@article {47318,
	title = {Nanoporous covalent organic framework embedded with Fe/Fe3O4 nanoparticles as air-stable low-density nanomagnets},
	journal = {ACS Applied Nano Materials},
	volume = {3},
	year = {2020},
	month = {SEP },
	pages = {9088-9096},
	type = {Article},
	abstract = {<p>Covalent organic frameworks (COFs) made of light atoms such as H, C, N, and O with a significant void-to-framework ratio are excellent low-density supports for nanoparticles (nPs). Their framework can be precoded with heteroatoms to ensure binding with metallic nanoclusters. With these advantages, if controlled amounts of magnetic nPs are anchored to them, they can yield low-density organic-inorganic nanomagnets. Their organic nature facilitates fusion with bulk materials such as paper/textile to enable bulk composites with well-dispersed low-density magnets, which have potential for defense and next-generation aviation applications. Herein, we have grown small Fe/Fe3O4 nPs (5-18 wt \%) inside a COF. Interestingly, 300 mg of this organic-inorganic framework material (containing 50 mg of nPs) can lift a vial of similar to 15,000 mg (300 times heavier). Also, the hydrophobic COF wraps around the Fe/Fe3O4 nanocluster retaining its room-temperature magnetic character even after 1 year, while the naked nPs lose it within a few days because of air oxidation. Bulk composites with paper and polymers have been made using this low-density Fe-COF to demonstrate their processability.</p>},
	keywords = {air-stable nanomagnets, Covalent organic framework, Fe/Fe3O4 nanoparticles, low-density nanomagnets, magnetic rayon, nanoporous COF},
	issn = {2574-0970},
	doi = {10.1021/acsanm.0c01762},
	author = {Kushwaha, Rinku and Kaleeswaran, Dhananjayan and Haldar, Sattwick and Chakraborty, Debanjan and Mullangi, Dinesh and Borah, Aditya and Vinod, Chathakudath P. and Murugavel, Ramaswamy and Vaidhyanathan, Ramanathan}
}
@article {48183,
	title = {Synergistic electronic effects in AuCo nanoparticles stabilized in a triazine-based covalent organic framework: a catalyst for methyl orange and methylene blue reduction},
	journal = {ACS Applied Nano Materials},
	volume = {5},
	year = {2022},
	month = {APR },
	pages = {4744-4753},
	type = {Article},
	abstract = {<p>
	Developing stable active catalysts for reducing water-soluble pollutants is a desirable target. In this pursuit, we have functionalized covalent organic frameworks (COFs) with gold (Au) and cobalt (Co) nanoparticles via a one-step aqueous synthesis process, and their catalytic activity in reducing methyl orange and methylene blue is examined. Operando absorbance measurements of methyl orange (anionic dye) reduction revealed AuCoCOF (1.3 Au/1.0 Co) to have superior kinetics over many other catalysts, which typically require additional external stimuli (e.g., photons) and higher catalyst loadings. After confirming the homogeneous dispersion of the nanoparticles on the COF support using three-dimensional (3D) tomography and material stability through powder X-ray diffraction (PXRD), infrared (IR), and thermal studies, we investigated their redox activity. Cyclic voltammetry (CV) confirmed the involvement of both metals in the redox process, while spectroelectrochemical measurements show that their activity and kinetics remain unaltered by an applied potential. Solid-state UV measurements reveal that the neat COF is a semiconductor with a large band gap (2.8 eV), which is substantially lowered when loaded with cobalt nanoparticles (2.2 eV for CoCOF). The electronic synergy between Au and Co nanoparticles further reduces the band gap of AuCoCOF (1.9 eV). Thus, there is a definite advantage in doping non-noble metal nanoparticles into a noble metal lattice and nanoconfining them into a porous COF support. Our study highlights the significance of bimetallic COF-supported nanocatalysts, wherein one can engage each component toward targeted applications that demand redox activity with favorable kinetics.</p>
},
	keywords = {AuCoCOF, band gaps, Covalent organic framework, methyl orange reduction, Nanoparticles, UV-vis spectroscopy},
	doi = {10.1021/acsanm.1c04212},
	author = {Devulapalli, Venkata Swaroopa Datta and Kushwaha, Rinku and Ovalle, Edwin and Singh, Himan Dev and Shekhar, Pragalbh and Chakraborty, Debanjan and Vinod, Chathakudath Prabhakaran and Vaidhyanathan, Ramanathan and Borguet, Eric}
}
