Conjugates of thermally stable phthalocyanine J-type dimers with single-walled carbon nanotubes for enhanced optical limiting applications

Savelyev, Mikhail S.; Gerasimenko, Alexander Yu.; Podgaetskii, Vitaly M.; Tereshchenko, S. A.; Селищев, С. В.; Tolbin, Alexander Yu.

doi:10.1016/j.optlastec.2019.04.036

Cited by 47 publications

(21 citation statements)

References 34 publications

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“…This electronic structure adds interesting properties to the compound by providing delocalization [2]. In this context, solar cells [3,4], non-linear optics [5], chemical sensors [6], liquid crystals [7], laser dyes [8], photocatalytic [9], catalytic [10], photovoltaic [11], photochromic [12] and photodynamic therapy(PDT) [13,14] are being investigated extensively for obtaining photosensitive agents. Despite these wide uses, there are problems with phthalocyanines that need to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Design of novel substituted phthalocyanines; synthesis and fluorescence, DFT, photovoltaic properties

Ağırtaş¹,

Solğun²,

Yıldıko³

et al. 2020

Turk J Chem

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The 4-(2-(3,4-dimethoxyphenoxy) phenoxy) phthalonitrile was synthesized as the starting material of new syntheses. Zinc, copper, and cobalt phthalocyanines were achieved by reaction of starting compound with Zn(CH3COO)2, CuCl2 and CoCl2 metal salts. Basic spectroscopic methods such as nuclear magnetic resonance electronic 2 absorption, mass and infrared were used in the structure characterization of the compounds. Absorption, excitation and emission measurements of fluorescence zinc phthalocyanine compound were also investigated in THF. Then, structural, energy and electronic properties for synthesized metallophthalocyanines were determined by quantum chemical calculations including DFT method. The band gap of HOMO and LUMO was determined to be chemically active. Global reactivity (I, A, η, s, μ, χ, ω) and non-linear properties were studied. In addition, molecular electrostatic potential (MEP) maps were drawn to identify potential reactive regions of metallo phthalocyanine (M-Pc) compounds. Photovoltaic performances of phthalocyanine compounds for dye sensitive solar cells were investigated. Solar conversion efficiency of DSSC based on copper, zinc and cobalt phthalocyanine compounds was 1.69%, 1.35% and 1.54%, respectively. Compounds have good solubility and show nonlinear optical properties. Zinc phthalocyanine gave fluorescence emission.

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Section: Introductionmentioning

confidence: 99%

Design of novel substituted phthalocyanines; synthesis and fluorescence, DFT, photovoltaic properties

Ağırtaş¹,

Solğun²,

Yıldıko³

et al. 2020

Turk J Chem

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“…The laser operated in pulsed mode with pulse duration 100 ns and frequency 30 kHz. It is known that pulsed radiation of short duration generates nonlinear optical effects in carbon nanotubes and graphene [ 75 , 94 ]. The laser setup had a galvanometric scanning system.…”

Section: Methodsmentioning

confidence: 99%

Electrically Conductive Networks from Hybrids of Carbon Nanotubes and Graphene Created by Laser Radiation

et al. 2021

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A technology for the formation of electrically conductive nanostructures from single-walled carbon nanotubes (SWCNT), multi-walled carbon nanotubes (MWCNT), and their hybrids with reduced graphene oxide (rGO) on Si substrate has been developed. Under the action of single pulses of laser irradiation, nanowelding of SWCNT and MWCNT nanotubes with graphene sheets was obtained. Dependences of electromagnetic wave absorption by films of short and long nanotubes with subnanometer and nanometer diameters on wavelength are calculated. It was determined from dependences that absorption maxima of various types of nanotubes are in the wavelength region of about 266 nm. It was found that contact between nanotube and graphene was formed in time up to 400 fs. Formation of networks of SWCNT/MWCNT and their hybrids with rGO at threshold energy densities of 0.3/0.5 J/cm2 is shown. With an increase in energy density above the threshold value, formation of amorphous carbon nanoinclusions on the surface of nanotubes was demonstrated. For all films, except the MWCNT film, an increase in defectiveness after laser irradiation was obtained, which is associated with appearance of C–C bonds with neighboring nanotubes or graphene sheets. CNTs played the role of bridges connecting graphene sheets. Laser-synthesized hybrid nanostructures demonstrated the highest hardness compared to pure nanotubes. Maximum hardness (52.7 GPa) was obtained for MWCNT/rGO topology. Regularity of an increase in electrical conductivity of nanostructures after laser irradiation has been established for films made of all nanomaterials. Hybrid structures of nanotubes and graphene sheets have the highest electrical conductivity compared to networks of pure nanotubes. Maximum electrical conductivity was obtained for MWCNT/rGO hybrid structure (~22.6 kS/m). Networks of nanotubes and CNT/rGO hybrids can be used to form strong electrically conductive interconnections in nanoelectronics, as well as to create components for flexible electronics and bioelectronics, including intelligent wearable devices (IWDs).

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“…This fragment was characterized by Raman spectrum (Fig. 1c) with the G band intensity that was much higher than the D and Dʹ bands intensities [6]. Hexagon and rhombus shapes are shown in Fig.…”

Section: Modeling Of a Graphene Sheet Fragment With An Edge Vacancy Dmentioning

confidence: 96%

“…Usually the ratio of the intensities of G and D bands is determined for quality control [2]. The D band intensity is several orders of magnitude lower than the G band intensity for samples with a low number of defects [6]. If the intensities of these bands are proportional, the samples have a rather large number of defects.…”

Section: Introductionmentioning

confidence: 99%

Influence of edge defects on Raman spectra of graphene

et al. 2020

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The effect of the vacancy edge defect (bonds breaking between carbon atoms) of a graphene sheet on the Raman spectrum was studied. The spectra were calculated using the density functional theory (DFT) using the Gaussian-09 program. Modeling of a graphene sheet fragment with a break of one bond between carbon atoms at the edge showed that changes in the Raman spectrum were common for the presence of nitrogen and oxygen atoms. In this case, the strongest D lines appear in functionalized graphene with oxygen atoms, and the Dʹ lines-in nitrogen-doped graphene. This is confirmed by the experimental Raman spectra as well as calculated ones. The strongest 2D line is characteristic of the graphene model without impurities; the presence of other oxygen or nitrogen atoms leads to a decrease in its intensity. Modeling of a graphene sheet fragment with a break of one bond between carbon atoms at the edge showed that changes in the spectrum are common for both cases of graphene nitrogen-doping and functionalization with oxygen atoms. A comparison of the experimental data with the simulation results showed good agreement between the data. Moreover, the vibrations of hydrogen atoms linked by covalent bonds with neighboring carbon atoms moved towards each other in disturbed hexagonal structures located on the edge of the graphene sheet. Such a steric effect led to a decrease in the frequency of the stretching vibration q(CH), which appeared in the region of ~2700 cm −1 and corresponded to the 2D vibration. The results of the vacancy edge defect modeling for the graphene sheet fragment being nitrogen-doped and functionalized by oxygen atoms were compared with experimental data.

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Conjugates of thermally stable phthalocyanine J-type dimers with single-walled carbon nanotubes for enhanced optical limiting applications

Cited by 47 publications

References 34 publications

Design of novel substituted phthalocyanines; synthesis and fluorescence, DFT, photovoltaic properties

Design of novel substituted phthalocyanines; synthesis and fluorescence, DFT, photovoltaic properties

Electrically Conductive Networks from Hybrids of Carbon Nanotubes and Graphene Created by Laser Radiation

Influence of edge defects on Raman spectra of graphene

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