Silver Nanorings: New Generation of Transparent Conductive Films

• Published in: Chemistry : a European journal 2018-12, Vol.24 (72), p.19195-19199
• Main Authors: Azani, Mohammad‐Reza, Hassanpour, Azin
• Format: Article
• Language: English
• Subjects: Ammonium; Ammonium salts; Aspect ratio; Chemistry; conductive films; Electrical properties; Ethanol; Haze; metal nanorings; Nanotechnology; Nanowires; Optoelectronics; Reproducibility; Salts; solvothermal method; spray coating; Substrates; tetrapropylammonium salts; Transparency
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.201804788

Low‐cost and high yield silver nanorings with the uniform ring diameter of 15±5 μm and thickness of 120±20 nm were synthesized via a simple solvothermal method. Based on our knowledge, this is the first time that a solvothermal method is used to prepare silver nanorings. Herein, by using ammonium salts as additive salts in the presence of pressure (150 kPa) inside the reactor, the reproducibility and yield of nanorings increased. The prepared silver nanorings easily dispersed in ethanol and have been coated by spray method on PET substrate to make flexible transparent conductive films (TCF). The film based on nanorings was shown better opto‐electrical properties (higher transparency with lower haze) in comparison with nanowires with higher aspect ratio and lower thickness, at the same sheet resistance (Rs). These results introduce silver nanorings as outstanding candidates for optoelectronics applications. Put a ring on it: Silver nanorings with high purity in high yield with uniform diameter and thickness were synthesized through facile solvothermal method. The conductive ink based on silver nanorings was successfully prepared and coated on PET substrate. The opto‐electrical properties of TCF with nanorings were improved in comparison with TCF with nanowires at the same sheet resistance (see figure).