TY  - JOUR
AU  - Tomašević-Ilić, Tijana
AU  - Škoro, Nikola
AU  - Jovanović, Đorđe
AU  - Puač, Nevena
AU  - Spasenović, Marko
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7210
AB  - Graphene films prepared from solution and deposited by Langmuir–Blodgett self-assembly technique (LBSA) were treated with radio-frequency (13.56 MHz) nitrogen plasma in order to investigate the influence of the time of nitrogen plasma exposure on the work function, sheet resistance, and surface morphology of LBSA graphene films. Kelvin probe force microscopy and sheet resistance measurements confirm nitrogen functionalization of our films, with the Fermi level shifting in a direction that indicates binding to a pyridinic and/or pyrrolic site. Upon 1 min of nitrogen plasma exposure, the sheet resistance decreases and there is no obvious difference in film morphology. However, plasma exposure longer than 5 min leads to the removal of graphene flakes and degradation of graphene films, in turn, affecting the flake connectivity and increasing film resistance. We show that by changing the exposure time, we can control the work function and decrease sheet resistance, without affecting surface morphology. Controllability of the plasma technique has an advantage for graphene functionalization over conventional doping techniques such as chemical drop-casting. It allows for the controllable tuning of the work function, surface morphology, and sheet resistance of LBSA graphene films, which is substantial for applications in various optoelectronic devices.
PB  - MDPI
T2  - Condensed Matter
T1  - Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films
VL  - 8
IS  - 2
SP  - 34
DO  - 10.3390/condmat8020034
ER  - 

@article{
author = "Tomašević-Ilić, Tijana and Škoro, Nikola and Jovanović, Đorđe and Puač, Nevena and Spasenović, Marko",
year = "2023",
abstract = "Graphene films prepared from solution and deposited by Langmuir–Blodgett self-assembly technique (LBSA) were treated with radio-frequency (13.56 MHz) nitrogen plasma in order to investigate the influence of the time of nitrogen plasma exposure on the work function, sheet resistance, and surface morphology of LBSA graphene films. Kelvin probe force microscopy and sheet resistance measurements confirm nitrogen functionalization of our films, with the Fermi level shifting in a direction that indicates binding to a pyridinic and/or pyrrolic site. Upon 1 min of nitrogen plasma exposure, the sheet resistance decreases and there is no obvious difference in film morphology. However, plasma exposure longer than 5 min leads to the removal of graphene flakes and degradation of graphene films, in turn, affecting the flake connectivity and increasing film resistance. We show that by changing the exposure time, we can control the work function and decrease sheet resistance, without affecting surface morphology. Controllability of the plasma technique has an advantage for graphene functionalization over conventional doping techniques such as chemical drop-casting. It allows for the controllable tuning of the work function, surface morphology, and sheet resistance of LBSA graphene films, which is substantial for applications in various optoelectronic devices.",
publisher = "MDPI",
journal = "Condensed Matter",
title = "Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films",
volume = "8",
number = "2",
pages = "34",
doi = "10.3390/condmat8020034"
}

Tomašević-Ilić, T., Škoro, N., Jovanović, Đ., Puač, N.,& Spasenović, M.. (2023). Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films. in Condensed Matter
MDPI., 8(2), 34.
https://doi.org/10.3390/condmat8020034

Tomašević-Ilić T, Škoro N, Jovanović Đ, Puač N, Spasenović M. Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films. in Condensed Matter. 2023;8(2):34.
doi:10.3390/condmat8020034 .

Tomašević-Ilić, Tijana, Škoro, Nikola, Jovanović, Đorđe, Puač, Nevena, Spasenović, Marko, "Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films" in Condensed Matter, 8, no. 2 (2023):34,
https://doi.org/10.3390/condmat8020034 . .