School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China; School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China; Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Guangzhou 510006, PR China.
Carbohydr Polym. 2015 Nov 20;133:19-23. doi: 10.1016/j.carbpol.2015.07.017. Epub 2015 Jul 13.
Responsive photo-luminescent soft matters have led to the design of optical sensors and switches. In this research, two new organic-inorganic type hybrid hydrogels have been fabricated by the self-assembly of sodium alginate and lanthanide elements. The incorporation of europium ions (Eu(3+)) (or terbium ions (Tb(3+))) was required for the gelation of the dissolved alginate and thermally stable gels were formed. It has been found that red/green emissions derived from lanthanide ions were clearly identified in pure aqueous media through the metal coordination interactions with assembled alginate. These supramolecular structures could partially prevent the Eu(3+) (or Tb(3+)) from being attacked by high frequency vibrations. More importantly, the lanthanide luminescence could be switched "off-on" in the presence of the anthrax biomarker sodium dipicolinate (NaDPA). The detection limits (for NaDPA) were determined to be 8.3×10(-8)M and 9.0×10(-8)M based on Eu(III) and Tb(III) gel, respectively.
响应型光致发光软物质导致了光学传感器和开关的设计。在这项研究中，通过海藻酸钠和镧系元素的自组装，制备了两种新型的有机-无机型杂化水凝胶。为了使溶解的海藻酸钠凝胶化，需要掺入铕离子(Eu(3+))（或铽离子(Tb(3+)))，并形成热稳定的凝胶。研究发现，通过与组装的海藻酸钠的金属配位相互作用，在纯水溶液中可以清楚地识别出源自镧系离子的红/绿光发射。这些超分子结构可以部分防止Eu(3+)（或Tb(3+))受到高频振动的攻击。更重要的是，在炭疽生物标志物钠二吡啶甲酸（NaDPA）存在的情况下，镧系发光可以“关闭-打开”。基于 Eu(III) 和 Tb(III)凝胶，分别将检测限（针对 NaDPA）确定为 8.3×10(-8)M 和 9.0×10(-8)M。
