Relevant bibliographies by topics / Nanocrystals

Academic literature on the topic 'Nanocrystals'

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Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Nanocrystals"

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Ichiyanagi, Kouhei, Hiroshi Sekiguchi, Tokushi Sato, Shunsuke Nozawa, Ayana Tomita, Manabu Hoshino, Shin-ichi Adachi, and Yuji C. Sasaki. "Cooling dynamics of self-assembled monolayer coating for integrated gold nanocrystals on a glass substrate." Journal of Synchrotron Radiation 22, no. 1 (January 1, 2015): 29–33. http://dx.doi.org/10.1107/s1600577514019730.

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Picosecond time-resolved X-ray diffraction has been used to study the nanoscale thermal transportation dynamics of bare gold nanocrystals and thiol-based self-assembled monolayer (SAM)-coated integrated gold nanocrystals on a SiO2glass substrate. A temporal lattice expansion of 0.30–0.33% was observed in the bare and SAM-coated nanocrystals on the glass substrate; the thermal energy inside the gold nanocrystals was transported to the contacted substrate through the gold–SiO2interface. The interfacial thermal conductivity between the single-layered gold nanocrystal film and the SiO2substrate is estimated to be 45 MW m−2 K−1from the decay of the Au 111 peak shift, which was linearly dependent on the transient temperature. For the SAM-coated gold nanocrystals, the thermal dissipation was faster than that of the bare gold nanocrystal film. The thermal flow from the nanocrystals to the SAM-coated molecules promotes heat dissipation from the laser-heated SAM-coated gold nanocrystals. The thermal transportation of the laser-heated SAM-coated gold nanocrystal film was analyzed using the bidirectional thermal dissipation model.
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Maksimova, G. M., and V. A. Burdov. "Universality of the Förster’s model for resonant exciton transfer in ensembles of nanocrystals." Journal of Chemical Physics 156, no. 16 (April 28, 2022): 164301. http://dx.doi.org/10.1063/5.0085355.

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For nanocrystals in a strong quantum confinement regime, it has been confirmed analytically that resonant exciton transfer proceeds in full accordance with the Förster mechanism. This means that the virtual exciton transitions between the nanocrystals of close sizes are governed only by the dipole–dipole interaction of nanocrystals even in very dense ensembles, while the contributions of all other higher-order multipoles are negligibly small. Based on a simple isotropic model of the envelope function approximation and neglecting the electron–hole interaction inside each nanocrystal, we have computed the rate of the resonant exciton transfer between two nanocrystals. Using the obtained result, we have estimated, for some arbitrarily chosen nanocrystal, the total rate of the exciton non-radiative annihilation caused by the possibility of its resonant virtual transitions into all other nanocrystals of the ensemble. The total rate dependence on the nanocrystal size is determined only by the size distribution function of nanocrystals in the ensemble.
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Cheng, Zhongyao, Yumei Lian, Zul Kamal, Xin Ma, Jianjun Chen, Xinbo Zhou, Jing Su, and Mingfeng Qiu. "Nanocrystals Technology for Pharmaceutical Science." Current Pharmaceutical Design 24, no. 21 (October 15, 2018): 2497–507. http://dx.doi.org/10.2174/1381612824666180518082420.

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Background: Nanocrystals technology is a promising method for improving the dissolution rate and enhancing the bioavailability of poorly soluble drugs. In recent years, it has been developing rapidly and applied to drug research and engineering. Nanocrystal drugs can be formulated into various dosage forms. Objective: This review mainly focused on the nanocrystals technology and its application in pharmaceutical science. Firstly, different preparation methods of nanocrystal technology and the characterization of nanocrystal drugs are briefly described. Secondly, the application of nanocrystals technology in pharmaceutical science is mainly discussed followed by the introduction of sustained release formulations. Then, the scaling up process, marketed nanocrystal drug products and regulatory aspects about nanodrugs are summarized. Finally, the specific challenges and opportunities of nanocrystals technology for pharmaceutical science are summarized and discussed. Conclusion: This review will provide a comprehensive guide for scientists and engineers in the field of pharmaceutical science and biochemical engineering.
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Shen, Hao, Huabao Shang, Yuhan Gao, Deren Yang, and Dongsheng Li. "Efficient Sensitized Photoluminescence from Erbium Chloride Silicate via Interparticle Energy Transfer." Materials 15, no. 3 (January 30, 2022): 1093. http://dx.doi.org/10.3390/ma15031093.

