Electrochemically tunable ultrafast optical response of graphene oxide

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Kurum U., Ekiz O. O., YAĞLIOĞLU H. G., ELMALI A., Urel M., Guner H., ...Daha Fazla

APPLIED PHYSICS LETTERS, cilt.98, sa.14, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 98 Sayı: 14
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1063/1.3573797
  • Dergi Adı: APPLIED PHYSICS LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Ankara Üniversitesi Adresli: Evet

Özet

We demonstrate reversible and irreversible changes in the ultrafast optical response of multilayer graphene oxide thin films upon electrical and optical stimulus. The reversible effects are due to electrochemical modification of graphene oxide, which allows tuning of the optical response by externally applied bias. Increasing the degree of reduction in graphene oxide causes excited state absorption to gradually switch to saturable absorption for shorter probe wavelengths. Spectral and temporal properties as well as the sign of the ultrafast response can be tuned either by changing the applied bias or exposing to high intensity femtosecond pulses. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3573797]