Anti-Counterfeiting Tags Using Flexible Substrate with Gradient Micropatterning of Silver Nanowires

Micromachines

Cheolheon Park¹  Wook Park²  Hyeli Kim²  Jungmok You³  Goomin Kwon³ 

[1] Bio-MAX Institute, Seoul National University, Seoul 08826, Korea;Department of Electronic Engineering, Kyung Hee University, Deogyeong-daero, Giheung-gu, Yongin-si 17104, Korea;Department of Plant & Environmental New Resources, Graduate School of Biotechnology, Institute of Life Science and Resources, Kyung Hee University, Deogyeong-daero, Giheung-gu, Yongin-si 17104, Korea;

关键词: gradient pattern;    maskless lithography;    Ag nanowires;    micropattern;    UV dicing tape;    anti-counterfeiting;   

DOI  :  10.3390/mi13020168

来源: DOAJ

【 摘 要 】

Anti-counterfeiting technologies for small products are being developed. We present an anti-counterfeiting tag, a grayscale pattern of silver nanowires (AgNWs) on a flexible substrate. The anti-counterfeiting tag that is observable with a thermal imaging camera was fabricated using the characteristics of silver nanowires with high visible light transmittance and high infrared emissivity. AgNWs were patterned at microscale via a maskless lithography method using UV dicing tape with UV patterns. By attaching and detaching an AgNW coated glass slide and UV dicing tape irradiated with multiple levels of UV, we obtained AgNW patterns with four or more grayscales. Peel tests confirmed that the adhesive strength of the UV dicing tape varied according to the amount of UV irradiation, and electrical resistance and IR image intensity measurements confirmed that the pattern obtained using this tape has multi-level AgNW concentrations. When applied for anti-counterfeiting, the gradient-concentration AgNW micropattern could contain more information than a single-concentration micropattern. In addition, the gradient AgNW micropattern could be transferred to a flexible polymer substrate using a simple method and then attached to various surfaces for use as an anti-counterfeiting tag.

【 授权许可】

Unknown