Shape dependent properties of CdSe nanostructures

Aslam, Farzana; Ferber, Christian von

doi:10.1016/j.chemphys.2009.07.005

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…The morphology of the semiconductor micro/nanostructures precisely lies at the heart of the physical and the chemical properties of the functional micro/nanomaterials. − For instance, M. A. EI-Sayed and co-workers demonstrated that Pt nanoparticles of different morphologies have different facets, which further led to the different catalytic activities for the same chemical reaction . More significantly, the Ag nanocrystals with controlled morphologies have contributed to a distinguished discovery of morphology-dependent and size-dependent plasmon resonance. − As is indicated, the performance of these optoelectronic devices is attributed with the morphology of these micro/nanoscale fabricated structures.…”

Section: Introductionmentioning

confidence: 99%

Tunable Morphology of the Self-Assembled Organic Microcrystals for the Efficient Laser Optical Resonator by Molecular Modulation

Wang

et al. 2014

J. Am. Chem. Soc.

101

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Organic single-crystalline micro/nanostructures can effectively generate and carry photons due to their smooth morphologies, high photoluminescence quantum efficiency, and minimized defects density and therefore are potentially ideal building blocks for the optical circuits in the next generation of miniaturized optoelectronics. However, the tailor-made organic molecules can be generally obtained by organic synthesis, ensuring that the organic molecules aggregate in a specific form and generate micro/nanostructures with desirable morphology and therefore act as the efficient laser optical resonator remains a great challenge. Here, the molecular modulation of the morphology on the laser optical resonator properties has been investigated through the preparation of the elongated hexagonal microplates (PHMs) and the rectangular microplates (ORMs), respectively, from two model isomeric organic molecules of 1,4-bis(4-methylstyryl)benzene (p-MSB) and 1,4-bis(2-methylstyryl)benzene (o-MSB). Significantly, fluorescence resonance phenomenon was only observed in the individual ORM other than the PHM. It indicates that the rectangular resonators possess better light-confinement property over the elongated hexagonal resonators. More importantly, optically pumped lasing action was observed in the o-MSB rectangular morphology microplates resonator with a high Q ≈ 1500 above a threshold of ∼540 nJ/cm(2). The excellent optical properties of these microstructures are associated with the morphology, which can be precisely modulated by the organic molecular structure. These self-assembled organic microplates with different morphologies can contribute to the distinct functionality of photonics elements in the integrated optical circuits at micro/nanoscale.

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Section: Introductionmentioning

confidence: 99%

Tunable Morphology of the Self-Assembled Organic Microcrystals for the Efficient Laser Optical Resonator by Molecular Modulation

Wang

et al. 2014

J. Am. Chem. Soc.

101

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“…Micro- and nanostructures of materials have impressive footprint on the continued development of materials science 1 2 3 4 5 6 7 8 9 . The shape and the size of these micro/nanostructures precisely lie at the heart of the physical and chemical properties of the functional micro/nanomaterials 10 11 12 13 14 15 16 . In recent decades, tremendous efforts have been made towards the development of synthetic procedures for inorganic compounds, such as Ag, Pd, and ZnO 17 18 19 .…”

mentioning

confidence: 99%

Shape-Engineering of Self-Assembled Organic Single Microcrystal as Optical Microresonator for laser Applications

Wang

Liao

Lü

et al. 2014

Sci Rep

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Single micro/nanocrystals based on π-conjugated organic molecules have caused tremendous interests in the optoelectronic applications in laser, optical waveguide, nonlinear optics, and field effect transistors. However, the controlled synthesis of these organic micro/nanocrystals with regular shapes is very difficult to achieve, because the weak interaction (van der Waals' force, ca. 5 kJ/mol) between organic molecules could not dominate the kinetic process of crystal growth. Herein, we develop an elaborate strategy, selective adhesion to organic crystal plane by the hydrogen-bonding interaction (ca. 40 kJ/mol), for modulating the kinetic process of the formation of microcrystal, which leads to the self-assembly of one organic molecule 3-[4-(dimethylamino)phenyl]-1-(2-hy-droxyphenyl)prop-2-en-1-on (HDMAC) into one-dimensional (1D) microwires and 2D microdisks respectively. Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator. More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature. These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

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“…Nanoparticles, or nanometer scale crystalline materials, have been gaining traction throughout organic semiconductor applications. Many of these are driven by the unique ability of semiconductor nanoparticles to exhibit tunable bandgaps through size control and HOMO/LUMO level adjustment through the use of various inorganic semiconducting materials . As sensitizers in photorefractive polymers, these materials are also interesting for their possible use as photogeneration media in the infrared, a range at which many other sensitizing materials have limited absorptivity and photogeneration efficiency.…”

Section: Photorefractive Polymersmentioning

confidence: 99%

Photorefractive polymers for holography

Lynn

Blanche

Peyghambarian

2013

J Polym Sci B Polym Phys

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This review describes the current state-of-the-art of photorefractive polymers for holography. The analysis of this rich field begins with a brief historical perspective followed by descriptions of prevailing physical models relating basic parameters of the polymer constituents to the bulk response of the final device. Methods for probing these responses and the underlying phenomena are discussed followed by an overview of the recent holographic applications of photorefractive polymers.

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Shape dependent properties of CdSe nanostructures

Cited by 10 publications

References 26 publications

Tunable Morphology of the Self-Assembled Organic Microcrystals for the Efficient Laser Optical Resonator by Molecular Modulation

Tunable Morphology of the Self-Assembled Organic Microcrystals for the Efficient Laser Optical Resonator by Molecular Modulation

Shape-Engineering of Self-Assembled Organic Single Microcrystal as Optical Microresonator for laser Applications

Photorefractive polymers for holography

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