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Title: Inducing porosity and growing carbon nanofibers in ferroin perchlorate: An example of morphological transitions in coordination complexes

Abstract

Inducing porosity in solid coordination complex crystals, which are an important class of catalysts, is critical for many applications where a high surface area is required. However, unlike metal organic frameworks (MOFs), fabrication of porous coordination crystals remains a significant challenge. Here we demonstrate a simple method to produce and modulate porosity in coordination complex crystals using ferroin perchlorate, a model system that combines a common ionic complex with a very reactive counter-ion. Using thermal chemical vapor deposition (CVD), we show that by annealing ferroin perchlorate crystals at 350 °C under a flow of ethylene, hydrogen, argon, and oxygen, we induced pores in the crystal. We demonstrate that small amounts of oxygen, which may combine with hydrogen to form water, are essential for pore formation. We also demonstrate that pore size and density can be easily controlled by varying the ethylene flow. Upon raising the annealing temperature to 500 °C, we observed a second transition in which carbon nanofibers (CNFs) grew from the porous crystal. This approach represents a simple and effective method for the synthesis of porous materials with good control over pore size and density. It also enables the synthesis of complex networks of nanostructures (in our casemore » CNFs) by simply varying process parameters such as temperature and gas flows. This represents an important advance for the fabrication of porous coordination complex crystals. - Graphical abstract: Annealing ferroin perchlorate at 350 °C induces porosity in the complex while annealing at 500 °C leads to the additional growth of carbon nanofibers Display Omitted.« less

Authors:
; ;  [1]; ;  [2];  [1]
  1. Department of Chemistry, Bar Ilan Institute for Nanotechnology and Advanced materials (BINA), Bar Ilan University, Ramat Gan 52900 (Israel)
  2. Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235 (United States)
Publication Date:
OSTI Identifier:
22742026
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 253; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANNEALING; CARBON FIBERS; CHEMICAL VAPOR DEPOSITION; COMPLEXES; CRYSTAL GROWTH; FERROIN; GAS FLOW; NANOFIBERS; ORGANOMETALLIC COMPOUNDS; PERCHLORATES; POROSITY; POROUS MATERIALS; SURFACE AREA; SYNTHESIS

Citation Formats

Avraham, Efrat Shawat, Fleker, Ohad, Benisvy, Laurent, Oakes, Landon, Pint, Cary L., and Nessim, Gilbert D. Inducing porosity and growing carbon nanofibers in ferroin perchlorate: An example of morphological transitions in coordination complexes. United States: N. p., 2017. Web. doi:10.1016/J.JSSC.2017.05.021.
Avraham, Efrat Shawat, Fleker, Ohad, Benisvy, Laurent, Oakes, Landon, Pint, Cary L., & Nessim, Gilbert D. Inducing porosity and growing carbon nanofibers in ferroin perchlorate: An example of morphological transitions in coordination complexes. United States. doi:10.1016/J.JSSC.2017.05.021.
Avraham, Efrat Shawat, Fleker, Ohad, Benisvy, Laurent, Oakes, Landon, Pint, Cary L., and Nessim, Gilbert D. Fri . "Inducing porosity and growing carbon nanofibers in ferroin perchlorate: An example of morphological transitions in coordination complexes". United States. doi:10.1016/J.JSSC.2017.05.021.
@article{osti_22742026,
title = {Inducing porosity and growing carbon nanofibers in ferroin perchlorate: An example of morphological transitions in coordination complexes},
author = {Avraham, Efrat Shawat and Fleker, Ohad and Benisvy, Laurent and Oakes, Landon and Pint, Cary L. and Nessim, Gilbert D.},
abstractNote = {Inducing porosity in solid coordination complex crystals, which are an important class of catalysts, is critical for many applications where a high surface area is required. However, unlike metal organic frameworks (MOFs), fabrication of porous coordination crystals remains a significant challenge. Here we demonstrate a simple method to produce and modulate porosity in coordination complex crystals using ferroin perchlorate, a model system that combines a common ionic complex with a very reactive counter-ion. Using thermal chemical vapor deposition (CVD), we show that by annealing ferroin perchlorate crystals at 350 °C under a flow of ethylene, hydrogen, argon, and oxygen, we induced pores in the crystal. We demonstrate that small amounts of oxygen, which may combine with hydrogen to form water, are essential for pore formation. We also demonstrate that pore size and density can be easily controlled by varying the ethylene flow. Upon raising the annealing temperature to 500 °C, we observed a second transition in which carbon nanofibers (CNFs) grew from the porous crystal. This approach represents a simple and effective method for the synthesis of porous materials with good control over pore size and density. It also enables the synthesis of complex networks of nanostructures (in our case CNFs) by simply varying process parameters such as temperature and gas flows. This represents an important advance for the fabrication of porous coordination complex crystals. - Graphical abstract: Annealing ferroin perchlorate at 350 °C induces porosity in the complex while annealing at 500 °C leads to the additional growth of carbon nanofibers Display Omitted.},
doi = {10.1016/J.JSSC.2017.05.021},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 253,
place = {United States},
year = {2017},
month = {9}
}