Comparative study of optical, structural and electrical properties of zinc phthalocyanine Langmuir–Blodgett thin film on annealing

Roy, Dhrubojyoti; Das, Nayan Mani; Shakti, Nanda; Gupta, Partha Sarathi

doi:10.1039/c4ra05417b

Cited by 73 publications

(72 citation statements)

References 41 publications

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“…The UV-VIS spectrum (250-800 nm, equivalent to ~1 to 5 eV) observed for CuPc originates from molecular orbitals within the aromatic 18-π-electron system and from overlapping orbitals on the central metal [33][34][35]. In the near-UV region, the B (or Soret) band, with a peak ranging from 335 to 350 nm for CuPc crystals in this work, is assigned to the electronic transition between π-π* (b2u to eg) orbitals [36]. In the visible region, the Q band representing the π-π* transition (b1u to eg) is usually split, probably by the Davydov splitting [35].…”

Section: Vibrational and Optical Properties Of Cupc Crystalsmentioning

confidence: 99%

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

Zou

Wang

et al. 2018

Crystals

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Abstract:The optical properties of organic materials are very sensitive to subtle structural modification, and a proper understanding of the structure-property relationship is essential to improve the performance of organic electronic devices. The phase transitions of the η-CuPc to the α-CuPc, then to the β-CuPc were investigated using In situ X-ray diffraction and the differential scanning calorimetry (DSC). The five stages in the phase-transition process from low to high-temperature were observed, which consisted of (1) the η-CuPc; (2) a mixture of the η-and α-CuPc; (3) a mixture of the η-, α-and β-CuPc; (4) a mixture of the α-and β-CuPc; and (5) the β-CuPc. The vibrational and optical properties at different phase-transition stages were correlated to molecular packing motif and molecule overlap type through systematic analyses of the Fourier-transform infrared, Raman and UV-VIS spectra. Moreover, the mechanism for the morphology evolution was also discussed in detail.

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Section: Vibrational and Optical Properties Of Cupc Crystalsmentioning

confidence: 99%

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

Zou

Wang

et al. 2018

Crystals

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“…These aggregations impart high stability to MPc, and hence, these are insoluble in most of the organic solvents. Surface active forces at the air–water (a–w) interface and π − π stacking forces are believed to be the main driving forces responsible for these aggregates . The UV–Vis absorption of MPcs is strongly dependent upon concentration.…”

Section: Resultsmentioning

confidence: 96%

Metallophthalocyanine‐enriched Langmuir‐Schaefer multilayers of poly(vinylidene fluoride)‐based nanocomposites

Kumar

Viswanath

2019

J of Applied Polymer Sci

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Engineering the surface morphology with optimized crystallinity is very crucial for practical applications such as energy storage, electromechanical devices, and self‐cleaning. Organic nanocomposites permit one to tune the dielectric properties by controlling the crystallinity and surface morphology. Here, we report our investigation on metallophthalocyanines of nickel and copper as an organic additive to poly(vinylidene fluoride) (PVDF) to modify the structural, optical, wetting, and electrical properties of the nanocomposite multilayers deposited using Langmuir‐Schaefer method. The incorporation of the metallophthalocyanines in the nanocomposite multilayers was confirmed from the signature Bragg peaks, and the fingerprint absorbance using grazing incidence X‐ray diffraction and Fourier transform infrared spectroscopy, respectively. Aggregation behavior of the metallophthalocyanines in the polar matrix of PVDF was studied using ultraviolet–visible spectroscopy. Surface morphological studies using field emission scanning electron microscopy on the nanocomposite multilayers show the presence of both spherical crystallites and rod‐like structures which depends upon the composition and nature of metal in metallophthalocyanine. The surface wettability of these multilayers was investigated using static and dynamic contact angle studies. A significant enhancement in the dielectric constant has been observed for both nanocomposites relative to the pristine multilayer of PVDF. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47818.

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“…The main difference between the a-and the b-ZnPc modification is the distance between the central Zn atom and N atoms of two adjacent molecules, which is minimal in b-phase ZnPc [25]. The structural transition from a-to b-ZnPc leads to different optical [21], electrical [26], and microstructural [27] properties.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, consistently with the bulk TEM measurements, we attribute the nanorod shaped structures to b-ZnPc domains. Moreover, the observed bZnPc nanorods in ZnPc:C 60 blends appear at significantly lower temperatures compared to the structural transition in pristine ZnPc layers [26,21,45].…”

Section: (Photo-)conductive Atomic Force Microscopymentioning

confidence: 90%

Experimental and theoretical study of phase separation in ZnPc:C60 blends

Mönch

Sherkar

Koster

et al. 2015

Organic Electronics

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Comparative study of optical, structural and electrical properties of zinc phthalocyanine Langmuir–Blodgett thin film on annealing

Abstract: Model representing growth mechanism in the LB thin film during phase transformation from α- to β-phase on annealing.

Cited by 73 publications

References 41 publications

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

Metallophthalocyanine‐enriched Langmuir‐Schaefer multilayers of poly(vinylidene fluoride)‐based nanocomposites

Experimental and theoretical study of phase separation in ZnPc:C60 blends

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