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Reversibly light-modulated dirac point of graphene functionalized with spiropyran.
ACS Nano. 2012 Oct 23; 6(10):9207-13.AN

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.

Authors+Show Affiliations

Interdisciplinary School of Green Energy, Low Dimensional Carbon Materials Center, KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science & Technology (UNIST), UNIST-gil 50, Ulsan 689-805, Korea.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22980316

Citation

Jang, A-Rang, et al. "Reversibly Light-modulated Dirac Point of Graphene Functionalized With Spiropyran." ACS Nano, vol. 6, no. 10, 2012, pp. 9207-13.
Jang AR, Jeon EK, Kang D, et al. Reversibly light-modulated dirac point of graphene functionalized with spiropyran. ACS Nano. 2012;6(10):9207-13.
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), 9207-13. https://doi.org/10.1021/nn303539y
Jang AR, et al. Reversibly Light-modulated Dirac Point of Graphene Functionalized With Spiropyran. ACS Nano. 2012 Oct 23;6(10):9207-13. PubMed PMID: 22980316.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reversibly light-modulated dirac point of graphene functionalized with spiropyran. AU - Jang,A-Rang, AU - Jeon,Eun Kyung, AU - Kang,Dongwoo, AU - Kim,Gwangwoo, AU - Kim,Byeong-Su, AU - Kang,Dae Joon, AU - Shin,Hyeon Suk, Y1 - 2012/09/20/ PY - 2012/9/18/entrez PY - 2012/9/18/pubmed PY - 2013/3/23/medline SP - 9207 EP - 13 JF - ACS nano JO - ACS Nano VL - 6 IS - 10 N2 - 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. SN - 1936-086X UR - https://www.unboundmedicine.com/medline/citation/22980316/Reversibly_light_modulated_dirac_point_of_graphene_functionalized_with_spiropyran_ L2 - https://doi.org/10.1021/nn303539y DB - PRIME DP - Unbound Medicine ER -