Optical and theoretical studies on Fe<sub>3</sub>O<sub>4</sub>–imidazole nanocomposite and clusters

Jayabharathi, Jayaraman; Ramanathan, P.; Thanikachalam, Venugopal; Karunakaran, C.

doi:10.1039/c4nj02068e

Cited by 16 publications

(12 citation statements)

References 72 publications

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“…The bi‐exponential decay fit indicates that NSPI is in two excited states – in excited state I, the styryl ring is perpendicular with the NSPI ring, and in excited state II, the styryl ring is coplanar with the NSPI ring. The X‐ray crystal structure and theoretical calculation show the perpendicular configuration as most stable, and hence, the observed longer lifetime is attributed to the same. The observed bi‐exponential decay indicates that the NSPI–CSZO composite formation is possible with both conformation of NSPI.…”

Section: Resultsmentioning

confidence: 82%

Study of interfacial charge transfer in nanosemiconductor–molecule composites

Jayabharathi

Prabhakaran

Karunakaran

et al. 2016

J of Physical Organic Chem

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Interaction of sol-gel synthesized Ce-Ag-codoped ZnO (CSZO) nanocrystals with (E)-1-(naphthalen-1-yl)-2-styryl-1Hphenanthro [9,10-d]imidazole has been analysed. The synthesized nanocrystals and their composites with naphthyl styryl phenanthrimidazole have been characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy, X-ray diffractometry, X-ray photoelectron spectroscopy (XPS) lifetime and Fourier transform infrared spectroscopy and cyclic voltammetry. XPS shows doped silver and cerium in Ag 0 and Ce 4+ states, respectively . SEM and TEM images of CSZO nanoparticles show that they appear to be 3D trapezoid and cocoon-like shape. The selected area electron diffraction pattern supports the nanocrystalline character of the synthesized material. The percentages of doping of cerium and silver in CSZO are 0.54 (at.) and 0.34 (at.), respectively. From the energy levels of the materials used in the imidazole-CSZO composite, the dominant CT direction has been analysed. Theoretical investigation shows that the binding energy and energy gap of the imidazole composites are highly dependent on the nature of the silver oxide cluster and that charge transfer in the imidazole-Ag 4 O 4 composite is faster than the same in other composites. Molecular docking technique has also been carried out to understand the imidazole-DNA interactions. Figure 7. (a) Lifetime spectra of NSPI and NSPI-Ce-Ag-ZnO composites. (b) Cyclic voltammogram of NSPI and NSPI-Ce-Ag-ZnO composite. (c) FT-IR spectra of NSPI, bare pristine ZnO and NSPI-Ce-Ag-ZnO composite INTERFACIAL CHARGE TRANSFER IN NANOSEMICONDUCTOR-MOLECULE COMPOSITES

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Section: Resultsmentioning

confidence: 82%

Study of interfacial charge transfer in nanosemiconductor–molecule composites

Jayabharathi

Prabhakaran

Karunakaran

et al. 2016

J of Physical Organic Chem

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“…The frequency around 1695 cm −1 corresponds to C=N group of the imidazole and frequency around 1593 cm −1 corresponds to C=C aromatic segments. The peak approximately 3434 cm −1 corresponds to ≥ C−H in the emitter . The frequency around 2958 cm −1 corresponds to CH 2 , CH 3 group of the emitter.…”

Section: Resultsmentioning

confidence: 99%

Star‐Shaped Phenanthroimidazole‐Triphenylamine‐Based Yellow Organic Emitter for Organic Light Emitting Diodes

et al. 2017

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In this work, new star-shaped conjugated organic emitter, namely tris(4-(1-(9,9-diethyl-9H-fluoren-2-yl)-1H-phenanthro [9,10-d]imidazol-2-yl)phenyl)amine (PIFTPA) with donor-p-acceptor (D-p-A) structure, was designed and synthesized by combining three fluoren-phenanthroimidazole arms into a triphenylamine core and characterized using 1 H, 13 C NMR and mass spectrometry. The detailed photophysical, thermal, electrochemical and electroluminescence properties were systematically studied. The organic emitter exhibits high glass transition temperature (230 8C) and high thermal stability with decomposition temperature. Electrochemical analysis reveals that the emitter has distinct oxidation and reduction behaviours. Furthermore, theoretical calculations (DFT) were performed to get a better understanding of the electronic structure. The OLEDs using this emitter as emissive material showed good device performance (6.45 cd/A, 4.39 lm/W, and 3.01%) with yellow emission and a low turn-on voltage (2.87 V). The results demonstrate that TPA integrated with phenthroimdazole plays an important role in the device performance.[a] J.

