Reversibly light-modulated Dirac point of graphene functionalized with spiropyran

A. Rang Jang, Eun Kyung Jeon, Dongwoo Kang, Gwangwoo Kim, Byeong-Su Kim, Dae Joon Kang, Hyeon Suk Shin

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Graphene has been functionalized with spiropyran (SP), a well-known photochromic molecule. It has been realized with pyrene-modified SP, which has been adsorbed on graphene by π-π interaction between pyrene and graphene. The field-effect transistor (FET) with SP-functionalized graphene exhibited n-doping effect and interesting optoelectronic behaviors. The Dirac point of graphene in the FET could be controlled by light modulation because spiropyran can be reversibly switched between two different conformations, a neutral form (colorless SP) and a charge-separated form (purple colored merocyanine, MC), on UV and visible light irradiation. The MC form is produced during UV light irradiation, inducing the shift of the Dirac point of graphene toward negative gate voltage. The reverse process back to the neutral SP form occurred under visible light irradiation or in darkness, inducing a shift of the Dirac point toward positive gate voltage. The change of the Dirac point by UV and visible light was reproducibly repeated. SP molecules also improved the conductance change in the FET device. Furthermore, dynamics on conversion from MC to SP on graphene was different from that in solution and solid samples with SP-grafted polymer or that on gold nanoparticles.

Original languageEnglish
Pages (from-to)9207-9213
Number of pages7
JournalACS Nano
Volume6
Issue number10
DOIs
Publication statusPublished - 2012 Oct 23

Fingerprint

Graphite
Graphene
graphene
Field effect transistors
field effect transistors
Pyrene
Irradiation
pyrenes
irradiation
darkness
Molecules
Light modulation
light modulation
shift
Electric potential
electric potential
spiropyran
Ultraviolet radiation
Optoelectronic devices
Conformations

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Jang, A. R., Jeon, E. K., Kang, D., Kim, G., Kim, B-S., Kang, D. J., & Shin, H. S. (2012). Reversibly light-modulated Dirac point of graphene functionalized with spiropyran. ACS Nano, 6(10), 9207-9213. https://doi.org/10.1021/nn303539y
Jang, A. Rang ; Jeon, Eun Kyung ; Kang, Dongwoo ; Kim, Gwangwoo ; Kim, Byeong-Su ; Kang, Dae Joon ; Shin, Hyeon Suk. / Reversibly light-modulated Dirac point of graphene functionalized with spiropyran. In: ACS Nano. 2012 ; Vol. 6, No. 10. pp. 9207-9213.
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Jang, AR, Jeon, EK, Kang, D, Kim, G, Kim, B-S, Kang, DJ & Shin, HS 2012, 'Reversibly light-modulated Dirac point of graphene functionalized with spiropyran', ACS Nano, vol. 6, no. 10, pp. 9207-9213. https://doi.org/10.1021/nn303539y

Reversibly light-modulated Dirac point of graphene functionalized with spiropyran. / Jang, A. Rang; Jeon, Eun Kyung; Kang, Dongwoo; Kim, Gwangwoo; Kim, Byeong-Su; Kang, Dae Joon; Shin, Hyeon Suk.

In: ACS Nano, Vol. 6, No. 10, 23.10.2012, p. 9207-9213.

Research output: Contribution to journalArticle

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AU - Shin, Hyeon Suk

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AB - Graphene has been functionalized with spiropyran (SP), a well-known photochromic molecule. It has been realized with pyrene-modified SP, which has been adsorbed on graphene by π-π interaction between pyrene and graphene. The field-effect transistor (FET) with SP-functionalized graphene exhibited n-doping effect and interesting optoelectronic behaviors. The Dirac point of graphene in the FET could be controlled by light modulation because spiropyran can be reversibly switched between two different conformations, a neutral form (colorless SP) and a charge-separated form (purple colored merocyanine, MC), on UV and visible light irradiation. The MC form is produced during UV light irradiation, inducing the shift of the Dirac point of graphene toward negative gate voltage. The reverse process back to the neutral SP form occurred under visible light irradiation or in darkness, inducing a shift of the Dirac point toward positive gate voltage. The change of the Dirac point by UV and visible light was reproducibly repeated. SP molecules also improved the conductance change in the FET device. Furthermore, dynamics on conversion from MC to SP on graphene was different from that in solution and solid samples with SP-grafted polymer or that on gold nanoparticles.

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