Advances in flexible optoelectronic devices have led to increasing need for developing high performance, low cost, and flexible transparent conducting electrodes. Copper-based electrodes have been unattainable due to the relatively thermal instability and poor oxidation resistance. Herein, we present oxidation resistive CuNi nanomesh electrodes that exhibit a low sheet resistance of similar to 7.5 Omega/rectangle and a high optical transmittance of similar to 81% at 550 nm. Further, high long-term stability against the effects of oxidation, heat, and chemicals is exhibited by the CuNi nanomesh, in comparison with the behavior of a pure Cu nanomesh sample. (C) 2016 Elsevier B.V. All rights reserved.