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“…The characteristic peaks of all nanocomposites were observed at 2θ = 30°, 35.7°, 43°, 53.4°, 57.0° and 62.6°, which are marked by their respective indices ((220), (311), (400), (422), (511) and (440)) [ 61 ]. This showed that the surface functionalization does not change the crystalline phase of MNPs [ 62 ].…”

Section: Resultsmentioning

confidence: 99%

Novel Functionalized Polythiophene-Coated Fe3O4 Nanoparticles for Magnetic Solid-Phase Extraction of Phthalates

2016

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Poly(phenyl-(4-(6-thiophen-3-yl-hexyloxy)-benzylidene)-amine) (P3TArH) was successfully synthesized and coated on the surface of Fe 3 O 4 magnetic nanoparticles (MNPs). The nanocomposites were characterized by Fourier transform infra-red (FTIR), X-ray diffractometry (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, analyzer transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). P3TArH-coated MNPs (MNP@P3TArH) showed higher capabilities for the extraction of commonly-used phthalates and were optimized for the magnetic-solid phase extraction (MSPE) of environmental samples. Separation and determination of the extracted phthalates, namely dimethyl phthalate (DMP), diethyl phthalate (DEP), dipropyl phthalate (DPP), dibutyl phthalate (DBP), butyl benzyl phthalate (BBP), dicyclohexyl phthalate (DCP), di-ethylhexyl phthalate (DEHP) and di-n-octyl phthalate (DNOP), were conducted by a gas chromatography-flame ionization detector (GC-FID). The best working conditions were as follows; sample at pH 7, 30 min extraction time, ethyl acetate as the elution solvent, 500-µL elution solvent volumes, 10 min desorption time, 10-mg adsorbent dosage, 20-mL sample loading volume and 15 g¨L´1 concentration of NaCl. Under the optimized conditions, the analytical performances were determined with a linear range of 0.1-50 µg¨L´1 and a limit of detection at 0.08-0.468 µg¨L´1 for all of the analytes studied. The intra-day (n = 7) and inter-day (n = 3) relative standard deviations (RSD%) of three replicates were each demonstrated in the range of 3.7-4.9 and 3.0-5.0, respectively. The steadiness and reusability studies suggested that the MNP@P3TArH could be used up to five cycles. The proposed method was executed for the analysis of real water samples, namely commercial bottled mineral water and bottled fresh milk, whereby recoveries in the range of 68%-101% and RSD% lower than 7.7 were attained.

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Optical and theoretical studies on Fe₃O₄–imidazole nanocomposite and clusters

Abstract: The larger surface curvature of nanocrystals reduces steric hindrance between surface binding molecules and provides a larger number of unsaturated dangling bonds on the nanocrystal surface.

Cited by 16 publications

References 72 publications

Study of interfacial charge transfer in nanosemiconductor–molecule composites

Study of interfacial charge transfer in nanosemiconductor–molecule composites

Star‐Shaped Phenanthroimidazole‐Triphenylamine‐Based Yellow Organic Emitter for Organic Light Emitting Diodes

Novel Functionalized Polythiophene-Coated Fe3O4 Nanoparticles for Magnetic Solid-Phase Extraction of Phthalates

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Optical and theoretical studies on Fe3O4–imidazole nanocomposite and clusters

Abstract: The larger surface curvature of nanocrystals reduces steric hindrance between surface binding molecules and provides a larger number of unsaturated dangling bonds on the nanocrystal surface.

Cited by 16 publications

References 72 publications

Study of interfacial charge transfer in nanosemiconductor–molecule composites

Study of interfacial charge transfer in nanosemiconductor–molecule composites

Star‐Shaped Phenanthroimidazole‐Triphenylamine‐Based Yellow Organic Emitter for Organic Light Emitting Diodes

Novel Functionalized Polythiophene-Coated Fe3O4 Nanoparticles for Magnetic Solid-Phase Extraction of Phthalates

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Optical and theoretical studies on Fe₃O₄–imidazole nanocomposite and clusters