Academic literature on the topic 'Photoluminescent semiconductor nanocrystals'

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Journal articles on the topic "Photoluminescent semiconductor nanocrystals"

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Roland Menzel, E., Steve M. Savoy, Sydney J. Ulvick, Kwan H. Cheng, Russell H. Murdock, and Mark R. Sudduth. "Photoluminescent Semiconductor Nanocrystals for Fingerprint Detection." Journal of Forensic Sciences 45, no. 3 (2000): 14727J. http://dx.doi.org/10.1520/jfs14727j.

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Marin, Brandon C., Su-Wen Hsu, Li Chen, et al. "Plasmon-Enhanced Two-Photon Absorption in Photoluminescent Semiconductor Nanocrystals." ACS Photonics 3, no. 4 (2016): 526–31. http://dx.doi.org/10.1021/acsphotonics.6b00037.

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Martin-Trasanco, Rudy, Hilda Esparza-Ponce, Pedro Ortiz та ін. "In-Situ Preparation of CdTe Quantum Dots Capped with a β-Cyclodextrin-Epichlorohydrin Polymer: Polymer Influence on the Nanocrystal’s Optical Properties". Nanomaterials 8, № 11 (2018): 948. http://dx.doi.org/10.3390/nano8110948.

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β-Cyclodextrin (βCD), the less water soluble of the cyclodextrins, has been used as a capping agent in the preparation of semiconductor nanocrystals or quantum dots (QDs). Nevertheless, no reports have been found in the use of the highly water-soluble polymer of this, prepared by the crosslinking of the βCD units with epichlorohydrin in basic medium (βCDP). This polymer, besides to overcome the low solubility of the βCD, increases the inclusion constant of the guest; two parameters that deserve its use as capping agent, instead of the native cyclodextrin. In the present manuscript, we afforded
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Guzatov, Dmitry V., Sergey V. Gaponenko, and Hilmi V. Demir. "Colloidal Photoluminescent Refractive Index Nanosensor Using Plasmonic Effects." Zeitschrift für Physikalische Chemie 232, no. 9-11 (2018): 1431–41. http://dx.doi.org/10.1515/zpch-2018-1127.

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Abstract Fluorescence enhancement by metal nanostructures which is sensitive to refractive index n of an ambient medium is suggested as an operation principle of a novel refractive index sensor for liquids. Calculations are made for spherical and spheroidal Ag particles, and potential feasibility of sensitivity of the order of Δn=10−4 is demonstrated. Sensors of this type can be made fully colloidal with metal bodies deposited on a substrate or comprising a metal layer covering colloidal assembly of dielectric particles to serve as a test strip as well as placed on a fiber tip end to get local
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Nifontova, Galina, Victor Krivenkov, Mariya Zvaigzne, et al. "Nanoparticle-Doped Hybrid Polyelectrolyte Microcapsules with Controlled Photoluminescence for Potential Bioimaging Applications." Polymers 13, no. 23 (2021): 4076. http://dx.doi.org/10.3390/polym13234076.

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Fluorescent imaging is widely used in the diagnosis and tracking of the distribution, interaction, and transformation processes at molecular, cellular, and tissue levels. To be detectable, delivery systems should exhibit a strong and bright fluorescence. Quantum dots (QDs) are highly photostable fluorescent semiconductor nanocrystals with wide absorption spectra and narrow, size-tunable emission spectra, which make them suitable fluorescent nanolabels to be embedded into microparticles used as bioimaging and theranostic agents. The layer-by-layer deposition approach allows the entrapping of QD
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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 (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
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Pashchenko, G. A. "PHOTOLUMINESCENCE OF NANOCRYSTALLINE CdTe, INTRODUCED INTO POROUS SILICON." Optoelektronìka ta napìvprovìdnikova tehnìka 56 (December 7, 2021): 123–28. http://dx.doi.org/10.15407/iopt.2021.56.123.

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A method of colloidal synthesis of monodisperse nanocrystals (NC) with high stability, narrow bands of photoluminescence (PL) and high quantum yield has been developed. The process of colloidal synthesis took place at room temperature and for the passivation of NC used a variety of surfactants. The surface of NC CdTe was modified by introducing them into a matrix, organic or crystalline. In our case, the matrix was porous Silicon (PS), that is a composite structure was formed on the basis of the matrix and NC semiconductor. Nanocomposite structures of PS – NC CdTe were obtained by introducing
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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 (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 f
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Ding, Yong Ling, Hua Dong Sun, Kang Ning Sun, and Fu Tian Liu. "Water-Based Route to Synthesis of High-Quality UV-Blue Photoluminescing ZnSe/ZnS Core/Shell Quantum Dots and their Physicochemical Characterization." Key Engineering Materials 680 (February 2016): 553–57. http://dx.doi.org/10.4028/www.scientific.net/kem.680.553.

