合成了一种新型三取代结构的双光子吸收材料1,3,5-三[4-[2-(噻吩)乙烯基]苯基]苯,通过元素分析、1 H NMR和红外光谱对其进行表征。测试了材料的紫外吸收光谱、单光子荧光光谱和双光子荧光光谱,并测出其双光子吸收截面为426×10-50cm...合成了一种新型三取代结构的双光子吸收材料1,3,5-三[4-[2-(噻吩)乙烯基]苯基]苯,通过元素分析、1 H NMR和红外光谱对其进行表征。测试了材料的紫外吸收光谱、单光子荧光光谱和双光子荧光光谱,并测出其双光子吸收截面为426×10-50cm4·s·photon-1。以1,3,5-三[4-[2-(噻吩)乙烯基]苯基]苯为引发剂,甲基丙烯酸甲酯齐聚物(CN120C80)为单体,飞秒激光器(200fs、76 MHz、Ti∶sapphire)为发光源,进行了三维周期微结构的制作。展开更多
Alkali metal(Li, Na, K) doped ZnO powders were synthesized by solid-state reaction at different calcination temperatures and holding time. Effects of holding time and K sources on the infrared emissivity of ZnO were i...Alkali metal(Li, Na, K) doped ZnO powders were synthesized by solid-state reaction at different calcination temperatures and holding time. Effects of holding time and K sources on the infrared emissivity of ZnO were investigated. The structure and surface morphologies of samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The UV-Vis absorption and infrared emissivities were investigated by a UV-Vis spectrophotometer and an infrared emissometer, respectively. XRD patterns confirm the wurtzite structure of the as prepared samples with single phase. Smooth grain surfaces are detected in all doped ZnO samples, while ZnO:Li and ZnO:Na present the aggregation of grains. The redshifts in the optical band-gap are observed in K-, Na-, and Li-doped ZnO with the values 3.150, 3.144, and 3.142 eV. Due to better crystalline quality, ZnO:K shows a lower emissivity than others. The emissivity of K-doped ZnO decreases to the minimum value(0.804), at 1200 °C and holding 2 h. Compared with KNO3 as K source, K2CO3 doped ZnO has lower emissivities.展开更多
文摘合成了一种新型三取代结构的双光子吸收材料1,3,5-三[4-[2-(噻吩)乙烯基]苯基]苯,通过元素分析、1 H NMR和红外光谱对其进行表征。测试了材料的紫外吸收光谱、单光子荧光光谱和双光子荧光光谱,并测出其双光子吸收截面为426×10-50cm4·s·photon-1。以1,3,5-三[4-[2-(噻吩)乙烯基]苯基]苯为引发剂,甲基丙烯酸甲酯齐聚物(CN120C80)为单体,飞秒激光器(200fs、76 MHz、Ti∶sapphire)为发光源,进行了三维周期微结构的制作。
基金Project(JB141405)supported by the Fundamental Research Funds for the Central Universities of China
文摘Alkali metal(Li, Na, K) doped ZnO powders were synthesized by solid-state reaction at different calcination temperatures and holding time. Effects of holding time and K sources on the infrared emissivity of ZnO were investigated. The structure and surface morphologies of samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The UV-Vis absorption and infrared emissivities were investigated by a UV-Vis spectrophotometer and an infrared emissometer, respectively. XRD patterns confirm the wurtzite structure of the as prepared samples with single phase. Smooth grain surfaces are detected in all doped ZnO samples, while ZnO:Li and ZnO:Na present the aggregation of grains. The redshifts in the optical band-gap are observed in K-, Na-, and Li-doped ZnO with the values 3.150, 3.144, and 3.142 eV. Due to better crystalline quality, ZnO:K shows a lower emissivity than others. The emissivity of K-doped ZnO decreases to the minimum value(0.804), at 1200 °C and holding 2 h. Compared with KNO3 as K source, K2CO3 doped ZnO has lower emissivities.
