Photophysical studies of CdTe quantum dots in the presence of a zinc cationic porphyrin.

The photophysical properties of 2.3 nm thioglycolic acid (TGA) coated CdTe quantum dots (QDs) prepared by a reflux method have been studied in the presence of cationic meso-tetrakis(4-N-methylpyridyl) zinc porphyrin (ZnTMPyP4). Addition of the CdTe QDs to the porphyrin in H(2)O results in a marked red-shift and hypochromism in the porphyrin absorption spectrum, indicative of a non-covalent binding interaction with the QD surface. Only low equivalents of the quantum dot were required for complete quenching of the porphyrin fluorescence revealing that one quantum dot may quench more than one porphyrin. Similarly addition of porphyrin to the quantum dot provided evidence for very efficient quenching of the CdTe photoluminescence, suggesting the formation of CdTe-porphyrin aggregates. Definitive evidence for such aggregates was gathered using small angle X-ray spectroscopy (SAXS). Ultrafast transient absorption data are consistent with very rapid photoinduced electron transfer (1.3 ps) and the resultant formation of a long-lived porphyrin species.

[1]  Dongyuan Zhao,et al.  Journal of Colloid and Interface Science. Editorial. , 2014, Journal of colloid and interface science.

[2]  Stephan Irle,et al.  High-rate charge-carrier transport in porphyrin covalent organic frameworks: switching from hole to electron to ambipolar conduction. , 2012, Angewandte Chemie.

[3]  M. Amelia,et al.  Photosensitization of the luminescence of CdTe nanocrystals by noncovalently bound Zn tetraphenylporphyrin , 2012 .

[4]  Gang Chen,et al.  Ultrafast Exciton Dynamics in CdTe Nanocrystals and Core/Shell CdTe/CdS Nanocrystals , 2011 .

[5]  S. Sarkar,et al.  Self-Assembly of Magnesium and Zinc Trimethoxyphenylporphyrin Polymer as Nanospheres and Nanorods , 2011 .

[6]  Edward H Sargent,et al.  Colloidal quantum dot photovoltaics: a path forward. , 2011, ACS nano.

[7]  J. M. Nicoludis,et al.  Induction of G-quadruplex DNA structure by Zn(II) 5,10,15,20-tetrakis(N-methyl-4-pyridyl)porphyrin. , 2011, Biochimie.

[8]  A. Rogach.  Fluorescence energy transfer in hybrid structures of semiconductor nanocrystals , 2011 .

[9]  A. Rogach,et al.  Semiconductor Nanocrystal Quantum Dots as Solar Cell Components and Photosensitizers: Material, Charge Transfer, and Separation Aspects of Some Device Topologies , 2011 .

[10]  F. D’Souza,et al.  Near unity photon-to-electron conversion efficiency of photoelectrochemical cells built on cationic water-soluble porphyrins electrostatically decorated onto thin-film nanocrystalline SnO₂ surface. , 2011, ACS applied materials & interfaces.

[11]  M. Malfois,et al.  Vernier templating and synthesis of a 12-porphyrin nano-ring , 2011, Nature.

[12]  M. W. George,et al.  Ultra: A Unique Instrument for Time-Resolved Spectroscopy , 2010, Applied spectroscopy.

[13]  Prashant V Kamat,et al.  Beyond photovoltaics: semiconductor nanoarchitectures for liquid-junction solar cells. , 2010, Chemical reviews.

[14]  M. Martínez‐Díaz,et al.  Lighting porphyrins and phthalocyanines for molecular photovoltaics. , 2010, Chemical communications.

[15]  Susan J. Quinn,et al.  Synthesis and spectroscopic studies of chiral CdSe quantum dots , 2010 .

[16]  Nicholas A Kotov,et al.  Chiral luminescent CdS nano-tetrapods. , 2010, Chemical communications.

[17]  Carl C. Wamser,et al.  Porphyrins and phthalocyanines in solar photovoltaic cells , 2010 .

[18]  A. Rogach,et al.  Progress in the light emission of colloidal semiconductor nanocrystals. , 2010, Small.

[19]  A. Nozik.  Nanoscience and nanostructures for photovoltaics and solar fuels. , 2010, Nano letters.

[20]  Juanjuan Peng,et al.  Studying the interaction between CdTe quantum dots and Nile blue by absorption, fluorescence and resonance Rayleigh scattering spectra. , 2010, Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy.

[21]  R. Renganathan,et al.  Investigations on the photoinduced interaction of water soluble thioglycolic acid (TGA) capped CdTe quantum dots with certain porphyrins. , 2010, Journal of colloid and interface science.

