Modulation of optical absorption in poly(diphenylenephthalide) films near the switching threshold

Лачинов, А. Н.; Zhdanov, E. R.; Rakhmeev, R. G.; Салихов, Р. Б.; Antipin, V. A.

doi:10.1134/s1063783410010336

Cited by 18 publications

(8 citation statements)

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“…Thus, we obtained the result that is consistent with the results of photoelectron spectroscopy [14] and suggests the presence of deep electron states in bandgap.…”

Section: Quantum-chemical Calculationssupporting

confidence: 93%

“…In this respect, it was proposed to use electroabsorption modulation spectroscopy in order to reveal and study the structure of optical absorption in the visible range of the spectrum of a thin polymer film that undergoes a transition from the dielectric state to the high-conductivity state [14]. This method is based on measuring the changing components of the optical signal under the influence of external alternating field.…”

Section: Modulation Spectroscopymentioning

confidence: 99%

“…In order to analyze the possibility of transforming the electronic spectrum of polymer molecules we performed quantum-chemical calculations [14]. Thus, numerical investigations have shown that individual molecules of polydiphenylenephthalide have two energetically stable geometric configurations.…”

Section: Quantum-chemical Calculationsmentioning

confidence: 99%

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Smart Polymers as Basic for Bio-, Chemical and Physical Sensors

Лачинов

Gadiev

Салихов

et al. 2014

Nanotechnology in the Security Systems

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Dielectric materials found more application in electronics during the last decade's. Among wide range of nonconjugated polymers should be noted. This paper gives the basic results of nonconjugated polymers research made by Ufa group. The peculiarities of electron transport in polymers are shown. The possibilities of application of such materials in basic for bio-, chemical and physical sensors are considered.

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“…Thus, we obtained the result that is consistent with the results of photoelectron spectroscopy [14] and suggests the presence of deep electron states in bandgap.…”

Section: Quantum-chemical Calculationssupporting

confidence: 93%

Section: Modulation Spectroscopymentioning

confidence: 99%

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Smart Polymers as Basic for Bio-, Chemical and Physical Sensors

Лачинов

Gadiev

Салихов

et al. 2014

Nanotechnology in the Security Systems

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“…In thin films of wide band gap polymers such as PDP, an intermediate narrow band of allowed states can arise in the middle of the band gap. It is the coherent charge transport band [7] formed under exposure to a weak external pressure on polymer or a rather strong applied electric voltage. When the Fermi level of the electrode coincides with the level of the coherent charge transport band of polymer, a conduc tivity jump (electronic switching) occurs.…”

Section: Polymersmentioning

confidence: 99%

The role of the wide-band-gap polymer layer for the existence of conductivity switching in the valve structure

Лачинов

Воробьева

2012

Phys. Solid State

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428Previously, the possibility of switching the conduc tivity in the metal/polymer/metal asymmetric struc ture containing only one ferromagnetic electrode and a layer of a wide band gap polymer material (poly(diphenylenephthalide), PDP) was detected [1]. It was also shown that the conductivity switching by the magnetic field is associated with partial polariza tion over the spin of charges injected from the ferro magnet [2]. However, the results of [1, 2] do not allow a conclusion on spin transport within the polymer layer. Experiments on the structure such as a spin valve could answer the question on the possibility of spin transport through a rather thick polymer film. In such a structure, the injecting electrode plays the role of a polarizer; the second ferromagnetic electrode serves as an analyzer of spin polarized current carriers. In this case, a change in the magnetization direction in the electrode analyzer should result in modulation of the current flowing in the structure under study.In this context, the objective of this research is to study the possibility of spin transport occurring through a layer of a wide band gap polymer material in an experimental configuration such as the spin valve.The main difference between the samples studied in this work and those used previously [1] is the replacement of the nonmagnetic copper electrode by the ferromagnetic metal Ni electrode. Thus, in this work, we study the "symmetric" ferromagnet/poly mer/ferromagnet structure unlike the "asymmetric" ferromagnet/polymer/non ferromagnetic metal structure previously considered in [1,2]. The elec trode with a large coercivity in the symmetric structure under consideration was fabricated by depositing a nickel layer on an antiferromagnetic Cr layer [3]. The lower two layer chromium/nickel film grown by sequential deposition of these metals on glass in vac uum was characterized in the initial state by a prefer ential direction and increased magnetic rigidity (Fig. 1a). The upper nickel film was a soft magnetic elec trode and had not a preferential direction in the initial state (Fig. 1b). Polymer was deposited in one layer or in two layers to increase the distance for possible spin transfer. The thickness of these structures was no less than 500 nm and to 1.2 μm, respectively. Measure ments were performed at room temperature, magnetic fields were less than 500 mT.Since abrupt changes in the working cell resistance (six-eight orders of magnitude) in the experimental circuit were possible, a circuit with a current generator was used.The external magnetic field could be oriented par allel or perpendicular to the structure plane. Observa Abstract-The effect of electronic switching of the conductivity by a magnetic field lower than 500 mT has been implemented in the spin valve structure in the "current perpendicular to plane" geometry with a trans port layer of a wide band gap polymer to 1200 nm thick. The problem of spin transfer through the polymer layer has been discussed in the model of ballistic charge transport over nanos...

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“…Optical properties of poly(diphenylenephthalide) films near the electronic switching threshold have been studied by modulation spectroscopy (Lachinov et al, 2010). The results obtained have been interpreted using quantum chemical calculations of the electron energy characteristics of the polymer molecule.…”

Section: Polyarylenephthalides (Diphenylphthalide-based Polymers)mentioning

confidence: 99%

Advances in Chemical Sensors

Wang¹

2012

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Academy of Sciences (IOA-CAS), who received his MS degree from the Central South University of China in 2002, and his PhD degree from IOA-CAS in 2005. From 2005 to 2009, he worked as a postdoctoral researcher and research professor at the microsystem laboratory of the Ajou University in Korea. Prof. Wang worked at the Freiburg University supported by the Humboldt Foundation as a guest professor in 2010, and received the "Experienced researcher" award from Humboldt Foundation of Germany for his outstanding research work in SAW technology. He joined the IOA-CAS as an associate professor of acoustical microsystems Lab. and as a professor in 2007 and 2011 respectively.His current research involves acoustic wave devices for sensing applications and wireless sensor, etc. Prof. Wang is the author or co-author of more than 50 papers in a refereed international journal, more than 40 communications in international conferences and over 10 patents.

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Modulation of optical absorption in poly(diphenylenephthalide) films near the switching threshold

Cited by 18 publications

References 10 publications

Smart Polymers as Basic for Bio-, Chemical and Physical Sensors

Smart Polymers as Basic for Bio-, Chemical and Physical Sensors

The role of the wide-band-gap polymer layer for the existence of conductivity switching in the valve structure

Advances in Chemical Sensors

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