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Epitaxially overgrowing a semiconductor material with higher bandgap around the QDs has proven to be a crucial approach for improving the PL efficiency and stability of nanocrystals. In this paper, a ZnS shell was deposited around ZnSe nanocrystal cores via a noninjection approach in aqueous media. The deposition procedure conducted at 100°C in a reaction flask in the presence of the shell precursor compounds, together with the crude ZnSe nanocrystal cores and the thiol ligand glutathione. The influences of various experimental variables, including the reaction time, amount of thiourea, as wel
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Sercel, Peter C., Andrew Shabaev, and Alexander L. Efros. "Symmetry Breaking Induced Activation of Nanocrystal Optical Transitions." MRS Advances 3, no. 14 (2018): 711–16. http://dx.doi.org/10.1557/adv.2018.19.

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ABSTRACTWe have analysed the effect of symmetry breaking on the optical properties of semiconductor nanocrystals due to doping by charged impurities. Using doped CdSe nanocrystals as an example, we show the effects of a Coulomb center on the exciton fine-structure and optical selection rules using symmetry theory and then quantify the effect of symmetry breaking on the exciton fine structure, modelling the charged center using a multipole expansion. The model shows that the presence of a Coulomb center breaks the nanocrystal symmetry and affects its optical properties through mixing and shifti
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Dissertations / Theses on the topic "Photoluminescent semiconductor nanocrystals"

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Ho, Minh Q. "Colloidal Synthesis and Optical Characterizations of Semiconductor Nanocrystals from Nontoxic Elements." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3915.

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To date, the search efforts have shifted from the toxic II-VI, III-V and IV-VI semiconductors to more environmentally friendly materials. Among Group II-V semiconductors, Zn3P2 has shown to be a more benign option, similar to Group IV (Ge, Si) materials, for future applications in photovoltaics and optoelectronics. This work is dedicated to the development of wet-chemical synthetic routes of (1) Zn3P2 and (2) Group IV (Ge, Si, Si1-xGex) nanocrystals with precise control over composition, crystal structure, size and dispersity by adjusting different reaction parameters such as temperature, time
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Urgessa, Zelalem Nigussa. "Growth and characterization of ZnO nanorods using chemical bath deposition." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1021124.

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Semiconductor devices are commonplace in every household. One application of semiconductors in particular, namely solid state lighting technology, is destined for a bright future. To this end, ZnO nanostructures have gained substantial interest in the research community, in part because of its requisite large direct band gap. Furthermore, the stability of the exciton (binding energy 60 meV) in this material, can lead to lasing action based on exciton recombination and possibly exciton interaction, even above room temperature. Therefore, it is very important to realize controllable growth of Zn
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Serincan, Ugur. "Formation Of Semiconductor Nanocrystals In Sio2 By Ion Implantation." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605016/index.pdf.

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In this study, we used ion implantation technique to synthesize semiconductor (Ge, Si) nanocrystals in SiO2 matrix. Ge and Si nanocrystals have been successfully formed by Ge and Si implantation and post annealing. Implanted samples were examined by characterization techniques such as TEM, XPS, EDS, SAD, SIMS, PL, Raman and FTIR spectroscopy and the presence of Ge and Si nanocrystals in the SiO2 matrix has been evidenced by these measurements. It was shown that implantation dose, implantation energy, annealing temperature, annealing time and annealing ambient are important parameters for the f
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Ma, Xuedan [Verfasser], and Alf [Akademischer Betreuer] Mews. "Manipulation of Photoluminescence from Semiconductor Nanocrystals by Bandgap Engineering and Surface Plasmons / Xuedan Ma. Betreuer: Alf Mews." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2011. http://d-nb.info/1020418745/34.

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Leubner, Susanne. "On the ligand shell complexity of strongly emitting, water-soluble semiconductor nanocrystals." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-163298.

