2D materials are 1-atom thick, sheet like structures such as graphene, graphdiyne and pyrediyne which have been identified as promising candidates for fabricating next generation electronic and optoelectronic devices.1-3 In the present work, a novel 2D nanosheet was designed and synthesized using two different polycyclic aromatic compounds viz coronene and pyrene (COPY) (Figure 1 a).4 Further investigations pointed out that incorporating COPY to substrates
such as cotton fabric and melamine sponge led to the formation of hydrophobic and superhydrophobic surfaces with contact angles of 137.7˚ and 154.4˚, respectively. Moreover, COPY incorporated cotton fabric was shown to be an effective filter for oil from water with an efficiency of 95.5 %. The nanosheet also exhibited an electrical conductivity of 1.16 × 10−3 Sm−1 which is one order of magnitude higher than that of the reported value for graphdiyne. Next, a brand
new 1D nanorod was synthesized from an anthracene precursor via Glaser Hay coupling, and it was observed that the material exhibited crystalline nature, significant photoluminescence, thermal stability and electrical conductivity (9.9 ×10-2 Sm-1) (figure 1b). The investigation was further extended to prepare a novel 0D carbon-based material from the 2D nanosheet of pyrediyne through acid treatment, followed by Soxhlet extraction.5 The bright luminescent 0D material (emm. = 23%) was named as pyrediyne quantum dot (PDYQD) and found to be useful for bioimaging (MCF7 breast
cancer cells) (Figure 1c). The emission quantum yield of PDYQD was increased upon surface modification using PEG (emm. = 25.5%) and amine (emm. = 30%), presumably due to the decreased number of non-radiative electron-hole recombination centres. The seminar will present the details of the investigation involved in the design, synthesis and property evaluation of these novel nanostructures.
References
[1] S. Bharech, R. Kumar, J. Mater. Sci. Mech. Eng. 2015, 2, 70.
[2] G. Li, Y. Li, H. Liu, Y. Guo, Y. Li, D. Zhu, Chem. Commun. 2010, 46, 3258.
[3] P. Prabakaran, S. Satapathy, E. Prasad, S. Sankararaman, J. Mater.Chem. C 2018, 6, 380.
[4] J.S. Arya, M.K. Mahato, S. Sankararaman, E. Prasad, J. Mater. Chem. C 2021, 9, 10333.
[5] J.S. Arya , P. Prabakaran, R. Kannan, E. Prasad, S. Sankararaman, Adv. Mater. Interfaces. 2020, 7, 1902209.