[22]  H. Ghosh,et al.  Ultrafast Charge Carrier Relaxation and Charge Transfer Dynamics of CdTe/CdS Core−Shell Quantum Dots as Studied by Femtosecond Transient Absorption Spectroscopy , 2010 .

[23]  S. Kuwabata,et al.  Systematic Studies on Emission Quenching of Cadmium Telluride Nanoparticles , 2009 .

[24]  Dmitri V Talapin,et al.  Increased Color‐Conversion Efficiency in Hybrid Light‐Emitting Diodes utilizing Non‐Radiative Energy Transfer , 2009, Advanced materials.

[25]  Pavlos G. Lagoudakis,et al.  Efficient light harvesting in hybrid CdTe nanocrystal/bulk GaAs p-i-n photovoltaic devices , 2009 .

[26]  A Paul Alivisatos,et al.  Materials availability expands the opportunity for large-scale photovoltaics deployment. , 2009, Environmental science & technology.

[27]  H. Demir,et al.  Structural tuning of color chromaticity through nonradiative energy transfer by interspacing CdTe nanocrystal monolayers , 2009 .

[28]  R. Schaller,et al.  New aspects of carrier multiplication in semiconductor nanocrystals. , 2008, Accounts of chemical research.

[29]  R. Nitschke,et al.  Quantum dots versus organic dyes as fluorescent labels , 2008, Nature Methods.

[30]  C. S. Sotomayor Torres,et al.  Light-emitting diodes with semiconductor nanocrystals. , 2008, Angewandte Chemie.

[31]  T. Nyokong,et al.  Spontaneous charge transfer between zinc tetramethyl-tetra-2,3-pyridinoporphyrazine and CdTe and ZnS quantum dots , 2008 .

[32]  T. Nyokong,et al.  The photophysical studies of a mixture of CdTe quantum dots and negatively charged zinc phthalocyanines , 2008 .

[33]  A. Susha,et al.  Quantum dot microdrop laser , 2008, 2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science.

[34]  S. Maenosono,et al.  Solution-processed polymer-free photovoltaic devices consisting of PbSe colloidal quantum dots and tetrabenzoporphyrins , 2008 .

[35]  L. Liz‐Marzán,et al.  Femtosecond dynamics of CdTe quantum dots in water , 2008 .

[36]  Andrey L. Rogach,et al.  Hybrid nanocomposite materials with organic and inorganic components for opto-electronic devices , 2008 .

[37]  T. Nyokong,et al.  Photoinduced energy transfer between water-soluble CdTe quantum dots and aluminium tetrasulfonated phthalocyanine , 2008 .

[38]  Yongfang Li,et al.  Bright, multicoloured light-emitting diodes based on quantum dots , 2007 .

[39]  Igor Nabiev,et al.  Nonfunctionalized nanocrystals can exploit a cell's active transport machinery delivering them to specific nuclear and cytoplasmic compartments. , 2007, Nano letters.

[40]  John M Kelly,et al.  Chiral highly luminescent CdS quantum dots. , 2007, Chemical communications.

[41]  Thomas A. Klar,et al.  Aqueous synthesis of thiol-capped CdTe nanocrystals : State-of-the-art , 2007 .

[42]  John A. Tainer,et al.  X-ray solution scattering (SAXS) combined with crystallography and computation: defining accurate macromolecular structures, conformations and assemblies in solution , 2007, Quarterly Reviews of Biophysics.

[43]  T. Sasaki,et al.  Photoelectrochemical properties of alternating multilayer films composed of titania nanosheets and Zn porphyrin. , 2007, Langmuir : the ACS journal of surfaces and colloids.

[44]  J. Donegan,et al.  Synthesis, Characterisation, and Biological Studies of CdTe Quantum Dot–Naproxen Conjugates , 2007, ChemMedChem.

[45]  J. Donegan,et al.  Optimisation of the synthesis and modification of CdTe quantum dots for enhanced live cell imaging , 2006 .

[46]  M. Crawford,et al.  Nanocrystal-based light-emitting diodes utilizing high-efficiency nonradiative energy transfer for color conversion. , 2006, Nano letters.

[47]  M. Kenney,et al.  Femtosecond time-resolved energy transfer from CdSe nanoparticles to phthalocyanines , 2006 .

[48]  A. Orden,et al.  Directing energy flow through quantum dots: towards nanoscale sensing , 2006, Analytical and bioanalytical chemistry.

[49]  Igor L. Medintz,et al.  Quantum dot-based multiplexed fluorescence resonance energy transfer. , 2005 .

