quantum dots and quantum rods
SYNTHESIS OF CDTE AND PBS SEMICONDUCTOR QUANTUM DOTS AND
... stabilized CdTe quantum dots 14 2.3.1.2 L-Cysteine stabilized CdTe quantum dots 14 2.3.1.3 CA stabilized CdTe quantum dots 14 2.3.2 Synthesis of water soluble CdHgTe quantum dots ... colloidal quantum dots [8-11] for cell labeling [12], cell tracking [13], in vivo imaging [14] and DNA detection [15, 16] Colloidal quantum dots with a wide range of bio- conjugation and with high quantum ... stabilized quantum dots are better suited for biological applications such as in vitro imaging and in vivo sensor Mercury doped CdTe quantum dots, namely alloyed HgxCd1-xTe quantum dots have also...
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Báo cáo hóa học: " A quantum dots and superparamagnetic nanoparticle-based method for the detection of HPV DNA" ppt
... cancer marker Her2 and other cellular targets with semiconductor quantum dots Nat Biotechnol 2003, 21:41-46 14 Huo Q: A perspective on bioconjugated nanoparticles and quantum dots Colloids Surf ... excited effectively under ultraviolet band, and their maximum emission peak is about 530 nm, which means the resultant quantum dots is fluorescence-active and could be used as a fluorescent probe ... electrophoresis Characterization of quantum dots Figure The UV absorbance spectrum of QDs The comparison between QDs and superparamagnetic nanoparticle-based hybridization and type-specific PCR was analysized...
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Báo cáo hóa học: " One-Pot Synthesis of Biocompatible CdSe/CdS Quantum Dots and Their Applications as Fluorescent Biological Labels" doc
... water-soluble CdSe and CdSe/CdS type-I core–shell QDs with several nanometers in size The one-pot method can provide highquality biocompatible quantum dots without using expensive phosphines and complicated ... the advantages of simpleness, low cost, and green precursor Moreover, the as-received QDs show the tunable and bright PL emission with high quantum yields and high performance as fluorescent biological ... but also the quantum yields of the QDs In our case, the quantum yields of the as-synthesized CdSe cores are around 2–3% In order to passivate their surface trap sites and enhance the quantum yields,...
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Báo cáo hóa học: " Interaction and Cooperative Nucleation of InAsSbP Quantum Dots and Pits on InAs(100) Substrate" ppt
... formation of either quantum wires or quantum dots, or even unique island–pit pairs The islands and pits first grow simultaneously as the layer deposition proceeds Both the island height and the pit depth ... QDs, the pits and dots pits cooperative structure growth on InAs(100) substrates by LPE, as well as the interaction and surface morphology of the dots pits combinations are presented and investigated ... QDs and black points to pits The QDs and pits are clearly visible and quite uniformly distributed over the substrate surface Figures 1b, c and 2b– d show that cooperative nucleation of the dots pits...
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báo cáo khoa học: " Three-dimensional reconstruction of cell nuclei, internalized quantum dots and sites of lipid peroxidation" docx
... green channel, corresponding to the quantum dots, and part (d) shows the blue channel, corresponding to the nucleus The nucleus and cell membrane, on the one hand, have relatively simple shapes, ... number of voxels corresponding to quantum dots is 2856; given the pixel size and slice spacing, the volume of one voxel is 0.02 µm3, so the total volume for the quantum dots is 58.8 µm3, or about 5% ... committee and recommended by the ATCC (American Type Culture Collection) Quantum dots were prepared and characterized as described previously [16] Rat pheochromocytoma (PC12 cells) and human...
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MULTI PHOTON ABSORPTION INDUCED PHOTOLUMINESCENCE IN DOPED SEMICONDUCTOR QUANTUM DOTS AND HETERO NANOSTRUCTURES
... Research on Quantum Dots, Nanorods and Hetero-junction nanocomposites 1.2.1 Quantum Dots and Nanorods The optical properties of nanocrystals are determined by their electronic structure (Smith and Nie, ... Background…………………………………………………………………… …1 1.2 Previous Research on Quantum Dots, Nanorods and Hetero-junction nanocomposites……………………………………………………………… … 1.2.1 Quantum Dots and Nanorods………………………………………… 1.2.2 Hetero-junction ... four band model of semiconductors (Fedorov et al., 1996) In their model, there are a doubly spin degenerate conduction band, a heavy-hole band, a light-hole band and a spin orbit- split band; and...
