Electrical measurements on two-layer phthalocyanine films

Pakhomov, L. G.; Zakamov, V. R.; Pakhomov, Georgy L.

doi:10.1007/s10853-005-2701-5

Cited by 2 publications

(3 citation statements)

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“…Thus, perfluorinated phthalocyanines are n-type materials whereas the non substituted phthalocyanines are p-type, as a result of the stabilization of the occupied and empty energy levels, as determined by photoelectron spectroscopy [8]. As a consequence, perfluorinated phthalocyanines lead to organic field-effect transistors with a n-type channel [9] and were used as n-type materials in heterojunctions [10][11][12][13]. On the contrary, chlorinated phthalocyanines were rarely reported, certainly because of their higher sublimation temperature, in relation with their higher molecular weight and stronger van der Waals interactions compared to fluorinated compounds.…”

Section: Introductionmentioning

confidence: 99%

p-Type and n-type conductometric behaviors of octachloro-metallophthalocyanine-based heterojunctions, the key role of the metal

Ouédraogo

Coulibaly

Meunier‐Prest

et al. 2020

J. Porphyrins Phthalocyanines

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In the present work, we determined the electrical properties of octachlorinated metallophthalocyanines with Co(II) and Cu(II) ions as metal centers. We engaged them in heterojunctions, with lutetium bisphthalocyanine as a partner. Surprisingly, cobalt and copper complexes show opposite behaviors, the first being an [Formula: see text]-type material whereas the latter is a [Formula: see text]-type material, as deduced from the response of the heterojunctions towards ammonia; showing the unusual key role played by the metal center. While the LuPc[Formula: see text]/Cu(Cl[Formula: see text]Pc) complex exhibits a negative response to ammonia, the LuPc[Formula: see text]/Co(Cl[Formula: see text]Pc) complex exhibits a positive response to ammonia, with a sensitivity of 1.47% ppm[Formula: see text] at concentrations lower than 10 ppm and a limit of detection of 250 ppb. All the devices operate at room temperature and in real atmosphere.

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Section: Introductionmentioning

confidence: 99%

p-Type and n-type conductometric behaviors of octachloro-metallophthalocyanine-based heterojunctions, the key role of the metal

Ouédraogo

Coulibaly

Meunier‐Prest

et al. 2020

J. Porphyrins Phthalocyanines

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“…The surface of the lower disk (test) appears to be equally probable for the occurrence and development of pitting [9].…”

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confidence: 99%

“…A heating and cooling device was placed beneath the lower (working) disk, which made it possible to investigate with any direction of heat flow through a specimens. Construction of the device and results of verification of its operating efficiency are presented in [9,13].…”

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confidence: 99%

Pitting corrosion of steel 12Kh18N10T under heat transfer conditions

Pakhomov

Makartsev

2012

Chem Petrol Eng

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The effect of laminar movement and heat transfer on the occurrence and development of stainless steel pitting is studied, using a device based on a system of two disks, one of which (working heat transfer specimen) is stationary, and rotation of a second disk providing solution movement. It is shown that the effect of heat transfer between metal and solution on pitting formation depends on metal temperature and heat flux direction. With a metal temperature of 50°C under heat transfer conditions from metal to solution with an increase in temperature drop pitting corrosion potential increases, and under conditions of heat transfer from solution to metal it decreases. Presence of a heat flux in any direction through a metal-solution phase boundary facilitates the development of pits, but makes their repassivation difficult, and thereby deepens corrosion.Local corrosion is a typical form of heat exchange equipment failure [1], which is connected with structural features of the majority of heat exchangers, and with their operating conditions. Local forms of corrosion of heat-exchange surfaces include pitting, crevice, selective, intercrystalline, and thermogalvanic corrosion, and also corrosion at "hot points" caused by local metal wall heating.Extensive use for cooling of water of different chemical composition (including sea, fresh, and recycled water) facilitates development of pitting corrosion, which is the reason for up to 20% of all cases of breakdown of heat exchangers due to corrosion [2]. However, in spite of the widespread nature of this form of local corrosion, data for the effect of heat transfer conditions on tendency of metals and alloys towards pitting corrosion are limited and often not comparable due to research under insufficiently controlled conditions with respect to hydrodynamics and heat exchange. Nonetheless, from results in [3][4][5][6][7] it is possible to consider it established that heat transfer conditions (metal temperature, temperature drop between metal and solution, magnitude and direction of heat flux) may have a significant effect on the occurrence of pitting corrosion.Pitting corrosion under conditions of movement and heat transfer has been studied using flow-through devices (closed circuits) with vertically arranged heat transfer electrodes in the form of plates [7,8], and also a device with rotating electrodes made in the form of disks [4,6]. Analysis of the structures used has shown [9] that flow-through devices around a test metal surface do not provide controlled conditions with respect to hydrodynamics and heat and mass transfer. Undoubtedly, devices with rotating heat transfer disk electrodes do not have this disadvantage, but within them there is no consideration of one important situation: since the working surface of rotary electrodes faces downwards, the medium within pits having a greater density than the medium with the volume of solution, under the action of gravitational force is displaced from local damage and discarded by centrifugal forces. This changes markedly so...

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Electrical measurements on two-layer phthalocyanine films

Cited by 2 publications

References 4 publications

p-Type and n-type conductometric behaviors of octachloro-metallophthalocyanine-based heterojunctions, the key role of the metal

p-Type and n-type conductometric behaviors of octachloro-metallophthalocyanine-based heterojunctions, the key role of the metal

Pitting corrosion of steel 12Kh18N10T under heat transfer conditions

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