title: Controlling the luminescence emission from palladium grafted graphene oxide thin films via reduction.
abstract: The role of palladium (Pd) in the reduction of graphene oxide (GO) thin films was investigated using a Pd assisted grafting technique. The structural and optical characteristics of these thin films were obtained from various spectroscopic analyses, which confirmed increased C[double bond, length as m-dash]C-C aromatic ring vibration and oxidation of Pd with Ar annealing. In Pd free GO, annealing of films resulted in restoration of sp(2) clusters; however, Pd grafting with non-annealed film enhanced the possibility of restoration and further annealing dramatically increased the restoration rate with enhanced blue photoluminescence (PL) emission. The blue PL emission originates from sp(2) cluster sites and the yellow-green PL from defect trapped states. As reduction of GO increased, yellow-green emission decreased and blue PL became the prominent emission. These experimental findings open up a new feasible pathway for controlling the luminescence emission from graphene oxide that furthers the technological advancement of graphene based optoelectronic devices.
authors.affiliation: NEMD Lab., Department of Mechanical Engineering, Yonsei University, Seoul 120 749, Republic of Korea.
authors.forename: J R
authors.initials: JR
authors.lastname: Rani
authors.forename: Juyeong
authors.initials: J
authors.lastname: Oh
authors.forename: Ji-Eun
authors.initials: JE
authors.lastname: Park
authors.forename: Juhwan
authors.initials: J
authors.lastname: Lim
authors.forename: Byeongho
authors.initials: B
authors.lastname: Park
authors.forename: Kyung
authors.initials: K
authors.lastname: Kim
authors.forename: Sung-Jin
authors.initials: SJ
authors.lastname: Kim
authors.forename: Seong
authors.initials: S
authors.lastname: Chan Jun
mesh_terms: D006108:Graphite / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D010165:Palladium / Q000737:chemistry*; D011789:Quantum Theory
chemical_list: D010087:Oxides; D010165:Palladium; D006108:Graphite; C048320:palladium oxide