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In this study, we prepare Erbium compound nanocrystals and Si nanocrystal (Si NC) co-embedded silica film by the sol-gel method. Dual phases of Si and Er chloride silicate (ECS) nanocrystals were coprecipitated within amorphous silica. Effective sensitized emission of Er chloride silicate nanocrystals was realized via interparticle energy transfer between silicon nanocrystal and Er chloride silicate nanocrystals. The influence of density and the distribution of sensitizers and Er compounds on interparticle energy transfer efficiency was discussed. The interparticle energy transfer between the semiconductor and erbium compound nanocrystals offers some important insights into the realization of efficient light emission for silicon-based integrated photonics.
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Basa, P., G. Molnár, L. Dobos, B. Pécz, L. Tóth, A. L. Tóth, A. A. Koós, L. Dózsa, Á. Nemcsics, and Zs J. Horváth. "Formation of Ge Nanocrystals in SiO2 by Electron Beam Evaporation." Journal of Nanoscience and Nanotechnology 8, no. 2 (February 1, 2008): 818–22. http://dx.doi.org/10.1166/jnn.2008.a122.

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Ge nanocrystals were formed by electron beam evaporation on SiO2 covered Si substrates. The size and distribution of the nanocrystals were studied by atomic force microscopy, scanning electron microscopy and cross-sectional transmission electron microscopy. Dependencies of the nanocrystal size, of the nanocrystal surface coverage, and sheet resistance obtained by van der Pauw method of the Ge layer have been found on the evaporation time. The suggested growth mechanism for the formation of nanocrystals is the Volmer-Weber type. The sheet resistance exhibited a power dependence on the nanocrystal size.
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Mohammadrezaee, Mohammad, Naser Hatefi-Kargan, and Ahmadreza Daraei. "Enhancing crystal quality and optical properties of GaN nanocrystals by tuning pH of the synthesis solution." Zeitschrift für Naturforschung A 75, no. 6 (May 26, 2020): 551–56. http://dx.doi.org/10.1515/zna-2019-0378.

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AbstractGallium nitride nanocrystals as a wide bandgap semiconductor material for optoelectronic applications can be synthesized using chemical methods. In this research using co-precipitation and nitridation processes gallium nitride nanocrystals have been synthesized, and by tuning pH of the synthesis solution at the co-precipitation step, crystal quality and optical property of the resultant gallium nitride nanocrystals have been enhanced. Gallium nitride nanocrystal samples were synthesized using solutions with pH values of 2.1, 4.8, 7.8, and 9.0, and then nitridation at 950 °C under the flow of ammonia gas. The synthesized nanocrystal samples were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and photoluminescence techniques. The XRD data show that the nanocrystals have hexagonal wurtzite crystal structure, and using Scherer’s equation the sizes of the synthesized nanocrystals are 23.6, 26.6, 19.7, and 10.4 nm for the samples synthesized using the solutions with pH values of 2.1, 4.8, 7.8, and 9.0 respectively. The sizes of the nanocrystals obtained from SEM images are larger than the values obtained using Scherer’s equation, due to the aggregation of nanocrystals. EDX spectra show that pH of the synthesis solution affects the elemental stoichiometry of the gallium nitride nanocrystals. We obtained better stoichiometry for the nanocrystal sample synthesized using solution with the pH of 4.8. Photoluminescence spectra show that for this sample the emission intensity is higher than the others.
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Natrayan, L., P. V. Arul Kumar, S. Kaliappan, S. Sekar, Pravin P. Patil, R. Jayashri, and E. S. Esakki Raj. "Analysis of Incorporation of Ion-Bombarded Nickel Ions with Silicon Nanocrystals for Microphotonic Devices." Journal of Nanomaterials 2022 (August 16, 2022): 1–7. http://dx.doi.org/10.1155/2022/5438084.

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Nanotechnology is playing a greater role in biomedical engineering. Microphotonic technology is on another side, having faster growth with more requirements. The nanocrystals are a part of nanotechnology which uses silicon for manufacturing. These silicon nanocrystals have the optical property mostly used in microphotonic devices. Silicon nanocrystals are of biocompatibility with less toxicity. Therefore, the advancement in the silicon nanocrystal helps develop more microphotonic devices for biological purposes. One critical factor of silicon nanocrystal is the surface defects or surface imperfections. Surface passivation is the method employed for rectifying this disadvantage of silicon nanocrystal. Another major thing is that silicon nanocrystals are size dependent. So proper variation on the surface is required for yielding high performance of the nanocrystal. After characterizing the surface of the silicon nanocrystal, ion bombardment can occur. Nickel is a lustrous white chemical element which is less reactive when it is of a smaller size. So ion bombardment of nickel ion on the surface of the silicon nanocrystal can be done to improvise the performance of the microphotonic devices. Nearly there is an excess of 20 a.u. of photoluminescence intensity yielded. The relative fluorescence is also increased by 150 a.u. This research work enhanced the silicon nanocrystal using ion bombardment of nickel ion, which increased energy traps resulting in more intensities.
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Kotian, Vinith, Marina Koland, and Srinivas Mutalik. "Nanocrystal-Based Topical Gels for Improving Wound Healing Efficacy of Curcumin." Crystals 12, no. 11 (November 3, 2022): 1565. http://dx.doi.org/10.3390/cryst12111565.

