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Journal Article
Improved Optical Sintering Efficiency at the Contacts of Silver Nanowires Encapsulated by a Graphene Layer
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- Authors
- Seung-Bok Yang, HongKyw Choi, Da Som Lee, Choon-Gi Choi, Sung-Yool Choi, Il-Doo Kim
- Issue Date
- 2015-03
- Citation
- Small, v.11, no.11, pp.1293-1300
- ISSN
- 1613-6810
- Publisher
- Wiley-Blackwell
- Language
- English
- Type
- Journal Article
- Abstract
- Graphene/silver nanowire (AgNWs) stacked electrodes, i.e., graphene/AgNWs, are fabricated on a glass substrate by air-spray coating of AgNWs followed by subsequent encapsulation via a wet transfer of single-layer graphene (SLG) and multilayer graphene (MLG, reference specimen) sheets. Here, graphene is introduced to improve the optical sintering efficiency of a xenon flash lamp by controlling optical transparency and light absorbing yield in stacked graphene/AgNW electrodes, facilitating the fusion at contacts of AgNWs. Intense pulsed light (IPL) sintering induced ultrafast (<20 ms) welding of AgNW junctions encapsulated by graphene, resulting in approximately a four-fold reduction in the sheet resistance of IPL-treated graphene/AgNWs compared to that of IPL-treated AgNWs. The role of graphene in IPL-treated graphene/AgNWs is further investigated as a passivation layer against thermal oxidation and sulfurization. This work demonstrates that optical sintering is an efficient way to provide fast welding of Ag wire-to-wire junctions in stacked electrodes of graphene/AgNWs, leading to enhanced conductivity as well as superior long-term stability under oxygen and sulfur atmospheres. Optical sintering with intense pulsed light (IPL) offers an effective welding method for silver nanowire (AgNW) junctions. Graphene overlayers coated on AgNWs facilitate the heat transfer from graphene to AgNWs by effectively absorbing IPL energy, resulting in improved sintering efficiency at the contact between Ag wires.
- KSP Keywords
- Ag wire, Enhanced conductivity, Glass substrate, Graphene layers, Heat transfer, Silver nanowires(AgNWs), Spray coating, Thermal oxidation, Welding method, Xenon flash lamp, intense pulsed light