Ji Tian-Hao, Li Xue-Li, Mao Yongyun, Mei Zhipeng, Tian Yanqing
Science College, Beijing Technology and Business University Beijing 100048 China
Department of Materials Science and Engineering, Southern University of Science and Technology Shenzhen 518055 China
RSC Adv. 2020 Aug 26;10(52):31495-31501. doi: 10.1039/d0ra04958a. eCollection 2020 Aug 21.
Cu-chlorophyllin-bonded carbon dots (CCPh-CDs) have been synthesized at room temperature, and the energy/electron co-transfer behavior between Cu-chlorophyllin molecules (CCPh) and carbon dots (CDs) is investigated various techniques. The mean diameters of CDs and CCPh-CDs are 2.8 nm and 3.1 nm, respectively, measured by HRTEM. The absorption spectra of CCPh-CDs show two parts: the absorptions of CDs and CCPh are in the wavelength range of 300-500 nm. The PL spectra of CCPh-CDs exhibit very weak intensities, and with the decreasing of CCPh content on CDs, the corresponding intensity increases. Luminescent decay spectra show that the PL decay times of CCPh and CCPh-CDs with the highest CCPh content are single-exponentially fitted to be 3.20 ns and 12.64 ns, respectively. Furthermore, based on the electron transfer and reducibility of CCPh-CDs, Ag/AgO nanoparticles with a mean diameter of 10 nm can be easily prepared at room temperature under ultraviolet irradiation. The PL measurement result reveals that both electron transfer and FRET behavior take place from CCPh-CDs to Ag.
在室温下合成了铜叶绿素结合碳点（CCPh-CDs），并通过各种技术研究了铜叶绿素分子（CCPh）与碳点（CDs）之间的能量/电子共转移行为。通过高分辨率透射电子显微镜（HRTEM）测量，CDs和CCPh-CDs的平均直径分别为2.8 nm和3.1 nm。CCPh-CDs的吸收光谱显示出两部分：CDs和CCPh的吸收在300-500 nm波长范围内。CCPh-CDs的光致发光（PL）光谱强度非常弱，并且随着CDs上CCPh含量的降低，相应的强度增加。发光衰减光谱表明，CCPh含量最高的CCPh和CCPh-CDs的PL衰减时间单指数拟合分别为3.20 ns和12.64 ns。此外，基于CCPh-CDs的电子转移和还原性，在室温下紫外光照射下可以轻松制备平均直径为10 nm的Ag/AgO纳米颗粒。PL测量结果表明，电子转移和荧光共振能量转移（FRET）行为均从CCPh-CDs发生到Ag。
