Abstract
We prepared transparent conducting composite electrodes composed of silver nanowires (Ag NWs) and reduced graphene oxide (r-GO). We present a simple approach to welding the cross-positions of the Ag NWs by applying pressure at a relatively low temperature (100°C). We examined the Ag NWs/r-GO composite films in terms of their transmission, conductivity, and stability. The plasmonic features of the Ag NWs were used to assist the ultraviolet (UV) light-induced reduction of the GO coating. The r-GO coatings used to form Ag NWs/r-GO composite structures increased the conductivity of the film by providing more efficient electron conductive pathways. The G/D intensity ratios of the GO and r-GO produced by the UV light-induced method without and with Ag NWs were 0.95, 1.01, and 1.04, respectively. The lowest sheet resistance of the composite films was 7 ohm/sq with approximately 82% transparency in the visible spectrum region. No degradation of the films was observed after 2 months. This excellent environmental stability might facilitate applications of Ag NWs/r-GO composite films in optoelectronic devices.
Highlights
Transparent conductive films (TCFs) have become the electrode of choice for many optoelectronic devices in recent years, including transparent displays, organic light-emitting diodes, touch-panel screens, and solar cells [1,2,3]
The Ag NW networks in the composite electrode can promote electron collection and injection in regions farther from the metal probe because the Ag NWs can act as a broad-range collector and injector due to their length, which will improve the efficiency of optoelectronic devices [20]
The optical properties of Ag NW networks were determined by measuring their transmittance spectra
Summary
Transparent conductive films (TCFs) have become the electrode of choice for many optoelectronic devices in recent years, including transparent displays, organic light-emitting diodes, touch-panel screens, and solar cells [1,2,3]. For these purposes, TCFs have been widely developed. To overcome the shortcomings of ITO, currently considered alternative material systems for TCFs include onedimensional (1D) random networks of metallic nanowires [9,10,11,12], carbon nanotubes [3, 13, 14], and 2D graphene films [15,16,17]. There are still several problems associated with high contact resistance caused by loose contact among NW-NW, poor adhesion to substrates, and instability in the harsh environments that must be addressed before practical applications of Ag NW networks [21,22,23,24]
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