Surfactant-Assisted Synthesis of Tetragonal Porphyrin Microparticles
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.309
Surfactant-Assisted Synthesis of Tetragonal Porphyrin Microparticles Kaifu Bian1, Leanne Alarid1, Casey Karler1, Austin Hwang1, Dongmei Ye1 and Hongyou Fan1,2,*
1
Sandia National Laboratories, Albuquerque, New Mexico, 87123
2
The University of New Mexico Center for Micro-Engineered Materials, Albuquerque, New Mexico 87131
ABSTRACT
In an effort to utilize their unique photoactive properties, porphyrin monomers were assembled into tetragonal microparticles by a surfactant-assisted neutralization method through the cooperative interactions between the porphyrin building blocks including π-π stacking, J-aggregation and metal-ligand coordination. Electron microscopy characterization in combination with x-ray diffraction confirmed the three-dimensional ordered tetragonal microstructures with stable crystalline frameworks and well defined external surface morphology. Optical absorption and fluorescence spectroscopy revealed enhanced absorbance properties as compared with the raw porphyrin material, favourable for chromophore excitation and energy transport. With active and responsive optical properties, these new porphyrin microparticles look to serve as promising components for a wide range of applications including sensing, diagnostics, solar cells, and optoelectronic devices.
INTRODUCTION Porphyrins belong to a class of optically active biomacromolecular ring compounds which play critical roles in many important biological processes including photosynthesis and blood oxygen transport, and also serve as colorful pigments covering a wide range of the visible spectrum.1, 2 Nanoscale porphyrin structures including nanorods, nanowires, and nanosheets are of great interest and has previously been investigated for functionalization of their unique physical properties such as high surface area, low density, exciton formation and transport, and spectral absorbance in a controlled range of wavelengths.3-6 In an effort to utilize these properties for important applications in sensing, catalysis, and nanoelectronics, extensive efforts have been made to fabricate functional hierarchical nanostructures from individual porphyrin building blocks. Through careful tuning of experimental parameters influencing cooperative self-assembly, the morphology, function, shape, and size of the product nanomaterial may be readily
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controlled. We herein report a surfactant-assisted acid-base neutralization method for the synthesis of pure three-dimensional (3D) tetragonal microparticles from tin metalloporphyrin (SnTPyP). These microparticles have the potential to be used in optoelectronic devices as a uniform, robust and colloidal-processable building block. It could also be used in catalysis applications such as water splittin
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