使用Ln3+的三种模式保护,用于高级安全应用的离子合核心-七头单一纳米晶体
Venkata N K B Adusumalli1, Hyeon Jung Yu1, Yeongchang Goh2
1School of Chemical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea.
ACS applied materials & interfaces
|October 30, 2024
概括
研究人员开发了新的核心-heptad-shell (CHS) 纳米晶体 (NCs) 用于先进的防伪. 这些NC通过向下转移和直角向上转换显示多个排放,从而实现了独特的安全功能.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 摄影化学的使用.
背景情况:
- 开发先进的发光材料对于安全应用至关重要.
- 现有的防伪技术往往缺乏多模式排放能力.
- 纳米晶体为专业应用提供可调节的光学特性.
研究的目的:
- 为了合成新的核心-heptad-shell (CHS) 纳米晶体 (NCs) 具有双向下移和直角向上转换发光.
- 调查这些CHSNC的发光特性,用于防伪应用.
- 用这些NC来展示使用这些NC制造隐形图案和QR码的方法.
主要方法:
- 一层一层的热分解合成CHSNCs.
- 用Ce/Tb或Ce/Eu离子用于特定发光的兴奋剂.
- 用油酸 (OA) 进行表面功能化,并随后用于水性分散的去除.
- 将其纳入碳素甲基纤维素 (CMC) 聚合物,以形成凝.
- 屏幕打印不可见的图案和QR码.
主要成果:
- 合成的OA封顶的CHSNCs通过向下转移和直角向上转换呈现多重排放.
- 在OA移除后,获得了增强的发光强度 (Ce/Tb的21.60倍,Ce/Eu的43.59倍).
- 在不同的激发下成功创建了无形图案和QR码,具有不同的发射颜色.
- 使用可打印发光材料,证明了高水平防伪的潜力.
结论:
- 开发的CHS NC提供了一个多功能平台,用于创建多颜色,多刺激的安全功能.
- 易于合成和表面修饰,使其在防伪方面具有实际应用.
- 这项技术为高级别的产品认证和品牌保护提供了强大的解决方案.
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