Emerging photoluminescence from defective vanadium diselenide nanosheets

Amir Ghobadi; Turkan Gamze Ulusoy Ghobadi; Ali Kemal Okyay; Ekmel Ozbay

doi:doi:10.1364/PRJ.6.000244

Photonics Research, 2018, 6 (4): 04000244, Published Online: Aug. 1, 2018

Emerging photoluminescence from defective vanadium diselenide nanosheets Download： 921次

Amir Ghobadi ^1,2,5Turkan Gamze Ulusoy Ghobadi ³Ali Kemal Okyay ^2,3Ekmel Ozbay ^1,2,3,4,*

Author Affiliations

¹ NANOTAM-Nanotechnology Research Center, Bilkent University, 06800 Ankara, Turkey

² Department of Electrical and Electronics Engineering, Bilkent University, 06800 Ankara, Turkey

³ UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey

⁴ Department of Physics, Bilkent University, 06800 Ankara, Turkey

⁵ e-mail: amir@ee.bilkent.edu.tr

Figures & Tables

Fig. 1. Schematic representation of VSe2 NP and NS formation using the PLA and ultra-sonication-assisted chemical exfoliation.

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Fig. 2. TEM images showing the successful formation of (a) laser-ablated NPs and (b) chemically exfoliated NSs. (c) HRTEM image showing the lattice spacing in the synthesized NSs. (d) SEM image of the drop-casted NS solution. (e) AFM measurement results showing the formation of single to a few layers of VSe2 and its thickness profile.

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Fig. 3. XRD patterns of the VSe2 (a) rock, and produced (b) NP and (c) NS samples.

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Fig. 4. (a) Absorption spectra of the synthesized colloidal NPs and NSs. The inset estimates the optical band gap of the samples. (b) The transition from 1T phase to 2H phase in IR radiated VSe2 samples.

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Fig. 5. (a) Images of the NP and NS solutions before and after excitation with UV-incident light and (b) their PL spectra upon excitation with a 300 nm light. (c) The change of the emission spectra of the NS sample under different excitation wavelengths. (d) PL spectra change after irradiation with continuous light for 4 h. (e) The dependence of PL on the excitation light intensity at an excitation wavelength of 330 nm with different slit width values.

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Fig. 6. Raman spectra of the VSe2 rock and prepared NS samples.

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Fig. 7. V 2p-O 1s and Se 3d spectra of the VSe2 (a),(d) rock, and the prepared (b),(e) NP and (c),(f) NS samples. All spectra have been deconvoluted to multiple peaks.

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Amir Ghobadi, Turkan Gamze Ulusoy Ghobadi, Ali Kemal Okyay, Ekmel Ozbay. Emerging photoluminescence from defective vanadium diselenide nanosheets[J]. Photonics Research, 2018, 6(4): 04000244.

Emerging photoluminescence from defective vanadium diselenide nanosheets Download： 921次

Fig. 1. Schematic representation of VSe2 NP and NS formation using the PLA and ultra-sonication-assisted chemical exfoliation.

Fig. 3. XRD patterns of the VSe2 (a) rock, and produced (b) NP and (c) NS samples.

Fig. 4. (a) Absorption spectra of the synthesized colloidal NPs and NSs. The inset estimates the optical band gap of the samples. (b) The transition from 1T phase to 2H phase in IR radiated VSe2 samples.

Fig. 6. Raman spectra of the VSe2 rock and prepared NS samples.

Fig. 7. V 2p-O 1s and Se 3d spectra of the VSe2 (a),(d) rock, and the prepared (b),(e) NP and (c),(f) NS samples. All spectra have been deconvoluted to multiple peaks.

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Emerging photoluminescence from defective vanadium diselenide nanosheets Download： 921次

Fig. 1. Schematic representation of VSe2 NP and NS formation using the PLA and ultra-sonication-assisted chemical exfoliation.

Fig. 3. XRD patterns of the VSe2 (a) rock, and produced (b) NP and (c) NS samples.

Fig. 4. (a) Absorption spectra of the synthesized colloidal NPs and NSs. The inset estimates the optical band gap of the samples. (b) The transition from 1T phase to 2H phase in IR radiated VSe2 samples.

Fig. 6. Raman spectra of the VSe2 rock and prepared NS samples.

Fig. 7. V 2p-O 1s and Se 3d spectra of the VSe2 (a),(d) rock, and the prepared (b),(e) NP and (c),(f) NS samples. All spectra have been deconvoluted to multiple peaks.

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