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Brett MW, Gordon CK, Hardy J, Davis NJLK. The Rise and Future of Discrete Organic-Inorganic Hybrid Nanomaterials. ACS PHYSICAL CHEMISTRY AU 2022; 2:364-387. [PMID: 36855686 PMCID: PMC9955269 DOI: 10.1021/acsphyschemau.2c00018] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Hybrid nanomaterials (HNs), the combination of organic semiconductor ligands attached to nanocrystal semiconductor quantum dots, have applications that span a range of practical fields, including biology, chemistry, medical imaging, and optoelectronics. Specifically, HNs operate as discrete, tunable systems that can perform prompt fluorescence, energy transfer, singlet fission, upconversion, and/or thermally activated delayed fluorescence. Interest in HNs has naturally grown over the years due to their tunability and broad spectrum of applications. This Review presents a brief introduction to the components of HNs, before expanding on the characterization and applications of HNs. Finally, the future of HN applications is discussed.
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Masud AA, Arefin SMN, Fairooz F, Fu X, Moonschi F, Srijanto BR, Neupane KR, Aryal S, Calabro R, Kim DY, Collier CP, Chowdhury MH, Richards CI. Photoluminescence Enhancement, Blinking Suppression, and Improved Biexciton Quantum Yield of Single Quantum Dots in Zero Mode Waveguides. J Phys Chem Lett 2021; 12:3303-3311. [PMID: 33765768 DOI: 10.1021/acs.jpclett.1c00450] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The capability of quantum dots to generate both single and multiexcitons can be harnessed for a wide variety of applications, including those that require high optical gain. Here, we use time-correlated photoluminescence (PL) spectroscopy to demonstrate that the isolation of single CdSeTe/ZnS core-shell, nanocrystal quantum dots (QDs) in Zero Mode Waveguides (ZMWs) leads to a significant modification in PL intensity, blinking dynamics, and biexciton behavior. QDs in aluminum ZMWs (AlZMWs) exhibited a 15-fold increase in biexciton emission, indicating a preferential enhancement of the biexciton radiative decay rate as compared to the single exciton rate. The increase in biexciton behavior was accompanied by a decrease in blinking events due to a shortening in the dark state residence time. These results indicate that plasmon mediated enhanced decay rates of QDs in AlZMWs lead to substantial changes in the photophysical properties of single quantum dots, including an increase in biexciton behavior.
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Affiliation(s)
- Abdullah Al Masud
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - S M Nayeem Arefin
- Department of Electrical and Electronic Engineering, Independent University, Bangladesh (IUB), Dhaka, Bangladesh
| | - Fatema Fairooz
- Department of Electrical and Electronic Engineering, Independent University, Bangladesh (IUB), Dhaka, Bangladesh
| | - Xu Fu
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Faruk Moonschi
- Department of Physiology, University of Kentucky, Lexington, Kentucky 40536, United States
| | - Bernadeta R Srijanto
- Center for Nanophase Materials Sciences, Oakridge National Lab, Oakridge, Tennessee 37831, United States
| | - Khaga Raj Neupane
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Surya Aryal
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Rosemary Calabro
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Doo-Young Kim
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - C Patrick Collier
- Center for Nanophase Materials Sciences, Oakridge National Lab, Oakridge, Tennessee 37831, United States
| | - Mustafa Habib Chowdhury
- Department of Electrical and Electronic Engineering, Independent University, Bangladesh (IUB), Dhaka, Bangladesh
| | - Christopher I Richards
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
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Sherburne MD, Roberts CR, Brewer JS, Weber TE, Laurvick TV, Chandrahalim H. Comprehensive Optical Strain Sensing Through the Use of Colloidal Quantum Dots. ACS APPLIED MATERIALS & INTERFACES 2020; 12:44156-44162. [PMID: 32877159 DOI: 10.1021/acsami.0c12110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The adaptation of colloidal quantum dots loaded within a polymer for use in nondestructive testing can be used as an optical strain gauge due to the nanomaterial's strain sensing properties. In this paper, we utilized InP/ZnS colloidal quantum dots loaded within a polymer matrix applied onto the surface of a dog-bone foil precoated with an epoxy. By employing an empirical formula and a calibration factor, there is a propinquity between both the calculated optical strain and mechanical stress-strain reference data. Fluctuations are observed, which may be due to both additional strain responses not seen by the mechanical data and quantum dot blinking. These results and methods show the applied use of this novel optical nondestructive testing technique for a variety of structures, especially for structures that operate in harsh environments.