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Topical curcumin shows poor local availability because of its low aqueous solubility and inadequate tissue absorption. Curcumin nanocrystals were prepared by sonoprecipitation followed by lyophilization to improve surface area and solubility. The formulation was optimized by the Design of Experiment (DoE) approach. The nanocrystals were characterized for particle size, zeta potential, polydispersity index, scanning electron microscopy (SEM), powder x-ray diffraction (PXRD), practical yield and in vitro drug release studies. The nanocrystal-incorporated gel was evaluated for drug content, ex vivo permeation, in vivo skin irritation, and in vivo wound healing activity. Time of sonication and amplitude influenced the optimization of curcumin nanocrystals, but the effect of stabilizer concentrations was not significant beyond 0.5% w/w. SEM images of curcumin nanocrystals revealed irregular and plate-shaped particles with rough surfaces. PXRD patterns of curcumin nanocrystals showed low crystallinity compared to unprocessed curcumin powder. An in vitro drug release study demonstrated significant improvement in the percentage cumulative drug release in the form of nanocrystals compared to the unprocessed curcumin, and the release profile exhibited first-order kinetics. Curcumin nanocrystal gel showed 93.86% drug content and was free of skin irritation potential. Excision wound healing activity in albino rats showed that the curcumin nanocrystal gel exhibited significantly faster wound contraction than curcumin powder-incorporated gel.
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Wang, Yu, Xinxing Peng, Alex Abelson, Penghao Xiao, Caroline Qian, Lei Yu, Colin Ophus, et al. "Dynamic deformability of individual PbSe nanocrystals during superlattice phase transitions." Science Advances 5, no. 6 (June 2019): eaaw5623. http://dx.doi.org/10.1126/sciadv.aaw5623.

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The behavior of individual nanocrystals during superlattice phase transitions can profoundly affect the structural perfection and electronic properties of the resulting superlattices. However, details of nanocrystal morphological changes during superlattice phase transitions are largely unknown due to the lack of direct observation. Here, we report the dynamic deformability of PbSe semiconductor nanocrystals during superlattice phase transitions that are driven by ligand displacement. Real-time high-resolution imaging with liquid-phase transmission electron microscopy reveals that following ligand removal, the individual PbSe nanocrystals experience drastic directional shape deformation when the spacing between nanocrystals reaches 2 to 4 nm. The deformation can be completely recovered when two nanocrystals move apart or it can be retained when they attach. The large deformation, which is responsible for the structural defects in the epitaxially fused nanocrystal superlattice, may arise from internanocrystal dipole–dipole interactions.
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Liu, Jie, Rui Zhang, Meiyu Ci, Shuying Sui, and Ping Zhu. "Sodium alginate/cellulose nanocrystal fibers with enhanced mechanical strength prepared by wet spinning." Journal of Engineered Fibers and Fabrics 14 (January 2019): 155892501984755. http://dx.doi.org/10.1177/1558925019847553.

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Sodium alginate/cellulose nanocrystal fibers were prepared using a wet spinning method to enhance the mechanical strength of sodium alginate fibers. Cellulose nanocrystals were prepared by sulfuric acid hydrolysis method. The particle diameter size was measured, and the morphology of cellulose nanocrystals was characterized by transmission electron microscopy and scanning electron microscopy. The structure and mechanical properties of sodium alginate/cellulose nanocrystal fibers were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and mechanical strength testing. The incorporation of cellulose nanocrystals significantly improved the strength of alginate fibers because of the uniform distribution of cellulose nanocrystals in the alginate matrix. The tensile strength and elongation at break of the alginate fibers increased from 1.54 to 2.05 cN/dtex and from 8.29% to 15.05% with increasing cellulose nanocrystals content from 0 to 2 wt%, respectively.
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Dissertations / Theses on the topic "Nanocrystals"

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Harfenist, Steven A. "Structure and characterization of passivated inorganic nanocrystals and three dimensional nanocrystal arrays." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/30776.

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Vezmar, Igor. "From fullerenes to nanocrystals and nanocrystal arrays : novel preparation and characterization methods." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/30897.

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AKKERMAN, QUINTEN ADRIAAN. "Lead Halide Perovskite Nanocrystals: A New Age of Semiconductive Nanocrystals." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/941201.

