@article{ea7e9c9b3b404a2b9eb19eacb86bc86f,
title = "A study on chemical exfoliation and structural and optical properties of two-dimensional layered titanium diselenide",
abstract = "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 groupP{\=3}m1 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.",
author = "Ashish Kumar and Rohit Sharma and Sandeep Yadav and Swami, {Sanjay Kumar} and Reena Kumari and Singh, {V. N.} and S. Ojha and Schneider, {Joerg J.} and Ritu Srivastava and Sinha, {O. P.}",
note = "Funding Information: The authors from the CSIR-NPL (RS, RK, and VN) are grateful to the director of the CSIR-NPL for his continuous encouragement and support. One of the authors, Ashish Kumar, acknowledges the CSIR for the grant of SRF. Dr Sanjay Kumar Swami thanks the Department of Science and Technology (DST), New Delhi for the Inspire Faculty Award. The authors from the Amity Institute of Nanotechnology (OPS and RS) acknowledge the financial support received from DRDO-SSPL, New Delhi under Project CAR-1115/ CARS-64/TS/SPL/18. We thank Dr Tristan Clemons, UWA, Australia, for fruitful discussion and support for this work. Also, the authors are thankful to the IUAC for extending the FESEM facilities, funded by the MoES under the Geochronology project. The authors are also thankful to Dr Anit Dawar, IUAC, New Delhi, and Ms. Swati Chaudhary, AINT, AUUP, Noida for their help and support during FESEM and C–V studies. Dr Y. K. Mishra, Mads Clausen Institute, the University of Southern Denmark is acknowledged for fruitful suggestions. Funding Information: The authors from the CSIR-NPL (RS, RK, and VN) are grateful to the director of the CSIR-NPL for his continuous encouragement and support. One of the authors, Ashish Kumar, acknowledges the CSIR for the grant of SRF. Dr Sanjay Kumar Swami thanks the Department of Science and Technology (DST), New Delhi for the Inspire Faculty Award. The authors from the Amity Institute of Nanotechnology (OPS and RS) acknowledge the financial support received from DRDO-SSPL, New Delhi under Project CAR-1115/CARS-64/TS/SPL/18. We thank Dr Tristan Clemons, UWA, Australia, for fruitful discussion and support for this work. Also, the authors are thankful to the IUAC for extending the FESEM facilities, funded by the MoES under the Geochronology project. The authors are also thankful to Dr Anit Dawar, IUAC, New Delhi, and Ms. Swati Chaudhary, AINT, AUUP, Noida for their help and support during FESEM and C-V studies. Dr Y. K. Mishra, Mads Clausen Institute, the University of Southern Denmark is acknowledged for fruitful suggestions. Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2021.",
year = "2021",
month = mar,
day = "21",
doi = "10.1039/d0dt03689g",
language = "English",
volume = "50",
pages = "3894--3903",
journal = "Dalton Transactions",
issn = "1477-9226",
publisher = "Royal Society of Chemistry",
number = "11",
}