Interaction between Quantum Dots of CdTe and Reduced Graphene Oxide: Investigation through Cyclic Voltammetry and Spectroscopy

• Published in: Journal of physical chemistry. C Vol. 117; no. 40; pp. 20944 - 20950
• Main Authors: Markad, Ganesh B, Battu, Shateesh, Kapoor, Sudhir, Haram, Santosh K
• Format: Journal Article
• Language: English
• Published: Columbus, OH American Chemical Society 10-10-2013
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Electronics; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Materials science; Molecular electronics, nanoelectronics; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Physics; Quantum dots; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Specific materials; Fluorescence spectroscopy; Raman spectra; Electronic properties; Strong interactions; Quantum dots; X ray fluorescence; Strong coupling; XRD; Raman spectroscopy; Spectral line shift; Steady state; Time resolved spectra; Cyclic voltammetry; Quasiparticles; Time resolution; Energy gap; Ultraviolet radiation; Composite materials; Transmission electron microscopy; II-VI semiconductors; Graphene; Electron interaction; Nanostructured materials
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp406679s

Cyclic voltammetry has been used to investigate the interaction between reduced graphene oxide (r-GO) and CdTe quantum dots (Q-CdTe). For that, the composite of Q-CdTe with r-GO (r-GO-CdTe) was prepared by carrying out the reduction of graphene oxide and the synthesis of Q-CdTe simultaneously, in a single bath. r-GO-CdTe was characterized by UV–visible, steady state fluorescence, time-resolved fluorescence, X-ray diffraction (XRD), Raman, and transmission electron microscopy (TEM). Cyclic voltammetry was employed to determine the quasi-particle gap and band edge parameters of Q-CdTe and r-GO-CdTe. The blue shifts in the quasi-particle gap of r-GO-CdTe have been attributed to the strong interaction of graphene with CdTe. These interactions were further verified by time-resolved fluorescence and Raman spectroscopy which suggested strong electronic coupling between Q-dots and graphene.