Nonlinear optical properties of thermally stable silicon-containing poly(o-hydroxyamide) with a covalently bound chromophore in a side chain

Bursian, A. E.; Климова, Н. В.; Rudaya, L. I.; Sokolova, Inna M.; Lukoshkin, V. A.; Lebedeva, G. K.

doi:10.1134/s106378340803027x

Cited by 2 publications

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“…Finally, the samples were annealed in a tube furnace for 8 -12 hours at 1050 -1200 ºC in air. Similar conditions are used to prepare samples with surface reconstruction on other oxides, particularly SrTiO3 [1][2][3][4][5][6][7][8][9].…”

Section: Materials and Methods: Tem Sample Preparationmentioning

confidence: 99%

“…First observed in solids by Bursian et al [1], the term flexoelectricity was coined in the field of liquid crystals [2] and subsequently adopted for solids [3] and also biological membranes [4]. The flexoelectric effect (the presence of a polarization due to a strain gradient) occurs in many materials [4][5][6][7][8][9]; these effects are more pronounced as the thickness of a material decreases.…”

mentioning

confidence: 92%

“…In their pioneering work, Bursian et al [1] observed curvature in a BaTiO3 film due to the application of an electric field. A 2.5 µm thick film of BaTiO3 was measured to have a curvature of 150 m -1 ; it was predicted that in films of nanometer thickness, the curvature would be of the order of 10 6 -10 10 m -1 [1]. While none of the existing literature includes direct experimental evidence demonstrating such high curvature values, there is one indirect measurement of comparable curvatures [19].…”

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confidence: 99%

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Direct Observation of Large Flexoelectric Bending at the Nanoscale in Lanthanide Scandates

2018

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There is a growing interest in the flexoelectric effect, since at the nanoscale it is predicted to be very large. However, there have been no direct observations of flexoelectric bending consistent with current theoretical work that implies strains comparable to or exceeding the yield strains of typical materials. Here we show a direct observation of extraordinarily large, two-dimensional reversible bending at the nanoscale in dysprosium scandate due to the converse flexoelectric effect, with similar results for terbium and gadolinium scandate. Within a transmission electron microscope, thin features bend up to 90° with radii of curvature of about 1 μm, corresponding to very large nominal strains. Analysis including independent experimental determination of the flexoelectric coefficient is semiquantitatively consistent with interpreting the results as due to flexoelectricity. These results experimentally demonstrate large flexoelectric bending at the nanoscale.

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Section: Materials and Methods: Tem Sample Preparationmentioning

confidence: 99%

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confidence: 92%

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confidence: 99%

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Direct Observation of Large Flexoelectric Bending at the Nanoscale in Lanthanide Scandates

2018

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“…It can be seen from Figure 2 that sensibilization with phthalocyanine dye leads to the appearance of two additional absorption bands in the spectra at the wavelengths 620-640 nm and 680-700 nm in comparison with non-sensitized material(dye-free PHA polymer matrix). Absorption of the polymer matrix monotonously increases to the shorter wavelengths starting from 700 nm; presumably, PHA has a strong absorption band in the UV region [7]. In the longer wavelengths part of the spectra starting from 800 nm both PHA matrix and phthalocyanine are virtually transparent.…”

Section: Investigation Of the Optical Properties Of Pha/phthalocyaninementioning

confidence: 99%

Investigation of optical and photoelectric properties of poly (ohydroxyamide) sensitized by phthalocyanine as a perspective material for solar cells

et al. 2020

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Optical and photoelectric properties of poly (ohydroxyamide) (PHA) sensitized with zinc phthalocyanines were investigated in the visible and near infrared spectral regions. The structures were deposited on glass substrates by centrifugation and subsequent drying of a PHA film without thermal annealing. Optical spectra revealed characteristic absorption peaks of phthalocyanine in the longer wavelength region at 620-640 nm and 680-700 nm; absorption of the PHA matrix monotonously increases to the shorter wavelengths starting from 700 nm. Measurements of the photocurrent under irradiation with a high-power LED at a wavelength 630 nm showed photoconductivity related to the organic dye; photoconductivity also was observed while irradiated at 540 nm, presumably due to the absorption of PHA matrix. For non-sensitized (dye-free) PHA films no detectable photocurrents were produced by 630 nm irradiation. It was shown that introducing of phthalocyanines significantly improves optical absorption and photoconductivity of PHA thin films at the wavelengths, where the maximum in the spectral distribution of solar radiation lies. It was concluded that phthalocyanine-sensitized PHA has the potential use as a photosensitive organic material for solar applications, for example in developing composite organicinorganic structures with ferroelectrics.

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Nonlinear optical properties of thermally stable silicon-containing poly(o-hydroxyamide) with a covalently bound chromophore in a side chain

Cited by 2 publications

References 2 publications

Direct Observation of Large Flexoelectric Bending at the Nanoscale in Lanthanide Scandates

Direct Observation of Large Flexoelectric Bending at the Nanoscale in Lanthanide Scandates

Investigation of optical and photoelectric properties of poly (ohydroxyamide) sensitized by phthalocyanine as a perspective material for solar cells

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