Thermal Analysis, Dielectric Response and Electrical Conductivity of Silicon Phthalocyanine Dichloride (SiPcCl2) Thin Films

Salam, Mohamed Abdel; El-Mallah, H. M.; El-Damhogi, D.G.; Elesh, E.

doi:10.1007/s11664-020-08604-x

Cited by 4 publications

(2 citation statements)

References 66 publications

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“…An attractive group of Pcs are Si(IV) incorporated MPcs, due to the low toxicity and elemental abundance of silicon, in addition to their low energy gap (∼1.7 eV) [ 10 ]. Silicon phthalocyanine compounds (SiPcs) have been extensively studied for their intense absorption levels in the visible portion of the spectrum [ 11 , 12 ]. Unlike most MPcs and other core-substituted Pcs, silicon phthalocyanines (SiPcs) bring additional possibilities, as their hexacoordinated core-substituent Si(IV) ion allows the two additional axial substitution positions beyond only the peripheral ring α and β Pc positions, in addition to the great Si–N bond stability [ 9 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Structural determination, characterization and computational studies of doped semiconductors base silicon phthalocyanine dihydroxide and dienynoic acids

Sánchez Vergara,

Sandoval Plata,

Ballinas Indili

et al. 2024

Heliyon

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Section: Introductionmentioning

confidence: 99%

Structural determination, characterization and computational studies of doped semiconductors base silicon phthalocyanine dihydroxide and dienynoic acids

Sánchez Vergara,

Sandoval Plata,

Ballinas Indili

et al. 2024

Heliyon

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“…Phthalocyanines (Pcs) area large family of hetero-cyclic conjugated compounds with strong chemical stability. These characteristics make phthalocyanines a significant structural material that can be utilized in many applications such as systems of optical data storage, gas sensors, switching devices and photosensitisers in medical applications [1][2][3][4][5]. One limitation of Pcs applications in solutions is that phthalocyanines are characterized by a very high tendency to aggregate, which reduces their photosensitizing ability through self-quenching.…”

Section: Introductionmentioning

confidence: 99%

The effect of silicon phthalocyanine on cell death and mitochondrial membrane potential in pancreatic cancer cells

KAYA

BOGUSLU

KABAK

et al. 2022

Turkish Journal of Analytical Chemistry

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Silicon (SiPcs) phthalocyanines are advantageous because they do not aggregate due to their special structural features. Therefore, they have been widely used in a range of areas in chemical and biological technology. One of the common applications is the use of phthalocyanines on cancer therapies. Pancreas cancer is one of the most common cancers with a high rate of mortality around the world. In this study we therefore aimed to investigate the potential of SiPcs molecules which we previously synthesized for the first time, on increased cell death and the effect on mitochondrial activity in pancreatic cancer cells. The results showed the significantly selective cytotoxic effect of SiPc on cancer cells compared to normal cells. Mitochondrial membrane potential was not different in cancer cells but in normal cells after SiPcs treatment. Pre-incubation time (24h) of SiPcs before light irradiation induced more significant cytotoxicity in pancreatic cancer cells but not in normal cells compared to prolonged pre-incubation (48). This study revisited the biological function of previously synthesized SiPcs, and the results conclude the cytotoxic activity of SiPcs on pancreas cancer. These preliminary findings can be extended for other cancer types and detailed with in vivo models in the future.

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Microstructure evolution, dielectric response, and conduction mechanism of La1–xYxFeO3, (0 < x < 0.3) annealed perovskites synthesized via a sol–gel combustion technique

Ibrahim,

Mosaad,

Elesh

2024

J Mater Sci: Mater Electron

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The structural and dielectric characteristics of nano-crystalline La1−xYxFeO3, (0 < x < 0.3) perovskite samples synthesized through the citrate auto-combustion route were investigated. The findings of X-ray diffraction (XRD) analysis revealed that the synthesized perovskites exhibited a polycrystalline orthorhombic structure with a space group Pnma. Furthermore, the tolerance factor was indicative of the phase stability of the orthoferrite series. Based on the refined XRD data, the size of the crystallites was estimated to be between 11.9 and 18.5 nm using size-strain plots (SSP). To gain more insight into the crystal structure, high-resolution transmission electron microscopy (HRTEM) was employed. The estimated size based on HRTEM calculations agreed with the XRD findings. The influence of annealing temperature on the frequency dependence of the dielectric response was thoroughly investigated for nano-crystalline La1−xYxFeO3 perovskites. The investigation took place at room temperature as well as different annealing temperatures, with a comprehensive frequency range of 50 Hz to ~ 2 MHz. The incorporation of Y3+ ions into LaFeO3 (LFO) has resulted in a significant enhancement of the dielectric constant values. This improvement is attributed to the successful integration of Y3+ ions, which have effectively modified the electrical properties of LFO. Furthermore, the annealing has been shown to enhance both the values of the dielectric constant, ε1(ω) and ε2(ω), which are critical parameters for electronic devices. Based on a power law response, the AC conductivity displays an increase with dopant concentration and frequency. Additionally, it has been noted that the activation energy value for LFOY30 is slightly reduced by 0.01 eV in comparison to pure LFO. The AC conductivity of LFOY30 was observed to increase with thermal annealing over the temperature range of 333 K to 463 K. This result confirms the occurrence of thermally activated conduction in the material. Based on this finding, LFOY30 is deemed appropriate for use in applications that require effective heat dissipation. The frequency exponent, s, decreases with increasing temperature from 0.87 to 0.56 for LFO and from 0.488 to 0.42 for LFOY30, respectively, which is associated with the correlated barrier hopping (CBH) model. The maximum barrier height (WM) was around 0.26 eV. The loss tangent (tanδ) variation was estimated as a function of frequency at different dopant concentrations and temperatures. Doping and annealing have been identified as appropriate measures for enhancing the electrical properties of the La1−xYxFeO3 system, thereby making it a useful material for electronic devices.

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Thermal Analysis, Dielectric Response and Electrical Conductivity of Silicon Phthalocyanine Dichloride (SiPcCl2) Thin Films

Cited by 4 publications

References 66 publications

Structural determination, characterization and computational studies of doped semiconductors base silicon phthalocyanine dihydroxide and dienynoic acids

Structural determination, characterization and computational studies of doped semiconductors base silicon phthalocyanine dihydroxide and dienynoic acids

The effect of silicon phthalocyanine on cell death and mitochondrial membrane potential in pancreatic cancer cells

Microstructure evolution, dielectric response, and conduction mechanism of La1–xYxFeO3, (0 < x < 0.3) annealed perovskites synthesized via a sol–gel combustion technique

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