The Role of Cuprous Oxide Seeds in the One-Pot and Seeded Syntheses of Copper Nanowires

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 10; no. 9; pp. 1771 - 1778
• Main Authors: Ye, Shengrong, Rathmell, Aaron R., Ha, Yoon-Cheol, Wilson, Adria R., Wiley, Benjamin J.
• Format: Journal Article
• Language: English
• Published: Germany Blackwell Publishing Ltd 01-05-2014; Wiley Subscription Services, Inc
• Subjects: Aggregates; Copper; copper nanowires; COPPER OXIDE; Cu2O octahedra; CUPROUS OXIDE; Ethylenediamine; FABRICATION; MICROWIRE; Nanoparticles; Nanotechnology; Nanowires; OXIDES; PARTICLES; seeded growth; Seeds; solution-phase synthesis; Synthesis; transparent conductors; seeded growth; copper nanowires; solution-phase synthesis; transparent conductors; Cu2O octahedra
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201303005

This paper demonstrates that Cu2O nanoparticles form in the early stages of a solution‐phase synthesis of copper nanowires, and aggregate to form the seeds from which copper nanowires grow. Removal of ethylenediamine from the synthesis leads to the rapid formation of Cu2O octahedra. These octahedra are introduced as seeds in the same copper nanowire synthesis to improve the yield of copper nanowires from 12% to >55%, and to enable independent control over the length of the nanowires. Transparent conducting films are made from nanowires with different lengths to examine the effect of nanowire aspect ratio on the film performance.
Cu2O octahedra formation occurs when ethylenediamine is removed from a copper nanowire synthesis. These octahedra are introduced as seeds to the synthesis to improve the yield of copper nanowires from 12% to >55%, and to enable independent control over the lengths of the nanowires.