A study on chemical exfoliation and structural and optical properties of two-dimensional layered titanium diselenide

Ashish Kumar, Rohit Sharma, Sandeep Yadav, Sanjay Kumar Swami, Reena Kumari, V. N. Singh, S. Ojha, Joerg J. Schneider, Ritu Srivastava, O. P. Sinha

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Titanium diselenide (TiSe2) is the least studied member of the transition metal dichalcogenide family due to a lack of available synthesis methodology, controlled bandgap engineering, and rapid characterization of layers. In this paper, we report the chemical exfoliation of TiSe2platelets synthesized by the chemical vapor transport route inortho-dichlorobenzene (o-DCB) functionalized with oleylamine (OLA), for the first time to the best of our knowledge. It is found that the addition of OLA supports the formation of a stable dispersion of a large area of the TiSe2sheets due to surface capping with the OLA molecules indicating the importance of the ligand in dispersion behavior. The X-ray diffraction pattern confirms the hexagonal structure of the TiSe2platelets with the space groupP3̄m1 while Raman spectroscopy reveals that two modes of vibrationi.e.A1gand E2gexist with layered structures having dimensions in micrometers as confirmed by scanning electron microscopy. Fourier transform infrared spectroscopy confirms the successful functionalization of chemically exfoliated TiSe2nanosheets. Field-emission scanning electron microscopy reveals that exfoliated TiSe2has a thickness of 15-55 nm whereas high-resolution transmission electron microscopy indicates thicker sheets for ligand-free exfoliated TiSe2which are crystalline. Atomic force microscopy confirms the formation of nanosheets. UV-Visible, photoluminescence, and time-resolved PL spectroscopy showed an enhanced effect and better average lifetime of excitation for the exfoliated sheets with OLA than those without OLA. The C-V studies reveal that with increasing scan rate, the corresponding current also increases. The present study offers the possibility of their utilization in optoelectronics, advanced low-power electronics, voltage-controlled oscillators, ultra-fast electronics, and electrochemical devices.

Original languageEnglish
Pages (from-to)3894-3903
Number of pages10
JournalDalton Transactions
Issue number11
StatePublished - 21 Mar 2021
Externally publishedYes

ASJC Scopus subject areas

  • Inorganic Chemistry


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