[50]  Giorgio Parisi,et al.  Physica A: Statistical Mechanics and its Applications: Editorial note , 2005 .

[51]  Qing Wang,et al.  Efficient light harvesting by using green Zn-porphyrin-sensitized nanocrystalline TiO2 films. , 2005, The journal of physical chemistry. B.

[52]  T. Balaban.  Tailoring porphyrins and chlorins for self-assembly in biomimetic artificial antenna systems. , 2005, Accounts of chemical research.

[53]  Leif O. Brown,et al.  Thiol-functionalized, 1.5-nm gold nanoparticles through ligand exchange reactions: scope and mechanism of ligand exchange. , 2005, Journal of the American Chemical Society.

[54]  A. Eychmüller,et al.  Size-dependent electrochemical behavior of thiol-capped CdTe nanocrystals in aqueous solution. , 2005, The journal of physical chemistry. B.

[55]  U. Jeng,et al.  Effect of Arm Length on the Aggregation Structure of Fullerene-Based Star Ionomers , 2004 .

[56]  Darryl L. Smith,et al.  Energy-transfer pumping of semiconductor nanocrystals using an epitaxial quantum well , 2004, Nature.

[57]  A Paul Alivisatos,et al.  Employing end-functional polythiophene to control the morphology of nanocrystal-polymer composites in hybrid solar cells. , 2004, Journal of the American Chemical Society.

[58]  Igor L. Medintz,et al.  Self-assembled nanoscale biosensors based on quantum dot FRET donors , 2003, Nature materials.

[59]  Xiaogang Peng,et al.  Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystals , 2003 .

[60]  M. Fontaine‐Aupart,et al.  Femtosecond relaxation processes from upper excited states of tetrakis(N-methyl-4-pyridyl)porphyrins studied by transient absorption spectroscopy , 2002 .

[61]  Nikolai Gaponik,et al.  THIOL-CAPPING OF CDTE NANOCRYSTALS: AN ALTERNATIVE TO ORGANOMETALLIC SYNTHETIC ROUTES , 2002 .

[62]  K. Rajeshwar,et al.  Semiconductor-Based Composite Materials: Preparation, Properties, and Performance , 2001 .

[63]  A. Bergmann,et al.  Evaluation of small-angle scattering data of charged particles using the generalized indirect Fourier transformation technique , 2000 .

[64]  M. El-Sayed,et al.  New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses , 1999 .

[65]  Donald Fitzmaurice,et al.  Programmed Assembly of Gold Nanocrystals in Aqueous Solution , 1999 .

[66]  A. Rogach,et al.  Synthesis and Characterization of a Size Series of Extremely Small Thiol-Stabilized CdSe Nanocrystals , 1999 .

[67]  R. Tsien,et al.  Fluorescent indicators for Ca2+based on green fluorescent proteins and calmodulin , 1997, Nature.

[68]  O. Glatter,et al.  Small-Angle Scattering of Interacting Particles. I. Basic Principles of a Global Evaluation Technique , 1997 .

[69]  W. Brown,et al.  Light Scattering: Principles and development , 1996 .

[70]  E. Gibbs,et al.  Interactions of porphyrins and metalloporphyrins with single-stranded poly(dA) , 1990 .

[71]  M. J. Murphy,et al.  A comparative study of the interaction of 5, 10, 15, 20-tetrakis (N- methylpyridinium-4-yl)porphyrin and its zinc complex with DNA using fluorescence spectroscopy and topoisomerisation , 1985, Nucleic Acids Res..

[72]  M. Neumann-Spallart,et al.  Photophysical and redox properties of water-soluble porphyrins in aqueous media , 1982 .

[73]  John B. Hayter,et al.  A rescaled MSA structure factor for dilute charged colloidal dispersions , 1982 .

[74]  P. Neta.  One-electron transfer reactions involving zinc and cobalt porphyrins in aqueous solutions , 1981 .

[75]  O. Glatter,et al.  A new method for the evaluation of small‐angle scattering data , 1977 .

[76]  W. Ehrenberg,et al.  Small-Angle X-Ray Scattering , 1952, Nature.

[77]  P. Alivisatos.  The use of nanocrystals in biological detection , 2004, Nature Biotechnology.

[78]  Thomas M. Jovin,et al.  Quantum dots finally come of age , 2003, Nature Biotechnology.

[79]  Tim Lincoln,et al.  Chemical communications , 1992, Nature.

[80]  E. Hall,et al.  The nature of biotechnology. , 1988, Journal of biomedical engineering.

[81]  J. Nyerere.  Principles and development , 1966 .