Reduced Graphene Oxide Thin Films with Very Large Charge Carrier Mobility Using Pulsed Laser Deposition

Abstract

Large area reduced graphene oxide (RGO) thin films have been grown using pulsed laser deposition (PLD) technique. A very large carrier mobility of 372 cm 2 V -1 s -1 has been observed in a PLD grown RGO thin film with a large sp 2 carbon fraction of 87% along with narrow Raman 2D peak profile. The fraction of sp 2 carbon and carbon/oxygen ratios are tuned through PLD growth parameters, and these are estimated from X-ray photoelectron spectroscopy (XPS) data. The electrical properties of the RGO thin films are comprehended by the intensity ratios between different optical phonon vibrational modes of Raman Spectra. The photoluminescence spectra also indicate a less intense and broader blue fluorescence spectrum detecting the presence of miniature sized sp 2 domains in the near vicinity of π* electronic states which favor the variable range hopping transport phenomena. This study on large area RGO thin films with very large carrier mobility fabricated by PLD process will be very useful for high mobility electronic device applications and could open a roadmap for further extensive research in functionalized 2D materials.

Deciphering Z-scheme Charge Transfer Dynamics in Heterostructure NiFe-LDH/N-rGO/g-C3N4 Nanocomposite for Photocatalytic Pollutant Removal and Water Splitting Reactions

“…The green emission band at ~560 nm corresponded to the presence of defects site of oxygen vacancy in CNNG3LDH 29,30 . The new peak in the PL spectra of CNNG7LDH sample at around 410 nm is due to the characteristic spectrum for exfoliated graphene sheet 56 . Due to higher wt% loading of rGO in CNNG7LDH than other samples of the series, the peak is more prominent in CNNG7LDH.The PL peak intensity of green emission band at 568 nm was more intense in heterostructure CNNGxLDH, implying that the energy level of the surface trap oxygen vacancies sites varied due to the transformation of pristine NiFe LDH to NiFe LDH nanosheets 55 .…”

Effects of nanoparticle-enhanced phase change material (NPCM) on solar still productivity

“…The XRD showed that TiO 2 and CuO were crystalline whereas GO was amorphous. Many studies have also shown that GO is amorphous (Bhaumik et al, 2017;Kumar, 2015; ACCEPTED MANUSCRIPT Mkhoyan et al, 2009;Shi et al, 2012) and semi-amorphous in nature (Malik et al, 2010;Pei and Cheng, 2011). This amorphous nature of GO is due to the warp from sp 3 C-O (Mkhoyan et al, 2009;Viet et al, 2010).…”

Nitrogen-doped graphenic foam synthesized by solvothermal-based process: Effect of pyrolysis temperature on the material properties

“…Other contributions need to be added to achieve a proper deconvolution. Two broad bands at 1160 cm -1 and 1490 cm -1 , named bands T and F respectively [54][55][56], can also appear in the presence of sp 3 carbon atoms, i.e. amorphous carbon, aliphatic fraction or defects in the graphenic network.…”