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Affiliation(s)
- Michael D Sherburne
- Department of Electrical and Computer Engineering, Air Force Institute of Technology, Dayton, Ohio 45433, United States
| | - Candice R Roberts
- Department of Aeronautics and Astronautics, Air Force Institute of Technology, Dayton, Ohio 45433, United States
| | - John S Brewer
- Department of Aeronautics and Astronautics, Air Force Institute of Technology, Dayton, Ohio 45433, United States
| | - Thomas E Weber
- Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Tod V Laurvick
- Department of Electrical and Computer Engineering, Air Force Institute of Technology, Dayton, Ohio 45433, United States
| | - Hengky Chandrahalim
- Department of Electrical and Computer Engineering, Air Force Institute of Technology, Dayton, Ohio 45433, United States
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Mazzio KA, Prasad SKK, Okamoto K, Hodgkiss JM, Luscombe CK. End-Functionalized Semiconducting Polymers as Reagents in the Synthesis of Hybrid II-VI Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9692-9700. [PMID: 30056697 DOI: 10.1021/acs.langmuir.8b01307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The functionalization of II-VI nanocrystals with semiconducting polymers is of fundamental interest for lightweight, solution-processed optoelectronics. The direct surface functionalization of nanocrystals is useful for facilitating charge transfer across the donor/acceptor interface, in addition to promoting good mixing properties and thereby helping prevent nanoparticle aggregation. In this work, we develop a new method for the direct attachment of semiconducting polymers to II-VI inorganic nanocrystals, where the polymer plays a dual role, acting as both the desired capping agent and a chalcogenide monomer during synthesis. The success of this hybridization procedure relies on the establishment of a new polymer end-functionalization scheme, where a route toward a thio-phosphonate polymer end-group is developed; this end-group resembles many chalcogenide precursor materials used in the synthesis of II-VI nanomaterials. We show the applicability of this hybrid functionalization procedure by attaching poly(3-hexylthiophene-2,5-diyl) to CdSe and CdS. We followed the progress of the reaction by NMR and used transmission electron microscopy to determine the morphology of the resulting materials, which we found to have narrow size distributions after hybridization. Polymer attachment to the nanocrystals was confirmed by examining the steady-state and time-resolved optical properties of the hybrid materials, which also provided an insight into excited-state processes occurring across the hybrid interface.
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Affiliation(s)
| | - Shyamal K K Prasad
- School of Chemical and Physical Sciences , Victoria University of Wellington , Wellington 6040 , New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology , Wellington 6140 , New Zealand
| | - Ken Okamoto
- Department of Engineering for Future Innovation, Division of Chemical Engineering and Biotechnology , National Institute of Technology, Ichinoseki College , Takanashi, Hagisho, Ichinoseki , Iwate 021-8511 , Japan
| | - Justin M Hodgkiss
- School of Chemical and Physical Sciences , Victoria University of Wellington , Wellington 6040 , New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology , Wellington 6140 , New Zealand
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Hu L, Zhang C, Zeng G, Chen G, Wan J, Guo Z, Wu H, Yu Z, Zhou Y, Liu J. Metal-based quantum dots: synthesis, surface modification, transport and fate in aquatic environments and toxicity to microorganisms. RSC Adv 2016. [DOI: 10.1039/c6ra13016j] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The intense interest in metal-based QDs is diluted by the fact that they cause risks to aquatic environments.
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Aguilera-Sigalat J, Bradshaw D. Synthesis and applications of metal-organic framework–quantum dot (QD@MOF) composites. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.08.004] [Citation(s) in RCA: 194] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Abstract
Photoactive nanoparticles are smart systems that exhibit unique optical properties. In general, their intrinsic properties are size dependent. The degree and type of response to size are both related to their composition. Nanoparticles usually require to be capped with organic ligands in order to be dispersible in an aqueous or organic media, thus leading to nanoparticle colloidal dispersions and enhancing the processability of the material. The organic ligand also plays a key role in their preparation. In addition, the high surface-to-volume ratio of the nanoparticles combined with the affinity of the ligands for the nanoparticle surface can be used to place a large number of functional molecules at their periphery. The purpose of this chapter is to understand the synergism between nanoparticles and organic ligands with regard to their preparation, performance, and applicability.