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Functionalized quantum dots and its applications
... Introduction 1.1 Quantum Dots and Its Properties 1 1.1.1 Introduction to quantum dots 1.1.2 Quantum dots optical properties 1.2 Quantum Dots in Optical Sensing Applications 1.2.1 Anion and small molecules ... several ligands bounding to the surface of ZnS capped CdSe quantum dots (QDs) was studied Different ligands for quantum dots functionalization was synthesized and characterized by ESI-MS, NMR and FT-IR ... 35 35 3.1.1 Quantum dots and its synthesis 35 3.1.2 Quantum dots ligand exchange strategies 36 3.1.3 Electron transfer based sensor 40 3.2 Experimental Section 41 3.2.1 Materials and instruments...
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Benjamin Franklin and Lightning Rods
... [see Figure 1] big enough to contain a Man and an electrical Stand From the Middle of the Stand let an Iron Rod rise, and pass bending out of the Door, and then upright 20 or 30 feet, pointed very ... with insulated rods and in using protective rods with faulty ground connections Nollet used Richmann's death to heighten the public's fears and to generate opposition to both types of rods. 8 In London, ... should disarm the clouds of heaven, and almost "snatch from his hand the sceptre and the rod!" The ancients would have enrolled him with Bacchus and Ceres, Hercules and Minerva His Paratonnerres erected...
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formation of zno thinfilms consisting of nano-prisms and nano-rods with a high
... (UV, w377 nm) and visible (Vis, w560 nm) regions in all samples The UV emission was attributed to recombination between electrons in the conduction band and holes in the valence band and visible ... solutions A, C and D were approximately 365 nm except for the films grown in solution B (w355 nm) The wider band gap energy of ZnO thin film grown in C and D than those grown in solution A and B were ... 2(a,c)) The surface morphology of ZnO thin films was rough and discontinuous and the lengths of the ZnO nano -rods were w1500 nm (Fig 2(a)) and w500 nm (Fig 2(c)) On the contrary, ZnO thin films consisting...
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Báo cáo y học: "Community-based DOTS and family member DOTS for TB control in Nepal: costs and cost-effectiveness" doc
... – community-based DOTS and family-based DOTS – were developed and assessed in 10 districts using a district-randomised controlled trial (RCT), with each strategy being randomly assigned to districts ... using the community-based DOTS strategy and the family-based DOTS strategy (US$) Districts using the community-based DOTS strategy Districts using the family-based DOTS strategy Palpa Costs per ... success rates and DOTS and Effect of1 community-based DOTS strategies costs per patient registered on the cost-effectiveness of the family-based Effect of changes in treatment success rates and costs...
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Báo cáo " Sol-gel synthesis and particle size characterization of CdSe Quantum dots " ppt
... long time reaction and its distribution in particle size is in the broadening range In this article, we report on the preparation of CdSe quantum dots (QDs) by sol-gel method and investigate their ... Phuong Thanh, Nguyen Van Hung, Pham Thu Nga, Vu Duc Chinh, Vu Thi Hong Hanh, Synthesis CdSe quantumdots and determine its size from optical spectra, Advances in Optics Photonics Spectroscopy & Applications ... spectrophotometer Result and discussion To calculate the particle size of QDs we use some following models: + Using absorption spectra to estimate the mean sizes of QDs: The Effros, Brus and Kayanuma’s...
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Báo cáo toán học: " The structural and optical properties of GaSb/InGaAs type- quantum dots grown on InP (100) substrate" ppt
... structural and optical properties of type-II GaSb/InGaAs quantum dots [QDs] grown on InP (100) substrate by molecular beam epitaxy Rectangular-shaped GaSb QDs were well developed and no nanodash-like ... This material system shows a promising application on quantum- dot infrared detectors and quantum- dot field-effect transistor Introduction Quantum- size nanostructure materials have always been ... comparatively large bandgap energies and provide a possibility of covering the whole middle and far-infared optical range for photoelectric devices Among these material systems, GaSb/GaAs quantum dot...
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Báo cáo hóa học: " Effective harvesting, detection, and conversion of IR radiation due to quantum dots with built-in charge" docx
... and B52) and with inter-dot doping (devices B45 and B53) In devices B44 and B52 (Figure 1a), the dopant sheet concentration was 2.7 × 1011 cm-2 and 5.4 × 1011 cm-2, respectively Devices B45 and ... one, two, and three spatial dimensions [13] This simulation tool self-consistently solves Schrödinger, Poisson, and current equations for electrons and holes The conduction and valence bands of ... made measurements related to quantum- dot infrared photodetectors JL and VM conducted the design and analysis of all experiments and modeling results All authors read and approved the final manuscript...
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Báo cáo hóa học: " Optical properties of as-grown and annealed InAs quantum dots on InGaAs cross-hatch patterns" doc
... in a 1-m monochromator and collected by a cooled InGaAs detector using standard lock-in detection technique Results and discussion The optical properties of the as-grown and annealed QDs on CHP ... photoluminescence; QD: quantum dot; QW: quantum well; TD: threading dislocation; WL: wetting layer Acknowledgements S Thainoi and P Changmoang are acknowledged for maintaining the MBE and PL systems ... contributions CH grew and measured the MBE samples, and interpreted the PL spectra SP provided helps, obtained funding, and supervised the group SK conceived, designed, and supervised the experiments;...
