个人信息Personal Information
教授
博士生导师
硕士生导师
性别:女
毕业院校:大连理工大学
学位:博士
所在单位:化工学院
学科:应用化学. 精细化工. 有机化学
办公地点:大连市高新区凌工路2号西部校区化工楼E434房间
联系方式:0411-84986265
电子邮箱:zhangshf@dlut.edu.cn
Structurally colored polymer films with narrow stop band, high angle-dependence and good mechanical robustness for trademark anti-counterfeiting
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论文类型:期刊论文
发表时间:2018-08-14
发表刊物:NANOSCALE
收录刊物:SCIE
卷号:10
期号:30
页面范围:14755-14762
ISSN号:2040-3364
摘要:The photonic stop bands of colloidal crystals appear as structural colors, which are potentially useful for display devices, colorimetric sensors, optical filters, paints, and photonic papers. However, low durability and pale colors caused by the undesired scattering of light seriously limit their practical applications. In this article, a polydimethylsiloxane (PDMS)/photonic crystal (PC)/PDMS sandwich structure was designed as a free standing structural colored film with good durability and brilliant color. The monodispersed polystyrene (PS) spheres were self-assembled on the hydrophobic PDMS surface to facilitate the integrity of the assembled structure and then, PDMS with a refractive index of 1.41 was filled in the gaps between the PS spheres (n(PS) = 1.59), replacing air (n(air) = 1). The surface was finally covered with a thin layer of PS PCs, forming a continuous and free standing PC film. The continuous feature of the composite PC can greatly improve their mechanical properties. At the same time, the lower index contrast results in narrow reflection peaks for the composite films, which indicates that higher color purity and brightness could be achieved. Clearly distinguished, vivid structural colors can be observed between red to green or green to blue by tuning the viewing angle from 5 degrees to 50 degrees for films composed of PS spheres with diameters of 247 nm or 209 nm, respectively. They can also be easily patterned by spraying methods and embedded as a trademark on clothes. Patterns with different structural colors at different angle can be clearly be observed under sunlight, which makes them potentially useful as security materials.