Effects of graphene oxide and reduced graphene oxide on the energy storage capacity of a short-chain dyad. A comparative study with the pristine dyad

• Published in: Journal of molecular structure Vol. 1274; p. 134548
• Main Authors: Paul, Somnath, Mondal, Soumi, Mitra, Ishani, Halder, Debmalya, Das, Subrata, Saha, Mithu, Chakraborty, Madhurima, Chakrabarti, Pabitra K, Show, Bibhuti Bhushan, Ganguly, Tapan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.02.2023
• Subjects: Charge recombination; Charge-separated yield; Graphene oxide; Light energy converter; Photoswitchable dyad; Reduced graphene oxide; Time resolved spectroscopy; Trans-conformer; Light energy converter; Time resolved spectroscopy; Photoswitchable dyad; Trans-conformer; Charge recombination; Charge-separated yield; Graphene oxide; Reduced graphene oxide
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2022.134548

•Femtosecond transient absorption measurements demonstrate first time that graphene nanocomposite dyad could develop stable light energy converters.•Fluorescence lifetime measurements reveal that with dyad-GO and dyad-RGO 20% trans structure of the ground state dyad could be protected on photoexcitation.•The trans-conformer in the excited state in case of the nanocomposite system of dyad may arise from the surface trap effect.•The transient absorption decay measurements demonstrate much slower energy wasting charge recombination rate processes when the dyad combines with graphenes.•The dyad-GO (or RGO) appears to be better light energy converter than the pristine dyad. Steady state and time resolved spectroscopic investigations on a pristine short-chain dyad (E)-(((9H-fluorene-2-yl)imino)methyl)-N,Ndimethylaniline (NNDMBF) and its nanocomposite forms with Graphene oxide (GO) as well as reduced Graphene oxide (RGO) were made in order to develop efficient light energy converters. To the best of our knowledge, it appears to be the first time when by using the techniques of fluorescence lifetimes along with femtosecond transient absorption spectroscopic measurements it has been demonstrated that graphene nanocomposite dyads could form much larger charge-separated yield (φR∼ 0.28) coupled with slower energy wasting charge recombination rate processes (kCR ∼ 109s−1) relative to the pristine dyad (φR ∼ 0.02, kCR ∼ 1011s−1). This shows GO (and also RGO) plays significant role in designing stable light energy converter as well as light or energy storage devices when combined with the pristine dyad. [Display omitted]