Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene
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Electrochemical exfoliation is an efficient and scalable method to obtain liquid-phase graphene. Graphene in solution, obtained through electrochemical exfoliation or other methods, is typically polydisperse, containing particles of various sizes, which is not optimal for applications. We employed cascade centrifugation to select specific particle sizes in solution and prepared thin films from those graphene particles using the Langmuir–Blodgett assembly. Employing centrifugation speeds of 3, 4, and 5 krpm, further diluting the solutions in different volumes of solvent, we reliably and consistently obtained films of tunable thickness. We show that there is a limit to how thin these films can be, which is imposed by the percolation threshold. The percolation threshold is quantitatively compared to results found in literature that are obtained using other, more complex graphene film fabrication methods, and is found to occur with a percolation exponent and percolative figure of merit tha...t are of the same order as results in literature. A maximum optical transparency of 82.4% at a wavelength of 660 nm is obtained for these films, which is in agreement with earlier works on Langmuir–Blodgett assembled ultrasonic-assisted liquid-phase exfoliated graphene. Our work demonstrates that films that are in all respects on par with films of graphene obtained through other solution-based processes can be produced from inexpensive and widely available centrifugal post-processing of existing commercially available solutions of electrochemically exfoliated graphene. The demonstrated methodology will lower the entry barriers for new research and industrial uses, since it allows researchers with no exfoliation experience to make use of widely available graphene materials.
Keywords:
2d materials / Cascade centrifugation / Graphene / Langmuir–blodgett deposition / Transparent conductorsSource:
Beilstein Journal of Nanotechnology, 2022, 13, 666-674Publisher:
- Germany : Beilstein-Institut Zur Forderung der Chemischen Wissenschaften
Funding / projects:
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200026 (University of Belgrade, Institute of Chemistry, Technology and Metallurgy - IChTM) (RS-200026)
- The NATO Science for Peace and Security Program through project SP4LIFE (G5825)
- Gramulsen - Graphene-Based Wearable Multiparameter Sensor (RS-6057070)
DOI: 10.3762/bjnano.13.58
ISSN: 2190-4286
PubMed: 35957672
WoS: 000829024800001
Scopus: 2-s2.0-85135838084
Institution/Community
IHTMTY - JOUR AU - Vićentić, Teodora AU - Andrić, Stevan AU - Rajić, Vladimir AU - Spasenović, Marko PY - 2022 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/5473 AB - Electrochemical exfoliation is an efficient and scalable method to obtain liquid-phase graphene. Graphene in solution, obtained through electrochemical exfoliation or other methods, is typically polydisperse, containing particles of various sizes, which is not optimal for applications. We employed cascade centrifugation to select specific particle sizes in solution and prepared thin films from those graphene particles using the Langmuir–Blodgett assembly. Employing centrifugation speeds of 3, 4, and 5 krpm, further diluting the solutions in different volumes of solvent, we reliably and consistently obtained films of tunable thickness. We show that there is a limit to how thin these films can be, which is imposed by the percolation threshold. The percolation threshold is quantitatively compared to results found in literature that are obtained using other, more complex graphene film fabrication methods, and is found to occur with a percolation exponent and percolative figure of merit that are of the same order as results in literature. A maximum optical transparency of 82.4% at a wavelength of 660 nm is obtained for these films, which is in agreement with earlier works on Langmuir–Blodgett assembled ultrasonic-assisted liquid-phase exfoliated graphene. Our work demonstrates that films that are in all respects on par with films of graphene obtained through other solution-based processes can be produced from inexpensive and widely available centrifugal post-processing of existing commercially available solutions of electrochemically exfoliated graphene. The demonstrated methodology will lower the entry barriers for new research and industrial uses, since it allows researchers with no exfoliation experience to make use of widely available graphene materials. PB - Germany : Beilstein-Institut Zur Forderung der Chemischen Wissenschaften T2 - Beilstein Journal of Nanotechnology T1 - Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene VL - 13 SP - 666 EP - 674 DO - 10.3762/bjnano.13.58 ER -
@article{ author = "Vićentić, Teodora and Andrić, Stevan and Rajić, Vladimir and Spasenović, Marko", year = "2022", abstract = "Electrochemical exfoliation is an efficient and scalable method to obtain liquid-phase graphene. Graphene in solution, obtained through electrochemical exfoliation or other methods, is typically polydisperse, containing particles of various sizes, which is not optimal for applications. We employed cascade centrifugation to select specific particle sizes in solution and prepared thin films from those graphene particles using the Langmuir–Blodgett assembly. Employing centrifugation speeds of 3, 4, and 5 krpm, further diluting the solutions in different volumes of solvent, we reliably and consistently obtained films of tunable thickness. We show that there is a limit to how thin these films can be, which is imposed by the percolation threshold. The percolation threshold is quantitatively compared to results found in literature that are obtained using other, more complex graphene film fabrication methods, and is found to occur with a percolation exponent and percolative figure of merit that are of the same order as results in literature. A maximum optical transparency of 82.4% at a wavelength of 660 nm is obtained for these films, which is in agreement with earlier works on Langmuir–Blodgett assembled ultrasonic-assisted liquid-phase exfoliated graphene. Our work demonstrates that films that are in all respects on par with films of graphene obtained through other solution-based processes can be produced from inexpensive and widely available centrifugal post-processing of existing commercially available solutions of electrochemically exfoliated graphene. The demonstrated methodology will lower the entry barriers for new research and industrial uses, since it allows researchers with no exfoliation experience to make use of widely available graphene materials.", publisher = "Germany : Beilstein-Institut Zur Forderung der Chemischen Wissenschaften", journal = "Beilstein Journal of Nanotechnology", title = "Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene", volume = "13", pages = "666-674", doi = "10.3762/bjnano.13.58" }
Vićentić, T., Andrić, S., Rajić, V.,& Spasenović, M.. (2022). Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene. in Beilstein Journal of Nanotechnology Germany : Beilstein-Institut Zur Forderung der Chemischen Wissenschaften., 13, 666-674. https://doi.org/10.3762/bjnano.13.58
Vićentić T, Andrić S, Rajić V, Spasenović M. Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene. in Beilstein Journal of Nanotechnology. 2022;13:666-674. doi:10.3762/bjnano.13.58 .
Vićentić, Teodora, Andrić, Stevan, Rajić, Vladimir, Spasenović, Marko, "Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene" in Beilstein Journal of Nanotechnology, 13 (2022):666-674, https://doi.org/10.3762/bjnano.13.58 . .