Reduction of Graphene Oxide and its Effect on Square Resistance of Reduced Graphene Oxide Films

Abstract

Graphite oxide was prepared via the modified Hummers' method and graphene via chemical reduction. Deoxygenation efficiency of graphene oxide was compared among single reductants including sodium borohydride, hydrohalic acids, hydrazine hydrate, and vitamin C. Two-step reduction of graphene oxide was primarily studied. The reduced graphene oxide was characterized by XRD, TG, SEM, XPS, and Raman spectroscopy. Square resistance was measured as well. Results showed that films with single-step N 2 H 4 reduction have the best transmittance and electrical conductivity with square resistance of~5746 Ω/sq at 70% transmittance. This provided an experimental basis of using graphene for electronic device applications.

Effect of pH on the Reduction of Graphene Oxide on its Structure and Oxygen Reduction Capabilities in the Alkaline Media

“…In many of the studies involving the hydrothermal reduction of GO, the pH of the solution is usually adjusted to around 9–10 before adding the reducing agent . This is also the case with many metal salts impregnated onto supports with sodium borohydride .…”

Low-temperature vapor reduction of graphene oxide electrodes for vertical organic field-effect transistors

“…S5 (ESI †), the C1s XPS spectrum of the GO film can be divided into three peaks at around 288.1, 286.5, and 284.2 eV, arising from the CQO, C-O, and C-C bonds, respectively. 25,26 The CQO and C-O bonds account for oxygen-containing groups in the GO film. After reduction treatment, the intensities of the corresponding CQO and C-O peaks dramatically decrease, while the C-C peak becomes the dominant peak.…”

“…[20][21][22][23] In this regard, chemical reduction is preferred because of its low reduction temperature. [24][25][26][27][28] In particular, chemical reduction by the vapor phase is more promising because dipping the substrate with the GO film in a hot reducing solution would inevitably ruin and even peel off the rGO film from the substrate, 20,29 which would greatly degrade the device performance. The rGO films prepared by vapor phase reduction, such as with hydrazine vapor, normally suffer from poor electrical conductivity, and further thermal reduction treatment (4300 1C) is usually required to improve their electrical properties.…”

The processing and analysis of graphene and the strength enhancement effect of graphene-based filler materials: A review

“…Chemical method is also an option for the reduction of graphene oxide. The most commonly applied chemical reduction regents are hydrazine [35][36][37][38][39][40][41][42][43], sodium J o u r n a l P r e -p r o o f -10-borohydride [44][45][46] and hydrohalic acid [47,48]. Other materials such as sodium ascorbate [49], L-ascorbic acid [50,51], sodium-citrate [52] can be used as well.…”