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Jeon H, Lee ASS, Kim HJ, Cho SH, Baek KY, Hwang SS. Preparation of highly emissive, thermally stable, UV-cured polysilsesquioxane/ZnO nanoparticle composites. J Appl Polym Sci 2015. [DOI: 10.1002/app.42333] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hyeonyeol Jeon
- Materials Architecturing Research Center; Korea Institute of Science and Technology; Hwarangno 14-gil 5 Seong-Buk Gu Seoul 136-791 Republic of Korea
- Nanomaterials Science and Engineering; University of Science and Technology; 217 Gajungro, 176 Gajung-dong Yuseong-Gu Daejeon Korea 305-333
| | - Albert Sung Soo Lee
- Materials Architecturing Research Center; Korea Institute of Science and Technology; Hwarangno 14-gil 5 Seong-Buk Gu Seoul 136-791 Republic of Korea
| | - Hyun-Ji Kim
- Materials Architecturing Research Center; Korea Institute of Science and Technology; Hwarangno 14-gil 5 Seong-Buk Gu Seoul 136-791 Republic of Korea
| | - So-Hye Cho
- Materials Architecturing Research Center; Korea Institute of Science and Technology; Hwarangno 14-gil 5 Seong-Buk Gu Seoul 136-791 Republic of Korea
- Nanomaterials Science and Engineering; University of Science and Technology; 217 Gajungro, 176 Gajung-dong Yuseong-Gu Daejeon Korea 305-333
| | - Kyung-Youl Baek
- Materials Architecturing Research Center; Korea Institute of Science and Technology; Hwarangno 14-gil 5 Seong-Buk Gu Seoul 136-791 Republic of Korea
- Nanomaterials Science and Engineering; University of Science and Technology; 217 Gajungro, 176 Gajung-dong Yuseong-Gu Daejeon Korea 305-333
| | - Seung Sang Hwang
- Materials Architecturing Research Center; Korea Institute of Science and Technology; Hwarangno 14-gil 5 Seong-Buk Gu Seoul 136-791 Republic of Korea
- Nanomaterials Science and Engineering; University of Science and Technology; 217 Gajungro, 176 Gajung-dong Yuseong-Gu Daejeon Korea 305-333
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Kaur G, Tripathi SK. Investigation of trypsin-CdSe quantum dot interactions via spectroscopic methods and effects on enzymatic activity. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 134:173-183. [PMID: 25011044 DOI: 10.1016/j.saa.2014.05.064] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/21/2014] [Accepted: 05/16/2014] [Indexed: 06/03/2023]
Abstract
The paper presents the interactions between trypsin and water soluble cadmium selenide (CdSe) quantum dots investigated by spectrophotometric methods. CdSe quantum dots have strong ability to quench the intrinsic fluorescence of trypsin by a static quenching mechanism. The quenching has been studied at three different temperatures where the results revealed that electrostatic interactions exist between CdSe quantum dots and trypsin and are responsible to stabilize the complex. The Scatchard plot from quenching revealed 1 binding site for quantum dots by trypsin, the same has been confirmed by making isothermal titrations of quantum dots against trypsin. The distance between donor and acceptor for trypsin-CdSe quantum dot complexes is calculated to be 2.8 nm by energy transfer mechanisms. The intrinsic fluorescence of CdSe quantum dots has also been enhanced by the trypsin, and is linear for concentration of trypsin ranging 1-80 μl. All the observations evidence the formation of trypsin-CdSe quantum dot conjugates, where trypsin retains the enzymatic activity which in turn is temperature and pH dependent.
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Affiliation(s)
- Gurvir Kaur
- Centre of Advanced Study in Physics, Department of Physics, Panjab University, Chandigarh 160014, India
| | - S K Tripathi
- Centre of Advanced Study in Physics, Department of Physics, Panjab University, Chandigarh 160014, India.