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This thesis will mainly focus on the synthesis and characterization of colloidal lead halide perovskite (LHP) nanocrystals (NCs). It will also shed light on many synthetic aspects of these NCs, such as their size, shape and compositional control, as well as on how to increase their stability and processability, allowing the use of LHP NCs in devices. Furthermore, this thesis will present several nano-scaled reactions using lead halide NCs, which result in so-called “nanocrystal transformations”. To bridge the gap between the fundamental synthetic work and the application of these NCs, several proof-of-principle devices have been made with LHP NCs, including solar cells and LEDs and will all be demonstrated herein. Finally, several new halide based NCs have been synthesized and will be discusses, broadening the scope of this work not only to LHP NCs, but also to halide based NCs in general.
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Murphy, James Edward. "Semiconductor nanocrystals and nanocrystal arrays: Synthesis, characterization, and time-resolved terahertz spectroscopy photoconductivity measurements." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3207726.

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Choi, Angela On Ki. "Fluorescent nanocrystals for bioimaging." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114126.

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Optical imaging based on fluorescence has yet to be introduced as a clinical diagnostic tool due to the lack of reliable, photostable, and highly luminescent fluorophores. Fluorescent nanocrystals, or quantum dots (QDs), are promising alternatives to organic dyes, since QDs are small in size, resistant to photo-bleaching, and have excellent and appropriate optical properties. The main objective of this work is to use QDs for real-time imaging in live animals. Widespread use of QDs in biology is currently limited due to their questionable biocompatibility, and to the fact that some nanocrystals contain heavy metals, which are potentially hazardous, in their cores. In the present studies the mechanisms underlying the toxicity of cadmium telluride QDs was investigated in several stable cell lines. After long-term exposure to QDs, significant morphological and functional changes were observed at the cellular and subcellular levels. We showed that QD-induced toxicity includes the production of reactive oxygen species, peroxidation of membrane lipids, impairment of mitochondrial function, and changes in the genome and epigenome. Understanding how toxic QDs cause damage to the cells is a first step for i) the establishment of protocols to evaluate the safety of other nanomaterials, and ii) the development of new or improved nanocrystals that are non-toxic. We showed that modifications on QD surfaces with small drug molecules (e.g. N-acetylcysteine) or synthetic polymers can significantly decrease their toxicity, and in some cases, even render the QDs non-toxic. Utilizing a non-invasive route (i.e. intranasal) to deliver nano-probes and nano-therapeutics to the brain, we demonstrated the use of near-infrared fluorescence of non-toxic QDs to image cerebral microlesions in live animals. Repeated imaging in vivo allowed for the live monitoring of lesion size in animals; a reduction of lesion size is a measure of the effectiveness of nano-therapeutic interventions. Animals treated with micelle-incorporated nimodipine or minocycline had significantly smaller lesion volumes, and displayed better recovery of motor function. Quantitative evaluation and volume calculations were possible since the QD signal was isolated from autofluorescence and background after fluorescence lifetime gating. Taken together, the results from this work contribute to the development of QDs and fluorescence technology for biomedical imaging in two main ways: 1) by presenting in vitro measures as the first step in the evaluation of nanomaterial safety. 2) by demonstrating the advantages of using near-infrared QDs for non-invasive lifetime imaging in animals with unilateral cortical ischemic microlesions and for the determination of the spatio-temporal reduction of lesions upon nano-therapeutic interventions. These findings support the use of carefully designed and rigorously tested fluorescent QDs for lifetime optical imaging of the brain in experimental animals, and eventually extending to clinical studies.
L'imagerie par fluorescence reste à introduire dans les cabinets médicaux en raison du manque de fluorophores photo-stables, à haute intensité lumineuse, disponibles sur le marché. Les nanocristaux fluorescents ou boîtes quantiques (BQ), représentent une alternative intéressante par rapport aux teintures organiques car les BQ sont très petits, résistants au photoblanchiment et ont d'excellentes propriétés optiques. L'objectif principal de cette étude est d'utiliser les BQ pour une imagerie en temps réel sur les animaux vivants. L'usage étendu des BQ en biologie est limité en raison de leur biocompatibilité discutable et également en raison du fait que quelques nanocristaux sont composés en partie de métaux lourds. Dans cette étude, les mécanismes cellulaires impliquant la toxicité des BQ de cadmium telluride sont examinés. Après une exposition prolongée aux BQ, des modifications morphologiques et fonctionnelles significatives ont été observées à l'échelle cellulaire et infracellulaire. Nous démontrons que la toxicité induite par les BQ peut entrainer la production d'espèces réactives de l'oxygène, la peroxydation des lipides de la membrane biologique, l'altération du fonctionnement mitochondrial mais aussi des changements du génome et de l'épigénome. Comprendre comment les BQ toxiques endommagent les cellules est un premier pas dans l'établissement de protocoles d'évaluation de la sécurité des nanomatériaux et dans le développement de nouveau nanocristaux non-toxiques. Nous démontrons que la modification de la surface des BQ grâce à des médicaments (ex : N-acetylcysteine) ou des polymères synthétiques peut grandement diminuer leur toxicité, et dans quelques cas, peut aussi rendre les BQ non-toxiques. En utilisant de tel BQ non-toxiques, nous effectuons une démonstration de l'utilisation de la fluorescence infrarouge proche pour effectuer des clichés en temps réel de microlésions cérébrales sur des animaux vivants, à l'aide de méthodes non effractives (ex : voie intra-nasale) pour insérer des nano-sondes ou administrer des nano-thérapies au niveau du cerveau. Des imageries répétées permettent de surveiller la taille des lésions sur les animaux, et prouvent l'efficacité des nano-thérapies dans la prévention de l'expansion de la lésion. Les animaux traités par micelles chargées de nimodipine ou de minocycline ont des lésions moins volumineuses et une meilleure récupération de la fonction motrice. Une évaluation quantitative et un calcul de volume ont été possibles car le signal BQ était séparé de l'autofluorescence tissulaire grâce à de la synchronisation d'image fondé sur la durée de vie fluorescence. L'ensemble des résultats de ces études contribue au développement des BQ et des technologies par fluorescence en imagerie biomédicale, et ceci de deux façons : 1) en présentant des résultats in vitro qui constituent une première étape dans l'évaluation de la sécurité des nanomatériaux. 2) en démontrant des avantages de l'utilisation les BQ infrarouges proches pour l'imagerie non effractives sur les animaux vivants avec des lésions cérébrales et pour la détermination de la réduction des lésions après des nano-thérapies. Ces constatations appuient l'utilisation des BQ fluorescentes créés avec soin et ayant subi des essais précliniques rigoureux pour l'imagerie encéphalique in vivo et s'étendant finalement aux études cliniques.
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Williams, Shara Carol. "Patterning nanocrystals using DNA." Berkeley, Calif. : Oak Ridge, Tenn. : Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/825530-PLgXcs/native/.

