Self‐Assembled Porphyrin Nanostructures and their Potential Applications

Shelnutt, John A.; Medforth, Craig J.

doi:10.1002/9781118354377.ch5

Cited by 4 publications

(3 citation statements)

References 83 publications

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“…Previous studies have developed a working understanding of structure–property relationships of binary porphyrin nanorods with a goal to design and build high performance, stable, and durable molecular devices. − They have also probed the nature and mechanism of nanocrystal formation and allowed the development for a predictive model for size relative to growth conditions . More recent studies focusing on the persistent photoconductivity of TPyP:TSPP nanorods are currently being prepared for publication .…”

Section: Introductionmentioning

confidence: 99%

Persistent Conductivity in TPyP:TSPP Organic Nanorods Induced by Ion Bombardment

et al. 2016

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Persistent conductivity is observed following Ar + bombardment of meso-tetra(4-pyridyl)porphyrin:mesotetra(4-sulfonatophenyl)porphyrin (TPyP:TSPP) nanorods. The lifetime of the persistent conductivity in ultrahigh vacuum (UHV) is exceptionally long at room temperature, between 10 6 and 10 7 s. Ion beam currents can be used to both increase and decrease the level of persistent conductivity in these nanorods. Initial Ar + bombardment of a sample causes an increase in the persistent current. Subsequent bombardment with low-energy Ar + can cause a rapid decrease in the persistent current. A model is presented which presumes that persistent conductivity is carried by metastable defects with rates of excitation and relaxation following the Arrhenius relationship. Energy conservation suggests that ion bombardment introduces a thermal gradient across the nanorod which quickly quenches when ion bombardment ceases. This quick quenching results in a population of metastable defects which decay very slowly at room temperature.

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Section: Introductionmentioning

confidence: 99%

Persistent Conductivity in TPyP:TSPP Organic Nanorods Induced by Ion Bombardment

et al. 2016

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“…Micro- and nanoscale materials that strongly absorb visible and UV light and that can act as catalysts and photocatalysts for conversion of sunlight to fuels are of intense current interest. − Crystalline cooperative binary ionic (CBI) solids, which are self-assembled from anionic and cationic porphyrin molecules, provide a new class of prospective optoelectronic and renewable energy materials. − These porphyrin-based CBI solids admit cooperative interactions between functionally complementary porphyrin subunits leading to interesting emergent collective properties. CBI materials have already been successfully used as light-harvesting photocatalysts for reduction of H 2 O to H 2 , as selective electrocatalysts for reduction O 2 to H 2 O, as adsorbed pigments for functionalizing carbon nanotubes, as H 2 storage materials, and as photoconductors …”

Section: Introductionmentioning

confidence: 99%

“…In contrast, a minor change to the peripheral substituents of only one of the porphyrin ions was recently shown to completely alter the crystal structure and nanoscale morphology of the resulting CBI solids . Other approaches to tailoring the structure and function of porphyrin CBI materials that have been investigated include the construction of hierarchical nanocomposites by the grafting of nanoparticles of one CBI material onto a substructure composed of another CBI solid with complementary functionality and by the exploitation of the photocatalytic activity of a CBI substructure to grow metal nanocatalysts onto its outer surface. − , …”

Section: Introductionmentioning

confidence: 99%

Charge Effects on the Structure and Composition of Porphyrin Binary Ionic Solids: ZnTPPS/SnTMePyP Nanomaterials

et al. 2013

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The pH of the solution from which a cooperative binary ionic material is formed can alter the charges of the organic anions and cations and thus the composition, crystal structure, and properties of the materials obtained by ionic self-assembly. In particular, this pH/charge effect provides a means of synthetic control over the properties and morphologies of ionic solids formed from cationic and anionic porphyrins. In the case of titration of an axial hydroxide ligand of the metal of the porphyrin to water, the charge increases by +1 with little perturbation of the molecular structure of the constituent porphyrin anion or cation. The structure of the material is thus altered without significantly altering the electronic structure of the porphyrin tecton. These novel porphyrin-based ionic materials have potential applications as catalysts, photocatalysts, and optoelectronic and sensing materials.

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Tunable superradiance in porphyrin chains on insulating surfaces

Vlaming¹,

Eisfeld²

2014

J. Phys. D: Appl. Phys.

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Recent experiments have shown that it is possible to synthesize collections of one-dimensional chains of non-covalently bound porphyrins on various surfaces. We provide a study of the optical properties of these systems, and we show that generally one expects the appearance of multiple superradiant transitions, which can be both redshifted or blueshifted with respect to the monomer transitions. Moreover, porphyrin chains can simultaneously support both redshifted and blueshifted features in the absorption spectrum. The energies, absorption strengths and polarizations of the excitonic transitions can be understood in terms of Davydov splitting of chains with one transition per molecule. A distribution over chain lengths and energy relaxation due to coupling to the environment are proposed as mechanisms for the broadening of the superradiant transitions.

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Self‐Assembled Porphyrin Nanostructures and their Potential Applications

Cited by 4 publications

References 83 publications

Persistent Conductivity in TPyP:TSPP Organic Nanorods Induced by Ion Bombardment

Persistent Conductivity in TPyP:TSPP Organic Nanorods Induced by Ion Bombardment

Charge Effects on the Structure and Composition of Porphyrin Binary Ionic Solids: ZnTPPS/SnTMePyP Nanomaterials

Tunable superradiance in porphyrin chains on insulating surfaces

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