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10
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Surface functionalization of quantum dots for biological applications. Adv Colloid Interface Sci 2015; 215:28-45. [PMID: 25467038 DOI: 10.1016/j.cis.2014.11.004] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 10/25/2014] [Accepted: 11/10/2014] [Indexed: 01/17/2023]
Abstract
Quantum dots are a group of inorganic nanomaterials exhibiting exceptional optical and electronic properties which impart distinct advantages over traditional fluorescent organic dyes in terms of tunable broad excitation and narrow emission spectra, signal brightness, high quantum yield and photo-stability. Aqueous solubility and surface functionalization are the most common problems for QDs employed in biological research. This review addresses the recent research progress made to improve aqueous solubility, functionalization of biomolecules to QD surface and the poorly understood chemistry involved in the steps of bio-functionalization of such nanoparticles.
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Abstract
Recently, organic-inorganic hybrid nanocomposite materials have been of great interest for their extraordinary performances due to the combination of the advantageous properties of polymers and the size dependent properties of nanocrystals (NCs). Interaction between the polymer matrix and nanocrystalline fillers produces wonderful features, viz. thermal, magnetic, mechanical, electrical and optical properties to these materials. Modern applications require a new design of responsive functional coatings which is capable of changing their properties in a controlled way. However, the synthesis of II-VI nanoparticles into the polymer matrix of its nanocomposites with adjustable sizes and protected from photo-oxidation is a big challenge to the scientific community. It is difficult to synthesize the highly enhanced luminescence in polymers and its semiconductor nanocomposite systems. Luminescence from the polymer embedded II-VI nanoparticles is greatly enhanced and better stability can be achieved from the composite compared to bulk materials. The formation of nanocomposites can be confirmed by photoluminescence (PL) spectroscopy. It is an important technique for determining the optical gap, purity, crystalline quality defects and analysis of the quantum confinement in these nanocomposite materials. In this paper, we have reviewed the present status of II-VI polymer nanocomposites from the photoluminescence studies point of view. We have also shown the results of the PL of these nanocomposite materials and the results will be compared with the reported literature by other groups.Contents of Paper
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12
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Hybrid Organic/Inorganic Nanocomposites for Photovoltaic Cells. MATERIALS 2014; 7:2747-2771. [PMID: 28788591 PMCID: PMC5453346 DOI: 10.3390/ma7042747] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 03/11/2014] [Accepted: 03/19/2014] [Indexed: 01/15/2023]
Abstract
Inorganic/organic hybrid solar cells have attracted a lot of interest due to their potential in combining the advantages of both components. To understand the key issues in association with photoinduced charge separation/transportation processes and to improve overall power conversion efficiency, various combinations with nanostructures of hybrid systems have been investigated. Here, we briefly review the structures of hybrid nanocomposites studied so far, and attempt to associate the power conversion efficiency with these nanostructures. Subsequently, we are then able to summarize the factors for optimizing the performance of inorganic/organic hybrid solar cells.
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Lemon CM, Curtin PN, Somers RC, Greytak AB, Lanning RM, Jain RK, Bawendi MG, Nocera DG. Metabolic tumor profiling with pH, oxygen, and glucose chemosensors on a quantum dot scaffold. Inorg Chem 2014; 53:1900-15. [PMID: 24143874 PMCID: PMC3944830 DOI: 10.1021/ic401587r] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Acidity, hypoxia, and glucose levels characterize the tumor microenvironment rendering pH, pO2, and pGlucose, respectively, important indicators of tumor health. To this end, understanding how these parameters change can be a powerful tool for the development of novel and effective therapeutics. We have designed optical chemosensors that feature a quantum dot and an analyte-responsive dye. These noninvasive chemosensors permit pH, oxygen, and glucose to be monitored dynamically within the tumor microenvironment by using multiphoton imaging.
