Phthalocyanine semiconductor sensors for room-temperature ppb level detection of toxic gases

Temofonte, T. A.; Schoch, K.F.

doi:10.1063/1.343031

Cited by 82 publications

(37 citation statements)

References 18 publications

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“…Phthalocyanines and their derivatives have been widely used as dyestuffs and colours. Nowadays they are also commonly used in high-tech applications, such as photovoltaic, electronic and sensing devices [9][10][11][12]. Porphyrins are widespread compounds in nature.…”

Section: Introductionmentioning

confidence: 99%

Comparison between the electrocatalytic properties of different metal ion phthalocyanines and porphyrins towards the oxidation of hydroxide

Wael

Adriaens

2008

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This work reports on the electrocatalytic oxidation of hydroxide using different central metal ion phthalocyanines and porphyrins immobilized on gold electrodes. The apparent electrocatalytic activity of cobalt phthalocyanine or porphyrin modified electrodes was found to be the greatest among the present series of metal ion macrocycles investigated. Copper and unmetallated phthalocyanine or porphyrin modified electrodes show no electrocatalytic behaviour towards hydroxide, such as bare gold. A possible mechanism for the enhanced reactivity of cobalt ion macrocycles towards the oxygen evolution is given. It is also stated that the electrocatalytic activity towards an adsorbate involves several aspects, such as the coordination state of the central metal ion, the nature of the ligand, the stability of the complexes, the number of d electrons, the energy of orbitals and the strength of the bonding between the central metal ion and the axial ligand.

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Section: Introductionmentioning

confidence: 99%

Comparison between the electrocatalytic properties of different metal ion phthalocyanines and porphyrins towards the oxidation of hydroxide

Wael

Adriaens

2008

Talanta

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“…The former have been widely used as dyestuffs and colours. Nowadays they are also commonly used in high-tech applications, such as photovoltaic, electronic and sensing devices [11][12][13][14]. Porphyrins are widespread compounds in nature.…”

Section: Introductionmentioning

confidence: 99%

Phthalocyanines and porphyrins linked to gold adatoms and their catalytic property towards hydroxide oxidation

Wael¹,

Adriaens²

2008

Electrochimica Acta

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This paper describes the electrochemical formation and detection of gold adatoms, by recording successive cyclic voltammograms of a gold electrode in base, and their ability to function as an anchor for phthalocyanine or porphyrin adsorption. The values of the redox potential of the adatom reactions are linked to the redox potential of the adsorbed central metal ion, cobalt or copper, of the phthalocyanine or porphyrin compound. In addition, when using a phthalocyanine or porphyrin immobilized on a gold electrode, the detection of hydroxide can be improved by electrocatalysis. The catalytic current was found to vary linearly with the hydroxide concentration and a detection limit of 11 × 10 −6 mol L −1 for a 5,10,15,20-tetrakis-(4-carboxyphenyl)-porphyrin-Co(II) modified gold electrode could be calculated.

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“…Pc form complexes with majority of elements in the periodic table [5] and thus they offer great flexibility for tuning their properties via changing the center metal ion and/or inserting different chemical end groups in the molecule. Metal center in MPc introduces various functionalities that make them useful in catalysis [6][7][8], gas sensing [9][10][11] and molecular magnetism applications [12]. Moreover, one of the most important advantages of phthalocyanines over other organic materials is their exceptional thermal and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Interface energetics in zinc phthalocyanine growth on Ag(100)

Abdullah

Sadowski

2016

Phys. Rev. B

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The nucleation and growth of zinc-phthalocyanine (ZnPc) thin films on Ag(100) surface are studied employing in situ, real-time low-energy electron microscopy (LEEM) and complementary DFT calculation to elucidate the role of incorporation kinetics of planar molecules in phase selection during nucleation, and apply this knowledge to fabrication of highly crystalline ZnPc films. We show that the nucleation of crystalline ZnPc islands requires a large concentration of diffusing molecules. The required amount of nominal deposition to initiate growth of ML high 2D crystalline islands is dependent on both, growth temperature and crystalline phase. At room temperature and slightly above (RT to ~430 K), ZnPc crystalline islands have double-domain R33.69 structure, with average domain size in sub-micrometer range. At higher temperatures, a 5x5 commensurate ZnPc structure nucleates. DFT calculations reveal significant differences in interfacial energies of an isolated ZnPc molecule on substrate, depending on an adsorption site and azimuthal orientation of the molecule relative to the substrate atomic lattice. The observed delay in the onset of the nucleation of an island is caused by existence of a large energy barrier for molecule incorporation into an island. At certain growth conditions it is possible to induce a structural transition from 5x5 to R33.69 phase, when the nominal coverage reaches 1ML. The resulting film has excellent crystallinity, with individual domains of hundreds of micrometers in size.

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Phthalocyanine semiconductor sensors for room-temperature ppb level detection of toxic gases

Cited by 82 publications

References 18 publications

Comparison between the electrocatalytic properties of different metal ion phthalocyanines and porphyrins towards the oxidation of hydroxide

Comparison between the electrocatalytic properties of different metal ion phthalocyanines and porphyrins towards the oxidation of hydroxide

Phthalocyanines and porphyrins linked to gold adatoms and their catalytic property towards hydroxide oxidation

Interface energetics in zinc phthalocyanine growth on Ag(100)

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