Controllable Synthesis of Cobalt Porphyrin Nanocrystals through Micelle Confinement Self-Assembly
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.269
Controllable Synthesis of Cobalt Porphyrin Nanocrystals through Micelle Confinement Self-Assembly Sudi Chena, Xitong Rena, Shufang Tiana*, Jiajie Sunb*, Feng Baia* a
Key Laboratory for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology, School of Materials Science and Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng 475004, China
b
School of Physics and Electronics, Henan University, Kaifeng 475004, China
CORRESPONDING AUTHORS *Email: [email protected] (S.F. Tian), [email protected] (J.J. Sun), [email protected] (F. Bai)
Abstract
The self-assembly of optically active building blocks into functional nanocrystals as highactivity photocatalysts is a key in the field of photocatalysis. Cobalt porphyrin with abundant catalytic properties is extensively studied in photocatalytic water oxidation and CO2 reduction. Here, we present the fabrication of cobalt porphyrin nanocrystals through a surfactant-assisted interfacial self-assembly process using Co-tetra(4-pyridyl) porphyrin as building block. The self-assembly process relies on the combined noncovalent interactions such as π-π stacking and axial Co-N coordination between individual porphyrin molecules within surfactant micelles. Tuning different reaction conditions (temperature, the ratio of co-solvent DMF) and types of surfactant, various nanocrystals with well-defined 1D to 3D morphologies such as nanowires, nanorods and nano hexagonal prism were obtained. Due to the ordered accumulation of molecules, the nanocrystals exhibit the properties of the enhanced capability of visible light capture and 1
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can conduce to improve the transport and separation efficiency of the photogenerated carriers, which is important for photocatalysis. Further studies of photocatalytic CO2 reduction are being performed to address the relationship between the size and shape of the nanocrystals with the photocatalytic activity.
INTRODUCTION Preparation of highly active nanocrystalline materials is very important in the field of nano-catalysis [1-4]. Numerous methods have been developed to synthesize a variety of nanocrystals with well-defined morphology [5], among which molecular selfassemble is an efficient way to fabricate organic nanostructures with ordered intermolecular arrangement [6-12] .The precursor molecules are accumulated orderly to form thermodynamically stable structures by weak interactions such as intermolecular hydrogen bond, molecular axial coordination and van der Waals forces during the process of self-assembly [13, 14]. The ordered self-assembly alwa
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