Research Update: Synthesis of sub-15-nm diameter silver nanowires through a water-based hydrothermal method: Fabrication of low-haze 2D conductive films

Hae-Won Jang,Yoon-Mi Kim,Yong-Hoe Kim,Ki-Wook Lee,Jin-Yeol Kim

doi:10.1063/1.4985764

Abstract

We synthesized ultra-thin Ag nanowire (Ag NWs) with sub-15 nm diameters and aspect ratios of 1000 through a water-based high-pressure hydrothermal method in the presence of a tetrabutylammonium dichlorobromide organic salt and glucose reducing agent. In the crystal growth stage, the diameter of the NWs could be controlled by adjusting the pressure, and 15-nm diameter wires were obtained at a pressure of 190 psi. These 2D conductive Ag NW network films showed an excellent optical performance with low haze value of ≤1.0% and 94.5% transmittance at a low sheet resistance of 20 Ω/sq.

Highlights

Flexible transparent conductive films have recently attracted considerable attention for their potential application in various devices such as large-area touch screens, transparent film liquid crystal displays (LCDs), and wearable and flexible photonic devices.[1,2,3,4,5] One of the most widely used transparent conductive materials is indium tin oxide (ITO); its popularity is due to its superior optical properties and low sheet resistance.[6]
As characteristics in the synthetic process of high-pressure hydrothermal method, Ag salts and seed crystals were grown using tetrabutylammonium dichlorobromide (TBA2CB) salts, which are a type of ionic liquid, with silver nitrate, and these Ag seed crystals were reduced by a glucose reducing agent to form Ag NWs
As a result, when cast films composed of sub-15-nm diameter Ag NWs were formed using a conventional wet-coating technique that adhered them to a plastic substrate film, the 2D percolating Ag NW network layers exhibited excellent optical performance levels; they had a very low-haze value (≤1.0%) and 94.5% transmittance, which are performance levels that exceed those of ITO, even at a low sheet resistance of 20 Ω/sq

Summary

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Research Update: Synthesis of sub-15-nm diameter silver nanowires through a water-based hydrothermal method: Fabrication of low-haze 2D conductive films.

INTRODUCTION

RESULTS AND DISCUSSION

CONCLUSION