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Affiliation(s)
- Christopher M. Lemon
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138
| | - Peter N. Curtin
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
| | - Rebecca C. Somers
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
| | - Andrew B. Greytak
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208
| | - Ryan M. Lanning
- Edwin L. Steele Laboratory for Tumor Biology, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, 100 Blossom Street, Cox-7, Boston, MA 02114
| | - Rakesh K. Jain
- Edwin L. Steele Laboratory for Tumor Biology, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, 100 Blossom Street, Cox-7, Boston, MA 02114
| | - Moungi G. Bawendi
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138
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Praveen VK, Ranjith C, Bandini E, Ajayaghosh A, Armaroli N. Oligo(phenylenevinylene) hybrids and self-assemblies: versatile materials for excitation energy transfer. Chem Soc Rev 2014; 43:4222-42. [DOI: 10.1039/c3cs60406c] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The engineering of the nanostructure of OPV based self-assemblies allows control of photoinduced energy transfer processes, leading to materials exhibiting tunable luminescence colours, including white.
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Affiliation(s)
- Vakayil K. Praveen
- Istituto per la Sintesi Organica e la Fotoreattività
- Consiglio Nazionale delle Ricerche (ISOF-CNR)
- 40129 Bologna, Italy
| | - Choorikkat Ranjith
- Dipartimento di Chimica Organica
- Università degli Studi di Milano
- 20133 Milano, Italy
| | - Elisa Bandini
- Istituto per la Sintesi Organica e la Fotoreattività
- Consiglio Nazionale delle Ricerche (ISOF-CNR)
- 40129 Bologna, Italy
| | - Ayyappanpillai Ajayaghosh
- Photosciences and Photonics Group
- Chemical Sciences and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST)
- Trivandrum 695019, India
| | - Nicola Armaroli
- Istituto per la Sintesi Organica e la Fotoreattività
- Consiglio Nazionale delle Ricerche (ISOF-CNR)
- 40129 Bologna, Italy
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Lee CS, Kim B, Jeon S, Han CJ, Hong SK. Thermal Curing Property of Silicone Encapsulant Containing Quantum Dot Surrounded by Various Types of Ligands. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.12.3787] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Matvienko OO, Prodanov MF, Gorobets NY, Vashchenko VV, Vovk OM, Babayevskaya NV, Savin YN. Impact of dendritic interface modifiers on phase behavior of polyvinylcarbazol-CdSe/ZnS nanocomposite films. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3114-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Strong V, Uribe-Romo FJ, Battson M, Kaner R. Oriented polythiophene nanofibers grown from CdTe quantum dot surfaces. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:1191-6, 1125. [PMID: 22351435 DOI: 10.1002/smll.201101983] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 11/10/2011] [Indexed: 05/12/2023]
Abstract
Highly crystalline, doped polythiophene is grown from the surfaces of CdTe quantum dots by ligand exchange of 3-thenoic acid followed by an oxidant-initiated polymerization. The facile synthesis generates a composite of highly ordered fibers, which exhibit efficient charge transfer between the polythiophene and the inorganic CdTe quantum dots.
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Affiliation(s)
- Veronica Strong
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Box 951569, Los Angeles, California 90095, USA
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Bixby TJ, Cordones AA, Leone SR. CdSe/ZnS quantum dot intermittency in N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine (TPD). Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.11.051] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Moulé AJ, Chang L, Thambidurai C, Vidu R, Stroeve P. Hybrid solar cells: basic principles and the role of ligands. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c1jm14829j] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yalcin SE, Labastide JA, Sowle DL, Barnes MD. Spectral properties of multiply charged semiconductor quantum dots. NANO LETTERS 2011; 11:4425-30. [PMID: 21905683 DOI: 10.1021/nl2026103] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Spectrally resolved fluorescence imaging of single CdSe/ZnS quantum dots (QDs), charged by electrospray deposition under negative bias has revealed a surprising net blue shift (∼60 meV peak-to-peak) in the distribution of center frequencies in QD band-edge luminescence. Electrostatic force microscopy (EFM) on the electrospray QD samples showed a subpopulation of charged QDs with 4.7 ± 0.7 excess electrons, as well as a significant fraction of uncharged QDs as evidenced by the distinct cantilever response under bias. We show that the blue-shifted peak recombination energy can be understood as a first-order electronic perturbation that affects the band-edge electron- and hole-states differently. These studies provide new insight into the role of electronic perturbations of QD luminescence by excess charges.
