Woo Jong Seok, Sin Dong Hun, Kim Haena, Jang Jeong In, Kim Ho Young, Lee Geon-Woong, Cho Kilwon, Park Soo-Young, Han Joong Tark
Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, Republic of Korea.
Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Hyojadong, Pohang, 790-784, Republic of Korea.
Nanoscale. 2016 Mar 28;8(12):6693-9. doi: 10.1039/c5nr08687f.
Atomically thin and two-dimensional graphene oxide (GO) is a very fascinating material because of its functional groups, high transparency, and solution processability. Here we show that highly oxidized GO (HOGO) nanosheets serve as an effective interfacial modifier of transparent conducting films with one-dimensional (1D) silver nanowires (AgNWs) and single-walled carbon nanotubes (SWCNTs). Optically transparent and small-sized GO nanosheets, with minimal sp(2) domains, were successfully fabricated by step-wise oxidation and exfoliation of graphite. We demonstrated that under-coated HOGO further decreases the sheet resistance of the SWCNT film top-coated with HOGO by increasing the contact area between the SWCNTs and HOGO nanosheets by generating hole carriers in the SWCNT as a result of charge transfer. Moreover, HOGO nanosheets with AgNWs contribute to the efficient thermal joining of AgNW networks on plastic substrates by limiting the thermal embedding of AgNWs into the plastic surface, resulting in efficient decrease of the sheet resistance. Furthermore, flexible organic photovoltaic cells with GO-modified AgNW anodes on a flexible substrate were successfully demonstrated.
原子级薄的二维氧化石墨烯（GO）因其官能团、高透明度和溶液可加工性而成为一种非常引人入胜的材料。在此我们表明，高度氧化的GO（HOGO）纳米片可作为具有一维（1D）银纳米线（AgNWs）和单壁碳纳米管（SWCNTs）的透明导电薄膜的有效界面改性剂。通过对石墨进行逐步氧化和剥离，成功制备出具有最小sp(2)域的光学透明且尺寸小的GO纳米片。我们证明，底涂HOGO通过电荷转移在SWCNT中产生空穴载流子，从而增加SWCNT与HOGO纳米片之间的接触面积，进一步降低顶涂HOGO的SWCNT薄膜的薄层电阻。此外，含有AgNWs的HOGO纳米片通过限制AgNWs热嵌入到塑料表面，有助于塑料基板上AgNW网络的高效热连接，从而有效降低薄层电阻。此外，还成功展示了在柔性基板上具有GO改性AgNW阳极的柔性有机光伏电池。
