19-JPC C (original) (raw)
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The Journal of Physical Chemistry C, 2010
Nano/microstructure fabrication of 2-cyano-3(4-(diphenylamino)phenyl) acrylic acid (CDPA), an organic optoelectronic material, via a simple reprecipitation method produces particles with a different morphology, phase, and structure and a tailored luminescence. Spherical amorphous, diamond, and multifaceted microcrystals of CDPA were obtained by optimizing the fabrication conditions. CDPA with rod-like morphology was produced on the introduction of polymer additives to the growth solution. A polymorph of CDPA, not observed in the usual solution crystallization process, was obtained as 1D nanowires (200-400 nm (width) and 3-20 µm (length)). Powder X-ray diffraction and optical studies demonstrate the polymorphic structure of the nanowires. Scanning electron and confocal fluorescence microscopy, respectively, were used to demonstrate the different morphologies of fabricated nano/microstructures and the luminescence tuning (from 604 to 519 nm).
Journal of Physical Organic Chemistry, 2010
Nano/microstructure fabrication of 2-cyano-3(4-(diphenylamino)phenyl) acrylic acid (CDPA), an organic optoelectronic material, via a simple reprecipitation method produces particles with a different morphology, phase, and structure and a tailored luminescence. Spherical amorphous, diamond, and multifaceted microcrystals of CDPA were obtained by optimizing the fabrication conditions. CDPA with rod-like morphology was produced on the introduction of polymer additives to the growth solution. A polymorph of CDPA, not observed in the usual solution crystallization process, was obtained as 1D nanowires (200-400 nm (width) and 3-20 µm (length)). Powder X-ray diffraction and optical studies demonstrate the polymorphic structure of the nanowires. Scanning electron and confocal fluorescence microscopy, respectively, were used to demonstrate the different morphologies of fabricated nano/microstructures and the luminescence tuning (from 604 to 519 nm).
Journal of The Iranian Chemical Society, 2019
Density functional studies of structural and optoelectronic properties of wurtzite Cd x Zn 1-x O ternary alloys have been carried out with modified Becke-Johnson (mBJ)-generalized gradient approximation (GGA) functional. Each stable wurtzite specimen under consideration is a direct band gap (C-C) semiconductor. Lattice constants (a, c) increases, but bulk modulus and fundamental band gap (E g) decreases nonlinearly with increasing Cd-composition x. The frequency responses of several optical parameters, various optical constants and their correlation with band gap have been computed. Each specimen shows optical anisotropy. The O-2p ? Cd-6 s, 5p & Zn-5 s, 4p optical excitations contribute intense peak(s) in each dielectric function spectra. Specimen with larger band gap possesses lower static dielectric constant, static refractive index and static reflectivity, but higher critical point energy in each of the e 2 ðxÞ, kðxÞ, aðxÞ and rðxÞspectra and vice versa.
Materials Letters, 2006
Liquid phase deposition starting from solutions of 7,7′,8,8′ Tetracyanoquinodimethane (TCNQ) is used to grow oriented aggregates consisting of submicron-sized width wires. Spectrophotometric analysis shows that the as-deposited films consist of neutral TCNQ and have polarization dependent optical properties. The TCNQ microstructures react when exposed to organic solvent vapours, forming charge-transfer complexes characterized by a gradual and partial reduction of the organic molecules from the neutral to the monovalent ionic state. The morphology of the solution deposited films before and after the vapour treatment is investigated by means of optical microscopy, and Scanning Electron Microscopy (SEM).
Fabrication of Homogeneous Hybrid Nanorod of Organic/Inorganic Semiconductor Materials
Journal of Physical Chemistry C, 2008
Homogeneous hybrid organic/inorganic nanorods composed of OPV3 and CdS have been fabricated by a facile template method. The structures of CdS-OPV3 hybrid nanorods have been investigated by field emission scanning electron microscope (SEM), transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and confocal laser scanning microscopy (CLSM). It was found that inorganic semiconductor CdS and organic semiconductor OPV3 homogeneously distributed into the hybrid nanorod. Fluorescence spectroscopy was also used to characterize the optical property of the CdS-OPV3 nanorods. And such prepared CdS-OPV3 homogeneous hybrid nanorods exhibit different optical properties compared with individual component CdS nanorods and OPV3 nanorods. The as-prepared new kind of homogeneous hybrid organic/inorganic semiconductor nanorods are potential candidates for nanoscale electronic and photonic devices.
Electroluminescent nanocomposites based on molecular crystals for polymer optoelectronics. Part 1
Inorganic Materials: Applied Research, 2011
Experimental data on electroluminescence of new light emitting materials, semiconducting organic polymers doped with nanosized J aggregates of cyanine dyes, are described. OLED structures are considered. New light emitting diode structures are developed. Polyaniline electroluminescence band is observed. High resolution atomic force microscopy (AFM) is used to study J aggregate structures. The AFM procedure is improved to increase accuracy in determination of J aggregate dimensions. Certain supramo lecular species are long ribbons with high flexibility.
2006
Our research is focused on deciphering the physical properties that govern behavior of nanostructured materials and applying the findings to development of practical, active technologies. With focus on organic and inorganic-nanocrystal electronic and optoelectronic structures, to date we demonstrated efficient LEDs, lasers, solar cells, photodetectors, transistors, memory cells, and chemical sensors. In addition to working on small-molecularweight van-der-Waals-bonded organic thin films, we also examine hybrid organic/inorganic structures, polymer solids, and self-assembled materials. Our work tends towards the nano-scale where through development of new patterning and materials growth techniques we aim to reduce the size of active device layers from the present nano-scale thickness of organic thin films to that of single molecules or atomic clusters. Our ultimate goal is to utilize the nano-scale functionality of molecules, polymers, and inorganic/organic hybrid assemblies in practical nano-scale devices and both small-and large-area integrated systems.
Preparation and photophysical properties of nanostructured 9-cyanoanthracene
Chemical Physics Letters, 2005
This Letter reports a new method (refluxed) along with the conventional sonication method for preparation of nanoparticles of well-known electron acceptor 9-cyanoanthracene (9CNA). The photophysical properties of the nanostructured 9CNA, prepared from both the methods were investigated by steady-state and time resolved spectroscopic techniques. Nanoclusters, made from the refluxed method, are mostly one-dimensional wire-like structure whereas in the sonication method formations of both one and three-dimensional nanocluster of 9CNA were confirmed from TEM investigation. Irradiation of both the 9CNA nano dispersions results in formations of both the delocalized p-electronic (polaron-exciton) and the locally excited states.