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Thesis (Ph.D.); Submitted to the University of California at Berkeley, Berkeley, CA (US); 1 Sep 2003.
Published through the Information Bridge: DOE Scientific and Technical Information. "LBNL--55024" Williams, Shara Carol. National Institutes of Health (US) 09/01/2003. Report is also available in paper and microfiche from NTIS.
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Zhang, Jun. "Shape control in synthesis of functional nanocrystals." Diss., Online access via UMI:, 2009.

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Jansons, Adam. "Living Nanocrystals: Synthesis of Precisely Defined Metal Oxide Nanocrystals Through a Continuous Growth Process." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23172.

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Colloidal nanocrystals offer new and improved performance in applications as well as less environmental impact when compared to traditional device fabrication methods. The important properties that enable improved applications are a direct result of nanocrystal structure. While there have been many great advances in the production of colloidal nanocrystals over the past three decades, precise, atomic-level control of the size, composition, and structure of the inorganic core remains challenging. Rather than dictate these material aspects through traditional synthetic routes, this dissertation details the development and exploitation of a colloidal nanocrystal synthetic method inspired by polymerization reactions. Living polymerization reactions offer precise control of polymer size and structure and have tremendously advanced polymer science, allowing the intuitive production of polymers and block co-polymers of well-defined molecular weights. Similarly, living nanocrystal synthetic methods allow an enhanced level of structural control, granting the synthesis of binary, doped, and core/shell nanocrystals of well-defined size, composition, and structure. This improved control in turn grants enhanced nanocrystal property performance and deepens our understanding of structure/property relationships. This dissertation defines living nanocrystal growth and demonstrates the potential of the living methods in the colloidal production of oxide nanocrystals. After a brief introduction, living growth is defined and discussed in the context of synthetic prerequisites, attributes, and outcomes. Living growth is also compared to more traditional colloidal nanocrystal synthetic methods. The following chapters then demonstrate the precise control living approaches offer in three separate studies; the first highlights sub-nanometer control of nanocrystal size from 2-22+ nm in diameter. Next the improvement in nanocrystal composition is illustrated using several transition metal dopants into an oxide nanocrystal matrix at near thermodynamically allowed compositions. Additionally, precise radial dopant placement is demonstrated, which has striking implications for material properties. The radial position of tin in tin-doped indium oxide nanocrystals and the resulting differences on the localized surface plasmon resonance are discussed. Finally, future opportunities are reviewed. This dissertation includes previously published co-authored material.
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Yerci, Selcuk. "Spectroscopic Characterization Of Semiconductor Nanocrystals." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608177/index.pdf.

