Recently, Ye Changhui, a researcher at the Institute of Micronanotechnology and Devices of the Institute of Solid State Physics, Chinese Academy of Sciences, made a series of advances in the research of high-quality silver nanowire transparent conducting films. The relevant results were published in ACS Appl. Mater. Interfaces, respectively. J. Mater. Chem. C (this article was selected as the cover paper of J. Mater. Chem. C magazine and 2017 hot paper), CrystEngComm, and applied for two national invention patents.
Silver nanowire transparent conductive film has excellent conductivity, visible light permeability and flexibility, and has become a strong competitor of traditional transparent conductive film material indium tin oxide (ITO), and is expected to gradually replace ITO material in flexible electronic devices. However, the bottleneck of the practical application of the silver nanowire transparent conductive film is not the poor conductivity and low visible light transmittance, but the poor uniformity and haze of the sheet resistance. The key to solving these two problems lies in whether or not Excellent and stable coating solution. At present, the research in related fields in the world mainly focuses on improving the conductivity of the film and the visible light transmittance. However, there is not much concern about the uniformity of the film sheet resistance and the problem of excessive haze, especially for coating liquid properties. The research reports are very few, which seriously restricts the large-scale application of silver nanowires in mainstream electronic products.
Ye Changhui team conducted in-depth research on two issues of poor uniformity of the sheet resistance and haze, and made a series of progress. The researchers first proposed a new method for suppressing secondary nucleation and obtained silver nanowires with ultra-fine (<20 nm in diameter) and ultra-large aspect ratio (L/D>1500) containing less particles (CrystEngComm. 2017, 19 , 148-153); Further, through the colloidal stability theory, a size screening method was designed to obtain silver nanowires with narrow size distribution and high purity (J. Mater. Chem. C 2017, 5, 2240-2246); Surface chemical modification of the silver nanowires resulted in a high concentration (5mg/ml) silver nanowire coating solution that can be stably distributed in the solvent (can be stored for more than half a year) for a long period of time (RSC Adv. 2017, 7, 1926- (1942); By analyzing the mass transfer and heat transfer processes in film coating, a dynamic infrared heating method was proposed. Finally, a uniform sheet resistance (less than 5% resistance non-uniformity) and a low haze (haze less than 0.8%) were obtained. A high-quality silver nanowire transparent conductive film (visible light transmittance >91%, sheet resistance <75Ω/□) (ACS Appl. Mater. Interfaces 2016, 8, 9865-9871). The above research results provide new ideas for obtaining silver nanowire transparent conductive films, and lay a good research foundation for the practical application of flexible electronic devices.
The above research has been funded by the National Natural Science Foundation and corporate cooperative R&D projects.
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