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Colloidal semiconductor nanocrystals (NCs) have attracted a great deal of interest as bright and stable chromophores for a variety of applications. Their superior physicochemical properties depend on characteristics of the inorganic core, as well as on the chemical nature and structure of the stabilizing organic ligand shell. To evaluate the promising material, a thorough knowledge of structure-property relationships is still demanded. The present work addresses this challenge to three water-soluble NC systems, namely thiol-capped CdTe, thiol-capped CdHgTe, and DNA-functionalized CdTe NCs wit
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Pedetti, Silvia. "Synthesis and optical properties of II-VI colloidal two-dimensional nanocrystals : homo- and hetero-structures." Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066755.

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Ces travaux de thèse ont porté sur une nouvelle classe de semi-conducteurs colloïdaux sous forme de nanoplaquettes composées de chalcogénures de cadmium. Ces nanocristaux, comparables à des puits quantiques, présentent un confinement excitonique dans une seule direction, l’épaisseur, qui est contrôlée au niveau atomique. Les nanoplaquettes sont caractérisées par une excellente résolution spectrale et de bons rendements quantiques. Par conséquence, elles représentent de potentiels candidats pour développer des dispositifs optoélectroniques comme des diodes électroluminescentes ou bien des photo
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Ramanathan, Swati. "Polarization Studies of Coupled Quantum Dots." Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1194984001.

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Flores, Yesica. "Hybrid semiconducting nanoplatelets : synthesis and molecule-driven assembly." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS464.

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Ce doctorat avait pour objet l’exploration des propriétés chimiques de nanoplaquettes de séléniure de cadmium en les fonctionnalisant par des complexes paramagnétiques de coordination. En effet, l’association des propriétés magnétiques des complexes avec les propriétés optiques très originales de ces objets pourrait conduire à la découverte de nouvelles propriétés magnéto-optiques. Cette thèse, en cohérence avec des résultats récents de la littérature, a confirmé que la forme plaquettaire de ces nano-objets induisait leur empilement lorsqu’ils sont recouverts de ligands appropriés et dispersés
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Shiman, Dmitriy I., Vladimir Sayevich, Christian Meerbach, et al. "Robust Polymer Matrix Based on Isobutylene (Co)polymers for Efficient Encapsulation of Colloidal Semiconductor Nanocrystals." American Chemical Association, 2019. https://tud.qucosa.de/id/qucosa%3A74322.

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We introduce new oxygen- and moisture-proof polymer matrixes based on polyisobutylene (PIB) and its block copolymer with styrene [poly(styrene-block-isobutylene-blockstyrene), PSt-b-PIB-b-PSt] for the encapsulation of colloidal semiconductor nanocrystals. In order to prepare transparent and processable composites, we developed a special procedure of nanocrystal surface engineering including ligand exchange of parental organic ligands to inorganic species followed by the attachment of specially designed short-chain PIB functionalized with an amino group. The latter provides excellent compatibil
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Monahan, Bradley Michael. "Synthesis and Characterization of Phase-pure Copper Zinc Tin Sulfide (Cu2ZnSnS4) Nanoparticles." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1404732007.

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Book chapters on the topic "Photoluminescent semiconductor nanocrystals"

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Gangopadhyay, P. "Optical, Photoluminescence, and Vibrational Spectroscopy of Metal Nanoparticles." In Semiconductor Nanocrystals and Metal Nanoparticles. CRC Press, 2016. http://dx.doi.org/10.1201/9781315374628-5.

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Huy, P. T., and P. H. Duong. "Intense Photoluminescence and Photoluminescence Enhancement of Silicon Nanocrystals by Ultraviolet Irradiation." In Semiconductor Photonics: Nano-Structured Materials and Devices. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-471-5.74.

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Xu, Zhihua, and Mircea Cotlet. "Probing Photoluminescence Dynamics in Colloidal Semiconductor Nanocrystal/Fullerene Heterodimers with Single Molecule Spectroscopy." In UV-VIS and Photoluminescence Spectroscopy for Nanomaterials Characterization. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-27594-4_15.

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Filonovich, Sergey A., Yurii P. Rakovich, Mikhail I. Vasilevskiy, et al. "Probing the Exciton Density of States in Semiconductor Nanocrystals Using Integrated Photoluminescence Spectroscopy." In Nanostructured Materials. Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-6740-3_15.

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Conference papers on the topic "Photoluminescent semiconductor nanocrystals"

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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. 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
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Klimov, Victor I., and Vladimir A. Karavanskii. "Ultrafast Optical Nonlinearities in CuxS Nanocrystals." In Nonlinear Optics: Materials, Fundamentals and Applications. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/nlo.1996.nthe.17.