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Semiconductor nanocrystals are expected to play an important role in the development of new generation of microelectronic and photonic devices such as light emitting diodes and memory elements. Optimization of these devices requires detailed investigations. Various spectroscopic techniques have been developed for material and devices characterization. This study covers the applications of the following techniques for the analysis of nanocrystalline materials: Fourier Transform Infrared Spectroscopy (FTIR), Raman Spectroscopy, X-Ray Diffraction (XRD) and X-Ray Photoelectron (XPS). Transmission Electron Microscopy (TEM) and Secondary Ion Mass Spectrometry (SIMS) are also used as complementary methods. Crystallinity ratio, size, physical and chemical environment of the nanostructures were probed with these methods. Si and Ge nanocrystals were formed into the oxides Al2O3 and SiO2 by ion implantation, magnetron sputtering and laser ablation methods. FTIR and XPS are two methods used to extract information on the surface of the nanocrystals. Raman and XRD are non destructive and easy-to-operate methods used widely to estimate the crystallinity to amorphous ratio and the sizes of the nanocrystals. In this study, the structural variations of SiO2 matrix during the formation of Si nanocrystals were characterized by FTIR. The shift in position and changes in intensity of the Si-O-Si asymmetric stretching band of SiOx was monitored. An indirect metrology method based on FTIR was developed to show the nanocrystal formation. Ge nanocrystals formed in SiO2 matrix were investigated using FTIR, Raman and XRD methods. FTIR spectroscopy showed that Ge atoms segregate completely from the matrix at relatively low temperatures 900 oC. The stress between the Ge nanocrystals and the matrix can vary in samples produced by magnetron sputtering if the production conditions are slightly different. Si and Ge nanocrystals were formed into Al2O3 matrix by ion implantation of Si and Ge ions into sapphire matrix. Raman, XRD, XPS and TEM methods were employed to characterize the formed nanocrystals. XRD is used to estimate the nanocrystal sizes which are in agreement with TEM observations. The stress on nanocrystals was observed by Raman and XRD methods, and a quantitative calculation was employed to the Si nanocrystals using the Raman results. XPS and SIMS depth profiles of the sample implanted with Si, and annealed at 1000 oC were measured. Precipitation of Si atoms with the heat treatment to form the nanocrystals was observed using XPS. The volume fraction of the SiOx shell to the Si core in Si nanocrystals was found to be 7.9 % at projection range of implantation.
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Kudera, Stefan. "Formation of Colloidal Semiconductor Nanocrystals." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-77315.

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Books on the topic "Nanocrystals"

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Koczkur, Kallum M., Sara E. Skrabalak, and Michelle L. Personick. Metal Nanocrystals. Washington, DC, USA: American Chemical Society, 2020. http://dx.doi.org/10.1021/acs.infocus.7e4003.

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Efros, Alexander L., David J. Lockwood, and Leonid Tsybeskov, eds. Semiconductor Nanocrystals. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9.

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Hamad, Wadood Y. Cellulose Nanocrystals. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781118675601.

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Huang, Jin, Peter R. Chang, Ning Lin, and Alain Dufresne, eds. Polysaccharide-Based Nanocrystals. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527689378.

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1954-, Nalwa Hari Singh, ed. Nanoclusters and nanocrystals. Stevenson Ranch, Calif: American Scientific Publishers, 2003.

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1945-, Pileni M. P., ed. Nanocrystals forming mesoscopic structures. Weinheim: Wiley-VCH, 2005.

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Banerjee, Writam. Nanocrystals in Nonvolatile Memory. 2nd ed. New York: Jenny Stanford Publishing, 2024. http://dx.doi.org/10.1201/9781003514862.

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Chen, Tupei, and Yang Liu, eds. Semiconductor Nanocrystals and Metal Nanoparticles. Boca Raton : Taylor & Francis, a CRC title, part of the Taylor &: CRC Press, 2016. http://dx.doi.org/10.1201/9781315374628.

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Peng, X., and D. M. P. Mingos, eds. Semiconductor Nanocrystals and Silicate Nanoparticles. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b11020.

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Rao, M. S. Ramachandra, and Tatsuo Okada, eds. ZnO Nanocrystals and Allied Materials. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-1160-0.

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Book chapters on the topic "Nanocrystals"

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Borrelli, N. F. "Photonic Applications of Semiconductor-Doped Glasses." In Semiconductor Nanocrystals, 1–51. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9_1.