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Báo cáo hóa học: " CdTe quantum dots with daunorubicin induce apoptosis of multidrug-resistant human hepatoma HepG2/ADM cells: in vitro and in vivo evaluation" pptx
... [3] CdTe quantum dots (Cdte QDs) have primarily received attentions in biological and biomedical fields due to their high luminescence efficiency, photostability, and broad absorption and narrow ... Access CdTe quantum dots with daunorubicin induce apoptosis of multidrug-resistant human hepatoma HepG2/ADM cells: in vitro and in vivo evaluation Gen Zhang1, Lixin Shi2, Matthias Selke2 and Xuemei ... nm and emission wavelength at 530 nm The drugs DNR and adriamycin were purchased from Sigma-Aldrich (St Louis, MO, USA) The RPMI 1640 cell culture medium was obtained from Gibco BRL (Grand Island,...
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báo cáo hóa học:" The structural and optical properties of GaSb/InGaAs type-II quantum dots grown on InP (100) substrate" docx
... STEM measurement SZ, TH, and GH conducted the MBE growth JH, WW, and CH coordinated the study WL provided the idea and conceived the study together with ZL All authors read and approved the final ... Strain accumulation in InAs/InxGa1-xAs quantum dots Appl Phys A 2011, 104:257 Wang ZhM, Seydmohamadi Sh, Lee JH, Salamo GJ: Surface ordering of (In, Ga)As quantum dots controlled by GaAs substrate ... type-II GaSb/GaAs quantum dots Appl Phys Lett 1995, 67:656 10 Alonso-Álvarez D, Alén B, García JM, Ripalda JM: Optical investigation of type II GaSb/GaAs self-assembled quantum dots Appl Phys Lett...
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Báo cáo hóa học: " The structural and optical properties of GaSb/InGaAs type-II quantum dots grown on InP (100) substrate" ppt
... STEM measurement SZ, TH, and GH conducted the MBE growth JH, WW, and CH coordinated the study WL provided the idea and conceived the study together with ZL All authors read and approved the final ... Strain accumulation in InAs/InxGa1-xAs quantum dots Appl Phys A 2011, 104:257 Wang ZhM, Seydmohamadi Sh, Lee JH, Salamo GJ: Surface ordering of (In, Ga)As quantum dots controlled by GaAs substrate ... type-II GaSb/GaAs quantum dots Appl Phys Lett 1995, 67:656 10 Alonso-Álvarez D, Alén B, García JM, Ripalda JM: Optical investigation of type II GaSb/GaAs self-assembled quantum dots Appl Phys Lett...
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Báo cáo hóa học: " Effects of Shape and Strain Distribution of Quantum Dots on Optical Transition in the Quantum Dot Infrared " doc
... InAs QD with the height and base ˚ being 80 and 168 A, respectively, and lense-shaped InAs ˚ QD with the height and diameter being 80 and 240 A, respectively The distribution and value of strain ... self-assembled dots: an eight-band study, Phys Rev B 56, 4696 (1997) 16 O Stier, M Grundmann, D Bimberg, Electronic and optical properties of strained quantum dots modeled by 8-band kÁp theory, ... strain eH and the biaxial strain eB are defined as eH ðrÞ ¼ exx ðrÞ þ eyy ðrÞ þ ezz ðrÞ ð3Þ eB ðrÞ ¼ exx ðrÞ þ eyy ðrÞ À 2ezz ðrÞ VHH and VLH are the heavy-hole and light-hole bands, ac, av and b...
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Báo cáo hóa học: " The Role of Intrinsic and Surface States on the Emission Properties of Colloidal CdSe and CdSe/ZnS Quantum Dots Giovanni Morello Æ Marco Anni Æ Pantaleo Davide Cozzoli " potx
... states, E1,2 and E2,3 We found E1,2 = 21 meV and E2,3 = 16 meV for core QDs and E1,2 = 21 meV and E2,3 = 13 meV for core/shell QDs The PL time decay for core and core/shell samples (shown in Fig.1B) ... transitions |1i and |2i to carrier recombination from ± 1U and ± 1L states and the transition |3i to a surface states emission By analysing the temperature dependence of the PL intensities I1, I2 and I3 ... the PL of CdSe core and CdSe/ZnS core/shell QDs in the first ns arises from the intrinsic bright ± 1U and ± 1L states with lifetime of about 60 ps and 450 ps, respectively, and from surface states...
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