Abstract
The photochemical-reduction methods exhibit many interesting applications in metal and metal oxide nanoparticles with promising properties such as easy-to-handle, easy-to-inkjet and cost-effective. Using the soluble graphene oxide (GO) as a precursor, graphene production can be achieved via photochemical reduction, paving the way for manufacturing graphene products in controllable microscopic patterns. In this work, I used a photochemical method to obtain reduced graphene oxide (rGO), assisted by strong reducing $\alpha $ -aminoalkyl ( $\alpha $ -A*) radicals generated by photoinitiator Irgacure-907. The extent of oxygen reduction can be continually controlled by manipulating light dosage and characterized by quantitative measurements of structure, morphology, chemical composition and electrical conductivity. The high quality of obtained rGO makes this photochemical-reduction based technology ideal for inkjet printing microstructures of graphene, thus achieving desirable conductivity, other physical and chemical properties associated.
Highlights
Graphene is a one-atom-thick two-dimensional (2-D) sheet consisting of sp2-hybridized carbon atoms arranged in a honeycomb-like lattice
atomic force microscopy (AFM) was performed on the single-layer graphene oxide (GO) sheet by exfoliation (Fig. 3a), which read approximate 1.2 nm in typical vertical thickness, consistent with the data reported in the literature [32]
From the 3D AFM images of mica-immobilized single-layer GO sheet and photochemically reduced GO (Fig. 4), it can be found that the thickness of photochemically reduced GO sheet was much less than the original sample
Summary
Graphene is a one-atom-thick two-dimensional (2-D) sheet consisting of sp2-hybridized carbon atoms arranged in a honeycomb-like lattice. Graphene is often obtained through three pathways, micromechanical exfoliation [16], chemical vapor deposition (CVD) [17] and chemical reduction of GO [18]. The most widely used method is chemical reduction because it allows for mass production [19]. The chemical reduction relies on highly active but hazardous reductants, like hydrazine and hydrazine derivatives [20] or sodium borohydride [21] which may produce undesirable byproducts. The chemical reduction is effective and is realized in the laboratory, industrial manufacturers would not be satisfied with the toxic reduction processes applied in chemical reduction. Inkjet printing provided an alternative way of making high-quality graphene and corresponding nanomaterials with minimal toxic reagents and by-products
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