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Efros, Alexander. "Auger Processes in Nanosize Semiconductor Crystals." In Semiconductor Nanocrystals, 52–72. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9_2.

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Klimov, Victor I. "Carrier dynamics, optical nonlinearities, and optical gain in nanocrystal quantum dots." In Semiconductor Nanocrystals, 73–111. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9_3.

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Brunner, Karl, and Artur Zrennert. "Novel Device Applications of Stranski-Krastanov Quantum Dots." In Semiconductor Nanocrystals, 112–51. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9_4.

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Diener, J., N. Künzner, E. Gross, G. Polisski, and D. Kovalev. "Porous Silicon as an Open Dielectric Nanostructure: an Ensemble of Aspheric Silicon Nanocrystals." In Semiconductor Nanocrystals, 152–208. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9_5.

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Tsybeskov, Leonid, and David J. Lockwood. "Nanocrystalline Silicon-Silicon Dioxide Superlattices: Structural and Optical Properties." In Semiconductor Nanocrystals, 209–38. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9_6.

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Norris, David J., and Yurii A. Vlasov. "Quantum Dot Photonic Crystals." In Semiconductor Nanocrystals, 239–60. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9_7.

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Pavesi, Lorenzo, and Rasit Turan. "Introduction." In Silicon Nanocrystals, 1–4. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527629954.ch1.

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Iacona, Fabio, Giorgia Franzò, Alessia Irrera, Simona Boninelli, and Francesco Priolo. "Structural and Optical Properties of Silicon Nanocrystals Synthesized." In Silicon Nanocrystals, 247–73. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527629954.ch10.

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Gourbilleau, Fabrice, Celine Ternon, Christian Dufour, Xavier Portier, and Richard Rizk. "Formation of Si-nc by Reactive Magnetron Sputtering." In Silicon Nanocrystals, 275–95. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527629954.ch11.

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Conference papers on the topic "Nanocrystals"

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Mei, Guang, Scott Carpenter, L. E. Felton, and P. D. Persans. "Size dependence of quantum Stark effect in CdSxSe1-x nanocrystals." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.wt5.

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We report experimental electromodulation results on various sized CdS x Se1- x nanocrystals doped in a glass matrix. The samples were made by heat treatment and annealing of as-received filter glass from Schott. The size of the nanocrystals can be controlled from 40 to 200Å in diameter by annealing time. Transmission electron microscopy and absorption measurements were performed to get the size and volume fraction of semiconductor nanocrystals in the sample. Raman experiments indicated that the samples are CdS0.44Se0.56 and that the composition does not change with nanocrystal size. Electromodulation experiments were performed, and two strong peaks from the quantum-confined excitons were observed.
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Shcheglov, K. V., C. M. Yang, and H. A. Atwater. "Photoluminescence and Electroluminescence of Ge-Implanted Si/SiO2/Si Structures." In Microphysics of Surfaces: Nanoscale Processing. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/msnp.1995.msab3.

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Although it was observation of efficient photoluminescence [PL] from porous silicon that prompted numerous investigations into the optoelectronic properties of group IV semiconductor nanocrystals, there is interest in other related materials which are more robust in various chemical and thermal ambients and which can be easily incorporated into standard silicon VLSI processing. A promising approach that meets the above requisites is synthesis of semiconductor nanocrystals in an SiO2 matrix accomplished by various techniques. In this letter we report on the fabrication of a Ge nanocrystal-based electroluminescent device using ion implantation and precipitation.
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Blanton, Sean A., Ahmad Dehestani, Peter C. Lin, and Philippe Guyot-Sionnest. "Single Nanocrystal Spectroscopy by Two Photon Excitation." In Microphysics of Surfaces: Nanoscale Processing. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/msnp.1995.msaa4.

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Current methods of semiconductor nanocrystal synthesis produce samples which are nearly monodisperse in size. The remaining polydispersity in size, along with possible variations in surface configuration, still introduce an inhomogeneous broadening to most spectroscopic studies. In an effort to eliminate this broadening, we perform spectroscopy on single nanocrystals.
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Lee, Minyung. "Nonlinear Optical Properties of Au Nanocrystals Embedded in Silicate Thin Films." In Nonlinear Optics: Materials, Fundamentals and Applications. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/nlo.1996.nthe.3.

