A covalent organic framework onion structure. (November 2022)
- Record Type:
- Journal Article
- Title:
- A covalent organic framework onion structure. (November 2022)
- Main Title:
- A covalent organic framework onion structure
- Authors:
- Zheng, Qi
Li, Xinle
Zhang, Qiubo
Lee, Daewon
Mao, Haiyan
Yang, Chongqing
Bustillo, Karen C.
Reimer, Jeffrey A.
Liu, Yi
Jiang, Jinyang
Zheng, Haimei - Abstract:
- Graphical abstract: This paper demonstrates a low-temperature solvothermal method of nitrogen-rich covalent organic framework (COF) onions. The atomic structure and the bonding features are revealed by high resolution transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS). The novel COF onion provides potential applications in photocatalysts considering its suitable bandgap value of 2.56 eV. Abstract: Achieving hierarchical nanomaterials from a bottom-up approach remains challenging. Here, we report a closed-cage, onion nanostructure of covalent organic framework (COF) obtained through a low-temperature solvothermal synthesis. Atomic resolution transmission electron microscopy revealed the atomic arrangement in this COF onion, in which rich nitrogen was uniformly embedded in the periodic porous graphitic framework. The COF onion structure displayed graphitic features at a 0.33 nm interlayer spacing with Van der Waals interactions predominated between the layers. The onion layers exhibited significant heterogeneity in layer stacking by adopting a combination of different stacking modes. Defects were also found, such as five- or seven-member rings deviating from the perfect hexagonal lattice. These geometrical defects resulted in curving the 2D layers, which may have promoted the formation of onion nanostructures through a layer-by-layer attachment. We constructed a corresponding model that predicts COF onion properties. This novel onion exhibitedGraphical abstract: This paper demonstrates a low-temperature solvothermal method of nitrogen-rich covalent organic framework (COF) onions. The atomic structure and the bonding features are revealed by high resolution transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS). The novel COF onion provides potential applications in photocatalysts considering its suitable bandgap value of 2.56 eV. Abstract: Achieving hierarchical nanomaterials from a bottom-up approach remains challenging. Here, we report a closed-cage, onion nanostructure of covalent organic framework (COF) obtained through a low-temperature solvothermal synthesis. Atomic resolution transmission electron microscopy revealed the atomic arrangement in this COF onion, in which rich nitrogen was uniformly embedded in the periodic porous graphitic framework. The COF onion structure displayed graphitic features at a 0.33 nm interlayer spacing with Van der Waals interactions predominated between the layers. The onion layers exhibited significant heterogeneity in layer stacking by adopting a combination of different stacking modes. Defects were also found, such as five- or seven-member rings deviating from the perfect hexagonal lattice. These geometrical defects resulted in curving the 2D layers, which may have promoted the formation of onion nanostructures through a layer-by-layer attachment. We constructed a corresponding model that predicts COF onion properties. This novel onion exhibited a bandgap value of 2.56 eV, resembling other carbon-based nanomaterials, suggesting potential applications in sensors, photocatalysts, and nanoelectronics. … (more)
- Is Part Of:
- Materials today. Volume 60(2022)
- Journal:
- Materials today
- Issue:
- Volume 60(2022)
- Issue Display:
- Volume 60, Issue 2022 (2022)
- Year:
- 2022
- Volume:
- 60
- Issue:
- 2022
- Issue Sort Value:
- 2022-0060-2022-0000
- Page Start:
- 98
- Page End:
- 105
- Publication Date:
- 2022-11
- Subjects:
- CN onion nanostructure -- Covalent organic framework (COF) -- Atomic bonding -- Stacking modes -- Transmission electron microscopy (TEM)
Materials science -- Periodicals
Metallurgy -- Periodicals
Metal-work -- Periodicals
Biomedical and Dental Materials -- Periodicals
Manufactured Materials -- Periodicals
Metals -- Periodicals
620.11 - Journal URLs:
- http://www.sciencedirect.com/science/journal/13697021 ↗
http://www.materialstoday.com/home.htm ↗
http://www.elsevier.com/journals ↗ - DOI:
- 10.1016/j.mattod.2022.09.002 ↗
- Languages:
- English
- ISSNs:
- 1369-7021
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5396.507000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 24467.xml