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Affiliation(s)
- Sibel Ebru Yalcin
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States
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Maitra U, Jain A, George SJ, Rao CNR. Tunable fluorescence in chromophore-functionalized nanodiamond induced by energy transfer. NANOSCALE 2011; 3:3192-7. [PMID: 21660351 DOI: 10.1039/c1nr10295h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Hybrid materials comprising diamond nanoparticles (ND) and oligo(phenylenevinylenes) (OPVs) have been synthesized by the covalent linking of acid-functionalized ND and OPV-amine. Chromophore-functionalized ND particles with long alkyl and π-conjugated groups are readily dispersed in various organic solvents without any precipitation after several hours. A careful study of the properties of the hybrid materials revealed an aggregation-induced energy transfer from the blue fluorescent nanodiamonds to green emitting OPVs. At very low concentrations the hybrid emits in the blue region, but as the concentration is increased a gradual transition from blue to green emission occurs. Competitive processes such as aggregation-induced enhanced emission and self-absorption have been ruled out and a molecular picture of the phenomenon is proposed. This strategy can open a plethora of new avenues for fluorescent nanodiamonds in optoelectronics and light harvesting apart from bio-imaging.
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Affiliation(s)
- Urmimala Maitra
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur P.O., Bangalore, 560064, India
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Wang Q, Chen G, Shi X, Jin R, Wang L, Chen D. Controllable synthesis of Cu7Te4 nanoparticles and sheet-like particles through the delayed reaction and their thermal stability. POWDER TECHNOL 2011. [DOI: 10.1016/j.powtec.2010.10.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Kanelidis I, Vaneski A, Lenkeit D, Pelz S, Elsner V, Stewart RM, Rodríguez-Fernández J, Lutich AA, Susha AS, Theissmann R, Adamczyk S, Rogach AL, Holder E. Inorganic–organic nanocomposites of CdSe nanocrystals surface-modified with oligo- and poly(fluorene) moieties. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03546g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Yu Z, Wang CF, Chen S. Fabrication of quantum dot-based photonic materials from small to large via interfacial self-assembly. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10281h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ding L, Li X, Liu P, Li S, Lv J. Study of the action of Se and Cu on the growth metabolism of Escherichia coli by microcalorimetry. Biol Trace Elem Res 2010; 137:364-72. [PMID: 20058194 DOI: 10.1007/s12011-009-8583-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Accepted: 12/01/2009] [Indexed: 11/28/2022]
Abstract
The biological effect of Se and Cu²(+) on Escherichia coli (E. coli) growth was studied by using a 3114/3236 TAM Air Isothermal Calorimeter, ampoule method, at 37°C. From the thermogenesis curves, the thermokinetic equations were established under different conditions. The kinetics showed that a low concentration of Se (1-10 μg/mL) promoted the growth of E. coli, and a high concentration of Se (>10 μg/mL) inhibited the growth, but the Cu²(+) was always inhibiting the growth of E. coli. Moreover, there was an antagonistic or positive synergistic effect of Se and Cu²(+) on E. coli in the different culture medium when Se was 1-10 μg/ml and Cu²(+) was 1-20 μg/ml. There was a negative synergistic effect of Se and Cu²(+) on E. coli when Se was higher than 10 μg/ml and Cu²(+) was higher than 20 μg/ml. The antagonistic or synergistic effect between Se and Cu²(+) on E. coli was related to the formation of Cu-Se complexes under the different experimental conditions chosen.
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Affiliation(s)
- Ling Ding
- Wuhan University of Science and Technology, Hubei, People's Republic of China.