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A lot of nanometer-sized metal particles exhibit high optical nonlinearity and fast time response in the surface plasmon absorption region,1 so they have potential application in nonlinear optical devices in the future. Especially, gold nano crystals were most intensively studied and their linear and nonlinear optical properties are relatively well known.2 However, preparation techniques for gold nano particles in inorganic oxide glass are not well established yet and controlling the nanocrystal size has to be elaborated for the systematic study on the nonlinear optical properties of metal nanocrystals.
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Thantu, N., J. S. Melinger, D. McMorrow, and B. L. Justus. "Femtosecond Nonlinear Optical Response of CuBr and CuCI Nanocrystals in Glass in the Optically Transparent Region." In Nonlinear Optics: Materials, Fundamentals and Applications. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/nlo.1996.nthe.18.

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Because large third-order refractive nonlinearities, γ, are expected, much study on nanocrystal doped glasses has focused on the nonlinear optical properties at or near the single photon resonance.1 Although γ is smaller in the single-photon transparent region, its temporal response is expected to be pulse-width limited. More importantly, since the potential use of these materials as optical devices depends on the figure-of-merit ratio proportional to γ/(ατ or (βτ), where α and β are the linear and nonlinear absorption coefficients, respectively, and τ is the response time, a possibly larger figure of merit in the transparent region warrants studies far from the absorption edge. Recent studies2,3,4 performed on photodarkening CuBr nanocrystal doped glasses in the transparent region indicate a sizable two-photon enhanced nonlinearity which should scale with the concentration of CuBr nanocrystals in the glass. Time-resolving the nonlinear optical response3 with 60 fs, 620 nm optical pulses revealed a nearly pulse-width limited response followed by a subpicosecond decay. The CuBr and CuCI nanocrystals with the band edge in the 370-400 nm region are single-photon-transparent to the 620 nm light, but are two-photon-resonant at this wavelength or at 800 nm, the wavelength of interest in this study.
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Baranov, Dmitry, and Liberato Manna. "Transformations of Cs4PbBr6 Nanocrystals." In Internet NanoGe Conference on Nanocrystals. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.incnc.2021.043.

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Stöferle, Thilo, Etsuki Kobiyama, Gabriele Rainò, Ihor Cherniukh, Yuliia Berezovska, Maryna Bodnarchuk, Rainer Mahrt, and Maksym Kovalenko. "Superfluorescence in Lead Halide Perovskite Nanocrystal Assemblies and Giant Nanocrystals." In International Conference on Emerging Light Emitting Materials. València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.emlem.2022.030.

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Shulenberger, Katherine. "Intrinsic Photocharging in CdS Nanocrystals." In Internet NanoGe Conference on Nanocrystals. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.incnc.2021.064.

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Infante, Ivan. "Ligand Engineering in Colloidal Semiconductor Nanocrystals." In Internet NanoGe Conference on Nanocrystals. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.incnc.2021.046.

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Hyeon, Taeghwan. "Inorganic Nanomaterials for Medicine and Energy." In Internet NanoGe Conference on Nanocrystals. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.incnc.2021.048.

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Reports on the topic "Nanocrystals"

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Bawendi, Moungi. Probing Nanocrystal Optical Properties in the Limit of Single Nanocrystals. Office of Scientific and Technical Information (OSTI), December 2022. http://dx.doi.org/10.2172/1902147.

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Alivisatos, A. P. Ceramic Nanocrystals. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada400094.

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Moler, Kathryn A. Magnetic Properties of Nanocrystals. Fort Belvoir, VA: Defense Technical Information Center, November 2005. http://dx.doi.org/10.21236/ada441687.

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Whetten, Robert L. Nanocrystals on Inert Substrates. Fort Belvoir, VA: Defense Technical Information Center, June 1992. http://dx.doi.org/10.21236/ada251486.

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Williams, Shara Carol. Patterning nanocrystals using DNA. Office of Scientific and Technical Information (OSTI), January 2003. http://dx.doi.org/10.2172/825530.

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Micheel, Christine Marya. Biomolecular Assembly of Gold Nanocrystals. Office of Scientific and Technical Information (OSTI), May 2005. http://dx.doi.org/10.2172/877334.

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Hamad, K. S., R. Roth, and A. P. Alivisatos. Photoemission studies of semiconductor nanocrystals. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/603477.

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First, Phillip N., Robert L. Whetten, and T. Gregory Schaaff. Quantitative tunneling spectroscopy of nanocrystals. Office of Scientific and Technical Information (OSTI), May 2007. http://dx.doi.org/10.2172/1057556.

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Xu, Jun. Preparation of nanocrystals and nanocomposites of nanocrystal-conjugated polymer, and their photophysical properties in confined geometries. Office of Scientific and Technical Information (OSTI), January 2007. http://dx.doi.org/10.2172/1342577.

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Brus, Louis E. Metallic Carbon Nanotubes and Ag Nanocrystals. Office of Scientific and Technical Information (OSTI), March 2014. http://dx.doi.org/10.2172/1121887.

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