Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Swift heavy-ion irradiation of graphene oxide: Localized reduction and formation of sp-hybridized carbon chains. / Olejniczak, Andrzej; Nebogatikova, Nadezhda A.; Frolov, Aleksei V. и др.
в: Carbon, Том 141, 01.01.2019, стр. 390-399.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Swift heavy-ion irradiation of graphene oxide: Localized reduction and formation of sp-hybridized carbon chains
AU - Olejniczak, Andrzej
AU - Nebogatikova, Nadezhda A.
AU - Frolov, Aleksei V.
AU - Kulik, Miroslaw
AU - Antonova, Irina V.
AU - Skuratov, Vladimir A.
N1 - Publisher Copyright: © 2018 Elsevier Ltd
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Herein, we report the fabrication of nanometer-sized reduced graphene oxide (rGO) spots by swift heavy-ion (SHI) bombardment. Such structures can be considered graphene quantum dots (QDs) embedded in a non-conducting matrix. Both the number density and the diameter of the rGO spots can be tailored by a suitable choice of irradiation parameters (i.e., ion type, fluence, and energy). The degree of graphene oxide defunctionalization by SHIs with different energies scaled well with the deposited electronic energy density. The resistance of the samples decreased nonlinearly with increasing ion dose and, at fluences above 1013 ions/cm2, was orders of magnitude lower than the initial value. An increase in the electronic stopping power of the ion resulted (i) in suppression of the structural ordering at low fluences and (ii) in increased amorphization efficiency and formation of sp-hybridized carbon chains of both polyynes and polycumulenes at high fluences. A hypothesis suggesting that the sp-C chains are bridges joining opposite sides of nanoholes created inside the track core and thus assuming the formation of a coupled QD-antidot system is presented. These phenomena were found to be absent in comparative experiments with 200 keV Xe ion irradiation, i.e., in the nuclear stopping regime.
AB - Herein, we report the fabrication of nanometer-sized reduced graphene oxide (rGO) spots by swift heavy-ion (SHI) bombardment. Such structures can be considered graphene quantum dots (QDs) embedded in a non-conducting matrix. Both the number density and the diameter of the rGO spots can be tailored by a suitable choice of irradiation parameters (i.e., ion type, fluence, and energy). The degree of graphene oxide defunctionalization by SHIs with different energies scaled well with the deposited electronic energy density. The resistance of the samples decreased nonlinearly with increasing ion dose and, at fluences above 1013 ions/cm2, was orders of magnitude lower than the initial value. An increase in the electronic stopping power of the ion resulted (i) in suppression of the structural ordering at low fluences and (ii) in increased amorphization efficiency and formation of sp-hybridized carbon chains of both polyynes and polycumulenes at high fluences. A hypothesis suggesting that the sp-C chains are bridges joining opposite sides of nanoholes created inside the track core and thus assuming the formation of a coupled QD-antidot system is presented. These phenomena were found to be absent in comparative experiments with 200 keV Xe ion irradiation, i.e., in the nuclear stopping regime.
KW - GAMMA-RAY IRRADIATION
KW - GRAPHITE-ELECTRODES
KW - RAMAN-SPECTRA
KW - ENERGY
KW - FILMS
KW - DEOXYGENATION
KW - PERFORMANCE
KW - STABILITY
KW - CHEMISTRY
KW - TRANSPORT
UR - http://www.scopus.com/inward/record.url?scp=85054340688&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2018.09.042
DO - 10.1016/j.carbon.2018.09.042
M3 - Article
AN - SCOPUS:85054340688
VL - 141
SP - 390
EP - 399
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -
ID: 17035883