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Three-dimensional (3D) carrier confinement in semiconductor nanocrystals (NC's) results in size-dependent photoluminescence and absorption spectra and significantly modifies the nonlinear optical properties and carrier dynamics with respect to those in bulk materials. So far, most experimental and theoretical studies have concentrated on NC's formed by direct-gap II-VI semiconductors such as CdS and CdSe. Recently, we reported the preparation, linear and picosecond nonlinear transmission of NC's of a new type: NC's formed by different copper sulfide phases [1]. Depending on the copper deficien
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Mei, Guang, Scott Carpenter, An Tu, L. E. Felton, and P. D. Persans. "Electron-hole effective mass in CdSxSe1-x semiconductor nanocrystals." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.wl28.

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We report results of a study of the electron-hole effective mass in CdS x Se1-x nanocrystals embedded in a glass matrix. By varying annealing temperature and growth times, we obtained a series of samples with various crystallite sizes from 40 to 200 Å. Raman experiments and transmission electron microscopy were carried out to determine the composition and crystallite diameter of the semiconductor dots, respectively. The compositions of the semiconductor nanocrystals were found to be independent of particle size so the absorption peak position is solely due to the size. Electromodulation, absor
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KULAKOVICH, O. S., M. V. ARTEMYEV, A. YAROSHEVICH, and S. MASKEVICH. "ENHANCED PHOTOLUMINESCENCE OF SEMICONDUCTOR NANOCRYSTALS NEAR METAL COLLOIDS." In Physics, Chemistry and Application of Nanostructures - Reviews and Short Notes to Nanomeeting 2003. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812796738_0028.

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Klimov, Victor I., and Duncan W. McBranch. "Ultrafast Optical Nonlinearities and Carrier Dynamics in Direct- and Indirect-Gap Semiconductor Nanocrystals." In Chemistry and Physics of Small-Scale Structures. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/cps.1997.ctua.3.

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Semiconductor nanocrystals (NCs) exhibit large and fast optical nonlinearities, and efficient photo- and electroluminescence that make them promising materials for applications in optoelectronics and ultrafast optical switching. The nonlinear optical and luminescent properties of NCs are significantly affected by carrier dynamics. Carrier trapping and a nonradiative Auger process are believed to play a major role in the early stages of carrier relaxation, resulting in ultrafast picosecond and subpicosecond dynamics measured in femtosecond pump-probe, photoluminescence (PL) up-conversion, and p
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Vandyshev, E. N., G. A. Kachurin, and K. S. Zhuravlev. "Effect of external electric field on photoluminescence of silicon nanocrystals." In PHYSICS OF SEMICONDUCTORS: 28th International Conference on the Physics of Semiconductors - ICPS 2006. AIP, 2007. http://dx.doi.org/10.1063/1.2730262.

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Simoes Gamboa, A. L., and E. N. Bodunov. "Functions for Describing Nonexponential Photoluminescence Decay Kinetics in Semiconductor Nanocrystals." In 2022 International Conference Laser Optics (ICLO). IEEE, 2022. http://dx.doi.org/10.1109/iclo54117.2022.9839822.

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Chen, Kok Hao, and Jong Hyun Choi. "Nanoparticle-Aptamer: An Effective Growth Inhibitor for Human Cancer Cells." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11966.

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Semiconductor nanocrystals have unique optical properties due to quantum confinement effects, and a variety of promising approaches have been devised to interface the nanomaterials with biomolecules for bioimaging and therapeutic applications. Such bio-interface can be facilitated via a DNA template for nanoparticles as oligonucleotides can mediate the aqueous-phase nucleation and capping of semiconductor nanocrystals.[1,2] Here, we report a novel scheme of synthesizing fluorescent nanocrystal quantum dots (NQDs) using DNA aptamers and the use of this biotic/abiotic nanoparticle system for gro
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Hamanaka, Yasushi, Masakazu Tsuzuki, Kohei Ozawa, and Toshihiro Kuzuya. "Solution-phase synthesis and photoluminescence characterization of quaternary Cu[sub 2]ZnSnS[sub 4] nanocrystals." In THE PHYSICS OF SEMICONDUCTORS: Proceedings of the 31st International Conference on the Physics of Semiconductors (ICPS) 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4848256.

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Kawanishi, Satoki, Masato Ohmori, Masatoshi Tanaka, and Hiroyuki Sakaki. "Observation of photoluminescence of semiconductor nanocrystal quantum dots in the core of photonic bandgap fiber." In 2006 IEEE LEOS Annual Meeting. IEEE, 2006. http://dx.doi.org/10.1109/leos.2006.279045.

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