size"

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Mondal, Shyamal, and S. R. Bhattacharyya. "Morphology of size-selected copper nanocluster film." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710214.

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Barman, Pintu, Anindita Deka, Shyamal Mondal, Debasree Chowdhury, and S. R. Bhattacharyya. "Thermal diffusion driven Island formation and fragmentation of size-selected Ag-nanocluster films." In DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113145.

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Barman, Pintu, Anindita Deka, and S. R. Bhattacharyya. "Evolution from mono-dispersed to mound-like structures of size-selected Ag-nanocluster films." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016653.

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Mahboobi, S. H., A. Meghdari, N. Jalili, and F. Amiri. "Qualitative Study of Nanocluster Positioning Process: 2D Molecular Dynamics Simulations." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66049.

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One of the key factors in the assembly of nanoclusters is the precise positioning of them by a manipulation system. Currently the size of clusters used as building blocks is shrinking down to a few nanometers. In such cases, the particle nature of matter plays an important role in the manipulator/cluster/substrate interactions. Having a deeper insight to the aforementioned nanoscale interactions is crucial for prediction and understanding of the behavior of nanoclusters during the positioning process. In the present research, 2D molecular dynamics simulations have been used to investigate such behaviors. Performing planar simulations can provide a fairly acceptable qualitative tool for our purpose while the computation time is greatly reduced in comparison to 3D simulations. The system consists of a tip, cluster and substrate. The focus of the present research is on ultra-fine metallic nanoclusters. To perform this research, Nose-Hoover dynamics and Sutton-Chen interatomic potential will be used to investigate the behavior of the above system which is made from different transition metals. The effects of material type, tip form and manipulation strategy on the success of the process have been investigated by planar molecular dynamics. Such qualitative simulation studies can evaluate the chance of success of a certain nanopositioning scenario regarding different working conditions before consuming large-scale computation time or high experimental expenses.
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Saikia, Rhituraj, P. K. Kalita, M. R. Singh, and R. H. Lipson. "Quantum Size Effects In Chemically Synthesized CdS Nanoclusters." In TRANSPORT AND OPTICAL PROPERTIES OF NANOMATERIALS: Proceedings of the International Conference—ICTOPON-2009. AIP, 2009. http://dx.doi.org/10.1063/1.3183462.

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Montone, Georgia R., Eric Hermann, and Anil K. Kandalam. "Interaction of size-selected gold nanoclusters with dopamine." In International Symposium on Clusters and Nanomaterials, edited by Puru Jena and Anil K. Kandalam. SPIE, 2016. http://dx.doi.org/10.1117/12.2267738.

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Ayesh, Ahmad. "Production Of Size-selected Copper Nanoclusters For Petroleum Refinery Applications." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2014. http://dx.doi.org/10.5339/qfarc.2014.eepp0580.

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Mokry, C. R., P. J. Simpson, and A. P. Knights. "Size distribution of silicon nanoclusters determined by transmission electron microscopy." In 2008 5th IEEE International Conference on Group IV Photonics. IEEE, 2008. http://dx.doi.org/10.1109/group4.2008.4638168.

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FISENKO, S. P., and A. V. LUIKOV. "MAXIMUM OF INFORMATION ENTROPY AND SIZE DISTRIBUTION FUNCTION OF NANOCLUSTERS." In Reviews and Short Notes to Nanomeeting-2005. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701947_0048.

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Park, Y. H., and I. Hijazi. "Properties of Bimetallic Core-Shell Nanoclusters." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78242.

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Gold (Au) and copper (Cu) materials and their combination exhibit the most of the main wanted properties in nanostructures. Nobel metals such as Au and Cu have important magnetic, electronic, optical, catalytic and thermal properties. Compared to monometallic clusters, bimetallic nanoclusters have more degrees of freedom and distinct properties due to the presence of two different metals. It is also well known that the shape, surface topography, segregation, mixing, ordering, energetic stability, and electronic structures of bimetallic nanoclusters may depend significantly on their composition. This affords greater opportunity to control their properties by modifying composition as well as size. In this work, we investigated magnetic and electronic properties for AuCu bimetallic core-shell structures and showed that the CuAu coreshell can have a half-metal property through chemical composition modification. Half-metallic ferromagnets attract increasing research interest as potential materials for spintronic device applications.
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