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Kharisov BI, Kharissova OV, Valdés JJR, Pérez VMJ. Coordination and Organometallic Nanomaterials: A Microreview. ACTA ACUST UNITED AC 2010. [DOI: 10.1080/15533174.2010.509303] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Boris I. Kharisov
- a Universidad Autónoma de Nuevo León, Ciudad Universitaria UANL , San Nicolás de los Garza, Mexico
| | - Oxana V. Kharissova
- a Universidad Autónoma de Nuevo León, Ciudad Universitaria UANL , San Nicolás de los Garza, Mexico
| | - Juan Jacobo Ruíz Valdés
- a Universidad Autónoma de Nuevo León, Ciudad Universitaria UANL , San Nicolás de los Garza, Mexico
| | - Victor M. Jiménez Pérez
- a Universidad Autónoma de Nuevo León, Ciudad Universitaria UANL , San Nicolás de los Garza, Mexico
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Semiconductor Nanocrystals Hybridized with Functional Ligands: New Composite Materials with Tunable Properties. MATERIALS 2010. [PMCID: PMC5525183 DOI: 10.3390/ma3010614] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Semiconductor nanocrystals hybridized with functional ligands represent an important new class of composite nanomaterials. The development of these new nanoscale building blocks has intensified over the past few years and offer significant advantages in a wide array of applications. Functional ligands allow for incorporation of nanocrystals into areas where their unique photophysics can be exploited. Energy and charge transfer between the ligands and the nanocrystal also result in enhanced physical properties that can be tuned by the choice of ligand architecture. Here, progress in the development and applications involving this new class of composite materials will be discussed.
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Tal’roze RV, Shandryuk GA, Merekalov AS, Shatalova AM, Otmakhova OA. Alignment of nanoparticles in polymer matrices. POLYMER SCIENCE SERIES A 2009. [DOI: 10.1134/s0965545x09110030] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Hellriegel C, Gratton E. Real-time multi-parameter spectroscopy and localization in three-dimensional single-particle tracking. J R Soc Interface 2009; 6 Suppl 1:S3-14. [PMID: 18753123 PMCID: PMC2706464 DOI: 10.1098/rsif.2008.0313.focus] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Accepted: 07/30/2008] [Indexed: 11/12/2022] Open
Abstract
Tracking of single particles in optical microscopy has been employed in studies ranging from material sciences to biophysics down to the level of single molecules. The technique intrinsically circumvents ensemble averaging and may therefore reveal directly mechanistic details of the involved dynamic processes. Such processes range from translational and rotational motion to spectral dynamics. We distinguish between conventional a posteriori tracking of objects (e.g. from the sequences of images) and the experimentally more refined 'on-the-fly' tracking technique. In this technique, the observation volume of the microscope is kept centred with respect to the moving object via a feedback algorithm. This approach brings a series of advantages in comparison with the tracking from images, ranging from a superior spatio-temporal resolution (2-50nm and 1-32ms) to the capability of inferring additional data (e.g. fluorescence lifetime, emission spectrum, polarization, intensity dynamics) from an object as it moves over several microns in three dimensions. In this contribution, we describe the principle of the tracking technique as implemented on a two-photon laser scanning microscope and illustrate its capabilities with experimental data, from particles labelled with different dyes moving in a liquid to the characterization of small fluorescently labelled protein assemblies in living cells.
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Affiliation(s)
- Christian Hellriegel
- />Laboratory for Fluorescence Dynamics and Department of Biomedical Engineering, University of California Irvine3120 Natural Sciences II, Irvine, CA 92697, USA
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Odoi MY, Hammer NI, Early KT, McCarthy KD, Tangirala R, Emrick T, Barnes MD. Fluorescence lifetimes and correlated photon statistics from single CdSe/oligo(phenylene vinylene) composite nanostructures. NANO LETTERS 2007; 7:2769-73. [PMID: 17655370 DOI: 10.1021/nl0713068] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We present measurements of fluorescence intensity trajectories and associated excited-state decay times from individual CdSe/oligo(phenylene vinylene) (CdSe-OPV) quantum dot nanostructures using time-tagged, time-resolved (TTTR) photon counting techniques. We find that fluorescence decay times for the quantum dot emitter in these composite systems are at least an order of magnitude shorter than ZnS-capped CdSe quantum dot systems. We show that both the blinking suppression and associated lifetime/count rate behavior can be described by a modified version of the diffusive reaction coordinate model which couples slow fluctuations in quantum dot electron (1Se, 1Pe) energies to Auger-assisted hole trapping processes, hence modifying both blinking statistics and excited-state decay rates.
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Affiliation(s)
- M Y Odoi
- George R. Richason, Jr. Chemistry Research Laboratory, Department of Chemistry , University of Massachusetts, Amherst, Massachusetts 01003, USA
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